SCons 4.4.0

MAN page

The SCons Development Team

Version 4.4.0

Released Sat, 21 Jan 2023 00:00:00 +0000

Name

scons — a software construction tool

Synopsis

scons [options...] [name=val...] [targets...]

DESCRIPTION

scons orchestrates the construction of software (and other tangible products such as documentation files) by determining which component pieces must be built or rebuilt and invoking the necessary commands to build them. SCons offers many features to improve developer productivity such as parallel builds, caching of build artifacts, automatic dependency scanning, and a database of information about previous builds so details do not have to be recalculated each run.

scons requires Python 3.6 or later to run; there should be no other dependencies or requirements. unless the experimental Ninja tool is used. Support for Python 3.5 is removed since SCons 4.3.0. The CPython project has retired 3.5: https://www.python.org/dev/peps/pep-0478.

You set up an SCons build system by writing a script that describes things to build (targets), and, if necessary, the rules to build those files (actions). SCons comes with a collection of Builder methods which apply premade actions for building many common software components such as executable programs, object files and libraries, so that for many software projects, only the targets and input files (sources) need be specified in a call to a builder. SCons thus can operate at a level of abstraction above that of pure filenames. For example if you specify a library target named "foo", SCons keeps track of the actual operating system dependent filename (such as libfoo.so on a GNU/Linux system), and how to refer to that library in later construction steps that want to use it, so you don't have to specify that precise information yourself. SCons can also scan automatically for dependency information, such as header files included by source code files (for example, #include preprocessor directives in C or C++ files), so these implicit dependencies do not have to be specified manually. SCons supports the ability to define new scanners to support additional input file types.

Information about files involved in the build, including a cryptographic hash of the contents, is cached for later reuse. By default this hash (the content signature) is used to determine if a file has changed since the last build, but this can be controlled by selecting an appropriate Decider function. Implicit dependency files are also part of out-of-date computation. The scanned implicit dependency information can optionally be cached and used to speed up future builds. A hash of each executed build action (the build signature is cached, so that changes to build instructions (changing flags, etc.) or to the build tools themselves (new version) can also trigger a rebuild.

When invoked, scons looks for a file named SConstruct in the current directory and reads the build configuration from that file (other names are allowed, see the section called “SConscript Files” for more information). The SConstruct file may specify subsidiary configuration files by calling the SConscript function. By convention, these subsidiary files are named SConscript, although any name may be used. As a result of this naming convention, the term SConscript files is used to refer generically to the complete set of configuration files for a project (including the SConstruct file), regardless of the actual file names or number of such files.

Before reading the SConscript files, scons looks for a directory named site_scons in various system directories and in the directory containing the SConstruct file or, if specified, the directory from the --site-dir option instead, and prepends the ones it finds to the Python module search path (sys.path), thus allowing modules in such directories to be imported in the normal Python way in SConscript files. For each found site directory, (1) if it contains a file site_init.py that file is evaluated, and (2) if it contains a directory site_tools the path to that directory is prepended to the default toolpath. See the --site-dir and --no-site-dir options for details on default paths and controlling the site directories.

SConscript files are written in the Python programming language, although it is normally not necessary to be a Python programmer to use scons effectively. SConscript files are invoked in a context that makes the facilities described in this manual page available in their local namespace without any special steps. Standard Python scripting capabilities such as flow control, data manipulation, and imported Python libraries are available to use to handle complicated build situations. Other Python files can be made a part of the build system, but they do not automatically have the SCons context and need to import it if they need access (described later).

scons reads and executes all of the included SConscript files before it begins building any targets. To make this clear, scons prints the following messages about what it is doing:

$ scons foo.out
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets  ...
cp foo.in foo.out
scons: done building targets.
$

The status messages (lines beginning with the scons: tag) may be suppressed using the -Q option.

To assure reproducible builds, SCons uses a restricted execution environment for running external commands used to build targets, rather then propagating the full environment in effect at the time scons was called. This helps avoid problems like picking up accidental settings, temporary debug values that are no longer needed, or one developer having different settings than another (or than the CI/CD pipeline). Environment variables that are needed for proper operation of such commands need to be set explicitly, which can be done either by assigning the desired values, or by picking values individually out of environment variables using the Python os.environ dictionary. The execution environment for a given construction environment is contained in its $ENV construction variable. A few environment variables are picked up automatically - see the section called “ENVIRONMENT”).

In particular, if the compiler or other commands that you want to use to build your target files are not in standard system locations, scons will not find them unless you explicitly include the locations into the PATH element of the execution environment. One example approach is to extract the entire PATH environment variable and set that into the execution environment:

import os
env = Environment(ENV={'PATH': os.environ['PATH']})

Similarly, if the commands use specific external environment variables that scons does not recognize, they can be propagated into the execution environment:

import os

env = Environment(
    ENV={
        'PATH': os.environ['PATH'],
        'ANDROID_HOME': os.environ['ANDROID_HOME'],
        'ANDROID_NDK_HOME': os.environ['ANDROID_NDK_HOME'],
    }
)

Or you may explicitly propagate the invoking user's complete external environment:

import os
env = Environment(ENV=os.environ.copy())

This comes at the expense of making your build dependent on the user's environment being set correctly, but it may be more convenient for many configurations. It should not cause problems if done in a build setup which tightly controls how the environment is set up before invoking scons, as in many continuous integration setups.

scons is normally executed in a top-level directory containing an SConstruct file. When scons is invoked, the command line (including the contents of the SCONSFLAGS environment variable, if set) is processed. Command-line options (see the section called “OPTIONS”) are consumed. Any variable argument assignments are collected, and remaining arguments are taken as targets to build.

Values of variables to be passed to the SConscript files may be specified on the command line:

scons debug=1

These variables are available through the ARGUMENTS dictionary, and can be used in the SConscript files to modify the build in any way:

if ARGUMENTS.get('debug', 0):
    env = Environment(CCFLAGS='-g')
else:
    env = Environment()

The command-line variable arguments are also available in the ARGLIST list, indexed by their order on the command line. This allows you to process them in order rather than by name, if necessary. Each ARGLIST entry is a tuple containing (argname, argvalue).

See the section called “Command-Line Construction Variables” for more information.

scons can maintain a cache of target (derived) files that can be shared between multiple builds. When derived-file caching is enabled in an SConscript file, any target files built by scons will be copied to the cache. If an up-to-date target file is found in the cache, it will be retrieved from the cache instead of being rebuilt locally. Caching behavior may be disabled and controlled in other ways by the --cache-force, --cache-disable, --cache-readonly, and --cache-show command-line options. The --random option is useful to prevent multiple builds from trying to update the cache simultaneously.

By default, scons searches for known programming tools on various systems and initializes itself based on what is found. On Windows systems which identify as win32, scons searches in order for the Microsoft Visual C++ tools, the MinGW tool chain, the Intel compiler tools, and the PharLap ETS compiler. On Windows system which identify as cygwin (that is, if scons is invoked from a cygwin shell), the order changes to prefer the GCC toolchain over the MSVC tools. On OS/2 systems, scons searches in order for the OS/2 compiler, the GCC tool chain, and the Microsoft Visual C++ tools, On SGI IRIX, IBM AIX, Hewlett Packard HP-UX, and Oracle Solaris systems, scons searches for the native compiler tools (MIPSpro, Visual Age, aCC, and Forte tools respectively) and the GCC tool chain. On all other platforms, including POSIX (Linux and UNIX) platforms, scons searches in order for the GCC tool chain, and the Intel compiler tools. These default values may be overridden by appropriate setting of construction variables.

Target Selection

SCons acts on the selected targets, whether the requested operation is build, no-exec or clean. Targets are selected as follows:

Targets specified on the command line. These may be files, directories, or phony targets defined using the Alias function. Directory targets are scanned by scons for any targets that may be found with a destination in or under that directory. The targets listed on the command line are made available in the COMMAND_LINE_TARGETS list.
If no targets are specified on the command line, scons will select those targets specified in the SConscript files via calls to the Default function. These are known as the default targets, and are made available in the DEFAULT_TARGETS list.
If no targets are selected by the previous steps, scons selects the current directory for scanning, unless command-line options which affect the target scan are detected (-C, -D, -u, -U). Since targets thus selected were not the result of user instructions, this target list is not made available for direct inspection; use the --debug=explain option if they need to be examined.
scons always adds to the selected targets any intermediate targets which are necessary to build the specified ones. For example, if constructing a shared library or dll from C source files, scons will also build the object files which will make up the library.

To ignore the default targets specified through calls to Default and instead build all target files in or below the current directory specify the current directory (.) as a command-line target:

scons .

To build all target files, including any files outside of the current directory, supply a command-line target of the root directory (on POSIX systems):

scons /

or the path name(s) of the volume(s) in which all the targets should be built (on Windows systems):

scons C:\ D:\

A subset of a hierarchical tree may be built by remaining at the top-level directory (where the SConstruct file lives) and specifying the subdirectory as the target to build:

scons src/subdir

or by changing directory and invoking scons with the -u option, which traverses up the directory hierarchy until it finds the SConstruct file, and then builds targets relatively to the current subdirectory (see also the related -D and -U options):

cd src/subdir
scons -u .

In all cases, more files may be built than are requested, as scons needs to make sure any dependent files are built.

Specifying "cleanup" targets in SConscript files is usually not necessary. The -c flag removes all selected targets:

scons -c .

to remove all target files in or under the current directory, or:

scons -c build export

to remove target files under build and export.

Additional files or directories to remove can be specified using the Clean function in the SConscript files. Conversely, targets that would normally be removed by the -c invocation can be retained by calling the NoClean function with those targets.

scons supports building multiple targets in parallel via a -j option that takes, as its argument, the number of simultaneous tasks that may be spawned:

scons -j 4

builds four targets in parallel, for example.

OPTIONS

In general, scons supports the same command-line options as GNU Make and many of those supported by cons.

-b

Ignored for compatibility with non-GNU versions of Make

-c, --clean, --remove

Set clean mode. Clean up by removing the selected targets, well as any files or directories associated with a selected target through calls to the Clean function. Will not remove any targets which are marked for preservation through calls to the NoClean function.

While clean mode removes targets rather than building them, work which is done directly in Python code in SConscript files will still be carried out. If it is important to avoid some such work from taking place in clean mode, it should be protected. An SConscript file can determine which mode is active by querying GetOption, as in the call if GetOption("clean"):

--cache-debug=file

Write debug information about derived-file caching to the specified file. If file is a hyphen (-), the debug information is printed to the standard output. The printed messages describe what signature-file names are being looked for in, retrieved from, or written to the derived-file cache specified by CacheDir.

--cache-disable, --no-cache

Disable derived-file caching. scons will neither retrieve files from the cache nor copy files to the cache. This option can be used to temporarily disable the cache without modifying the build scripts.

--cache-force, --cache-populate

When using CacheDir, populate a derived-file cache by copying any already-existing, up-to-date derived files to the cache, in addition to files built by this invocation. This is useful to populate a new cache with all the current derived files, or to add to the cache any derived files recently built with caching disabled via the --cache-disable option.

--cache-readonly

Use the derived-file cache, if enabled, to retrieve files, but do not not update the cache with any files actually built during this invocation.

--cache-show

When using a derived-file cache show the command that would have been executed to build the file (or the corresponding *COMSTR contents if set) even if the file is retrieved from cache. Without this option, scons shows a cache retrieval message if the file is fetched from cache. This allows producing consistent output for build logs, regardless of whether a target file was rebuilt or retrieved from the cache.

--config=mode

Control how the Configure call should use or generate the results of configuration tests. mode should be one of the following choices:

auto: SCons will use its normal dependency mechanisms to decide if a test must be rebuilt or not. This saves time by not running the same configuration tests every time you invoke scons, but will overlook changes in system header files or external commands (such as compilers) if you don't specify those dependecies explicitly. This is the default behavior.
force: If this mode is specified, all configuration tests will be re-run regardless of whether the cached results are out of date. This can be used to explicitly force the configuration tests to be updated in response to an otherwise unconfigured change in a system header file or compiler.
cache: If this mode is specified, no configuration tests will be rerun and all results will be taken from cache. scons will report an error if --config=cache is specified and a necessary test does not have any results in the cache.

-C directory, --directory=directory

Run as if scons was started in directory instead of the current working directory. That is, change directory before searching for the SConstruct, Sconstruct, sconstruct, SConstruct.py, Sconstruct.py or sconstruct.py file or doing anything else. When multiple -C options are given, each subsequent non-absolute -C directory is interpreted relative to the preceding one. This option is similar to using -f directory/SConstruct, but -f does not search for any of the predefined SConstruct names in the specified directory. See also options -u, -U and -D to change the SConstruct search behavior when this option is used.

-D

Works exactly the same way as the -u option except for the way default targets are handled. When this option is used and no targets are specified on the command line, all default targets are built, whether or not they are below the current directory.

--debug=type[,type...]

Debug the build process. type specifies the kind of debugging info to emit. Multiple types may be specified, separated by commas. The following types are recognized:

action-timestamps

Prints additional time profiling information. For each command, shows the absolute start and end times. This may be useful in debugging parallel builds. Implies the --debug=time option.

Available since scons 3.1.

count

Print how many objects are created of the various classes used internally by SCons before and after reading the SConscript files and before and after building targets. This is not supported when SCons is executed with the Python -O (optimized) option or when the SCons modules have been compiled with optimization (that is, when executing from *.pyo files).

duplicate

Print a line for each unlink/relink (or copy) of a variant file from its source file. Includes debugging info for unlinking stale variant files, as well as unlinking old targets before building them.

explain

Print an explanation of why scons is deciding to (re-)build the targets it selects for building.

findlibs

Instruct the scanner that searches for libraries to print a message about each potential library name it is searching for, and about the actual libraries it finds.

includes

Print the include tree after each top-level target is built. This is generally used to find out what files are included by the sources of a given derived file:

$ scons --debug=includes foo.o

memoizer

Prints a summary of hits and misses using the Memoizer, an internal subsystem that counts how often SCons uses cached values in memory instead of recomputing them each time they're needed.

memory

Prints how much memory SCons uses before and after reading the SConscript files and before and after building targets.

objects

Prints a list of the various objects of the various classes used internally by SCons.

pdb

Re-run scons under the control of the pdb Python debugger.

prepare

Print a line each time any target (internal or external) is prepared for building. scons prints this for each target it considers, even if that target is up to date (see also --debug=explain). This can help debug problems with targets that aren't being built; it shows whether scons is at least considering them or not.

presub

Print the raw command line used to build each target before the construction environment variables are substituted. Also shows which targets are being built by this command. Output looks something like this:

$ scons --debug=presub
Building myprog.o with action(s):
  $SHCC $SHCFLAGS $SHCCFLAGS $CPPFLAGS $_CPPINCFLAGS -c -o $TARGET $SOURCES
...

stacktrace

Prints an internal Python stack trace when encountering an otherwise unexplained error.

time

Prints various time profiling information:

The time spent executing each individual build command
The total build time (time SCons ran from beginning to end)
The total time spent reading and executing SConscript files
The total time SCons itself spent running (that is, not counting reading and executing SConscript files)
The total time spent executing all build commands
The elapsed wall-clock time spent executing those build commands
The time spent processing each file passed to the SConscript function

(When scons is executed without the -j option, the elapsed wall-clock time will typically be slightly longer than the total time spent executing all the build commands, due to the SCons processing that takes place in between executing each command. When scons is executed with the -j option, and your build configuration allows good parallelization, the elapsed wall-clock time should be significantly smaller than the total time spent executing all the build commands, since multiple build commands and intervening SCons processing should take place in parallel.)

--diskcheck=type

Enable specific checks for whether or not there is a file on disk where the SCons configuration expects a directory (or vice versa) when searching for source and include files. type can be an available diskcheck type or the special tokens all or none. A comma-separated string can be used to select multiple checks. The default setting is all.

Current available checks are:

match: to check that files and directories on disk match SCons' expected configuration.

Disabling some or all of these checks can provide a performance boost for large configurations, or when the configuration will check for files and/or directories across networked or shared file systems, at the slight increased risk of an incorrect build or of not handling errors gracefully.

--duplicate=ORDER

There are three ways to duplicate files in a build tree: hard links, soft (symbolic) links and copies. The default policy is to prefer hard links to soft links to copies. You can specify a different policy with this option. ORDER must be one of hard-soft-copy (the default), soft-hard-copy, hard-copy, soft-copy or copy. SCons will attempt to duplicate files using the mechanisms in the specified order.

--enable-virtualenv

Import virtualenv-related variables to SCons.

--experimental=feature

Enable experimental features and/or tools. feature can be an available feature name or the special tokens all or none. A comma-separated string can be used to select multiple features. The default setting is none.

Current available features are: ninja.

Caution

No Support offered for any features or tools enabled by this flag.

Available since scons 4.2.

-f file, --file=file, --makefile=file, --sconstruct=file

Use file as the initial SConscript file. Multiple -f options may be specified, in which case scons will read all of the specified files.

-h, --help

Print a local help message for this project, if one is defined in the SConscript files (see the Help function), plus a line that refers to the standard SCons help message. If no local help message is defined, prints the standard SCons help message (as for the -H option) plus help for any local options defined through AddOption. Exits after displaying the appropriate message.

Note that use of this option requires SCons to process the SConscript files, so syntax errors may cause the help message not to be displayed.

--hash-chunksize=KILOBYTES

Set the block size used when computing content signatures to KILOBYTES. This value determines the size of the chunks which are read in at once when computing signature hashes. Files below that size are fully stored in memory before performing the signature computation while bigger files are read in block-by-block. A huge block-size leads to high memory consumption while a very small block-size slows down the build considerably.

The default value is to use a chunk size of 64 kilobytes, which should be appropriate for most uses.

Available since scons 4.2.

--hash-format=ALGORITHM

Set the hashing algorithm used by SCons to ALGORITHM. This value determines the hashing algorithm used in generating content signatures or CacheDir keys.

The supported list of values are: md5, sha1, and sha256. However, the Python interpreter used to run SCons must have the corresponding support available in the hashlib module to use the specified algorithm.

Specifying this value changes the name of the SConsign database. For example, --hash-format=sha256 will create a SConsign database with name .sconsign_sha256.dblite.

If this option is not specified, a the first supported hash format found is selected. Typically this is MD5, however, if you are on a FIPS-compliant system and using a version of Python less than 3.9, SHA1 or SHA256 will be chosen as the default. Python 3.9 and onwards clients will always default to MD5, even in FIPS mode, unless otherwise specified with the --hash-format option.

For MD5 databases (either explicitly specified with --hash-format=md5 or defaulted), the SConsign database is.sconsign.dblite. The newer SHA1 and SHA256 selections meanwhile store their databases to .sconsign_algorithmname.dblite

Available since scons 4.2.

-H, --help-options

Print the standard help message about SCons command-line options and exit.

-i, --ignore-errors

Ignore all errors from commands executed to rebuild files.

-I directory, --include-dir=directory

Specifies a directory to search for imported Python modules. If several -I options are used, the directories are searched in the order specified.

--ignore-virtualenv

Suppress importing virtualenv-related variables to SCons.

--implicit-cache

Cache implicit dependencies. This causes scons to use the implicit (scanned) dependencies from the last time it was run instead of scanning the files for implicit dependencies. This can significantly speed up SCons, but with the following limitations:

scons will not detect changes to implicit dependency search paths (e.g. $CPPPATH, $LIBPATH) that would ordinarily cause different versions of same-named files to be used.

scons will miss changes in the implicit dependencies in cases where a new implicit dependency is added earlier in the implicit dependency search path (e.g. $CPPPATH, $LIBPATH) than a current implicit dependency with the same name.

--implicit-deps-changed

Forces SCons to ignore the cached implicit dependencies. This causes the implicit dependencies to be rescanned and recached. This implies --implicit-cache.

--implicit-deps-unchanged

Force SCons to ignore changes in the implicit dependencies. This causes cached implicit dependencies to always be used. This implies --implicit-cache.

--install-sandbox=sandbox_path

When using the Install builders, prepend sandbox_path to the installation paths such that all installed files will be placed under that directory. This option is unavailable if one of Install, InstallAs or InstallVersionedLib is not used in the SConscript files.

--interactive

Starts SCons in interactive mode. The SConscript files are read once and a scons>>> prompt is printed. Targets may now be rebuilt by typing commands at interactive prompt without having to re-read the SConscript files and re-initialize the dependency graph from scratch.

SCons interactive mode supports the following commands:

build [OPTIONS] [TARGETS] ...

Builds the specified TARGETS (and their dependencies) with the specified SCons command-line OPTIONS. b and scons are synonyms for build.

The following SCons command-line options affect the build command:

--cache-debug=FILE
--cache-disable, --no-cache
--cache-force, --cache-populate
--cache-readonly
--cache-show
--debug=TYPE
-i, --ignore-errors
-j N, --jobs=N
-k, --keep-going
-n, --no-exec, --just-print, --dry-run, --recon
-Q
-s, --silent, --quiet
--taskmastertrace=FILE
--tree=OPTIONS

Any other SCons command-line options that are specified do not cause errors but have no effect on the build command (mainly because they affect how the SConscript files are read, which only happens once at the beginning of interactive mode).

clean [OPTIONS] [TARGETS] ...

Cleans the specified TARGETS (and their dependencies) with the specified OPTIONS. c is a synonym. This command is itself a synonym for build --clean

exit

Exits SCons interactive mode. You can also exit by terminating input (Ctrl+D UNIX or Linux systems, (Ctrl+Z on Windows systems).

help [COMMAND]

Provides a help message about the commands available in SCons interactive mode. If COMMAND is specified, h and ? are synonyms.

shell [COMMANDLINE]

Executes the specified COMMANDLINE in a subshell. If no COMMANDLINE is specified, executes the interactive command interpreter specified in the SHELL environment variable (on UNIX and Linux systems) or the COMSPEC environment variable (on Windows systems). sh and ! are synonyms.

version

Prints SCons version information.

An empty line repeats the last typed command. Command-line editing can be used if the readline module is available.

$ scons --interactive
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons>>> build -n prog
scons>>> exit

-j N, --jobs=N

Specifies the maximum number of comcurrent jobs (commands) to run. If there is more than one -j option, the last one is effective.

-k, --keep-going

Continue as much as possible after an error. The target that failed and those that depend on it will not be remade, but other targets specified on the command line will still be processed.

-m

Ignored for compatibility with non-GNU versions of Make.

--max-drift=SECONDS

Set the maximum expected drift in the modification time of files to SECONDS. This value determines how long a file must be unmodified before its cached content signature will be used instead of calculating a new content signature (hash) of the file's contents. The default value is 2 days, which means a file must have a modification time of at least two days ago in order to have its cached content signature used. A negative value means to never cache the content signature and to ignore the cached value if there already is one. A value of 0 means to always use the cached signature, no matter how old the file is.

--md5-chunksize=KILOBYTES

A deprecated synonym for --hash-chunksize.

Deprecated since scons 4.2.

-n, --no-exec, --just-print, --dry-run, --recon

Set no execute mode. Print the commands that would be executed to build any out-of-date target files, but do not execute the commands.

The output is a best effort, as SCons cannot always precisely determine what would be built. For example, if a file is generated by a builder action that is later used in the build, that file is not available to scan for dependencies on an unbuilt tree, or may contain out of date information in a built tree.

Work which is done directly in Python code in SConscript files, as opposed to work done by builder actions during the build phase, will still be carried out. If it is important to avoid some such work from taking place in no execute mode, it should be protected. An SConscript file can determine which mode is active by querying GetOption, as in the call if GetOption("no_exec"):

--no-site-dir

Prevents the automatic addition of the standard site_scons dirs to sys.path. Also prevents loading the site_scons/site_init.py modules if they exist, and prevents adding their site_scons/site_tools dirs to the toolpath.

--package-type=type

The type or types of package to create when using the Package builder. In the case of multiple types, type should be a comma-separated string; SCons will try to build for all of those packages. Note this option is only available if the packaging tool has been enabled.

--profile=file

Run SCons under the Python profiler and save the results in the specified file. The results may be analyzed using the Python pstats module.

-q, --question

Do not run any commands, or print anything. Just return an exit status that is zero if the specified targets are already up to date, non-zero otherwise.

-Q

Quiets SCons status messages about reading SConscript files, building targets and entering directories. Commands that are executed to rebuild target files are still printed.

--random

Build dependencies in a random order. This is useful when building multiple trees simultaneously with caching enabled, to prevent multiple builds from simultaneously trying to build or retrieve the same target files.

-s, --silent, --quiet

Silent. Do not print commands that are executed to rebuild target files. Also suppresses SCons status messages.

-S, --no-keep-going, --stop

Ignored for compatibility with GNU Make

--site-dir=path

Use a specific path as the site directory rather than searching the list of default site directories. This directory will be prepended to sys.path, the module path/site_init.py will be loaded if it exists, and path/site_tools will be added to the default toolpath.

The default set of site directories searched when --site-dir is not specified depends on the system platform, as follows. Users or system administrators can tune site-specific or project-specific SCons behavior by setting up a site directory in one or more of these locations. Directories are examined in the order given, from most generic ("system" directories) to most specific (in the current project), so the last-executed site_init.py file is the most specific one, giving it the chance to override everything else), and the directories are prepended to the paths, again so the last directory examined comes first in the resulting path.

Windows:

%ALLUSERSPROFILE%/scons/site_scons
%LOCALAPPDATA%/scons/site_scons
%APPDATA%/scons/site_scons
%USERPROFILE%/.scons/site_scons
./site_scons

Note earlier versions of the documentation listed a different path for the "system" site directory, this path is still checked but its use is discouraged:

%ALLUSERSPROFILE%/Application Data/scons/site_scons

Mac OS X:

/Library/Application Support/SCons/site_scons
/opt/local/share/scons/site_scons (for MacPorts)
/sw/share/scons/site_scons (for Fink)
$HOME/Library/Application Support/SCons/site_scons
$HOME/.scons/site_scons
./site_scons

Solaris:

/opt/sfw/scons/site_scons
/usr/share/scons/site_scons
$HOME/.scons/site_scons
./site_scons

Linux, HPUX, and other Posix-like systems:

/usr/share/scons/site_scons
$HOME/.scons/site_scons
./site_scons

--stack-size=KILOBYTES

Set the size stack used to run threads to KILOBYTES. This value determines the stack size of the threads used to run jobs. These threads execute the actions of the builders for the nodes that are out-of-date. This option has no effect unless the number of concurrent build jobs is larger than one (as set by -j N or --jobs=N on the command line or SetOption in a script).

Using a stack size that is too small may cause stack overflow errors. This usually shows up as segmentation faults that cause scons to abort before building anything. Using a stack size that is too large will cause scons to use more memory than required and may slow down the entire build process. The default value is to use a stack size of 256 kilobytes, which should be appropriate for most uses. You should not need to increase this value unless you encounter stack overflow errors.

-t, --touch

Ignored for compatibility with GNU Make. (Touching a file to make it appear up-to-date is unnecessary when using scons.)

--taskmastertrace=file

Prints trace information to the specified file about how the internal Taskmaster object evaluates and controls the order in which Nodes are built. A file name of - may be used to specify the standard output.

--tree=type[,type...]

Prints a tree of the dependencies after each top-level target is built. This prints out some or all of the tree, in various formats, depending on the type specified:

all

Print the entire dependency tree after each top-level target is built. This prints out the complete dependency tree, including implicit dependencies and ignored dependencies.

derived

Restricts the tree output to only derived (target) files, not source files.

linedraw

Draw the tree output using Unicode line-drawing characters instead of plain ASCII text. This option acts as a modifier to the selected type(s). If specified alone, without any type, it behaves as if all had been specified.

Available since scons 4.0.

status

Prints status information for each displayed node.

prune

Prunes the tree to avoid repeating dependency information for nodes that have already been displayed. Any node that has already been displayed will have its name printed in [square brackets], as an indication that the dependencies for that node can be found by searching for the relevant output higher up in the tree.

Multiple type choices may be specified, separated by commas:

# Prints only derived files, with status information:
scons --tree=derived,status

# Prints all dependencies of target, with status information
# and pruning dependencies of already-visited Nodes:
scons --tree=all,prune,status target

-u, --up, --search-up

Walks up the directory structure until an SConstruct, Sconstruct, sconstruct, SConstruct.py, Sconstruct.py or sconstruct.py file is found, and uses that as the top of the directory tree. If no targets are specified on the command line, only targets at or below the current directory will be built.

-U

Works exactly the same way as the -u option except for the way default targets are handled. When this option is used and no targets are specified on the command line, all default targets that are defined in the SConscript(s) in the current directory are built, regardless of what directory the resultant targets end up in.

-v, --version

Print the scons version, copyright information, list of authors, and any other relevant information. Then exit.

-w, --print-directory

Print a message containing the working directory before and after other processing.

--no-print-directory

Turn off -w, even if it was turned on implicitly.

--warn=type, --warn=no-type

Enable or disable (with the prefix "no-") warnings (--warning is a synonym). type specifies the type of warnings to be enabled or disabled:

all: All warnings.
cache-version

-Y repository, --repository=repository, --srcdir=repository

Search the specified repository for any input and target files not found in the local directory hierarchy. Multiple -Y options may be specified, in which case the repositories are searched in the order specified.

SCONSCRIPT FILE REFERENCE

SConscript Files

The build configuration is described by one or more files, known as SConscript files. There must be at least one file for a valid build (scons will quit if it does not find one). scons by default looks for this file by the name SConstruct in the directory from which you run scons, though if necessary, also looks for alternative file names Sconstruct, sconstruct, SConstruct.py, Sconstruct.py and sconstruct.py in that order. A different file name (which can include a pathname part) may be specified via the -f option. Except for the SConstruct file, these files are not searched for automatically; you add additional configuration files to the build by calling the SConscript function. This allows parts of the build to be conditionally included or excluded at run-time depending on how scons is invoked.

Each SConscript file in a build configuration is invoked independently in a separate context. This provides necessary isolation so that different parts of the build don't accidentally step on each other. You have to be explicit about sharing information, by using the Export function or the exports argument to the SConscript function, as well as the Return function in a called SConscript file, and comsume shared information by using the Import function.

The following sections describe the various SCons facilities that can be used in SConscript files. Quick links:

Construction Environments

Tools

Builder Methods

Methods and Functions to do Things

SConscript Variables

Construction Variables

Configure Contexts

Command-Line Construction Variables

Node Objects

Construction Environments

A Construction Environment is the basic means by which you communicate build information to SCons. A new construction environment is created using the Environment function:

env = Environment()

Construction environment attributes called Construction Variables may be set either by specifying them as keyword arguments when the object is created or by assigning them a value after the object is created. These two are nominally equivalent:

env = Environment(FOO='foo')
env['FOO'] = 'foo'

Note that certain settings which affect tool detection are referenced only when the tools are initializided, so you either need either to supply them as part of the call to Environment, or defer tool initialization. For example, initializing the Microsoft Visual C++ version you wish to use:

# initializes msvc to v14.1
env = Environment(MSVC_VERSION="14.1")

env = Environment()
# msvc tool was initialized to default, does not reinitialize
env['MSVC_VERSION'] = "14.1"

env = Environment(tools=[])
env['MSVC_VERSION'] = "14.1"
# msvc tool initialization was deferred, so will pick up new value
env.Tool('default')

As a convenience, construction variables may also be set or modified by the parse_flags keyword argument during object creation, which has the effect of the env.MergeFlags method being applied to the argument value after all other processing is completed. This is useful either if the exact content of the flags is unknown (for example, read from a control file) or if the flags need to be distributed to a number of construction variables. env.ParseFlags describes how these arguments are distributed to construction variables.

env = Environment(parse_flags='-Iinclude -DEBUG -lm')

This example adds 'include' to the $CPPPATH construction variable, 'EBUG' to $CPPDEFINES, and 'm' to $LIBS.

An existing construction environment can be duplicated by calling the env.Clone method. Without arguments, it will be a copy with the same settings. Otherwise, env.Clone takes the same arguments as Environment, and uses the arguments to create a modified copy.

SCons provides a special construction environment called the Default Environment. The default environment is used only for global functions, that is, construction activities called without the context of a regular construction environment. See DefaultEnvironment for more information.

By default, a new construction environment is initialized with a set of builder methods and construction variables that are appropriate for the current platform. The optional platform keyword argument may be used to specify that the construction environment should be initialized for a different platform:

env = Environment(platform='cygwin')

Specifying a platform initializes the appropriate construction variables in the environment to use and generate file names with prefixes and suffixes appropriate for that platform.

Note that the win32 platform adds the SystemDrive and SystemRoot variables from the user's external environment to the construction environment's ENV dictionary. This is so that any executed commands that use sockets to connect with other systems will work on Windows systems.

The platform argument may be a string value representing one of the pre-defined platforms (aix, cygwin, darwin, hpux, irix, os2, posix, sunos or win32), or it may be be a callable platform object returned by a call to Platform selecting a pre-defined platform, or it may be a user-supplied callable, in which case the Environment method will call it to update the new construction environment:

def my_platform(env):
    env['VAR'] = 'xyzzy'

env = Environment(platform=my_platform)

Note that supplying a non-default platform or custom fuction for initialization may bypass settings that should happen for the host system and should be used with care. It is most useful in the case where the platform is an alternative for the one that would be auto-detected, such as platform="cygwin" on a system which would otherwise identify as win32.

The optional tools and toolpath keyword arguments affect the way tools available to the environment are initialized. See the section called “Tools” for details.

The optional variables keyword argument allows passing a Variables object which will be used in the initialization of the construction environment See the section called “Command-Line Construction Variables” for details.

Tools

SCons has a large number of predefined tool modules (more properly, tool specification modules) which are used to help initialize the construction environment. An SCons tool is only responsible for setup. For example, if an SConscript file declares the need to construct an object file from a C-language source file by calling the Object builder, then a tool representing an available C compiler needs to have run first, to set up that builder and all the construction variables it needs in the associated construction environment; the tool itself is not called in the process of the build. Normally this happens invisibly as scons has per-platform lists of default tools, and it steps through those tools, calling the ones which are actually applicable, skipping those where necessary programs are not installed on the build system, or other preconditions are not met.

A specific set of tools with which to initialize an environment when creating it may be specified using the optional keyword argument tools, which takes a list of tool names. This is useful to override the defaults, to specify non-default built-in tools, and to supply added tools:

env = Environment(tools=['msvc', 'lex'])

Tools can also be directly called by using the Tool method (see below).

The tools argument overrides the default tool list, it does not add to it, so be sure to include all the tools you need. For example if you are building a c/c++ program you must specify a tool for at least a compiler and a linker, as in tools=['clang', 'link']. The tool name 'default' can be used to retain the default list.

If no tools argument is specified, or if tools includes 'default', then scons will auto-detect usable tools, using the execution environment value of PATH (that is, env['ENV']['PATH'] - the external evironment PATH from os.environ is not used) for looking up any backing programs, and the platform name in effect to determine the default tools for that platform. Changing the PATH variable after the construction environment is constructed will not cause the tools to be re-detected.

Additional tools can be added, see the Extending SCons section and specifically Tool Modules.

SCons supports the following tool specifications out of the box:

386asm

Sets construction variables for the 386ASM assembler for the Phar Lap ETS embedded operating system.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $CC, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

aixc++

Sets construction variables for the IMB xlc / Visual Age C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXX, $SHOBJSUFFIX.

aixcc

Sets construction variables for the IBM xlc / Visual Age C compiler.

Sets: $CC, $CCVERSION, $SHCC.

aixf77

Sets construction variables for the IBM Visual Age f77 Fortran compiler.

Sets: $F77, $SHF77.

aixlink

Sets construction variables for the IBM Visual Age linker.

Sets: $LINKFLAGS, $SHLIBSUFFIX, $SHLINKFLAGS.

applelink

Sets construction variables for the Apple linker (similar to the GNU linker).

Sets: $APPLELINK_COMPATIBILITY_VERSION, $APPLELINK_CURRENT_VERSION, $APPLELINK_NO_COMPATIBILITY_VERSION, $APPLELINK_NO_CURRENT_VERSION, $FRAMEWORKPATHPREFIX, $LDMODULECOM, $LDMODULEFLAGS, $LDMODULEPREFIX, $LDMODULESUFFIX, $LINKCOM, $SHLINKCOM, $SHLINKFLAGS, $_APPLELINK_COMPATIBILITY_VERSION, $_APPLELINK_CURRENT_VERSION, $_FRAMEWORKPATH, $_FRAMEWORKS.

Uses: $FRAMEWORKSFLAGS.

ar

Sets construction variables for the ar library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX, $RANLIB, $RANLIBCOM, $RANLIBFLAGS.

as

Sets construction variables for the as assembler.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $CC, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

bcc32

Sets construction variables for the bcc32 compiler.

Sets: $CC, $CCCOM, $CCFLAGS, $CFILESUFFIX, $CFLAGS, $CPPDEFPREFIX, $CPPDEFSUFFIX, $INCPREFIX, $INCSUFFIX, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHOBJSUFFIX.

Uses: $_CPPDEFFLAGS, $_CPPINCFLAGS.

cc

Sets construction variables for generic POSIX C compilers.

Sets: $CC, $CCCOM, $CCDEPFLAGS, $CCFLAGS, $CFILESUFFIX, $CFLAGS, $CPPDEFPREFIX, $CPPDEFSUFFIX, $FRAMEWORKPATH, $FRAMEWORKS, $INCPREFIX, $INCSUFFIX, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHOBJSUFFIX.

Uses: $CCCOMSTR, $PLATFORM, $SHCCCOMSTR.

clang

Set construction variables for the Clang C compiler.

Sets: $CC, $CCDEPFLAGS, $CCVERSION, $SHCCFLAGS.

clangxx

Set construction variables for the Clang C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXXFLAGS, $SHOBJSUFFIX, $STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME.

compilation_db

Sets up CompilationDatabase builder which generates a clang tooling compatible compilation database.

Sets: $COMPILATIONDB_COMSTR, $COMPILATIONDB_PATH_FILTER, $COMPILATIONDB_USE_ABSPATH.

cvf

Sets construction variables for the Compaq Visual Fortran compiler.

Sets: $FORTRAN, $FORTRANCOM, $FORTRANMODDIR, $FORTRANMODDIRPREFIX, $FORTRANMODDIRSUFFIX, $FORTRANPPCOM, $OBJSUFFIX, $SHFORTRANCOM, $SHFORTRANPPCOM.

Uses: $CPPFLAGS, $FORTRANFLAGS, $SHFORTRANFLAGS, $_CPPDEFFLAGS, $_FORTRANINCFLAGS, $_FORTRANMODFLAG.

cXX

Sets construction variables for generic POSIX C++ compilers.

Sets: $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXX, $CXXCOM, $CXXFILESUFFIX, $CXXFLAGS, $INCPREFIX, $INCSUFFIX, $OBJSUFFIX, $SHCXX, $SHCXXCOM, $SHCXXFLAGS, $SHOBJSUFFIX.

Uses: $CXXCOMSTR, $SHCXXCOMSTR.

cyglink

Set construction variables for cygwin linker/loader.

Sets: $IMPLIBPREFIX, $IMPLIBSUFFIX, $LDMODULEVERSIONFLAGS, $LINKFLAGS, $RPATHPREFIX, $RPATHSUFFIX, $SHLIBPREFIX, $SHLIBSUFFIX, $SHLIBVERSIONFLAGS, $SHLINKCOM, $SHLINKFLAGS, $_LDMODULEVERSIONFLAGS, $_SHLIBVERSIONFLAGS.

default

Sets construction variables for a default list of Tool modules. Use default in the tools list to retain the original defaults, since the tools parameter is treated as a literal statement of the tools to be made available in that construction environment, not an addition.

The list of tools selected by default is not static, but is dependent both on the platform and on the software installed on the platform. Some tools will not initialize if an underlying command is not found, and some tools are selected from a list of choices on a first-found basis. The finished tool list can be examined by inspecting the $TOOLS construction variable in the construction environment.

On all platforms, the tools from the following list are selected if their respective conditions are met: filesystem;, wix, lex, yacc, rpcgen, swig, jar, javac, javah, rmic, dvipdf, dvips, gs, tex, latex, pdflatex, pdftex, tar, zip, textfile.

On Linux systems, the default tools list selects (first-found): a C compiler from gcc, intelc, icc, cc; a C++ compiler from g++, intelc, icc, cXX; an assembler from gas, nasm, masm; a linker from gnulink, ilink; a Fortran compiler from gfortran, g77, ifort, ifl, f95, f90, f77; and a static archiver ar. It also selects all found from the list m4 rpm.

On Windows systems, the default tools list selects (first-found): a C compiler from msvc, mingw, gcc, intelc, icl, icc, cc, bcc32; a C++ compiler from msvc, intelc, icc, g++, cXX, bcc32; an assembler from masm, nasm, gas, 386asm; a linker from mslink, gnulink, ilink, linkloc, ilink32; a Fortran compiler from gfortran, g77, ifl, cvf, f95, f90, fortran; and a static archiver from mslib, ar, tlib; It also selects all found from the list msvs, midl.

On MacOS systems, the default tools list selects (first-found): a C compiler from gcc, cc; a C++ compiler from g++, cXX; an assembler as; a linker from applelink, gnulink; a Fortran compiler from gfortran, f95, f90, g77; and a static archiver ar. It also selects all found from the list m4, rpm.

Default lists for other platforms can be found by examining the scons source code (see SCons/Tool/__init__.py).

dmd

Sets construction variables for D language compiler DMD.

Sets: $DC, $DCOM, $DDEBUG, $DDEBUGPREFIX, $DDEBUGSUFFIX, $DFILESUFFIX, $DFLAGPREFIX, $DFLAGS, $DFLAGSUFFIX, $DINCPREFIX, $DINCSUFFIX, $DLIB, $DLIBCOM, $DLIBDIRPREFIX, $DLIBDIRSUFFIX, $DLIBFLAGPREFIX, $DLIBFLAGSUFFIX, $DLIBLINKPREFIX, $DLIBLINKSUFFIX, $DLINK, $DLINKCOM, $DLINKFLAGPREFIX, $DLINKFLAGS, $DLINKFLAGSUFFIX, $DPATH, $DRPATHPREFIX, $DRPATHSUFFIX, $DVERPREFIX, $DVERSIONS, $DVERSUFFIX, $SHDC, $SHDCOM, $SHDLIBVERSIONFLAGS, $SHDLINK, $SHDLINKCOM, $SHDLINKFLAGS.

docbook

This tool tries to make working with Docbook in SCons a little easier. It provides several toolchains for creating different output formats, like HTML or PDF. Contained in the package is a distribution of the Docbook XSL stylesheets as of version 1.76.1. As long as you don't specify your own stylesheets for customization, these official versions are picked as default...which should reduce the inevitable setup hassles for you.

Implicit dependencies to images and XIncludes are detected automatically if you meet the HTML requirements. The additional stylesheet utils/xmldepend.xsl by Paul DuBois is used for this purpose.

Note, that there is no support for XML catalog resolving offered! This tool calls the XSLT processors and PDF renderers with the stylesheets you specified, that's it. The rest lies in your hands and you still have to know what you're doing when resolving names via a catalog.

For activating the tool "docbook", you have to add its name to the Environment constructor, like this

env = Environment(tools=['docbook'])

On its startup, the docbook tool tries to find a required xsltproc processor, and a PDF renderer, e.g. fop. So make sure that these are added to your system's environment PATH and can be called directly without specifying their full path.

For the most basic processing of Docbook to HTML, you need to have installed

the Python lxml binding to libxml2, or
a standalone XSLT processor, currently detected are xsltproc, saxon, saxon-xslt and xalan.

Rendering to PDF requires you to have one of the applications fop or xep installed.

Creating a HTML or PDF document is very simple and straightforward. Say

env = Environment(tools=['docbook'])
env.DocbookHtml('manual.html', 'manual.xml')
env.DocbookPdf('manual.pdf', 'manual.xml')

to get both outputs from your XML source manual.xml. As a shortcut, you can give the stem of the filenames alone, like this:

env = Environment(tools=['docbook'])
env.DocbookHtml('manual')
env.DocbookPdf('manual')

and get the same result. Target and source lists are also supported:

env = Environment(tools=['docbook'])
env.DocbookHtml(['manual.html','reference.html'], ['manual.xml','reference.xml'])

or even

env = Environment(tools=['docbook'])
env.DocbookHtml(['manual','reference'])

Important

Whenever you leave out the list of sources, you may not specify a file extension! The Tool uses the given names as file stems, and adds the suffixes for target and source files accordingly.

The rules given above are valid for the Builders DocbookHtml, DocbookPdf, DocbookEpub, DocbookSlidesPdf and DocbookXInclude. For the DocbookMan transformation you can specify a target name, but the actual output names are automatically set from the refname entries in your XML source.

The Builders DocbookHtmlChunked, DocbookHtmlhelp and DocbookSlidesHtml are special, in that:

they create a large set of files, where the exact names and their number depend on the content of the source file, and
the main target is always named index.html, i.e. the output name for the XSL transformation is not picked up by the stylesheets.

As a result, there is simply no use in specifying a target HTML name. So the basic syntax for these builders is always:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('manual')

If you want to use a specific XSL file, you can set the additional xsl parameter to your Builder call as follows:

env.DocbookHtml('other.html', 'manual.xml', xsl='html.xsl')

Since this may get tedious if you always use the same local naming for your customized XSL files, e.g. html.xsl for HTML and pdf.xsl for PDF output, a set of variables for setting the default XSL name is provided. These are:

DOCBOOK_DEFAULT_XSL_HTML
DOCBOOK_DEFAULT_XSL_HTMLCHUNKED
DOCBOOK_DEFAULT_XSL_HTMLHELP
DOCBOOK_DEFAULT_XSL_PDF
DOCBOOK_DEFAULT_XSL_EPUB
DOCBOOK_DEFAULT_XSL_MAN
DOCBOOK_DEFAULT_XSL_SLIDESPDF
DOCBOOK_DEFAULT_XSL_SLIDESHTML

and you can set them when constructing your environment:

env = Environment(
    tools=['docbook'],
    DOCBOOK_DEFAULT_XSL_HTML='html.xsl',
    DOCBOOK_DEFAULT_XSL_PDF='pdf.xsl',
)
env.DocbookHtml('manual')  # now uses html.xsl

Sets: $DOCBOOK_DEFAULT_XSL_EPUB, $DOCBOOK_DEFAULT_XSL_HTML, $DOCBOOK_DEFAULT_XSL_HTMLCHUNKED, $DOCBOOK_DEFAULT_XSL_HTMLHELP, $DOCBOOK_DEFAULT_XSL_MAN, $DOCBOOK_DEFAULT_XSL_PDF, $DOCBOOK_DEFAULT_XSL_SLIDESHTML, $DOCBOOK_DEFAULT_XSL_SLIDESPDF, $DOCBOOK_FOP, $DOCBOOK_FOPCOM, $DOCBOOK_FOPFLAGS, $DOCBOOK_XMLLINT, $DOCBOOK_XMLLINTCOM, $DOCBOOK_XMLLINTFLAGS, $DOCBOOK_XSLTPROC, $DOCBOOK_XSLTPROCCOM, $DOCBOOK_XSLTPROCFLAGS, $DOCBOOK_XSLTPROCPARAMS.

Uses: $DOCBOOK_FOPCOMSTR, $DOCBOOK_XMLLINTCOMSTR, $DOCBOOK_XSLTPROCCOMSTR.

dvi

Attaches the DVI builder to the construction environment.

dvipdf

Sets construction variables for the dvipdf utility.

Sets: $DVIPDF, $DVIPDFCOM, $DVIPDFFLAGS.

Uses: $DVIPDFCOMSTR.

dvips

Sets construction variables for the dvips utility.

Sets: $DVIPS, $DVIPSFLAGS, $PSCOM, $PSPREFIX, $PSSUFFIX.

Uses: $PSCOMSTR.

f03

Set construction variables for generic POSIX Fortran 03 compilers.

Sets: $F03, $F03COM, $F03FLAGS, $F03PPCOM, $SHF03, $SHF03COM, $SHF03FLAGS, $SHF03PPCOM, $_F03INCFLAGS.

Uses: $F03COMSTR, $F03PPCOMSTR, $FORTRANCOMMONFLAGS, $SHF03COMSTR, $SHF03PPCOMSTR.

f08

Set construction variables for generic POSIX Fortran 08 compilers.

Sets: $F08, $F08COM, $F08FLAGS, $F08PPCOM, $SHF08, $SHF08COM, $SHF08FLAGS, $SHF08PPCOM, $_F08INCFLAGS.

Uses: $F08COMSTR, $F08PPCOMSTR, $FORTRANCOMMONFLAGS, $SHF08COMSTR, $SHF08PPCOMSTR.

f77

Set construction variables for generic POSIX Fortran 77 compilers.

Sets: $F77, $F77COM, $F77FILESUFFIXES, $F77FLAGS, $F77PPCOM, $F77PPFILESUFFIXES, $FORTRAN, $FORTRANCOM, $FORTRANFLAGS, $SHF77, $SHF77COM, $SHF77FLAGS, $SHF77PPCOM, $SHFORTRAN, $SHFORTRANCOM, $SHFORTRANFLAGS, $SHFORTRANPPCOM, $_F77INCFLAGS.

Uses: $F77COMSTR, $F77PPCOMSTR, $FORTRANCOMMONFLAGS, $FORTRANCOMSTR, $FORTRANFLAGS, $FORTRANPPCOMSTR, $SHF77COMSTR, $SHF77PPCOMSTR, $SHFORTRANCOMSTR, $SHFORTRANFLAGS, $SHFORTRANPPCOMSTR.

f90

Set construction variables for generic POSIX Fortran 90 compilers.

Sets: $F90, $F90COM, $F90FLAGS, $F90PPCOM, $SHF90, $SHF90COM, $SHF90FLAGS, $SHF90PPCOM, $_F90INCFLAGS.

Uses: $F90COMSTR, $F90PPCOMSTR, $FORTRANCOMMONFLAGS, $SHF90COMSTR, $SHF90PPCOMSTR.

f95

Set construction variables for generic POSIX Fortran 95 compilers.

Sets: $F95, $F95COM, $F95FLAGS, $F95PPCOM, $SHF95, $SHF95COM, $SHF95FLAGS, $SHF95PPCOM, $_F95INCFLAGS.

Uses: $F95COMSTR, $F95PPCOMSTR, $FORTRANCOMMONFLAGS, $SHF95COMSTR, $SHF95PPCOMSTR.

fortran

Set construction variables for generic POSIX Fortran compilers.

Sets: $FORTRAN, $FORTRANCOM, $FORTRANFLAGS, $SHFORTRAN, $SHFORTRANCOM, $SHFORTRANFLAGS, $SHFORTRANPPCOM.

Uses: $CPPFLAGS, $FORTRANCOMSTR, $FORTRANPPCOMSTR, $SHFORTRANCOMSTR, $SHFORTRANPPCOMSTR, $_CPPDEFFLAGS.

g++

Set construction variables for the g++ C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXXFLAGS, $SHOBJSUFFIX.

g77

Set construction variables for the g77 Fortran compiler.

Sets: $F77, $F77COM, $F77FILESUFFIXES, $F77PPCOM, $F77PPFILESUFFIXES, $FORTRAN, $FORTRANCOM, $FORTRANPPCOM, $SHF77, $SHF77COM, $SHF77FLAGS, $SHF77PPCOM, $SHFORTRAN, $SHFORTRANCOM, $SHFORTRANFLAGS, $SHFORTRANPPCOM.

Uses: $F77FLAGS, $FORTRANCOMMONFLAGS, $FORTRANFLAGS.

gas

Sets construction variables for the gas assembler. Calls the as tool.

Sets: $AS.

gcc

Set construction variables for the gcc C compiler.

Sets: $CC, $CCDEPFLAGS, $CCVERSION, $SHCCFLAGS.

gdc

Sets construction variables for the D language compiler GDC.

gettext

This is actually a toolset, which supports internationalization and localization of software being constructed with SCons. The toolset loads following tools:

xgettext - to extract internationalized messages from source code to POT file(s),
msginit - may be optionally used to initialize PO files,
msgmerge - to update PO files, that already contain translated messages,
msgfmt - to compile textual PO file to binary installable MO file.

When you enable gettext, it internally loads all abovementioned tools, so you're encouraged to see their individual documentation.

Each of the above tools provides its own builder(s) which may be used to perform particular activities related to software internationalization. You may be however interested in top-level Translate builder.

To use gettext tools add 'gettext' tool to your environment:

  env = Environment( tools = ['default', 'gettext'] )

gfortran

Sets construction variables for the GNU Fortran compiler. Calls the fortran Tool module to set variables.

Sets: $F77, $F90, $F95, $FORTRAN, $SHF77, $SHF77FLAGS, $SHF90, $SHF90FLAGS, $SHF95, $SHF95FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

gnulink

Set construction variables for GNU linker/loader.

Sets: $LDMODULEVERSIONFLAGS, $RPATHPREFIX, $RPATHSUFFIX, $SHLIBVERSIONFLAGS, $SHLINKFLAGS, $_LDMODULESONAME, $_SHLIBSONAME.

gs

This Tool sets the required construction variables for working with the Ghostscript software. It also registers an appropriate Action with the PDF Builder, such that the conversion from PS/EPS to PDF happens automatically for the TeX/LaTeX toolchain. Finally, it adds an explicit Gs Builder for Ghostscript to the environment.

Sets: $GS, $GSCOM, $GSFLAGS.

Uses: $GSCOMSTR.

hpc++

Set construction variables for the compilers aCC on HP/UX systems.

hpcc

Set construction variables for aCC compilers on HP/UX systems. Calls the cXX tool for additional variables.

Sets: $CXX, $CXXVERSION, $SHCXXFLAGS.

hplink

Sets construction variables for the linker on HP/UX systems.

Sets: $LINKFLAGS, $SHLIBSUFFIX, $SHLINKFLAGS.

icc

Sets construction variables for the icc compiler on OS/2 systems.

Sets: $CC, $CCCOM, $CFILESUFFIX, $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXXCOM, $CXXFILESUFFIX, $INCPREFIX, $INCSUFFIX.

Uses: $CCFLAGS, $CFLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

icl

Sets construction variables for the Intel C/C++ compiler. Calls the intelc Tool module to set its variables.

ifl

Sets construction variables for the Intel Fortran compiler.

Sets: $FORTRAN, $FORTRANCOM, $FORTRANPPCOM, $SHFORTRANCOM, $SHFORTRANPPCOM.

Uses: $CPPFLAGS, $FORTRANFLAGS, $_CPPDEFFLAGS, $_FORTRANINCFLAGS.

ifort

Sets construction variables for newer versions of the Intel Fortran compiler for Linux.

Sets: $F77, $F90, $F95, $FORTRAN, $SHF77, $SHF77FLAGS, $SHF90, $SHF90FLAGS, $SHF95, $SHF95FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

ilink

Sets construction variables for the ilink linker on OS/2 systems.

Sets: $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS.

ilink32

Sets construction variables for the Borland ilink32 linker.

Sets: $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS.

install

Sets construction variables for file and directory installation.

Sets: $INSTALL, $INSTALLSTR.

intelc

Sets construction variables for the Intel C/C++ compiler (Linux and Windows, version 7 and later). Calls the gcc or msvc (on Linux and Windows, respectively) tool to set underlying variables.

Sets: $AR, $CC, $CXX, $INTEL_C_COMPILER_VERSION, $LINK.

jar

Sets construction variables for the jar utility.

Sets: $JAR, $JARCOM, $JARFLAGS, $JARSUFFIX.

Uses: $JARCOMSTR.

javac

Sets construction variables for the javac compiler.

Sets: $JAVABOOTCLASSPATH, $JAVAC, $JAVACCOM, $JAVACFLAGS, $JAVACLASSPATH, $JAVACLASSSUFFIX, $JAVAINCLUDES, $JAVASOURCEPATH, $JAVASUFFIX.

Uses: $JAVACCOMSTR.

javah

Sets construction variables for the javah tool.

Sets: $JAVACLASSSUFFIX, $JAVAH, $JAVAHCOM, $JAVAHFLAGS.

Uses: $JAVACLASSPATH, $JAVAHCOMSTR.

latex

Sets construction variables for the latex utility.

Sets: $LATEX, $LATEXCOM, $LATEXFLAGS.

Uses: $LATEXCOMSTR.

ldc

Sets construction variables for the D language compiler LDC2.

lex

Sets construction variables for the lex lexical analyser.

Sets: $LEX, $LEXCOM, $LEXFLAGS, $LEXUNISTD.

Uses: $LEXCOMSTR, $LEXFLAGS, $LEX_HEADER_FILE, $LEX_TABLES_FILE.

link

Sets construction variables for generic POSIX linkers. This is a "smart" linker tool which selects a compiler to complete the linking based on the types of source files.

Sets: $LDMODULE, $LDMODULECOM, $LDMODULEFLAGS, $LDMODULENOVERSIONSYMLINKS, $LDMODULEPREFIX, $LDMODULESUFFIX, $LDMODULEVERSION, $LDMODULEVERSIONFLAGS, $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS, $SHLIBSUFFIX, $SHLINK, $SHLINKCOM, $SHLINKFLAGS, $__LDMODULEVERSIONFLAGS, $__SHLIBVERSIONFLAGS.

Uses: $LDMODULECOMSTR, $LINKCOMSTR, $SHLINKCOMSTR.

linkloc

Sets construction variables for the LinkLoc linker for the Phar Lap ETS embedded operating system.

Sets: $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS, $SHLINK, $SHLINKCOM, $SHLINKFLAGS.

Uses: $LINKCOMSTR, $SHLINKCOMSTR.

m4

Sets construction variables for the m4 macro processor.

Sets: $M4, $M4COM, $M4FLAGS.

Uses: $M4COMSTR.

masm

Sets construction variables for the Microsoft assembler.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $ASCOMSTR, $ASPPCOMSTR, $CPPFLAGS, $_CPPDEFFLAGS, $_CPPINCFLAGS.

midl

Sets construction variables for the Microsoft IDL compiler.

Sets: $MIDL, $MIDLCOM, $MIDLFLAGS.

Uses: $MIDLCOMSTR.

mingw

Sets construction variables for MinGW (Minimal Gnu on Windows).

Sets: $AS, $CC, $CXX, $LDMODULECOM, $LIBPREFIX, $LIBSUFFIX, $OBJSUFFIX, $RC, $RCCOM, $RCFLAGS, $RCINCFLAGS, $RCINCPREFIX, $RCINCSUFFIX, $SHCCFLAGS, $SHCXXFLAGS, $SHLINKCOM, $SHLINKFLAGS, $SHOBJSUFFIX, $WINDOWSDEFPREFIX, $WINDOWSDEFSUFFIX.

Uses: $RCCOMSTR, $SHLINKCOMSTR.

msgfmt

This scons tool is a part of scons gettext toolset. It provides scons interface to msgfmt(1) command, which generates binary message catalog (MO) from a textual translation description (PO).

Sets: $MOSUFFIX, $MSGFMT, $MSGFMTCOM, $MSGFMTCOMSTR, $MSGFMTFLAGS, $POSUFFIX.

Uses: $LINGUAS_FILE.

msginit

This scons tool is a part of scons gettext toolset. It provides scons interface to msginit(1) program, which creates new PO file, initializing the meta information with values from user's environment (or options).

Sets: $MSGINIT, $MSGINITCOM, $MSGINITCOMSTR, $MSGINITFLAGS, $POAUTOINIT, $POCREATE_ALIAS, $POSUFFIX, $POTSUFFIX, $_MSGINITLOCALE.

Uses: $LINGUAS_FILE, $POAUTOINIT, $POTDOMAIN.

msgmerge

This scons tool is a part of scons gettext toolset. It provides scons interface to msgmerge(1) command, which merges two Uniform style .po files together.

Sets: $MSGMERGE, $MSGMERGECOM, $MSGMERGECOMSTR, $MSGMERGEFLAGS, $POSUFFIX, $POTSUFFIX, $POUPDATE_ALIAS.

Uses: $LINGUAS_FILE, $POAUTOINIT, $POTDOMAIN.

mslib

Sets construction variables for the Microsoft mslib library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX.

Uses: $ARCOMSTR.

mslink

Sets construction variables for the Microsoft linker.

Sets: $LDMODULE, $LDMODULECOM, $LDMODULEFLAGS, $LDMODULEPREFIX, $LDMODULESUFFIX, $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $LINKFLAGS, $REGSVR, $REGSVRCOM, $REGSVRFLAGS, $SHLINK, $SHLINKCOM, $SHLINKFLAGS, $WINDOWSDEFPREFIX, $WINDOWSDEFSUFFIX, $WINDOWSEXPPREFIX, $WINDOWSEXPSUFFIX, $WINDOWSPROGMANIFESTPREFIX, $WINDOWSPROGMANIFESTSUFFIX, $WINDOWSSHLIBMANIFESTPREFIX, $WINDOWSSHLIBMANIFESTSUFFIX, $WINDOWS_INSERT_DEF.

Uses: $LDMODULECOMSTR, $LINKCOMSTR, $REGSVRCOMSTR, $SHLINKCOMSTR.

mssdk

Sets variables for Microsoft Platform SDK and/or Windows SDK. Note that unlike most other Tool modules, mssdk does not set construction variables, but sets the environment variables in the environment SCons uses to execute the Microsoft toolchain: %INCLUDE%, %LIB%, %LIBPATH% and %PATH%.

Uses: $MSSDK_DIR, $MSSDK_VERSION, $MSVS_VERSION.

msvc

Sets construction variables for the Microsoft Visual C/C++ compiler.

Sets: $BUILDERS, $CC, $CCCOM, $CCDEPFLAGS, $CCFLAGS, $CCPCHFLAGS, $CCPDBFLAGS, $CFILESUFFIX, $CFLAGS, $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXX, $CXXCOM, $CXXFILESUFFIX, $CXXFLAGS, $INCPREFIX, $INCSUFFIX, $OBJPREFIX, $OBJSUFFIX, $PCHCOM, $PCHPDBFLAGS, $RC, $RCCOM, $RCFLAGS, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHCXX, $SHCXXCOM, $SHCXXFLAGS, $SHOBJPREFIX, $SHOBJSUFFIX.

Uses: $CCCOMSTR, $CXXCOMSTR, $MSVC_NOTFOUND_POLICY, $PCH, $PCHSTOP, $PDB, $SHCCCOMSTR, $SHCXXCOMSTR.

msvs

Sets construction variables for Microsoft Visual Studio.

Sets: $MSVSBUILDCOM, $MSVSCLEANCOM, $MSVSENCODING, $MSVSPROJECTCOM, $MSVSREBUILDCOM, $MSVSSCONS, $MSVSSCONSCOM, $MSVSSCONSCRIPT, $MSVSSCONSFLAGS, $MSVSSOLUTIONCOM.

mwcc

Sets construction variables for the Metrowerks CodeWarrior compiler.

Sets: $CC, $CCCOM, $CFILESUFFIX, $CPPDEFPREFIX, $CPPDEFSUFFIX, $CXX, $CXXCOM, $CXXFILESUFFIX, $INCPREFIX, $INCSUFFIX, $MWCW_VERSION, $MWCW_VERSIONS, $SHCC, $SHCCCOM, $SHCCFLAGS, $SHCFLAGS, $SHCXX, $SHCXXCOM, $SHCXXFLAGS.

Uses: $CCCOMSTR, $CXXCOMSTR, $SHCCCOMSTR, $SHCXXCOMSTR.

mwld

Sets construction variables for the Metrowerks CodeWarrior linker.

Sets: $AR, $ARCOM, $LIBDIRPREFIX, $LIBDIRSUFFIX, $LIBLINKPREFIX, $LIBLINKSUFFIX, $LINK, $LINKCOM, $SHLINK, $SHLINKCOM, $SHLINKFLAGS.

nasm

Sets construction variables for the nasm Netwide Assembler.

Sets: $AS, $ASCOM, $ASFLAGS, $ASPPCOM, $ASPPFLAGS.

Uses: $ASCOMSTR, $ASPPCOMSTR.

ninja

Sets up the Ninja builder, which generates a ninja build file, and then optionally runs ninja.

Note

This is an experimental feature. This functionality is subject to change and/or removal without a deprecation cycle.

Sets: $IMPLICIT_COMMAND_DEPENDENCIES, $NINJA_ALIAS_NAME, $NINJA_CMD_ARGS, $NINJA_COMPDB_EXPAND, $NINJA_DEPFILE_PARSE_FORMAT, $NINJA_DIR, $NINJA_DISABLE_AUTO_RUN, $NINJA_ENV_VAR_CACHE, $NINJA_FILE_NAME, $NINJA_FORCE_SCONS_BUILD, $NINJA_GENERATED_SOURCE_ALIAS_NAME, $NINJA_GENERATED_SOURCE_SUFFIXES, $NINJA_MSVC_DEPS_PREFIX, $NINJA_POOL, $NINJA_REGENERATE_DEPS, $NINJA_SCONS_DAEMON_KEEP_ALIVE, $NINJA_SCONS_DAEMON_PORT, $NINJA_SYNTAX, $_NINJA_REGENERATE_DEPS_FUNC.

Uses: $AR, $ARCOM, $ARFLAGS, $CC, $CCCOM, $CCDEPFLAGS, $CCFLAGS, $CXX, $CXXCOM, $ESCAPE, $LINK, $LINKCOM, $PLATFORM, $PRINT_CMD_LINE_FUNC, $PROGSUFFIX, $RANLIB, $RANLIBCOM, $SHCCCOM, $SHCXXCOM, $SHLINK, $SHLINKCOM.

packaging

Sets construction variables for the Package Builder. If this tool is enabled, the --package-type command-line option is also enabled.

pdf

Sets construction variables for the Portable Document Format builder.

Sets: $PDFPREFIX, $PDFSUFFIX.

pdflatex

Sets construction variables for the pdflatex utility.

Sets: $LATEXRETRIES, $PDFLATEX, $PDFLATEXCOM, $PDFLATEXFLAGS.

Uses: $PDFLATEXCOMSTR.

pdftex

Sets construction variables for the pdftex utility.

Sets: $LATEXRETRIES, $PDFLATEX, $PDFLATEXCOM, $PDFLATEXFLAGS, $PDFTEX, $PDFTEXCOM, $PDFTEXFLAGS.

Uses: $PDFLATEXCOMSTR, $PDFTEXCOMSTR.

python

Loads the Python source scanner into the invoking environment. When loaded, the scanner will attempt to find implicit dependencies for any Python source files in the list of sources provided to an Action that uses this environment.

Available since scons 4.0..

qt

Sets construction variables for building Qt3 applications.

Note

This tool is only suitable for building targeted to Qt3, which is obsolete (the tool is deprecated since 4.3). There are contributed tools for Qt4 and Qt5, see https://github.com/SCons/scons-contrib. Qt4 has also passed end of life for standard support (in Dec 2015).

Note paths for these construction variables are assembled using the os.path.join method so they will have the appropriate separator at runtime, but are listed here in the various entries only with the '/' separator for simplicity.

In addition, the construction variables $CPPPATH, $LIBPATH and $LIBS may be modified and the variables $PROGEMITTER, $SHLIBEMITTER and $LIBEMITTER are modified. Because the build-performance is affected when using this tool, you have to explicitly specify it at Environment creation:

Environment(tools=['default','qt'])

The qt tool supports the following operations:

Automatic moc file generation from header files. You do not have to specify moc files explicitly, the tool does it for you. However, there are a few preconditions to do so: Your header file must have the same filebase as your implementation file and must stay in the same directory. It must have one of the suffixes .h, .hpp, .H, .hxx, .hh. You can turn off automatic moc file generation by setting $QT_AUTOSCAN to False. See also the corresponding Moc Builder.

Automatic moc file generation from C++ files. As described in the Qt documentation, include the moc file at the end of the C++ file. Note that you have to include the file, which is generated by the transformation ${QT_MOCCXXPREFIX}<basename>${QT_MOCCXXSUFFIX}, by default <basename>.mo. A warning is generated after building the moc file if you do not include the correct file. If you are using VariantDir, you may need to specify duplicate=True. You can turn off automatic moc file generation by setting $QT_AUTOSCAN to False. See also the corresponding Moc Builder.

Automatic handling of .ui files. The implementation files generated from .ui files are handled much the same as yacc or lex files. Each .ui file given as a source of Program, Library or SharedLibrary will generate three files: the declaration file, the implementation file and a moc file. Because there are also generated headers, you may need to specify duplicate=True in calls to VariantDir. See also the corresponding Uic Builder.

Sets: $QTDIR, $QT_AUTOSCAN, $QT_BINPATH, $QT_CPPPATH, $QT_LIB, $QT_LIBPATH, $QT_MOC, $QT_MOCCXXPREFIX, $QT_MOCCXXSUFFIX, $QT_MOCFROMCXXCOM, $QT_MOCFROMCXXFLAGS, $QT_MOCFROMHCOM, $QT_MOCFROMHFLAGS, $QT_MOCHPREFIX, $QT_MOCHSUFFIX, $QT_UIC, $QT_UICCOM, $QT_UICDECLFLAGS, $QT_UICDECLPREFIX, $QT_UICDECLSUFFIX, $QT_UICIMPLFLAGS, $QT_UICIMPLPREFIX, $QT_UICIMPLSUFFIX, $QT_UISUFFIX.

Uses: $QTDIR.

rmic

Sets construction variables for the rmic utility.

Sets: $JAVACLASSSUFFIX, $RMIC, $RMICCOM, $RMICFLAGS.

Uses: $RMICCOMSTR.

rpcgen

Sets construction variables for building with RPCGEN.

Sets: $RPCGEN, $RPCGENCLIENTFLAGS, $RPCGENFLAGS, $RPCGENHEADERFLAGS, $RPCGENSERVICEFLAGS, $RPCGENXDRFLAGS.

sgiar

Sets construction variables for the SGI library archiver.

Sets: $AR, $ARCOMSTR, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX, $SHLINK, $SHLINKFLAGS.

Uses: $ARCOMSTR, $SHLINKCOMSTR.

sgic++

Sets construction variables for the SGI C++ compiler.

Sets: $CXX, $CXXFLAGS, $SHCXX, $SHOBJSUFFIX.

sgicc

Sets construction variables for the SGI C compiler.

Sets: $CXX, $SHOBJSUFFIX.

sgilink

Sets construction variables for the SGI linker.

Sets: $LINK, $RPATHPREFIX, $RPATHSUFFIX, $SHLINKFLAGS.

sunar

Sets construction variables for the Sun library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX.

Uses: $ARCOMSTR.

sunc++

Sets construction variables for the Sun C++ compiler.

Sets: $CXX, $CXXVERSION, $SHCXX, $SHCXXFLAGS, $SHOBJPREFIX, $SHOBJSUFFIX.

suncc

Sets construction variables for the Sun C compiler.

Sets: $CXX, $SHCCFLAGS, $SHOBJPREFIX, $SHOBJSUFFIX.

sunf77

Set construction variables for the Sun f77 Fortran compiler.

Sets: $F77, $FORTRAN, $SHF77, $SHF77FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

sunf90

Set construction variables for the Sun f90 Fortran compiler.

Sets: $F90, $FORTRAN, $SHF90, $SHF90FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

sunf95

Set construction variables for the Sun f95 Fortran compiler.

Sets: $F95, $FORTRAN, $SHF95, $SHF95FLAGS, $SHFORTRAN, $SHFORTRANFLAGS.

sunlink

Sets construction variables for the Sun linker.

Sets: $RPATHPREFIX, $RPATHSUFFIX, $SHLINKFLAGS.

swig

Sets construction variables for the SWIG interface compiler.

Sets: $SWIG, $SWIGCFILESUFFIX, $SWIGCOM, $SWIGCXXFILESUFFIX, $SWIGDIRECTORSUFFIX, $SWIGFLAGS, $SWIGINCPREFIX, $SWIGINCSUFFIX, $SWIGPATH, $SWIGVERSION, $_SWIGINCFLAGS.

Uses: $SWIGCOMSTR.

tar

Sets construction variables for the tar archiver.

Sets: $TAR, $TARCOM, $TARFLAGS, $TARSUFFIX.

Uses: $TARCOMSTR.

tex

Sets construction variables for the TeX formatter and typesetter.

Sets: $BIBTEX, $BIBTEXCOM, $BIBTEXFLAGS, $LATEX, $LATEXCOM, $LATEXFLAGS, $MAKEINDEX, $MAKEINDEXCOM, $MAKEINDEXFLAGS, $TEX, $TEXCOM, $TEXFLAGS.

Uses: $BIBTEXCOMSTR, $LATEXCOMSTR, $MAKEINDEXCOMSTR, $TEXCOMSTR.

textfile

Set construction variables for the Textfile and Substfile builders.

Sets: $LINESEPARATOR, $SUBSTFILEPREFIX, $SUBSTFILESUFFIX, $TEXTFILEPREFIX, $TEXTFILESUFFIX.

Uses: $SUBST_DICT.

tlib

Sets construction variables for the Borlan tib library archiver.

Sets: $AR, $ARCOM, $ARFLAGS, $LIBPREFIX, $LIBSUFFIX.

Uses: $ARCOMSTR.

xgettext

This scons tool is a part of scons gettext toolset. It provides scons interface to xgettext(1) program, which extracts internationalized messages from source code. The tool provides POTUpdate builder to make PO Template files.

Sets: $POTSUFFIX, $POTUPDATE_ALIAS, $XGETTEXTCOM, $XGETTEXTCOMSTR, $XGETTEXTFLAGS, $XGETTEXTFROM, $XGETTEXTFROMPREFIX, $XGETTEXTFROMSUFFIX, $XGETTEXTPATH, $XGETTEXTPATHPREFIX, $XGETTEXTPATHSUFFIX, $_XGETTEXTDOMAIN, $_XGETTEXTFROMFLAGS, $_XGETTEXTPATHFLAGS.

Uses: $POTDOMAIN.

yacc

Sets construction variables for the yacc parse generator.

Sets: $YACC, $YACCCOM, $YACCFLAGS, $YACCHFILESUFFIX, $YACCHXXFILESUFFIX, $YACCVCGFILESUFFIX.

Uses: $YACCCOMSTR, $YACCFLAGS, $YACC_GRAPH_FILE, $YACC_HEADER_FILE.

zip

Sets construction variables for the zip archiver.

Sets: $ZIP, $ZIPCOM, $ZIPCOMPRESSION, $ZIPFLAGS, $ZIPSUFFIX.

Uses: $ZIPCOMSTR.

Builder Methods

You tell SCons what to build by calling Builders, functions which take particular action(s) to produce target(s) of a particular type (conventionally hinted at by the builder name, e.g. Program) from the specified source files. A builder call is a declaration: SCons enters the specified relationship into its internal dependency node graph, and only later makes the decision on whether anything is actually built, since this depends on command-line options, target selection rules, and whether the target(s) are out of date with respect to the sources.

SCons provides a number of builders, and you can also write your own (see Builder Objects). Builders are created dynamically at run-time, often (though not always) by tools which determine whether the external dependencies for the builder are satisfied, and which perform the necessary setup (see Tools). Builders are attached to a construction environment as methods. The available builder methods are registered as key-value pairs in the $BUILDERS attribute of the construction environment, so the available builders can be examined. This example displays them for debugging purposes:

env = Environment()
print("Builders:", list(env['BUILDERS']))

Builder methods take two required arguments: target and source. The target and source arguments can be specified either as positional arguments, in which case target comes first, or as keyword arguments, using target= and source=. Although both arguments are nominally required, if there is a single source and the target can be inferred the target argument can be omitted (see below). Builder methods also take a variety of keyword arguments, described below.

Because long lists of file names can lead to a lot of quoting in a builder call, SCons supplies a Split global function and a same-named environment method that splits a single string into a list, using strings of white-space characters as the delimiter (similar to the Python string split method, but succeeds even if the input isn't a string).

The following are equivalent examples of calling the Program builder method:

env.Program('bar', ['bar.c', 'foo.c'])
env.Program('bar', Split('bar.c foo.c'))
env.Program('bar', env.Split('bar.c foo.c'))
env.Program(source=['bar.c', 'foo.c'], target='bar')
env.Program(target='bar', source=Split('bar.c foo.c'))
env.Program(target='bar', source=env.Split('bar.c foo.c'))
env.Program('bar', source='bar.c foo.c'.split())

Sources and targets can be specified as a scalar or as a list, composed of either strings or nodes (more on nodes below). When specifying path strings, Python follows the POSIX pathname convention: if a string begins with the operating system pathname separator (on Windows both the slash and backslash separator are accepted, and any leading drive specifier is ignored for the determination) it is considered an absolute path, otherwise it is a relative path. If the path string contains no separator characters, it is searched for as a file in the current directory. If it contains separator characters, the search follows down from the starting point, which is the top of the directory tree for an absolute path and the current directory for a relative path. The "current directory" in this context is the directory of the SConscript file currently being processed.

SCons also recognizes a third way to specify path strings: if the string begins with the # character it is top-relative - it works like a relative path but the search follows down from the directory containing the top-level SConstruct rather than from the current directory. The # can optionally be followed by a pathname separator, which is ignored if found in that position. Top-relative paths only work in places where scons will interpret the path (see some examples below). To be used in other contexts the string will need to be converted to a relative or absolute path first.

Examples:

# The comments describing the targets that will be built
# assume these calls are in a SConscript file in the
# a subdirectory named "subdir".

# Builds the program "subdir/foo" from "subdir/foo.c":
env.Program('foo', 'foo.c')

# Builds the program "/tmp/bar" from "subdir/bar.c":
env.Program('/tmp/bar', 'bar.c')

# An initial '#' or '#/' are equivalent; the following
# calls build the programs "foo" and "bar" (in the
# top-level SConstruct directory) from "subdir/foo.c" and
# "subdir/bar.c", respectively:
env.Program('#foo', 'foo.c')
env.Program('#/bar', 'bar.c')

# Builds the program "other/foo" (relative to the top-level
# SConstruct directory) from "subdir/foo.c":
env.Program('#other/foo', 'foo.c')

# This will not work, only SCons interfaces understand '#',
# os.path.exists is pure Python:
if os.path.exists('#inc/foo.h'):
    env.Append(CPPPATH='#inc')

When the target shares the same base name as the source and only the suffix varies, and if the builder method has a suffix defined for the target file type, then the target argument may be omitted completely, and scons will deduce the target file name from the source file name. The following examples all build the executable program bar (on POSIX systems) or bar.exe (on Windows systems) from the bar.c source file:

env.Program(target='bar', source='bar.c')
env.Program('bar', source='bar.c')
env.Program(source='bar.c')
env.Program('bar.c')

The optional srcdir keyword argument specifies that all source file strings that are not absolute paths or top-relative paths shall be interpreted relative to the specified srcdir. The following example will build the build/prog (or build/prog.exe on Windows) program from the files src/f1.c and src/f2.c:

env.Program('build/prog', ['f1.c', 'f2.c'], srcdir='src')

The optional parse_flags keyword argument causes behavior similar to the env.MergeFlags method, where the argument value is broken into individual settings and merged into the appropriate construction variables.

env.Program('hello', 'hello.c', parse_flags='-Iinclude -DEBUG -lm')

This example adds 'include' to the $CPPPATH construction variable, 'EBUG' to $CPPDEFINES, and 'm' to $LIBS.

The optional chdir keyword argument specifies that the Builder's action(s) should be executed after changing directory. If the chdir argument is a path string or a directory Node, scons will change to the specified directory. If the chdir is not a string or Node and evaluates true, then scons will change to the target file's directory.

Warning

Python only keeps one current directory location even if there are multiple threads. This means that use of the chdir argument will not work with the SCons -j option, because individual worker threads spawned by SCons interfere with each other when they start changing directory.

# scons will change to the "sub" subdirectory
# before executing the "cp" command.
env.Command(
    target='sub/dir/foo.out',
    source='sub/dir/foo.in',
    action="cp dir/foo.in dir/foo.out",
    chdir='sub',
)

# Because chdir is not a string, scons will change to the
# target's directory ("sub/dir") before executing the
# "cp" command.
env.Command('sub/dir/foo.out', 'sub/dir/foo.in', "cp foo.in foo.out", chdir=True)

Note that SCons will not automatically modify its expansion of construction variables like $TARGET and $SOURCE when using the chdir keyword argument--that is, the expanded file names will still be relative to the top-level directory where the SConstruct was found, and consequently incorrect relative to the chdir directory. If you use the chdir keyword argument, you will typically need to supply a different command line using expansions like ${TARGET.file} and ${SOURCE.file} to use just the filename portion of the target and source.

Keyword arguments that are not specifically recognized are treated as construction variable overrides, which replace or add those variables on a limited basis. These overrides will only be in effect when building the target of the builder call, and will not affect other parts of the build. For example, if you want to specify some libraries needed by just one program:

env.Program('hello', 'hello.c', LIBS=['gl', 'glut'])

or generate a shared library with a non-standard suffix:

env.SharedLibrary(
    target='word',
    source='word.cpp',
    SHLIBSUFFIX='.ocx',
    LIBSUFFIXES=['.ocx'],
)

Note that both the $SHLIBSUFFIX and $LIBSUFFIXES construction variables must be set if you want scons to search automatically for dependencies on the non-standard library names; see the descriptions of these variables for more information.

Although the builder methods defined by scons are, in fact, methods of a construction environment object, many may also be called without an explicit environment:

Program('hello', 'hello.c')
SharedLibrary('word', 'word.cpp')

If called this way, the builder will internally use the Default Environment that consists of the tools and values that scons has determined are appropriate for the local system.

Builder methods that can be called without an explicit environment (indicated in the listing of builders below without a leading env.) may be called from custom Python modules that you import into an SConscript file by adding the following to the Python module:

from SCons.Script import *

A builder may add additional targets beyond those requested if an attached Emitter chooses to do so (see the section called “Builder Objects” for more information. $PROGEMITTER is an example). For example, the GNU linker takes a command-line argument -Map=mapfile, which causes it to produce a linker map file in addition to the executable file actually being linked. If the Program builder's emitter is configured to add this mapfile if the option is set, then two targets will be returned when you only provided for one.

For this reason, builder methods always return a NodeList, a list-like object whose elements are Nodes. Nodes are the internal representation of build targets or sources (see the section called “Node Objects” for more information). The returned NodeList object can be passed to other builder methods as source(s) or to other SCons functions or methods where a path string would normally be accepted.

For example, to add a specific preprocessor define when compiling one specific object file but not the others:

bar_obj_list = env.StaticObject('bar.c', CPPDEFINES='-DBAR')
env.Program("prog", ['foo.c', bar_obj_list, 'main.c'])

Using a Node as in this example makes for a more portable build by avoiding having to specify a platform-specific object suffix when calling the Program builder method.

The NodeList object is also convenient to pass to the Default function, for the same reason of avoiding a platform-specific name:

tgt = env.Program("prog", ["foo.c", "bar.c", "main.c"])
Default(tgt)

Builder calls will automatically "flatten" lists passed as source and target, so they are free to contain elements which are themselves lists, such as bar_obj_list returned by the StaticObject call. If you need to manipulate a list of lists returned by builders directly in Python code, you can either build a new list by hand:

foo = Object('foo.c')
bar = Object('bar.c')
objects = ['begin.o'] + foo + ['middle.o'] + bar + ['end.o']
for obj in objects:
    print(str(obj))

Or you can use the Flatten function supplied by SCons to create a list containing just the Nodes, which may be more convenient:

foo = Object('foo.c')
bar = Object('bar.c')
objects = Flatten(['begin.o', foo, 'middle.o', bar, 'end.o'])
for obj in objects:
    print(str(obj))

Since builder calls return a list-like object, not an actual Python list, it is not appropriate to use the Python add operator (+ or +=) to append builder results to a Python list. Because the list and the object are different types, Python will not update the original list in place, but will instead create a new NodeList object containing the concatenation of the list elements and the builder results. This will cause problems for any other Python variables in your SCons configuration that still hold on to a reference to the original list. Instead, use the Python list extend method to make sure the list is updated in-place. Example:

object_files = []

# Do NOT use += here:
#    object_files += Object('bar.c')
#
# It will not update the object_files list in place.
#
# Instead, use the list extend method:
object_files.extend(Object('bar.c'))

The path name for a Node's file may be used by passing the Node to Python's builtin str function:

bar_obj_list = env.StaticObject('bar.c', CPPDEFINES='-DBAR')
print("The path to bar_obj is:", str(bar_obj_list[0]))

Note that because the Builder call returns a NodeList, you have to access the first element in the list (bar_obj_list[0] in the example) to get at the Node that actually represents the object file.

When trying to handle errors that may occur in a builder method, consider that the corresponding Action is executed at a different time than the SConscript file statement calling the builder. It is not useful to wrap a builder call in a try block, since success in the builder call is not the same as the builder itself succeeding. If necessary, a Builder's Action should be coded to exit with a useful exception message indicating the problem in the SConscript files - programmatically recovering from build errors is rarely useful.

The following builder methods are predefined in the SCons core software distribution. Depending on the setup of a particular construction environment and on the type and software installation status of the underlying system, not all builders may be available in that construction environment. Since the function calling signature is the same for all builders:

Buildername(target, source, [key=val, ...])

it is omitted in this listing for brevity.

CFile()
env.CFile()

Builds a C source file given a lex (.l) or yacc (.y) input file. The suffix specified by the $CFILESUFFIX construction variable (.c by default) is automatically added to the target if it is not already present. Example:

# builds foo.c
env.CFile(target = 'foo.c', source = 'foo.l')
# builds bar.c
env.CFile(target = 'bar', source = 'bar.y')

Command()
env.Command()

The Command "Builder" is actually a function that looks like a Builder, but takes a required third argument, which is the action to take to construct the target from the source, used for "one-off" builds where a full builder is not needed. Thus it does not follow the builder calling rules described at the start of this section. See instead the Command function description for the calling syntax and details.

CompilationDatabase()
env.CompilationDatabase()

CompilationDatabase is a special builder which adds a target to create a JSON formatted compilation database compatible with clang tooling (see the LLVM specification). This database is suitable for consumption by various tools and editors who can use it to obtain build and dependency information which otherwise would be internal to SCons. The builder does not require any source files to be specified, rather it arranges to emit information about all of the C, C++ and assembler source/output pairs identified in the build that are not excluded by the optional filter $COMPILATIONDB_PATH_FILTER. The target is subject to the usual SCons target selection rules.

If called with no arguments, the builder will default to a target name of compile_commands.json.

If called with a single positional argument, scons will "deduce" the target name from that source argument, giving it the same name, and then ignore the source. This is the usual way to call the builder if a non-default target name is wanted.

If called with either the target= or source= keyword arguments, the value of the argument is taken as the target name. If called with both, the target= value is used and source= is ignored. If called with multiple sources, the source list will be ignored, since there is no way to deduce what the intent was; in this case the default target name will be used.

Note

You must load the compilation_db tool prior to specifying any part of your build or some source/output files will not show up in the compilation database.

Available since scons 4.0.

CXXFile()
env.CXXFile()

Builds a C++ source file given a lex (.ll) or yacc (.yy) input file. The suffix specified by the $CXXFILESUFFIX construction variable (.cc by default) is automatically added to the target if it is not already present. Example:

# builds foo.cc
env.CXXFile(target = 'foo.cc', source = 'foo.ll')
# builds bar.cc
env.CXXFile(target = 'bar', source = 'bar.yy')

DocbookEpub()
env.DocbookEpub()

A pseudo-Builder, providing a Docbook toolchain for EPUB output.

env = Environment(tools=['docbook'])
env.DocbookEpub('manual.epub', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookEpub('manual')

DocbookHtml()
env.DocbookHtml()

A pseudo-Builder, providing a Docbook toolchain for HTML output.

env = Environment(tools=['docbook'])
env.DocbookHtml('manual.html', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookHtml('manual')

DocbookHtmlChunked()
env.DocbookHtmlChunked()

A pseudo-Builder providing a Docbook toolchain for chunked HTML output. It supports the base.dir parameter. The chunkfast.xsl file (requires "EXSLT") is used as the default stylesheet. Basic syntax:

env = Environment(tools=['docbook'])
env.DocbookHtmlChunked('manual')

where manual.xml is the input file.

If you use the root.filename parameter in your own stylesheets you have to specify the new target name. This ensures that the dependencies get correct, especially for the cleanup via “scons -c”:

env = Environment(tools=['docbook'])
env.DocbookHtmlChunked('mymanual.html', 'manual', xsl='htmlchunk.xsl')

Some basic support for the base.dir parameter is provided. You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:

env = Environment(tools=['docbook'])
env.DocbookHtmlChunked('manual', xsl='htmlchunk.xsl', base_dir='output/')

Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!

DocbookHtmlhelp()
env.DocbookHtmlhelp()

A pseudo-Builder, providing a Docbook toolchain for HTMLHELP output. Its basic syntax is:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('manual')

where manual.xml is the input file.

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('mymanual.html', 'manual', xsl='htmlhelp.xsl')

Some basic support for the base.dir parameter is provided. You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:

env = Environment(tools=['docbook'])
env.DocbookHtmlhelp('manual', xsl='htmlhelp.xsl', base_dir='output/')

Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!

DocbookMan()
env.DocbookMan()

A pseudo-Builder, providing a Docbook toolchain for Man page output. Its basic syntax is:

env = Environment(tools=['docbook'])
env.DocbookMan('manual')

where manual.xml is the input file. Note, that you can specify a target name, but the actual output names are automatically set from the refname entries in your XML source.

DocbookPdf()
env.DocbookPdf()

A pseudo-Builder, providing a Docbook toolchain for PDF output.

env = Environment(tools=['docbook'])
env.DocbookPdf('manual.pdf', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookPdf('manual')

DocbookSlidesHtml()
env.DocbookSlidesHtml()

A pseudo-Builder, providing a Docbook toolchain for HTML slides output.

env = Environment(tools=['docbook'])
env.DocbookSlidesHtml('manual')

If you use the titlefoil.html parameter in your own stylesheets you have to give the new target name. This ensures that the dependencies get correct, especially for the cleanup via “scons -c”:

env = Environment(tools=['docbook'])
env.DocbookSlidesHtml('mymanual.html','manual', xsl='slideshtml.xsl')

Some basic support for the base.dir parameter is provided. You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:

env = Environment(tools=['docbook'])
env.DocbookSlidesHtml('manual', xsl='slideshtml.xsl', base_dir='output/')

Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!

DocbookSlidesPdf()
env.DocbookSlidesPdf()

A pseudo-Builder, providing a Docbook toolchain for PDF slides output.

env = Environment(tools=['docbook'])
env.DocbookSlidesPdf('manual.pdf', 'manual.xml')

or simply

env = Environment(tools=['docbook'])
env.DocbookSlidesPdf('manual')

DocbookXInclude()
env.DocbookXInclude()

A pseudo-Builder, for resolving XIncludes in a separate processing step.

env = Environment(tools=['docbook'])
env.DocbookXInclude('manual_xincluded.xml', 'manual.xml')

DocbookXslt()
env.DocbookXslt()

A pseudo-Builder, applying a given XSL transformation to the input file.

env = Environment(tools=['docbook'])
env.DocbookXslt('manual_transformed.xml', 'manual.xml', xsl='transform.xslt')

Note, that this builder requires the xsl parameter to be set.

DVI()
env.DVI()

Builds a .dvi file from a .tex, .ltx or .latex input file. If the source file suffix is .tex, scons will examine the contents of the file; if the string \documentclass or \documentstyle is found, the file is assumed to be a LaTeX file and the target is built by invoking the $LATEXCOM command line; otherwise, the $TEXCOM command line is used. If the file is a LaTeX file, the DVI builder method will also examine the contents of the .aux file and invoke the $BIBTEX command line if the string bibdata is found, start $MAKEINDEX to generate an index if a .ind file is found and will examine the contents .log file and re-run the $LATEXCOM command if the log file says it is necessary.

The suffix .dvi (hard-coded within TeX itself) is automatically added to the target if it is not already present. Examples:

# builds from aaa.tex
env.DVI(target = 'aaa.dvi', source = 'aaa.tex')
# builds bbb.dvi
env.DVI(target = 'bbb', source = 'bbb.ltx')
# builds from ccc.latex
env.DVI(target = 'ccc.dvi', source = 'ccc.latex')

Gs()
env.Gs()

A Builder for explicitly calling the gs executable. Depending on the underlying OS, the different names gs, gsos2 and gswin32c are tried.

env = Environment(tools=['gs'])
env.Gs(
    'cover.jpg',
    'scons-scons.pdf',
    GSFLAGS='-dNOPAUSE -dBATCH -sDEVICE=jpeg -dFirstPage=1 -dLastPage=1 -q',
)

Install()
env.Install()

Installs one or more source files or directories in the specified target, which must be a directory. The names of the specified source files or directories remain the same within the destination directory. The sources may be given as a string or as a node returned by a builder.

env.Install(target='/usr/local/bin', source=['foo', 'bar'])

Note that if target paths chosen for the Install builder (and the related InstallAs and InstallVersionedLib builders) are outside the project tree, such as in the example above, they may not be selected for "building" by default, since in the absence of other instructions scons builds targets that are underneath the top directory (the directory that contains the SConstruct file, usually the current directory). Use command line targets or the Default function in this case.

If the --install-sandbox command line option is given, the target directory will be prefixed by the directory path specified. This is useful to test installs without installing to a "live" location in the system.

See also FindInstalledFiles. For more thoughts on installation, see the User Guide (particularly the section on Command-Line Targets and the chapters on Installing Files and on Alias Targets).

InstallAs()
env.InstallAs()

Installs one or more source files or directories to specific names, allowing changing a file or directory name as part of the installation. It is an error if the target and source arguments list different numbers of files or directories.

env.InstallAs(target='/usr/local/bin/foo',
              source='foo_debug')
env.InstallAs(target=['../lib/libfoo.a', '../lib/libbar.a'],
              source=['libFOO.a', 'libBAR.a'])

See the note under Install.

InstallVersionedLib()
env.InstallVersionedLib()

Installs a versioned shared library. The symlinks appropriate to the architecture will be generated based on symlinks of the source library.

env.InstallVersionedLib(target='/usr/local/bin/foo',
                        source='libxyz.1.5.2.so')

See the note under Install.

Jar()
env.Jar()

Builds a Java archive (.jar) file from the specified list of sources. Any directories in the source list will be searched for .class files). Any .java files in the source list will be compiled to .class files by calling the Java Builder.

If the $JARCHDIR value is set, the jar command will change to the specified directory using the -C option. If $JARCHDIR is not set explicitly, SCons will use the top of any subdirectory tree in which Java .class were built by the Java Builder.

If the contents any of the source files begin with the string Manifest-Version, the file is assumed to be a manifest and is passed to the jar command with the m option set.

env.Jar(target = 'foo.jar', source = 'classes')

env.Jar(target = 'bar.jar',
        source = ['bar1.java', 'bar2.java'])

Java()
env.Java()

Builds one or more Java class files. The sources may be any combination of explicit .java files, or directory trees which will be scanned for .java files.

SCons will parse each source .java file to find the classes (including inner classes) defined within that file, and from that figure out the target .class files that will be created. The class files will be placed underneath the specified target directory.

SCons will also search each Java file for the Java package name, which it assumes can be found on a line beginning with the string package in the first column; the resulting .class files will be placed in a directory reflecting the specified package name. For example, the file Foo.java defining a single public Foo class and containing a package name of sub.dir will generate a corresponding sub/dir/Foo.class class file.

Examples:

env.Java(target = 'classes', source = 'src')
env.Java(target = 'classes', source = ['src1', 'src2'])
env.Java(target = 'classes', source = ['File1.java', 'File2.java'])

Java source files can use the native encoding for the underlying OS. Since SCons compiles in simple ASCII mode by default, the compiler will generate warnings about unmappable characters, which may lead to errors as the file is processed further. In this case, the user must specify the LANG environment variable to tell the compiler what encoding is used. For portibility, it's best if the encoding is hard-coded so that the compile will work if it is done on a system with a different encoding.

env = Environment()
env['ENV']['LANG'] = 'en_GB.UTF-8'

JavaH()
env.JavaH()

Builds C header and source files for implementing Java native methods. The target can be either a directory in which the header files will be written, or a header file name which will contain all of the definitions. The source can be the names of .class files, the names of .java files to be compiled into .class files by calling the Java builder method, or the objects returned from the Java builder method.

If the construction variable $JAVACLASSDIR is set, either in the environment or in the call to the JavaH builder method itself, then the value of the variable will be stripped from the beginning of any .class file names.

Examples:

# builds java_native.h
classes = env.Java(target="classdir", source="src")
env.JavaH(target="java_native.h", source=classes)

# builds include/package_foo.h and include/package_bar.h
env.JavaH(target="include", source=["package/foo.class", "package/bar.class"])

# builds export/foo.h and export/bar.h
env.JavaH(
    target="export",
    source=["classes/foo.class", "classes/bar.class"],
    JAVACLASSDIR="classes",
)

Note

Java versions starting with 10.0 no longer use the javah command for generating JNI headers/sources, and indeed have removed the command entirely (see Java Enhancement Proposal JEP 313), making this tool harder to use for that purpose. SCons may autodiscover a javah belonging to an older release if there are multiple Java versions on the system, which will lead to incorrect results. To use with a newer Java, override the default values of $JAVAH (to contain the path to the javac) and $JAVAHFLAGS (to contain at least a -h flag) and note that generating headers with javac requires supplying source .java files only, not .class files.

Library()
env.Library()

A synonym for the StaticLibrary builder method.

LoadableModule()
env.LoadableModule()

On most systems, this is the same as SharedLibrary. On Mac OS X (Darwin) platforms, this creates a loadable module bundle.

M4()
env.M4()

Builds an output file from an M4 input file. This uses a default $M4FLAGS value of -E, which considers all warnings to be fatal and stops on the first warning when using the GNU version of m4. Example:

env.M4(target = 'foo.c', source = 'foo.c.m4')

Moc()
env.Moc()

Builds an output file from a moc input file. moc input files are either header files or C++ files. This builder is only available after using the tool qt. See the $QTDIR variable for more information. Example:

env.Moc('foo.h')  # generates moc_foo.cc
env.Moc('foo.cpp')  # generates foo.moc

MOFiles()
env.MOFiles()

This builder belongs to msgfmt tool. The builder compiles PO files to MO files.

Example 1. Create pl.mo and en.mo by compiling pl.po and en.po:

  # ...
  env.MOFiles(['pl', 'en'])

Example 2. Compile files for languages defined in LINGUAS file:

  # ...
  env.MOFiles(LINGUAS_FILE = 1)

Example 3. Create pl.mo and en.mo by compiling pl.po and en.po plus files for languages defined in LINGUAS file:

  # ...
  env.MOFiles(['pl', 'en'], LINGUAS_FILE = 1)

Example 4. Compile files for languages defined in LINGUAS file (another version):

  # ...
  env['LINGUAS_FILE'] = 1
  env.MOFiles()

MSVSProject()
env.MSVSProject()

Builds a Microsoft Visual Studio project file, and by default builds a solution file as well.

This builds a Visual Studio project file, based on the version of Visual Studio that is configured (either the latest installed version, or the version specified by $MSVS_VERSION in the Environment constructor). For Visual Studio 6, it will generate a .dsp file. For Visual Studio 7, 8, and 9, it will generate a .vcproj file. For Visual Studio 10 and later, it will generate a .vcxproj file.

By default, this also generates a solution file for the specified project, a .dsw file for Visual Studio 6 or a .sln file for Visual Studio 7 and later. This behavior may be disabled by specifying auto_build_solution=0 when you call MSVSProject, in which case you presumably want to build the solution file(s) by calling the MSVSSolution Builder (see below).

The MSVSProject builder takes several lists of filenames to be placed into the project file. These are currently limited to srcs, incs, localincs, resources, and misc. These are pretty self-explanatory, but it should be noted that these lists are added to the $SOURCES construction variable as strings, NOT as SCons File Nodes. This is because they represent file names to be added to the project file, not the source files used to build the project file.

The above filename lists are all optional, although at least one must be specified for the resulting project file to be non-empty.

In addition to the above lists of values, the following values may be specified:

target: The name of the target .dsp or .vcproj file. The correct suffix for the version of Visual Studio must be used, but the $MSVSPROJECTSUFFIX construction variable will be defined to the correct value (see example below).
variant: The name of this particular variant. For Visual Studio 7 projects, this can also be a list of variant names. These are typically things like "Debug" or "Release", but really can be anything you want. For Visual Studio 7 projects, they may also specify a target platform separated from the variant name by a | (vertical pipe) character: Debug|Xbox. The default target platform is Win32. Multiple calls to MSVSProject with different variants are allowed; all variants will be added to the project file with their appropriate build targets and sources.
cmdargs: Additional command line arguments for the different variants. The number of cmdargs entries must match the number of variant entries, or be empty (not specified). If you give only one, it will automatically be propagated to all variants.
cppdefines: Preprocessor definitions for the different variants. The number of cppdefines entries must match the number of variant entries, or be empty (not specified). If you give only one, it will automatically be propagated to all variants. If you don't give this parameter, SCons will use the invoking environment's CPPDEFINES entry for all variants.
cppflags: Compiler flags for the different variants. If a /std:c++ flag is found then /Zc:__cplusplus is appended to the flags if not already found, this ensures that intellisense uses the /std:c++ switch. The number of cppflags entries must match the number of variant entries, or be empty (not specified). If you give only one, it will automatically be propagated to all variants. If you don't give this parameter, SCons will combine the invoking environment's CCFLAGS, CXXFLAGS, CPPFLAGS entries for all variants.
cpppaths: Compiler include paths for the different variants. The number of cpppaths entries must match the number of variant entries, or be empty (not specified). If you give only one, it will automatically be propagated to all variants. If you don't give this parameter, SCons will use the invoking environment's CPPPATH entry for all variants.
buildtarget: An optional string, node, or list of strings or nodes (one per build variant), to tell the Visual Studio debugger what output target to use in what build variant. The number of buildtarget entries must match the number of variant entries.
runfile: The name of the file that Visual Studio 7 and later will run and debug. This appears as the value of the Output field in the resulting Visual Studio project file. If this is not specified, the default is the same as the specified buildtarget value.

Note that because SCons always executes its build commands from the directory in which the SConstruct file is located, if you generate a project file in a different directory than the SConstruct directory, users will not be able to double-click on the file name in compilation error messages displayed in the Visual Studio console output window. This can be remedied by adding the Visual C/C++ /FC compiler option to the $CCFLAGS variable so that the compiler will print the full path name of any files that cause compilation errors.

Example usage:

barsrcs = ['bar.cpp']
barincs = ['bar.h']
barlocalincs = ['StdAfx.h']
barresources = ['bar.rc','resource.h']
barmisc = ['bar_readme.txt']

dll = env.SharedLibrary(target='bar.dll',
                        source=barsrcs)
buildtarget = [s for s in dll if str(s).endswith('dll')]
env.MSVSProject(target='Bar' + env['MSVSPROJECTSUFFIX'],
                srcs=barsrcs,
                incs=barincs,
                localincs=barlocalincs,
                resources=barresources,
                misc=barmisc,
                buildtarget=buildtarget,
                variant='Release')

Starting with version 2.4 of SCons it is also possible to specify the optional argument DebugSettings, which creates files for debugging under Visual Studio:

DebugSettings: A dictionary of debug settings that get written to the .vcproj.user or the .vcxproj.user file, depending on the version installed. As it is done for cmdargs (see above), you can specify a DebugSettings dictionary per variant. If you give only one, it will be propagated to all variants.

Currently, only Visual Studio v9.0 and Visual Studio version v11 are implemented, for other versions no file is generated. To generate the user file, you just need to add a DebugSettings dictionary to the environment with the right parameters for your MSVS version. If the dictionary is empty, or does not contain any good value, no file will be generated.

Following is a more contrived example, involving the setup of a project for variants and DebugSettings:

# Assuming you store your defaults in a file
vars = Variables('variables.py')
msvcver = vars.args.get('vc', '9')

# Check command args to force one Microsoft Visual Studio version
if msvcver == '9' or msvcver == '11':
  env = Environment(MSVC_VERSION=msvcver+'.0', MSVC_BATCH=False)
else:
  env = Environment()

AddOption('--userfile', action='store_true', dest='userfile', default=False,
          help="Create Visual Studio Project user file")

#
# 1. Configure your Debug Setting dictionary with options you want in the list
# of allowed options, for instance if you want to create a user file to launch
# a specific application for testing your dll with Microsoft Visual Studio 2008 (v9):
#
V9DebugSettings = {
    'Command':'c:\\myapp\\using\\thisdll.exe',
    'WorkingDirectory': 'c:\\myapp\\using\\',
    'CommandArguments': '-p password',
#     'Attach':'false',
#     'DebuggerType':'3',
#     'Remote':'1',
#     'RemoteMachine': None,
#     'RemoteCommand': None,
#     'HttpUrl': None,
#     'PDBPath': None,
#     'SQLDebugging': None,
#     'Environment': '',
#     'EnvironmentMerge':'true',
#     'DebuggerFlavor': None,
#     'MPIRunCommand': None,
#     'MPIRunArguments': None,
#     'MPIRunWorkingDirectory': None,
#     'ApplicationCommand': None,
#     'ApplicationArguments': None,
#     'ShimCommand': None,
#     'MPIAcceptMode': None,
#     'MPIAcceptFilter': None,
}

#
# 2. Because there are a lot of different options depending on the Microsoft
# Visual Studio version, if you use more than one version you have to
# define a dictionary per version, for instance if you want to create a user
# file to launch a specific application for testing your dll with Microsoft
# Visual Studio 2012 (v11):
#
V10DebugSettings = {
    'LocalDebuggerCommand': 'c:\\myapp\\using\\thisdll.exe',
    'LocalDebuggerWorkingDirectory': 'c:\\myapp\\using\\',
    'LocalDebuggerCommandArguments': '-p password',
#     'LocalDebuggerEnvironment': None,
#     'DebuggerFlavor': 'WindowsLocalDebugger',
#     'LocalDebuggerAttach': None,
#     'LocalDebuggerDebuggerType': None,
#     'LocalDebuggerMergeEnvironment': None,
#     'LocalDebuggerSQLDebugging': None,
#     'RemoteDebuggerCommand': None,
#     'RemoteDebuggerCommandArguments': None,
#     'RemoteDebuggerWorkingDirectory': None,
#     'RemoteDebuggerServerName': None,
#     'RemoteDebuggerConnection': None,
#     'RemoteDebuggerDebuggerType': None,
#     'RemoteDebuggerAttach': None,
#     'RemoteDebuggerSQLDebugging': None,
#     'DeploymentDirectory': None,
#     'AdditionalFiles': None,
#     'RemoteDebuggerDeployDebugCppRuntime': None,
#     'WebBrowserDebuggerHttpUrl': None,
#     'WebBrowserDebuggerDebuggerType': None,
#     'WebServiceDebuggerHttpUrl': None,
#     'WebServiceDebuggerDebuggerType': None,
#     'WebServiceDebuggerSQLDebugging': None,
}

#
# 3. Select the dictionary you want depending on the version of visual Studio
# Files you want to generate.
#
if not env.GetOption('userfile'):
    dbgSettings = None
elif env.get('MSVC_VERSION', None) == '9.0':
    dbgSettings = V9DebugSettings
elif env.get('MSVC_VERSION', None) == '11.0':
    dbgSettings = V10DebugSettings
else:
    dbgSettings = None

#
# 4. Add the dictionary to the DebugSettings keyword.
#
barsrcs = ['bar.cpp', 'dllmain.cpp', 'stdafx.cpp']
barincs = ['targetver.h']
barlocalincs = ['StdAfx.h']
barresources = ['bar.rc','resource.h']
barmisc = ['ReadMe.txt']

dll = env.SharedLibrary(target='bar.dll',
                        source=barsrcs)

env.MSVSProject(target='Bar' + env['MSVSPROJECTSUFFIX'],
                srcs=barsrcs,
                incs=barincs,
                localincs=barlocalincs,
                resources=barresources,
                misc=barmisc,
                buildtarget=[dll[0]] * 2,
                variant=('Debug|Win32', 'Release|Win32'),
                cmdargs='vc=%s' %  msvcver,
                DebugSettings=(dbgSettings, {}))

MSVSSolution()
env.MSVSSolution()

Builds a Microsoft Visual Studio solution file.

This builds a Visual Studio solution file, based on the version of Visual Studio that is configured (either the latest installed version, or the version specified by $MSVS_VERSION in the construction environment). For Visual Studio 6, it will generate a .dsw file. For Visual Studio 7 (.NET), it will generate a .sln file.

The following values must be specified:

target: The name of the target .dsw or .sln file. The correct suffix for the version of Visual Studio must be used, but the value $MSVSSOLUTIONSUFFIX will be defined to the correct value (see example below).
variant: The name of this particular variant, or a list of variant names (the latter is only supported for MSVS 7 solutions). These are typically things like "Debug" or "Release", but really can be anything you want. For MSVS 7 they may also specify target platform, like this "Debug|Xbox". Default platform is Win32.
projects: A list of project file names, or Project nodes returned by calls to the MSVSProject Builder, to be placed into the solution file. It should be noted that these file names are NOT added to the $SOURCES environment variable in form of files, but rather as strings. This is because they represent file names to be added to the solution file, not the source files used to build the solution file.

Example Usage:

env.MSVSSolution(
    target="Bar" + env["MSVSSOLUTIONSUFFIX"],
    projects=["bar" + env["MSVSPROJECTSUFFIX"]],
    variant="Release",
)

Ninja()
env.Ninja()

A special builder which adds a target to create a Ninja build file. The builder does not require any source files to be specified.

Note

This is an experimental feature. To enable it you must use one of the following methods

# On the command line
--experimental=ninja

# Or in your SConstruct
SetOption('experimental', 'ninja')

This functionality is subject to change and/or removal without deprecation cycle.

To use this tool you need to install the Python ninja package, as the tool by default depends on being able to do an import of the package This can be done via:

python -m pip install ninja

If called with no arguments, the builder will default to a target name of ninja.build.

Available since scons 4.2.

Object()
env.Object()

A synonym for the StaticObject builder method.

Package()
env.Package()

Builds software distribution packages. A package is a container format which includes files to install along with metadata. Packaging is optional, and must be enabled by specifying the packaging tool. For example:

env = Environment(tools=['default', 'packaging'])

SCons can build packages in a number of well known packaging formats. The target package type may be selected with the the $PACKAGETYPE construction variable or the --package-type command line option. The package type may be a list, in which case SCons will attempt to build packages for each type in the list. Example:

env.Package(PACKAGETYPE=['src_zip', 'src_targz'], ...other args...)

The currently supported packagers are:

`msi`	Microsoft Installer package
`rpm`	RPM Package Manger package
`ipkg`	Itsy Package Management package
`tarbz2`	bzip2-compressed tar file
`targz`	gzip-compressed tar file
`tarxz`	xz-compressed tar file
`zip`	zip file
`src_tarbz2`	bzip2-compressed tar file suitable as source to another packager
`src_targz`	gzip-compressed tar file suitable as source to another packager
`src_tarxz`	xz-compressed tar file suitable as source to another packager
`src_zip`	zip file suitable as source to another packager

The file list to include in the package may be specified with the source keyword argument. If omitted, the FindInstalledFiles function is called behind the scenes to select all files that have an Install, InstallAs or InstallVersionedLib Builder attached. If the target keyword argument is omitted, the target name(s) will be deduced from the package type(s).

The metadata comes partly from attributes of the files to be packaged, and partly from packaging tags. Tags can be passed as keyword arguments to the Package builder call, and may also be attached to files (or more accurately, Nodes representing files) with the Tag function. Some package-level tags are mandatory, and will lead to errors if omitted. The mandatory tags vary depending on the package type.

While packaging, the builder uses a temporary location named by the value of the $PACKAGEROOT variable - the package sources are copied there before packaging.

Packaging example:

env = Environment(tools=["default", "packaging"])
env.Install("/bin/", "my_program")
env.Package(
    NAME="foo",
    VERSION="1.2.3",
    PACKAGEVERSION=0,
    PACKAGETYPE="rpm",
    LICENSE="gpl",
    SUMMARY="balalalalal",
    DESCRIPTION="this should be really really long",
    X_RPM_GROUP="Application/fu",
    SOURCE_URL="https://foo.org/foo-1.2.3.tar.gz",
)

In this example, the target /bin/my_program created by the Install call would not be built by default since it is not under the project top directory. However, since no source is specified to the Package builder, it is selected for packaging by the default sources rule. Since packaging is done using $PACKAGEROOT, no write is actually done to the system's /bin directory, and the target will be selected since after rebasing to underneath $PACKAGEROOT it is now under the top directory of the project.

PCH()
env.PCH()

Builds a Microsoft Visual C++ precompiled header. Calling this builder returns a list of two targets: the PCH as the first element, and the object file as the second element. Normally the object file is ignored. This builder is only provided when Microsoft Visual C++ is being used as the compiler. The PCH builder is generally used in conjunction with the $PCH construction variable to force object files to use the precompiled header:

env['PCH'] = env.PCH('StdAfx.cpp')[0]

PDF()
env.PDF()

Builds a .pdf file from a .dvi input file (or, by extension, a .tex, .ltx, or .latex input file). The suffix specified by the $PDFSUFFIX construction variable (.pdf by default) is added automatically to the target if it is not already present. Example:

# builds from aaa.tex
env.PDF(target = 'aaa.pdf', source = 'aaa.tex')
# builds bbb.pdf from bbb.dvi
env.PDF(target = 'bbb', source = 'bbb.dvi')

POInit()
env.POInit()

This builder belongs to msginit tool. The builder initializes missing PO file(s) if $POAUTOINIT is set. If $POAUTOINIT is not set (default), POInit prints instruction for user (that is supposed to be a translator), telling how the PO file should be initialized. In normal projects you should not use POInit and use POUpdate instead. POUpdate chooses intelligently between msgmerge(1) and msginit(1). POInit always uses msginit(1) and should be regarded as builder for special purposes or for temporary use (e.g. for quick, one time initialization of a bunch of PO files) or for tests.

Target nodes defined through POInit are not built by default (they're Ignored from '.' node) but are added to special Alias ('po-create' by default). The alias name may be changed through the $POCREATE_ALIAS construction variable. All PO files defined through POInit may be easily initialized by scons po-create.

Example 1. Initialize en.po and pl.po from messages.pot:

  # ...
  env.POInit(['en', 'pl']) # messages.pot --> [en.po, pl.po]

Example 2. Initialize en.po and pl.po from foo.pot:

  # ...
  env.POInit(['en', 'pl'], ['foo']) # foo.pot --> [en.po, pl.po]

Example 3. Initialize en.po and pl.po from foo.pot but using $POTDOMAIN construction variable:

  # ...
  env.POInit(['en', 'pl'], POTDOMAIN='foo') # foo.pot --> [en.po, pl.po]

Example 4. Initialize PO files for languages defined in LINGUAS file. The files will be initialized from template messages.pot:

  # ...
  env.POInit(LINGUAS_FILE = 1) # needs 'LINGUAS' file

Example 5. Initialize en.po and pl.pl PO files plus files for languages defined in LINGUAS file. The files will be initialized from template messages.pot:

  # ...
  env.POInit(['en', 'pl'], LINGUAS_FILE = 1)

Example 6. You may preconfigure your environment first, and then initialize PO files:

  # ...
  env['POAUTOINIT'] = 1
  env['LINGUAS_FILE'] = 1
  env['POTDOMAIN'] = 'foo'
  env.POInit()

which has same efect as:

  # ...
  env.POInit(POAUTOINIT = 1, LINGUAS_FILE = 1, POTDOMAIN = 'foo')

PostScript()
env.PostScript()

Builds a .ps file from a .dvi input file (or, by extension, a .tex, .ltx, or .latex input file). The suffix specified by the $PSSUFFIX construction variable (.ps by default) is added automatically to the target if it is not already present. Example:

# builds from aaa.tex
env.PostScript(target = 'aaa.ps', source = 'aaa.tex')
# builds bbb.ps from bbb.dvi
env.PostScript(target = 'bbb', source = 'bbb.dvi')

POTUpdate()
env.POTUpdate()

The builder belongs to xgettext tool. The builder updates target POT file if exists or creates one if it doesn't. The node is not built by default (i.e. it is Ignored from '.'), but only on demand (i.e. when given POT file is required or when special alias is invoked). This builder adds its targe node (messages.pot, say) to a special alias (pot-update by default, see $POTUPDATE_ALIAS) so you can update/create them easily with scons pot-update. The file is not written until there is no real change in internationalized messages (or in comments that enter POT file).

Note

You may see xgettext(1) being invoked by the xgettext tool even if there is no real change in internationalized messages (so the POT file is not being updated). This happens every time a source file has changed. In such case we invoke xgettext(1) and compare its output with the content of POT file to decide whether the file should be updated or not.

Example 1. Let's create po/ directory and place following SConstruct script there:

  # SConstruct in 'po/' subdir
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(['foo'], ['../a.cpp', '../b.cpp'])
  env.POTUpdate(['bar'], ['../c.cpp', '../d.cpp'])

Then invoke scons few times:

  user@host:$ scons             # Does not create foo.pot nor bar.pot
  user@host:$ scons foo.pot     # Updates or creates foo.pot
  user@host:$ scons pot-update  # Updates or creates foo.pot and bar.pot
  user@host:$ scons -c          # Does not clean foo.pot nor bar.pot.

the results shall be as the comments above say.

Example 2. The POTUpdate builder may be used with no target specified, in which case default target messages.pot will be used. The default target may also be overridden by setting $POTDOMAIN construction variable or providing it as an override to POTUpdate builder:

    
  # SConstruct script
  env = Environment( tools = ['default', 'xgettext'] )
  env['POTDOMAIN'] = "foo"
  env.POTUpdate(source = ["a.cpp", "b.cpp"]) # Creates foo.pot ...
  env.POTUpdate(POTDOMAIN = "bar", source = ["c.cpp", "d.cpp"]) # and bar.pot

Example 3. The sources may be specified within separate file, for example POTFILES.in:

      
  # POTFILES.in in 'po/' subdirectory
  ../a.cpp
  ../b.cpp
  # end of file

The name of the file (POTFILES.in) containing the list of sources is provided via $XGETTEXTFROM:

      
  # SConstruct file in 'po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in')

Example 4. You may use $XGETTEXTPATH to define source search path. Assume, for example, that you have files a.cpp, b.cpp, po/SConstruct, po/POTFILES.in. Then your POT-related files could look as below:

  # POTFILES.in in 'po/' subdirectory
  a.cpp
  b.cpp
  # end of file

  # SConstruct file in 'po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in', XGETTEXTPATH='../')

Example 5. Multiple search directories may be defined within a list, i.e. XGETTEXTPATH = ['dir1', 'dir2', ...]. The order in the list determines the search order of source files. The path to the first file found is used.

Let's create 0/1/po/SConstruct script:

  # SConstruct file in '0/1/po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in', XGETTEXTPATH=['../', '../../'])

and 0/1/po/POTFILES.in:

  # POTFILES.in in '0/1/po/' subdirectory
  a.cpp
  # end of file

Write two *.cpp files, the first one is 0/a.cpp:

  /* 0/a.cpp */
  gettext("Hello from ../../a.cpp")

and the second is 0/1/a.cpp:

  /* 0/1/a.cpp */
  gettext("Hello from ../a.cpp")

then run scons. You'll obtain 0/1/po/messages.pot with the message "Hello from ../a.cpp". When you reverse order in $XGETTEXTFOM, i.e. when you write SConscript as

  # SConstruct file in '0/1/po/' subdirectory
  env = Environment( tools = ['default', 'xgettext'] )
  env.POTUpdate(XGETTEXTFROM = 'POTFILES.in', XGETTEXTPATH=['../../', '../'])

then the messages.pot will contain msgid "Hello from ../../a.cpp" line and not msgid "Hello from ../a.cpp".

POUpdate()
env.POUpdate()

The builder belongs to msgmerge tool. The builder updates PO files with msgmerge(1), or initializes missing PO files as described in documentation of msginit tool and POInit builder (see also $POAUTOINIT). Note, that POUpdate does not add its targets to po-create alias as POInit does.

Target nodes defined through POUpdate are not built by default (they're Ignored from '.' node). Instead, they are added automatically to special Alias ('po-update' by default). The alias name may be changed through the $POUPDATE_ALIAS construction variable. You can easily update PO files in your project by scons po-update.

Example 1. Update en.po and pl.po from messages.pot template (see also $POTDOMAIN), assuming that the later one exists or there is rule to build it (see POTUpdate):

  # ...
  env.POUpdate(['en','pl']) # messages.pot --> [en.po, pl.po]

Example 2. Update en.po and pl.po from foo.pot template:

  # ...
  env.POUpdate(['en', 'pl'], ['foo']) # foo.pot -->  [en.po, pl.pl]

Example 3. Update en.po and pl.po from foo.pot (another version):

  # ...
  env.POUpdate(['en', 'pl'], POTDOMAIN='foo') # foo.pot -- > [en.po, pl.pl]

Example 4. Update files for languages defined in LINGUAS file. The files are updated from messages.pot template:

  # ...
  env.POUpdate(LINGUAS_FILE = 1) # needs 'LINGUAS' file

Example 5. Same as above, but update from foo.pot template:

  # ...
  env.POUpdate(LINGUAS_FILE = 1, source = ['foo'])

Example 6. Update en.po and pl.po plus files for languages defined in LINGUAS file. The files are updated from messages.pot template:

  # produce 'en.po', 'pl.po' + files defined in 'LINGUAS':
  env.POUpdate(['en', 'pl' ], LINGUAS_FILE = 1)

Example 7. Use $POAUTOINIT to automatically initialize PO file if it doesn't exist:

  # ...
  env.POUpdate(LINGUAS_FILE = 1, POAUTOINIT = 1)

Example 8. Update PO files for languages defined in LINGUAS file. The files are updated from foo.pot template. All necessary settings are pre-configured via environment.

  # ...
  env['POAUTOINIT'] = 1
  env['LINGUAS_FILE'] = 1
  env['POTDOMAIN'] = 'foo'
  env.POUpdate()

Program()
env.Program()

Builds an executable given one or more object files or C, C++, D, or Fortran source files. If any C, C++, D or Fortran source files are specified, then they will be automatically compiled to object files using the Object builder method; see that builder method's description for a list of legal source file suffixes and how they are interpreted. The target executable file prefix, specified by the $PROGPREFIX construction variable (nothing by default), and suffix, specified by the $PROGSUFFIX construction variable (by default, .exe on Windows systems, nothing on POSIX systems), are automatically added to the target if not already present. Example:

env.Program(target='foo', source=['foo.o', 'bar.c', 'baz.f'])

ProgramAllAtOnce()
env.ProgramAllAtOnce()

Builds an executable from D sources without first creating individual objects for each file.

D sources can be compiled file-by-file as C and C++ source are, and D is integrated into the scons Object and Program builders for this model of build. D codes can though do whole source meta-programming (some of the testing frameworks do this). For this it is imperative that all sources are compiled and linked in a single call to the D compiler. This builder serves that purpose.

    env.ProgramAllAtOnce('executable', ['mod_a.d, mod_b.d', 'mod_c.d'])

This command will compile the modules mod_a, mod_b, and mod_c in a single compilation process without first creating object files for the modules. Some of the D compilers will create executable.o others will not.

RES()
env.RES()

Builds a Microsoft Visual C++ resource file. This builder method is only provided when Microsoft Visual C++ or MinGW is being used as the compiler. The .res (or .o for MinGW) suffix is added to the target name if no other suffix is given. The source file is scanned for implicit dependencies as though it were a C file. Example:

env.RES('resource.rc')

RMIC()
env.RMIC()

Builds stub and skeleton class files for remote objects from Java .class files. The target is a directory relative to which the stub and skeleton class files will be written. The source can be the names of .class files, or the objects return from the Java builder method.

If the construction variable $JAVACLASSDIR is set, either in the environment or in the call to the RMIC builder method itself, then the value of the variable will be stripped from the beginning of any .class file names.

classes = env.Java(target = 'classdir', source = 'src')
env.RMIC(target = 'outdir1', source = classes)

env.RMIC(target = 'outdir2',
         source = ['package/foo.class', 'package/bar.class'])

env.RMIC(target = 'outdir3',
         source = ['classes/foo.class', 'classes/bar.class'],
         JAVACLASSDIR = 'classes')

RPCGenClient()
env.RPCGenClient()

Generates an RPC client stub (_clnt.c) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif_clnt.c
env.RPCGenClient('src/rpcif.x')

RPCGenHeader()
env.RPCGenHeader()

Generates an RPC header (.h) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif.h
env.RPCGenHeader('src/rpcif.x')

RPCGenService()
env.RPCGenService()

Generates an RPC server-skeleton (_svc.c) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif_svc.c
env.RPCGenClient('src/rpcif.x')

RPCGenXDR()
env.RPCGenXDR()

Generates an RPC XDR routine (_xdr.c) file from a specified RPC (.x) source file. Because rpcgen only builds output files in the local directory, the command will be executed in the source file's directory by default.

# Builds src/rpcif_xdr.c
env.RPCGenClient('src/rpcif.x')

SharedLibrary()
env.SharedLibrary()

Builds a shared library (.so on a POSIX system, .dll on Windows) given one or more object files or C, C++, D or Fortran source files. If any source files are given, then they will be automatically compiled to object files. The target library file prefix, specified by the $SHLIBPREFIX construction variable (by default, lib on POSIX systems, nothing on Windows systems), and suffix, specified by the $SHLIBSUFFIX construction variable (by default, .dll on Windows systems, .so on POSIX systems), are automatically added to the target if not already present. Example:

env.SharedLibrary(target='bar', source=['bar.c', 'foo.o'])

On Windows systems, the SharedLibrary builder method will always build an import library (.lib) in addition to the shared library (.dll), adding a .lib library with the same basename if there is not already a .lib file explicitly listed in the targets.

On Cygwin systems, the SharedLibrary builder method will always build an import library (.dll.a) in addition to the shared library (.dll), adding a .dll.a library with the same basename if there is not already a .dll.a file explicitly listed in the targets.

Any object files listed in the source must have been built for a shared library (that is, using the SharedObject builder method). scons will raise an error if there is any mismatch.

On some platforms, there is a distinction between a shared library (loaded automatically by the system to resolve external references) and a loadable module (explicitly loaded by user action). For maximum portability, use the LoadableModule builder for the latter.

When the $SHLIBVERSION construction variable is defined, a versioned shared library is created. This modifies $SHLINKFLAGS as required, adds the version number to the library name, and creates any symbolic links that are needed.

env.SharedLibrary(target='bar', source=['bar.c', 'foo.o'], SHLIBVERSION='1.5.2')

On a POSIX system, versions with a single token create exactly one symlink: libbar.so.6 would have symlink libbar.so only. On a POSIX system, versions with two or more tokens create exactly two symlinks: libbar.so.2.3.1 would have symlinks libbar.so and libbar.so.2; on a Darwin (OSX) system the library would be libbar.2.3.1.dylib and the link would be libbar.dylib.

On Windows systems, specifying register=1 will cause the .dll to be registered after it is built. The command that is run is determined by the $REGSVR construction variable (regsvr32 by default), and the flags passed are determined by $REGSVRFLAGS. By default, $REGSVRFLAGS includes the /s option, to prevent dialogs from popping up and requiring user attention when it is run. If you change $REGSVRFLAGS, be sure to include the /s option. For example,

env.SharedLibrary(target='bar', source=['bar.cxx', 'foo.obj'], register=1)

will register bar.dll as a COM object when it is done linking it.

SharedObject()
env.SharedObject()

Builds an object file intended for inclusion in a shared library. Source files must have one of the same set of extensions specified above for the StaticObject builder method. On some platforms building a shared object requires additional compiler option (e.g. -fPIC for gcc) in addition to those needed to build a normal (static) object, but on some platforms there is no difference between a shared object and a normal (static) one. When there is a difference, SCons will only allow shared objects to be linked into a shared library, and will use a different suffix for shared objects. On platforms where there is no difference, SCons will allow both normal (static) and shared objects to be linked into a shared library, and will use the same suffix for shared and normal (static) objects. The target object file prefix, specified by the $SHOBJPREFIX construction variable (by default, the same as $OBJPREFIX), and suffix, specified by the $SHOBJSUFFIX construction variable, are automatically added to the target if not already present. Examples:

env.SharedObject(target='ddd', source='ddd.c')
env.SharedObject(target='eee.o', source='eee.cpp')
env.SharedObject(target='fff.obj', source='fff.for')

Note that the source files will be scanned according to the suffix mappings in the SourceFileScanner object. See the manpage section "Scanner Objects" for more information.

StaticLibrary()
env.StaticLibrary()

Builds a static library given one or more object files or C, C++, D or Fortran source files. If any source files are given, then they will be automatically compiled to object files. The static library file prefix, specified by the $LIBPREFIX construction variable (by default, lib on POSIX systems, nothing on Windows systems), and suffix, specified by the $LIBSUFFIX construction variable (by default, .lib on Windows systems, .a on POSIX systems), are automatically added to the target if not already present. Example:

env.StaticLibrary(target='bar', source=['bar.c', 'foo.o'])

Any object files listed in the source must have been built for a static library (that is, using the StaticObject builder method). scons will raise an error if there is any mismatch.

StaticObject()
env.StaticObject()

Builds a static object file from one or more C, C++, D, or Fortran source files. Source files must have one of the following extensions:

  .asm    assembly language file
  .ASM    assembly language file
  .c      C file
  .C      Windows:  C file
          POSIX:  C++ file
  .cc     C++ file
  .cpp    C++ file
  .cxx    C++ file
  .cxx    C++ file
  .c++    C++ file
  .C++    C++ file
  .d      D file
  .f      Fortran file
  .F      Windows:  Fortran file
          POSIX:  Fortran file + C pre-processor
  .for    Fortran file
  .FOR    Fortran file
  .fpp    Fortran file + C pre-processor
  .FPP    Fortran file + C pre-processor
  .m      Object C file
  .mm     Object C++ file
  .s      assembly language file
  .S      Windows:  assembly language file
          ARM: CodeSourcery Sourcery Lite
  .sx     assembly language file + C pre-processor
          POSIX:  assembly language file + C pre-processor
  .spp    assembly language file + C pre-processor
  .SPP    assembly language file + C pre-processor

The target object file prefix, specified by the $OBJPREFIX construction variable (nothing by default), and suffix, specified by the $OBJSUFFIX construction variable (.obj on Windows systems, .o on POSIX systems), are automatically added to the target if not already present. Examples:

env.StaticObject(target='aaa', source='aaa.c')
env.StaticObject(target='bbb.o', source='bbb.c++')
env.StaticObject(target='ccc.obj', source='ccc.f')

Note that the source files will be scanned according to the suffix mappings in the SourceFileScanner object. See the manpage section "Scanner Objects" for more information.

Substfile()
env.Substfile()

The Substfile builder creates a single text file from a template consisting of a file or set of files (or nodes), replacing text using the $SUBST_DICT construction variable (if set). If a set, they are concatenated into the target file using the value of the $LINESEPARATOR construction variable as a separator between contents; the separator is not emitted after the contents of the last file. Nested lists of source files are flattened. See also Textfile.

If a single source file name is specified and has a .in suffix, the suffix is stripped and the remainder of the name is used as the default target name.

The prefix and suffix specified by the $SUBSTFILEPREFIX and $SUBSTFILESUFFIX construction variables (an empty string by default in both cases) are automatically added to the target if they are not already present.

If a construction variable named $SUBST_DICT is present, it may be either a Python dictionary or a sequence of (key, value) tuples. If it is a dictionary it is converted into a list of tuples with unspecified order, so if one key is a prefix of another key or if one substitution could be further expanded by another subsitition, it is unpredictable whether the expansion will occur.

Any occurrences of a key in the source are replaced by the corresponding value, which may be a Python callable function or a string. If the value is a callable, it is called with no arguments to get a string. Strings are subst-expanded and the result replaces the key.

env = Environment(tools=['default'])

env['prefix'] = '/usr/bin'
script_dict = {'@prefix@': '/bin', '@exec_prefix@': '$prefix'}
env.Substfile('script.in', SUBST_DICT=script_dict)

conf_dict = {'%VERSION%': '1.2.3', '%BASE%': 'MyProg'}
env.Substfile('config.h.in', conf_dict, SUBST_DICT=conf_dict)

# UNPREDICTABLE - one key is a prefix of another
bad_foo = {'$foo': '$foo', '$foobar': '$foobar'}
env.Substfile('foo.in', SUBST_DICT=bad_foo)

# PREDICTABLE - keys are applied longest first
good_foo = [('$foobar', '$foobar'), ('$foo', '$foo')]
env.Substfile('foo.in', SUBST_DICT=good_foo)

# UNPREDICTABLE - one substitution could be futher expanded
bad_bar = {'@bar@': '@soap@', '@soap@': 'lye'}
env.Substfile('bar.in', SUBST_DICT=bad_bar)

# PREDICTABLE - substitutions are expanded in order
good_bar = (('@bar@', '@soap@'), ('@soap@', 'lye'))
env.Substfile('bar.in', SUBST_DICT=good_bar)

# the SUBST_DICT may be in common (and not an override)
substutions = {}
subst = Environment(tools=['textfile'], SUBST_DICT=substitutions)
substitutions['@foo@'] = 'foo'
subst['SUBST_DICT']['@bar@'] = 'bar'
subst.Substfile(
    'pgm1.c',
    [Value('#include "@foo@.h"'), Value('#include "@bar@.h"'), "common.in", "pgm1.in"],
)
subst.Substfile(
    'pgm2.c',
    [Value('#include "@foo@.h"'), Value('#include "@bar@.h"'), "common.in", "pgm2.in"],
)

Tar()
env.Tar()

Builds a tar archive of the specified files and/or directories. Unlike most builder methods, the Tar builder method may be called multiple times for a given target; each additional call adds to the list of entries that will be built into the archive. Any source directories will be scanned for changes to any on-disk files, regardless of whether or not scons knows about them from other Builder or function calls.

env.Tar('src.tar', 'src')

# Create the stuff.tar file.
env.Tar('stuff', ['subdir1', 'subdir2'])
# Also add "another" to the stuff.tar file.
env.Tar('stuff', 'another')

# Set TARFLAGS to create a gzip-filtered archive.
env = Environment(TARFLAGS = '-c -z')
env.Tar('foo.tar.gz', 'foo')

# Also set the suffix to .tgz.
env = Environment(TARFLAGS = '-c -z',
                  TARSUFFIX = '.tgz')
env.Tar('foo')

Textfile()
env.Textfile()

The Textfile builder generates a single text file from a template consisting of a list of strings, replacing text using the $SUBST_DICT construction variable (if set) - see Substfile for a description of replacement. The strings will be separated in the target file using the value of the $LINESEPARATOR construction variable; the line separator is not emitted after the last string. Nested lists of source strings are flattened. Source strings need not literally be Python strings: they can be Nodes or Python objects that convert cleanly to Value nodes

The prefix and suffix specified by the $TEXTFILEPREFIX and $TEXTFILESUFFIX construction variables (by default an empty string and .txt, respectively) are automatically added to the target if they are not already present. Examples:

# builds/writes foo.txt
env.Textfile(target='foo.txt', source=['Goethe', 42, 'Schiller'])

# builds/writes bar.txt
env.Textfile(target='bar', source=['lalala', 'tanteratei'], LINESEPARATOR='|*')

# nested lists are flattened automatically
env.Textfile(target='blob', source=['lalala', ['Goethe', 42, 'Schiller'], 'tanteratei'])

# files may be used as input by wraping them in File()
env.Textfile(
    target='concat',  # concatenate files with a marker between
    source=[File('concat1'), File('concat2')],
    LINESEPARATOR='====================\n',
)

Results:

foo.txt

  Goethe
  42
  Schiller

bar.txt

  lalala|*tanteratei

blob.txt

  lalala
  Goethe
  42
  Schiller
  tanteratei

Translate()
env.Translate()

This pseudo-builder belongs to gettext toolset. The builder extracts internationalized messages from source files, updates POT template (if necessary) and then updates PO translations (if necessary). If $POAUTOINIT is set, missing PO files will be automatically created (i.e. without translator person intervention). The variables $LINGUAS_FILE and $POTDOMAIN are taken into acount too. All other construction variables used by POTUpdate, and POUpdate work here too.

Example 1. The simplest way is to specify input files and output languages inline in a SCons script when invoking Translate

# SConscript in 'po/' directory
env = Environment( tools = ["default", "gettext"] )
env['POAUTOINIT'] = 1
env.Translate(['en','pl'], ['../a.cpp','../b.cpp'])

Example 2. If you wish, you may also stick to conventional style known from autotools, i.e. using POTFILES.in and LINGUAS files

# LINGUAS
en pl 
#end

# POTFILES.in
a.cpp
b.cpp
# end

# SConscript
env = Environment( tools = ["default", "gettext"] )
env['POAUTOINIT'] = 1
env['XGETTEXTPATH'] = ['../']
env.Translate(LINGUAS_FILE = 1, XGETTEXTFROM = 'POTFILES.in')

The last approach is perhaps the recommended one. It allows easily split internationalization/localization onto separate SCons scripts, where a script in source tree is responsible for translations (from sources to PO files) and script(s) under variant directories are responsible for compilation of PO to MO files to and for installation of MO files. The "gluing factor" synchronizing these two scripts is then the content of LINGUAS file. Note, that the updated POT and PO files are usually going to be committed back to the repository, so they must be updated within the source directory (and not in variant directories). Additionaly, the file listing of po/ directory contains LINGUAS file, so the source tree looks familiar to translators, and they may work with the project in their usual way.

Example 3. Let's prepare a development tree as below

 project/
  + SConstruct
  + build/        
  + src/
      + po/
          + SConscript
          + SConscript.i18n
          + POTFILES.in
          + LINGUAS

with build being variant directory. Write the top-level SConstruct script as follows

  # SConstruct
  env = Environment( tools = ["default", "gettext"] )
  VariantDir('build', 'src', duplicate = 0)
  env['POAUTOINIT'] = 1
  SConscript('src/po/SConscript.i18n', exports = 'env')
  SConscript('build/po/SConscript', exports = 'env')

the src/po/SConscript.i18n as

  # src/po/SConscript.i18n
  Import('env')
  env.Translate(LINGUAS_FILE=1, XGETTEXTFROM='POTFILES.in', XGETTEXTPATH=['../'])

and the src/po/SConscript

  # src/po/SConscript
  Import('env')
  env.MOFiles(LINGUAS_FILE = 1)

Such setup produces POT and PO files under source tree in src/po/ and binary MO files under variant tree in build/po/. This way the POT and PO files are separated from other output files, which must not be committed back to source repositories (e.g. MO files).

Note

In above example, the PO files are not updated, nor created automatically when you issue scons '.' command. The files must be updated (created) by hand via scons po-update and then MO files can be compiled by running scons '.'.

TypeLibrary()
env.TypeLibrary()

Builds a Windows type library (.tlb) file from an input IDL file (.idl). In addition, it will build the associated interface stub and proxy source files, naming them according to the base name of the .idl file. For example,

env.TypeLibrary(source="foo.idl")

Will create foo.tlb, foo.h, foo_i.c, foo_p.c and foo_data.c files.

Uic()
env.Uic()

Builds a header file, an implementation file and a moc file from an ui file. and returns the corresponding nodes in the that order. This builder is only available after using the tool qt. Note: you can specify .ui files directly as source files to the Program, Library and SharedLibrary builders without using this builder. Using this builder lets you override the standard naming conventions (be careful: prefixes are always prepended to names of built files; if you don't want prefixes, you may set them to ``). See the $QTDIR variable for more information. Example:

env.Uic('foo.ui')  # -> ['foo.h', 'uic_foo.cc', 'moc_foo.cc']
env.Uic(
    target=Split('include/foo.h gen/uicfoo.cc gen/mocfoo.cc'),
    source='foo.ui'
)  # -> ['include/foo.h', 'gen/uicfoo.cc', 'gen/mocfoo.cc']

Zip()
env.Zip()

Builds a zip archive of the specified files and/or directories. Unlike most builder methods, the Zip builder method may be called multiple times for a given target; each additional call adds to the list of entries that will be built into the archive. Any source directories will be scanned for changes to any on-disk files, regardless of whether or not scons knows about them from other Builder or function calls.

env.Zip('src.zip', 'src')

# Create the stuff.zip file.
env.Zip('stuff', ['subdir1', 'subdir2'])
# Also add "another" to the stuff.tar file.
env.Zip('stuff', 'another')

All targets of builder methods automatically depend on their sources. An explicit dependency can be specified using the env.Depends method of a construction environment (see below).

In addition, scons automatically scans source files for various programming languages, so the dependencies do not need to be specified explicitly. By default, SCons can C source files, C++ source files, Fortran source files with .F (POSIX systems only), .fpp, or .FPP file extensions, and assembly language files with .S (POSIX systems only), .spp, or .SPP files extensions for C preprocessor dependencies. SCons also has default support for scanning D source files, You can also write your own Scanners to add support for additional source file types. These can be added to the default Scanner object used by the Object, StaticObject and SharedObject Builders by adding them to the SourceFileScanner object. See the section called “Scanner Objects” for more information about defining your own Scanner objects and using the SourceFileScanner object.

Methods and Functions To Do Things

In addition to Builder methods, scons provides a number of other construction environment methods and global functions to manipulate the build configuration.

Usually, a construction environment method and global function with the same name both exist for convenience. In the following list, the global function is documented in this style:

Function(arguments, [optional arguments])

and the construction environment method looks like:

env.Function(arguments, [optional arguments])

If the function can be called both ways, then both forms are listed.

The global function and same-named construction environment method provide almost identical functionality, with a couple of exceptions. First, many of the construction environment methods affect only that construction environment, while the global function has a global effect. Second, where appropriate, calling the functionality through a construction environment will substitute construction variables into any supplied string arguments, while the global function doesn't have the context of a construction environment to pick variables from, so it cannot perform the substitution. For example:

Default('$FOO')

env = Environment(FOO='foo')
env.Default('$FOO')

In the above example, the call to the global Default function will add a target named $FOO to the list of default targets, while the call to the env.Default construction environment method will expand the value and add a target named foo to the list of default targets. For more on construction variable expansion, see the next section on construction variables.

Global functions may be called from custom Python modules that you import into an SConscript file by adding the following import to the Python module:

from SCons.Script import *

Construction environment methods and global functions provided by scons include:

Action(action, [output, [var, ...]] [key=value, ...])
env.Action(action, [output, [var, ...]] [key=value, ...])

A factory function to create an Action object for the specified action. See the manpage section "Action Objects" for a complete explanation of the arguments and behavior.

Note that the env.Action form of the invocation will expand construction variables in any argument strings, including the action argument, at the time it is called using the construction variables in the env construction environment through which env.Action was called. The Action global function form delays all variable expansion until the Action object is actually used.

AddMethod(object, function, [name])
env.AddMethod(function, [name])

Adds function to an object as a method. function will be called with an instance object as the first argument as for other methods. If name is given, it is used as the name of the new method, else the name of function is used.

When the global function AddMethod is called, the object to add the method to must be passed as the first argument; typically this will be Environment, in order to create a method which applies to all construction environments subsequently constructed. When called using the env.AddMethod form, the method is added to the specified construction environment only. Added methods propagate through env.Clone calls.

More examples:

# Function to add must accept an instance argument.
# The Python convention is to call this 'self'.
def my_method(self, arg):
    print("my_method() got", arg)

# Use the global function to add a method to the Environment class:
AddMethod(Environment, my_method)
env = Environment()
env.my_method('arg')

# Use the optional name argument to set the name of the method:
env.AddMethod(my_method, 'other_method_name')
env.other_method_name('another arg')

AddOption(arguments)

Adds a local (project-specific) command-line option. arguments are the same as those supported by the add_option method in the standard Python library module optparse, with a few additional capabilities noted below. See the documentation for optparse for a thorough discussion of its option-processing capabities.

In addition to the arguments and values supported by the optparse add_option method, AddOption allows setting the nargs keyword value to a string consisting of a question mark ('?') to indicate that the option argument for that option string is optional. If the option string is present on the command line but has no matching option argument, the value of the const keyword argument is produced as the value of the option. If the option string is omitted from the command line, the value of the default keyword argument is produced, as usual; if there is no default keyword argument in the AddOption call, None is produced.

optparse recognizes abbreviations of long option names, as long as they can be unambiguously resolved. For example, if add_option is called to define a --devicename option, it will recognize --device, --dev and so forth as long as there is no other option which could also match to the same abbreviation. Options added via AddOption do not support the automatic recognition of abbreviations. Instead, to allow specific abbreviations, include them as synonyms in the AddOption call itself.

Once a new command-line option has been added with AddOption, the option value may be accessed using GetOption or env.GetOption. SetOption is not currently supported for options added with AddOption.

Help text for an option is a combination of the string supplied in the help keyword argument to AddOption and information collected from the other keyword arguments. Such help is displayed if the -h command line option is used (but not with -H). Help for all local options is displayed under the separate heading Local Options. The options are unsorted - they will appear in the help text in the order in which the AddOption calls occur.

Example:

AddOption(
    '--prefix',
    dest='prefix',
    nargs=1,
    type='string',
    action='store',
    metavar='DIR',
    help='installation prefix',
)
env = Environment(PREFIX=GetOption('prefix'))

For that example, the following help text would be produced:

Local Options:
  --prefix=DIR                installation prefix

Help text for local options may be unavailable if the Help function has been called, see the Help documentation for details.

Note

As an artifact of the internal implementation, the behavior of options added by AddOption which take option arguments is undefined if whitespace (rather than an = sign) is used as the separator on the command line. Users should avoid such usage; it is recommended to add a note to this effect to project documentation if the situation is likely to arise. In addition, if the nargs keyword is used to specify more than one following option argument (that is, with a value of 2 or greater), such arguments would necessarily be whitespace separated, triggering the issue. Developers should not use AddOption this way. Future versions of SCons will likely forbid such usage.

AddPostAction(target, action)
env.AddPostAction(target, action)

Arranges for the specified action to be performed after the specified target has been built. The specified action(s) may be an Action object, or anything that can be converted into an Action object See the manpage section "Action Objects" for a complete explanation.

When multiple targets are supplied, the action may be called multiple times, once after each action that generates one or more targets in the list.

AddPreAction(target, action)
env.AddPreAction(target, action)

Arranges for the specified action to be performed before the specified target is built. The specified action(s) may be an Action object, or anything that can be converted into an Action object See the manpage section "Action Objects" for a complete explanation.

When multiple targets are specified, the action(s) may be called multiple times, once before each action that generates one or more targets in the list.

Note that if any of the targets are built in multiple steps, the action will be invoked just before the "final" action that specifically generates the specified target(s). For example, when building an executable program from a specified source .c file via an intermediate object file:

foo = Program('foo.c')
AddPreAction(foo, 'pre_action')

The specified pre_action would be executed before scons calls the link command that actually generates the executable program binary foo, not before compiling the foo.c file into an object file.

Alias(alias, [targets, [action]])
env.Alias(alias, [targets, [action]])

Creates one or more phony targets that expand to one or more other targets. An optional action (command) or list of actions can be specified that will be executed whenever the any of the alias targets are out-of-date. Returns the Node object representing the alias, which exists outside of any file system. This Node object, or the alias name, may be used as a dependency of any other target, including another alias. Alias can be called multiple times for the same alias to add additional targets to the alias, or additional actions to the list for this alias. Aliases are global even if set through the construction environment method.

Examples:

Alias('install')
Alias('install', '/usr/bin')
Alias(['install', 'install-lib'], '/usr/local/lib')

env.Alias('install', ['/usr/local/bin', '/usr/local/lib'])
env.Alias('install', ['/usr/local/man'])

env.Alias('update', ['file1', 'file2'], "update_database $SOURCES")

AllowSubstExceptions([exception, ...])

Specifies the exceptions that will be allowed when expanding construction variables. By default, any construction variable expansions that generate a NameError or IndexError exception will expand to a '' (an empty string) and not cause scons to fail. All exceptions not in the specified list will generate an error message and terminate processing.

If AllowSubstExceptions is called multiple times, each call completely overwrites the previous list of allowed exceptions.

Example:

# Requires that all construction variable names exist.
# (You may wish to do this if you want to enforce strictly
# that all construction variables must be defined before use.)
AllowSubstExceptions()

# Also allow a string containing a zero-division expansion
# like '${1 / 0}' to evalute to ''.
AllowSubstExceptions(IndexError, NameError, ZeroDivisionError)

AlwaysBuild(target, ...)
env.AlwaysBuild(target, ...)

Marks each given target so that it is always assumed to be out of date, and will always be rebuilt if needed. Note, however, that AlwaysBuild does not add its target(s) to the default target list, so the targets will only be built if they are specified on the command line, or are a dependent of a target specified on the command line--but they will always be built if so specified. Multiple targets can be passed in to a single call to AlwaysBuild.

env.Append(key=val, [...])

Intelligently append values to construction variables in the construction environment named by env. The construction variables and values to add to them are passed as key=val pairs (Python keyword arguments). env.Append is designed to allow adding values without normally having to know the data type of an existing construction variable. Regular Python syntax can also be used to manipulate the construction variable, but for that you must know the type of the construction variable: for example, different Python syntax is needed to combine a list of values with a single string value, or vice versa. Some pre-defined construction variables do have type expectations based on how SCons will use them, for example $CPPDEFINES is normally a string or a list of strings, but can be a string, a list of strings, a list of tuples, or a dictionary, while $LIBEMITTER would expect a callable or list of callables, and $BUILDERS would expect a mapping type. Consult the documentation for the various construction variables for more details.

The following descriptions apply to both the append and prepend functions, the only difference being the insertion point of the added values.

If env. does not have a construction variable indicated by key, val is added to the environment under that key as-is.

val can be almost any type, and SCons will combine it with an existing value into an appropriate type, but there are a few special cases to be aware of. When two strings are combined, the result is normally a new string, with the caller responsible for supplying any needed separation. The exception to this is the construction variable $CPPDEFINES, in which each item will be postprocessed by adding a prefix and/or suffix, so the contents are treated as a list of strings, that is, adding a string will result in a separate string entry, not a combined string. For $CPPDEFINES as well as for $LIBS, and the various *PATH; variables, SCons will supply the compiler-specific syntax (e.g. adding a -D or /D prefix for $CPPDEFINES), so this syntax should be omitted when adding values to these variables. Example (gcc syntax shown in the expansion of CPPDEFINES):

env = Environment(CXXFLAGS="-std=c11", CPPDEFINES="RELEASE")
print("CXXFLAGS={}, CPPDEFINES={}".format(env['CXXFLAGS'], env['CPPDEFINES']))
# notice including a leading space in CXXFLAGS value
env.Append(CXXFLAGS=" -O", CPPDEFINES="EXTRA")
print("CXXFLAGS={}, CPPDEFINES={}".format(env['CXXFLAGS'], env['CPPDEFINES']))
print("CPPDEFINES will expand to {}".format(env.subst("$_CPPDEFFLAGS")))

$ scons -Q
CXXFLAGS=-std=c11, CPPDEFINES=RELEASE
CXXFLAGS=-std=c11 -O, CPPDEFINES=['RELEASE', 'EXTRA']
CPPDEFINES will expand to -DRELEASE -DEXTRA
scons: `.' is up to date.

Because $CPPDEFINES is intended to describe C/C++ pre-processor macro definitions, it accepts additional syntax. Preprocessor macros can be valued, or un-valued, as in -DBAR=1 or -DFOO. The macro can be be supplied as a complete string including the value, or as a tuple (or list) of macro, value, or as a dictionary. Example (again gcc syntax in the expanded defines):

env = Environment(CPPDEFINES="FOO")
print("CPPDEFINES={}".format(env['CPPDEFINES']))
env.Append(CPPDEFINES="BAR=1")
print("CPPDEFINES={}".format(env['CPPDEFINES']))
env.Append(CPPDEFINES=("OTHER", 2))
print("CPPDEFINES={}".format(env['CPPDEFINES']))
env.Append(CPPDEFINES={"EXTRA": "arg"})
print("CPPDEFINES={}".format(env['CPPDEFINES']))
print("CPPDEFINES will expand to {}".format(env.subst("$_CPPDEFFLAGS")))

$ scons -Q
CPPDEFINES=FOO
CPPDEFINES=['FOO', 'BAR=1']
CPPDEFINES=['FOO', 'BAR=1', ('OTHER', 2)]
CPPDEFINES=['FOO', 'BAR=1', ('OTHER', 2), {'EXTRA': 'arg'}]
CPPDEFINES will expand to -DFOO -DBAR=1 -DOTHER=2 -DEXTRA=arg
scons: `.' is up to date.

Adding a string val to a dictonary construction variable will enter val as the key in the dict, and None as its value. Using a tuple type to supply a key + value only works for the special case of $CPPDEFINES described above.

Although most combinations of types work without needing to know the details, some combinations do not make sense and a Python exception will be raised.

When using env.Append to modify construction variables which are path specifications (conventionally, the names of such end in PATH), it is recommended to add the values as a list of strings, even if there is only a single string to add. The same goes for adding library names to $LIBS.

env.Append(CPPPATH=["#/include"])

env.AppendENVPath(name, newpath, [envname, sep, delete_existing=False])

Append path elements specified by newpath to the given search path string or list name in mapping envname in the construction environment. Supplying envname is optional: the default is the execution environment $ENV. Optional sep is used as the search path separator, the default is the platform's separator (os.pathsep). A path element will only appear once. Any duplicates in newpath are dropped, keeping the last appearing (to preserve path order). If delete_existing is False (the default) any addition duplicating an existing path element is ignored; if delete_existing is True the existing value will be dropped and the path element will be added at the end. To help maintain uniqueness all paths are normalized (using os.path.normpath and os.path.normcase).

Example:

print('before:', env['ENV']['INCLUDE'])
include_path = '/foo/bar:/foo'
env.AppendENVPath('INCLUDE', include_path)
print('after:', env['ENV']['INCLUDE'])

Yields:

before: /foo:/biz
after: /biz:/foo/bar:/foo

Query name	Command-line options	Notes
`cache_debug`	`--cache-debug`
`cache_disable`	`--cache-disable`, `--no-cache`
`cache_force`	`--cache-force`, `--cache-populate`
`cache_readonly`	`--cache-readonly`
`cache_show`	`--cache-show`
`clean`	`-c`, `--clean`, `--remove`
`climb_up`	`-D` `-U` `-u` `--up` `--search_up`
`config`	`--config`
`debug`	`--debug`
`directory`	`-C`, `--directory`
`diskcheck`	`--diskcheck`
`duplicate`	`--duplicate`
`enable_virtualenv`	`--enable-virtualenv`
`experimental`	`--experimental`	since 4.2
`file`	`-f`, `--file`, `--makefile`, `--sconstruct`
`hash_format`	`--hash-format`	since 4.2
`help`	`-h`, `--help`
`ignore_errors`	`-i`, `--ignore-errors`
`ignore_virtualenv`	`--ignore-virtualenv`
`implicit_cache`	`--implicit-cache`
`implicit_deps_changed`	`--implicit-deps-changed`
`implicit_deps_unchanged`	`--implicit-deps-unchanged`
`include_dir`	`-I`, `--include-dir`
`install_sandbox`	`--install-sandbox`	Available only if the `install` tool has been called
`keep_going`	`-k`, `--keep-going`
`max_drift`	`--max-drift`
`md5_chunksize`	`--hash-chunksize`, `--md5-chunksize`	`--hash-chunksize` since 4.2
`no_exec`	`-n`, `--no-exec`, `--just-print`, `--dry-run`, `--recon`
`no_progress`	`-Q`
`num_jobs`	`-j`, `--jobs`
`package_type`	`--package-type`	Available only if the `packaging` tool has been called
`profile_file`	`--profile`
`question`	`-q`, `--question`
`random`	`--random`
`repository`	`-Y`, `--repository`, `--srcdir`
`silent`	`-s`, `--silent`, `--quiet`
`site_dir`	`--site-dir`, `--no-site-dir`
`stack_size`	`--stack-size`
`taskmastertrace_file`	`--taskmastertrace`
`tree_printers`	`--tree`
`warn`	`--warn`, `--warning`

Settable name	Command-line options	Notes
`clean`	`-c`, `--clean`, `--remove`
`diskcheck`	`--diskcheck`
`duplicate`	`--duplicate`
`experimental`	`--experimental`	since 4.2
`hash_chunksize`	`--hash-chunksize`	Actually sets `md5_chunksize`. since 4.2
`hash_format`	`--hash-format`	since 4.2
`help`	`-h`, `--help`
`implicit_cache`	`--implicit-cache`
`implicit_deps_changed`	`--implicit-deps-changed`	Also sets `implicit_cache`. (settable since 4.2)
`implicit_deps_unchanged`	`--implicit-deps-unchanged`	Also sets `implicit_cache`. (settable since 4.2)
`max_drift`	`--max-drift`
`md5_chunksize`	`--md5-chunksize`
`no_exec`	`-n`, `--no-exec`, `--just-print`, `--dry-run`, `--recon`
`no_progress`	`-Q`	See ^[a]
`num_jobs`	`-j`, `--jobs`
`random`	`--random`
`silent`	`-s`, `--silent`, `--quiet`
`stack_size`	`--stack-size`
`warn`	`--warn`
^[a]If `no_progress` is set via `SetOption` in an SConscript file (but not if set in a `site_init.py` file) there will still be an initial status message about reading SConscript files since SCons has to start reading them before it can see the `SetOption`.

SConscript Variables

In addition to the global functions and methods, scons supports a number of variables that can be used in SConscript files to affect how you want the build to be performed.

ARGLIST

A list of the keyword=value arguments specified on the command line. Each element in the list is a tuple containing the argument. The separate keyword and value elements of the tuple can be accessed by subscripting for elements [0] and [1] of the tuple, or, more readably, by using tuple unpacking. Example:

print("first keyword, value =", ARGLIST[0][0], ARGLIST[0][1])
print("second keyword, value =", ARGLIST[1][0], ARGLIST[1][1])
key, value = ARGLIST[2]
print("third keyword, value =", key, value)
for key, value in ARGLIST:
    # process key and value

ARGUMENTS

A dictionary of all the keyword=value arguments specified on the command line. The dictionary is not in order, and if a given keyword has more than one value assigned to it on the command line, the last (right-most) value is the one in the ARGUMENTS dictionary.

Example:

if ARGUMENTS.get('debug', 0):
    env = Environment(CCFLAGS='-g')
else:
    env = Environment()

BUILD_TARGETS

A list of the targets which scons has been asked to build. The contents will be either those targets listed on the command line, or, if none, those targets set via calls to the Default function. It does not contain any dependent targets that scons selects for building as a result of making the sure the specified targets are up to date, if those targets did not appear on the command line. The list is empty if neither command line targets or Default calls are present.

The elements of this list may be strings or nodes, so you should run the list through the Python str function to make sure any Node path names are converted to strings.

Because this list may be taken from the list of targets specified using the Default function, the contents of the list may change on each successive call to Default. See the DEFAULT_TARGETS list, below, for additional information.

Example:

if 'foo' in BUILD_TARGETS:
    print("Don't forget to test the `foo' program!")
if 'special/program' in BUILD_TARGETS:
    SConscript('special')

COMMAND_LINE_TARGETS

A list of the targets explicitly specified on the command line. If there are command line targets, this list will have the same contents as BUILD_TARGETS. If there are no targets specified on the command line, the list is empty. The elements of this list are strings. This can be used, for example, to take specific actions only when certain targets are explicitly being built.

Example:

if 'foo' in COMMAND_LINE_TARGETS:
    print("Don't forget to test the `foo' program!")
if 'special/program' in COMMAND_LINE_TARGETS:
    SConscript('special')

DEFAULT_TARGETS

A list of the target nodes that have been specified using the Default function. If there are no command line targets, this list will have the same contents as BUILD_TARGETS. Since the elements of the list are nodes, you need to call the Python str function on them to get the path name for each Node.

Example:

print(str(DEFAULT_TARGETS[0]))
if 'foo' in [str(t) for t in DEFAULT_TARGETS]:
    print("Don't forget to test the `foo' program!")

The contents of the DEFAULT_TARGETS list change on on each successive call to the Default function:

print([str(t) for t in DEFAULT_TARGETS])   # originally []
Default('foo')
print([str(t) for t in DEFAULT_TARGETS])   # now a node ['foo']
Default('bar')
print([str(t) for t in DEFAULT_TARGETS])   # now a node ['foo', 'bar']
Default(None)
print([str(t) for t in DEFAULT_TARGETS])   # back to []

Consequently, be sure to use DEFAULT_TARGETS only after you've made all of your Default() calls, or else simply be careful of the order of these statements in your SConscript files so that you don't look for a specific default target before it's actually been added to the list.

These variables may be accessed from custom Python modules that you import into an SConscript file by adding the following to the Python module:

from SCons.Script import *

Construction Variables

A construction environment has an associated dictionary of construction variables that are used by built-in or user-supplied build rules. Construction variable naming must follow the same rules as Python identifier naming: the initial character must be an underscore or letter, followed by any number of underscores, letters, or digits. A construction environment is not a Python dictionary itself, but it can be indexed like one to access a construction variable:

env["CC"] = "cc"
flags = env.get("CPPDEFINES", [])

Construction variables can also be retrieved and set by using the Dictionary method of the construction environment to create an actual dictionary:

cvars = env.Dictionary()
cvars["CC"] = "cc"

Construction variables can also be passed to the construction environment constructor:

env = Environment(CC="cc")

or when copying a construction environment using the Clone method:

env2 = env.Clone(CC="cl.exe")

Construction variables can also be supplied as keyword arguments to a builder, in which case those settings affect only the work done by that builder call, and not the construction environment as a whole. This concept is called an override:

env.Program('hello', 'hello.c', LIBS=['gl', 'glut'])

A number of useful construction variables are automatically defined by scons for each supported platform, and you can modify these or define any additional construction variables for your own use, taking care not to overwrite ones which SCons is using. The following is a list of the possible automatically defined construction variables.

Note the actual list available at execution time will never include all of these, as the ones detected as not being useful (wrong platform, necessary external command or files not installed, etc.) will not be set up. Correct build setups should be resilient to the possible absence of certain construction variables before using them, for example by using a Python dictionary get method to retrieve the value and taking alternative action if the return indicates the variable is unset. The env.Dump method can be called to examine the construction variables set in a particular environment.

__LDMODULEVERSIONFLAGS

This construction variable automatically introduces $_LDMODULEVERSIONFLAGS if $LDMODULEVERSION is set. Othervise it evaluates to an empty string.

__SHLIBVERSIONFLAGS

This construction variable automatically introduces $_SHLIBVERSIONFLAGS if $SHLIBVERSION is set. Othervise it evaluates to an empty string.

APPLELINK_COMPATIBILITY_VERSION

On Mac OS X this is used to set the linker flag: -compatibility_version

The value is specified as X[.Y[.Z]] where X is between 1 and 65535, Y can be omitted or between 1 and 255, Z can be omitted or between 1 and 255. This value will be derived from $SHLIBVERSION if not specified. The lowest digit will be dropped and replaced by a 0.

If the $APPLELINK_NO_COMPATIBILITY_VERSION is set then no -compatibility_version will be output.

See MacOS's ld manpage for more details

_APPLELINK_COMPATIBILITY_VERSION

A macro (by default a generator function) used to create the linker flags to specify apple's linker's -compatibility_version flag. The default generator uses $APPLELINK_COMPATIBILITY_VERSION and $APPLELINK_NO_COMPATIBILITY_VERSION and $SHLIBVERSION to determine the correct flag.

APPLELINK_CURRENT_VERSION

On Mac OS X this is used to set the linker flag: -current_version

The value is specified as X[.Y[.Z]] where X is between 1 and 65535, Y can be omitted or between 1 and 255, Z can be omitted or between 1 and 255. This value will be set to $SHLIBVERSION if not specified.

If the $APPLELINK_NO_CURRENT_VERSION is set then no -current_version will be output.

See MacOS's ld manpage for more details

_APPLELINK_CURRENT_VERSION

A macro (by default a generator function) used to create the linker flags to specify apple's linker's -current_version flag. The default generator uses $APPLELINK_CURRENT_VERSION and $APPLELINK_NO_CURRENT_VERSION and $SHLIBVERSION to determine the correct flag.

APPLELINK_NO_COMPATIBILITY_VERSION

Set this to any True (1|True|non-empty string) value to disable adding -compatibility_version flag when generating versioned shared libraries.

This overrides $APPLELINK_COMPATIBILITY_VERSION.

APPLELINK_NO_CURRENT_VERSION

Set this to any True (1|True|non-empty string) value to disable adding -current_version flag when generating versioned shared libraries.

This overrides $APPLELINK_CURRENT_VERSION.

AR

The static library archiver.

ARCHITECTURE

Specifies the system architecture for which the package is being built. The default is the system architecture of the machine on which SCons is running. This is used to fill in the Architecture: field in an Ipkg control file, and the BuildArch: field in the RPM .spec file, as well as forming part of the name of a generated RPM package file.

See the Package builder.

ARCOM

The command line used to generate a static library from object files.

ARCOMSTR

The string displayed when a static library is generated from object files. If this is not set, then $ARCOM (the command line) is displayed.

env = Environment(ARCOMSTR = "Archiving $TARGET")

ARFLAGS

General options passed to the static library archiver.

AS

The assembler.

ASCOM

The command line used to generate an object file from an assembly-language source file.

ASCOMSTR

The string displayed when an object file is generated from an assembly-language source file. If this is not set, then $ASCOM (the command line) is displayed.

env = Environment(ASCOMSTR = "Assembling $TARGET")

ASFLAGS

General options passed to the assembler.

ASPPCOM

The command line used to assemble an assembly-language source file into an object file after first running the file through the C preprocessor. Any options specified in the $ASFLAGS and $CPPFLAGS construction variables are included on this command line.

ASPPCOMSTR

The string displayed when an object file is generated from an assembly-language source file after first running the file through the C preprocessor. If this is not set, then $ASPPCOM (the command line) is displayed.

env = Environment(ASPPCOMSTR = "Assembling $TARGET")

ASPPFLAGS

General options when an assembling an assembly-language source file into an object file after first running the file through the C preprocessor. The default is to use the value of $ASFLAGS.

BIBTEX

The bibliography generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

BIBTEXCOM

The command line used to call the bibliography generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

BIBTEXCOMSTR

The string displayed when generating a bibliography for TeX or LaTeX. If this is not set, then $BIBTEXCOM (the command line) is displayed.

env = Environment(BIBTEXCOMSTR = "Generating bibliography $TARGET")

BIBTEXFLAGS

General options passed to the bibliography generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

BUILDERS

A dictionary mapping the names of the builders available through the construction environment to underlying Builder objects. Custom builders need to be added to this to make them available.

A platform-dependent default list of builders such as Program, Library etc. is used to populate this construction variable when the construction environment is initialized via the presence/absence of the tools those builders depend on. $BUILDERS can be examined to learn which builders will actually be available at run-time.

Note that if you initialize this construction variable through assignment when the construction environment is created, that value for $BUILDERS will override any defaults:

bld = Builder(action='foobuild < $SOURCE > $TARGET')
env = Environment(BUILDERS={'NewBuilder': bld})

To instead use a new Builder object in addition to the default Builders, add your new Builder object like this:

env = Environment()
env.Append(BUILDERS={'NewBuilder': bld})

or this:

env = Environment()
env['BUILDERS']['NewBuilder'] = bld

CACHEDIR_CLASS

The class type that SCons should use when instantiating a new CacheDir for the given environment. It must be a subclass of the SCons.CacheDir.CacheDir class.

CC

The C compiler.

CCCOM

The command line used to compile a C source file to a (static) object file. Any options specified in the $CFLAGS, $CCFLAGS and $CPPFLAGS construction variables are included on this command line. See also $SHCCCOM for compiling to shared objects.

CCCOMSTR

If set, the string displayed when a C source file is compiled to a (static) object file. If not set, then $CCCOM (the command line) is displayed. See also $SHCCCOMSTR for compiling to shared objects.

env = Environment(CCCOMSTR = "Compiling static object $TARGET")

CCDEPFLAGS

Options to pass to C or C++ compiler to generate list of dependency files.

This is set only by compilers which support this functionality. (gcc, clang, and msvc currently)

CCFLAGS

General options that are passed to the C and C++ compilers. See also $SHCCFLAGS for compiling to shared objects.

CCPCHFLAGS

Options added to the compiler command line to support building with precompiled headers. The default value expands expands to the appropriate Microsoft Visual C++ command-line options when the $PCH construction variable is set.

CCPDBFLAGS

Options added to the compiler command line to support storing debugging information in a Microsoft Visual C++ PDB file. The default value expands expands to appropriate Microsoft Visual C++ command-line options when the $PDB construction variable is set.

The Visual C++ compiler option that SCons uses by default to generate PDB information is /Z7. This works correctly with parallel (-j) builds because it embeds the debug information in the intermediate object files, as opposed to sharing a single PDB file between multiple object files. This is also the only way to get debug information embedded into a static library. Using the /Zi instead may yield improved link-time performance, although parallel builds will no longer work.

You can generate PDB files with the /Zi switch by overriding the default $CCPDBFLAGS variable as follows:

env['CCPDBFLAGS'] = ['${(PDB and "/Zi /Fd%s" % File(PDB)) or ""}']

An alternative would be to use the /Zi to put the debugging information in a separate .pdb file for each object file by overriding the $CCPDBFLAGS variable as follows:

env['CCPDBFLAGS'] = '/Zi /Fd${TARGET}.pdb'

CCVERSION

The version number of the C compiler. This may or may not be set, depending on the specific C compiler being used.

CFILESUFFIX

The suffix for C source files. This is used by the internal CFile builder when generating C files from Lex (.l) or YACC (.y) input files. The default suffix, of course, is .c (lower case). On case-insensitive systems (like Windows), SCons also treats .C (upper case) files as C files.

CFLAGS

General options that are passed to the C compiler (C only; not C++). See also $SHCFLAGS for compiling to shared objects.

CHANGE_SPECFILE

A hook for modifying the file that controls the packaging build (the .spec for RPM, the control for Ipkg, the .wxs for MSI). If set, the function will be called after the SCons template for the file has been written.

See the Package builder.

CHANGED_SOURCES

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

CHANGED_TARGETS

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

CHANGELOG

The name of a file containing the change log text to be included in the package. This is included as the %changelog section of the RPM .spec file.

See the Package builder.

COMPILATIONDB_COMSTR

The string displayed when the CompilationDatabase builder's action is run.

COMPILATIONDB_PATH_FILTER

A string which instructs CompilationDatabase to only include entries where the output member matches the pattern in the filter string using fnmatch, which uses glob style wildcards.

The default value is an empty string '', which disables filtering.

COMPILATIONDB_USE_ABSPATH

A boolean flag to instruct CompilationDatabase whether to write the file and output members in the compilation database using absolute or relative paths.

The default value is False (use relative paths)

_concat

A function used to produce variables like $_CPPINCFLAGS. It takes four mandatory arguments, and up to 4 additional optional arguments: 1) a prefix to concatenate onto each element, 2) a list of elements, 3) a suffix to concatenate onto each element, 4) an environment for variable interpolation, 5) an optional function that will be called to transform the list before concatenation, 6) an optionally specified target (Can use TARGET), 7) an optionally specified source (Can use SOURCE), 8) optional affect_signature flag which will wrap non-empty returned value with $( and $) to indicate the contents should not affect the signature of the generated command line.

        env['_CPPINCFLAGS'] = '${_concat(INCPREFIX, CPPPATH, INCSUFFIX, __env__, RDirs, TARGET, SOURCE, affect_signature=False)}'

CONFIGUREDIR

The name of the directory in which Configure context test files are written. The default is .sconf_temp in the top-level directory containing the SConstruct file.

CONFIGURELOG

The name of the Configure context log file. The default is config.log in the top-level directory containing the SConstruct file.

_CPPDEFFLAGS

An automatically-generated construction variable containing the C preprocessor command-line options to define values. The value of $_CPPDEFFLAGS is created by respectively prepending and appending $CPPDEFPREFIX and $CPPDEFSUFFIX to each definition in $CPPDEFINES.

CPPDEFINES

A platform independent specification of C preprocessor macro definitions. The definitions will be added to command lines through the automatically-generated $_CPPDEFFLAGS construction variable (see above), which is constructed according to the type of value of $CPPDEFINES:

If $CPPDEFINES is a string, the values of the $CPPDEFPREFIX and $CPPDEFSUFFIX construction variables will be respectively prepended and appended to each definition in $CPPDEFINES.

# Will add -Dxyz to POSIX compiler command lines,
# and /Dxyz to Microsoft Visual C++ command lines.
env = Environment(CPPDEFINES='xyz')

If $CPPDEFINES is a list, the values of the $CPPDEFPREFIX and $CPPDEFSUFFIX construction variables will be respectively prepended and appended to each element in the list. If any element is a list or tuple, then the first item is the name being defined and the second item is its value:

# Will add -DB=2 -DA to POSIX compiler command lines,
# and /DB=2 /DA to Microsoft Visual C++ command lines.
env = Environment(CPPDEFINES=[('B', 2), 'A'])

If $CPPDEFINES is a dictionary, the values of the $CPPDEFPREFIX and $CPPDEFSUFFIX construction variables will be respectively prepended and appended to each item from the dictionary. The key of each dictionary item is a name being defined to the dictionary item's corresponding value; if the value is None, then the name is defined without an explicit value. Note that the resulting flags are sorted by keyword to ensure that the order of the options on the command line is consistent each time scons is run.

# Will add -DA -DB=2 to POSIX compiler command lines,
# and /DA /DB=2 to Microsoft Visual C++ command lines.
env = Environment(CPPDEFINES={'B':2, 'A':None})

CPPDEFPREFIX

The prefix used to specify preprocessor macro definitions on the C compiler command line. This will be prepended to each definition in the $CPPDEFINES construction variable when the $_CPPDEFFLAGS variable is automatically generated.

CPPDEFSUFFIX

The suffix used to specify preprocessor macro definitions on the C compiler command line. This will be appended to each definition in the $CPPDEFINES construction variable when the $_CPPDEFFLAGS variable is automatically generated.

CPPFLAGS

User-specified C preprocessor options. These will be included in any command that uses the C preprocessor, including not just compilation of C and C++ source files via the $CCCOM, $SHCCCOM, $CXXCOM and $SHCXXCOM command lines, but also the $FORTRANPPCOM, $SHFORTRANPPCOM, $F77PPCOM and $SHF77PPCOM command lines used to compile a Fortran source file, and the $ASPPCOM command line used to assemble an assembly language source file, after first running each file through the C preprocessor. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $CPPPATH. See $_CPPINCFLAGS, below, for the variable that expands to those options.

_CPPINCFLAGS

An automatically-generated construction variable containing the C preprocessor command-line options for specifying directories to be searched for include files. The value of $_CPPINCFLAGS is created by respectively prepending and appending $INCPREFIX and $INCSUFFIX to each directory in $CPPPATH.

CPPPATH

The list of directories that the C preprocessor will search for include directories. The C/C++ implicit dependency scanner will search these directories for include files. In general it's not advised to put include directory directives directly into $CCFLAGS or $CXXFLAGS as the result will be non-portable and the directories will not be searched by the dependency scanner. $CPPPATH should be a list of path strings, or a single string, not a pathname list joined by Python's os.sep.

Note: directory names in $CPPPATH will be looked-up relative to the directory of the SConscript file when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use the # prefix:

env = Environment(CPPPATH='#/include')

The directory look-up can also be forced using the Dir function:

include = Dir('include')
env = Environment(CPPPATH=include)

The directory list will be added to command lines through the automatically-generated $_CPPINCFLAGS construction variable, which is constructed by respectively prepending and appending the values of the $INCPREFIX and $INCSUFFIX construction variables to each directory in $CPPPATH. Any command lines you define that need the $CPPPATH directory list should include $_CPPINCFLAGS:

env = Environment(CCCOM="my_compiler $_CPPINCFLAGS -c -o $TARGET $SOURCE")

CPPSUFFIXES

The list of suffixes of files that will be scanned for C preprocessor implicit dependencies (#include lines). The default list is:

[".c", ".C", ".cxx", ".cpp", ".c++", ".cc",
 ".h", ".H", ".hxx", ".hpp", ".hh",
 ".F", ".fpp", ".FPP",
 ".m", ".mm",
 ".S", ".spp", ".SPP"]

CXX

The C++ compiler. See also $SHCXX for compiling to shared objects..

CXXCOM

The command line used to compile a C++ source file to an object file. Any options specified in the $CXXFLAGS and $CPPFLAGS construction variables are included on this command line. See also $SHCXXCOM for compiling to shared objects..

CXXCOMSTR

If set, the string displayed when a C++ source file is compiled to a (static) object file. If not set, then $CXXCOM (the command line) is displayed. See also $SHCXXCOMSTR for compiling to shared objects..

env = Environment(CXXCOMSTR = "Compiling static object $TARGET")

CXXFILESUFFIX

The suffix for C++ source files. This is used by the internal CXXFile builder when generating C++ files from Lex (.ll) or YACC (.yy) input files. The default suffix is .cc. SCons also treats files with the suffixes .cpp, .cxx, .c++, and .C++ as C++ files, and files with .mm suffixes as Objective C++ files. On case-sensitive systems (Linux, UNIX, and other POSIX-alikes), SCons also treats .C (upper case) files as C++ files.

CXXFLAGS

General options that are passed to the C++ compiler. By default, this includes the value of $CCFLAGS, so that setting $CCFLAGS affects both C and C++ compilation. If you want to add C++-specific flags, you must set or override the value of $CXXFLAGS. See also $SHCXXFLAGS for compiling to shared objects..

CXXVERSION

The version number of the C++ compiler. This may or may not be set, depending on the specific C++ compiler being used.

DC

The D compiler to use. See also $SHDC for compiling to shared objects.

DCOM

The command line used to compile a D file to an object file. Any options specified in the $DFLAGS construction variable is included on this command line. See also $SHDCOM for compiling to shared objects.

DCOMSTR

If set, the string displayed when a D source file is compiled to a (static) object file. If not set, then $DCOM (the command line) is displayed. See also $SHDCOMSTR for compiling to shared objects.

DDEBUG

List of debug tags to enable when compiling.

DDEBUGPREFIX

DDEBUGPREFIX.

DDEBUGSUFFIX

DDEBUGSUFFIX.

DESCRIPTION

A long description of the project being packaged. This is included in the relevant section of the file that controls the packaging build.

See the Package builder.

DESCRIPTION_lang

A language-specific long description for the specified lang. This is used to populate a %description -l section of an RPM .spec file.

See the Package builder.

DFILESUFFIX

DFILESUFFIX.

DFLAGPREFIX

DFLAGPREFIX.

DFLAGS

General options that are passed to the D compiler.

DFLAGSUFFIX.

DINCPREFIX.

DLIBFLAGSUFFIX.

A function that converts a string into a Dir instance relative to the target being built.

Dirs

A function that converts a list of strings into a list of Dir instances relative to the target being built.

DLIB

Name of the lib tool to use for D codes.

DLIBCOM

The command line to use when creating libraries.

DLIBLINKPREFIX.

DLIBLINKSUFFIX.

DLIBFLAGPREFIX.

DLIBFLAGSUFFIX.

DLIBLINKPREFIX.

DLIBLINKSUFFIX.

Name of the linker to use for linking systems including D sources. See also $SHDLINK for linking shared objects.

DLINKCOM

The command line to use when linking systems including D sources. See also $SHDLINKCOM for linking shared objects.

DLINKFLAGPREFIX

DLINKFLAGPREFIX.

DLINKFLAGS

List of linker flags. See also $SHDLINKFLAGS for linking shared objects.

DLINKFLAGSUFFIX

DLINKFLAGSUFFIX.

DOCBOOK_DEFAULT_XSL_EPUB

The default XSLT file for the DocbookEpub builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_HTML

The default XSLT file for the DocbookHtml builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_HTMLCHUNKED

The default XSLT file for the DocbookHtmlChunked builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_HTMLHELP

The default XSLT file for the DocbookHtmlhelp builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_MAN

The default XSLT file for the DocbookMan builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_PDF

The default XSLT file for the DocbookPdf builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_SLIDESHTML

The default XSLT file for the DocbookSlidesHtml builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_DEFAULT_XSL_SLIDESPDF

The default XSLT file for the DocbookSlidesPdf builder within the current environment, if no other XSLT gets specified via keyword.

DOCBOOK_FOP

The path to the PDF renderer fop or xep, if one of them is installed (fop gets checked first).

DOCBOOK_FOPCOM

The full command-line for the PDF renderer fop or xep.

DOCBOOK_FOPCOMSTR

The string displayed when a renderer like fop or xep is used to create PDF output from an XML file.

DOCBOOK_FOPFLAGS

Additonal command-line flags for the PDF renderer fop or xep.

DOCBOOK_XMLLINT

The path to the external executable xmllint, if it's installed. Note, that this is only used as last fallback for resolving XIncludes, if no lxml Python binding can be imported in the current system.

DOCBOOK_XMLLINTCOM

The full command-line for the external executable xmllint.

DOCBOOK_XMLLINTCOMSTR

The string displayed when xmllint is used to resolve XIncludes for a given XML file.

DOCBOOK_XMLLINTFLAGS

Additonal command-line flags for the external executable xmllint.

DOCBOOK_XSLTPROC

The path to the external executable xsltproc (or saxon, xalan), if one of them is installed. Note, that this is only used as last fallback for XSL transformations, if no lxml Python binding can be imported in the current system.

DOCBOOK_XSLTPROCCOM

The full command-line for the external executable xsltproc (or saxon, xalan).

DOCBOOK_XSLTPROCCOMSTR

The string displayed when xsltproc is used to transform an XML file via a given XSLT stylesheet.

DOCBOOK_XSLTPROCFLAGS

Additonal command-line flags for the external executable xsltproc (or saxon, xalan).

DOCBOOK_XSLTPROCPARAMS

Additonal parameters that are not intended for the XSLT processor executable, but the XSL processing itself. By default, they get appended at the end of the command line for saxon and saxon-xslt, respectively.

DPATH

List of paths to search for import modules.

DRPATHPREFIX

DRPATHPREFIX.

DRPATHSUFFIX

DRPATHSUFFIX.

DSUFFIXES

The list of suffixes of files that will be scanned for imported D package files. The default list is ['.d'].

DVERPREFIX

DVERPREFIX.

DVERSIONS

List of version tags to enable when compiling.

DVERSUFFIX

DVERSUFFIX.

DVIPDF

The TeX DVI file to PDF file converter.

DVIPDFCOM

The command line used to convert TeX DVI files into a PDF file.

DVIPDFCOMSTR

The string displayed when a TeX DVI file is converted into a PDF file. If this is not set, then $DVIPDFCOM (the command line) is displayed.

DVIPDFFLAGS

General options passed to the TeX DVI file to PDF file converter.

DVIPS

The TeX DVI file to PostScript converter.

DVIPSFLAGS

General options passed to the TeX DVI file to PostScript converter.

ENV

The execution environment - a dictionary of environment variables used when SCons invokes external commands to build targets defined in this construction environment. When $ENV is passed to a command, all list values are assumed to be path lists and are joined using the search path separator. Any other non-string values are coerced to a string.

Note that by default SCons does not propagate the environment in effect when you execute scons (the "shell environment") to the execution environment. This is so that builds will be guaranteed repeatable regardless of the environment variables set at the time scons is invoked. If you want to propagate a shell environment variable to the commands executed to build target files, you must do so explicitly. A common example is the system PATH environment variable, so that scons will find utilities the same way as the invoking shell (or other process):

import os
env = Environment(ENV={'PATH': os.environ['PATH']})

Although it is usually not recommended, you can propagate the entire shell environment in one go:

import os
env = Environment(ENV=os.environ.copy())

ESCAPE

A function that will be called to escape shell special characters in command lines. The function should take one argument: the command line string to escape; and should return the escaped command line.

F03

The Fortran 03 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F03 if you need to use a specific compiler or compiler version for Fortran 03 files.

F03COM

The command line used to compile a Fortran 03 source file to an object file. You only need to set $F03COM if you need to use a specific command line for Fortran 03 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F03COMSTR

If set, the string displayed when a Fortran 03 source file is compiled to an object file. If not set, then $F03COM or $FORTRANCOM (the command line) is displayed.

F03FILESUFFIXES

The list of file extensions for which the F03 dialect will be used. By default, this is ['.f03']

F03FLAGS

General user-specified options that are passed to the Fortran 03 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F03PATH. See $_F03INCFLAGS below, for the variable that expands to those options. You only need to set $F03FLAGS if you need to define specific user options for Fortran 03 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F03INCFLAGS

An automatically-generated construction variable containing the Fortran 03 compiler command-line options for specifying directories to be searched for include files. The value of $_F03INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F03PATH.

F03PATH

The list of directories that the Fortran 03 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F03FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F03PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F03PATH if you need to define a specific include path for Fortran 03 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F03PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F03PATH=include)

The directory list will be added to command lines through the automatically-generated $_F03INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F03PATH. Any command lines you define that need the F03PATH directory list should include $_F03INCFLAGS:

env = Environment(F03COM="my_compiler $_F03INCFLAGS -c -o $TARGET $SOURCE")

F03PPCOM

The command line used to compile a Fortran 03 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F03FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F03PPCOM if you need to use a specific C-preprocessor command line for Fortran 03 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F03PPCOMSTR

If set, the string displayed when a Fortran 03 source file is compiled to an object file after first running the file through the C preprocessor. If not set, then $F03PPCOM or $FORTRANPPCOM (the command line) is displayed.

F03PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F03 dialect will be used. By default, this is empty.

F08

The Fortran 08 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F08 if you need to use a specific compiler or compiler version for Fortran 08 files.

F08COM

The command line used to compile a Fortran 08 source file to an object file. You only need to set $F08COM if you need to use a specific command line for Fortran 08 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F08COMSTR

If set, the string displayed when a Fortran 08 source file is compiled to an object file. If not set, then $F08COM or $FORTRANCOM (the command line) is displayed.

F08FILESUFFIXES

The list of file extensions for which the F08 dialect will be used. By default, this is ['.f08']

F08FLAGS

General user-specified options that are passed to the Fortran 08 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F08PATH. See $_F08INCFLAGS below, for the variable that expands to those options. You only need to set $F08FLAGS if you need to define specific user options for Fortran 08 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F08INCFLAGS

An automatically-generated construction variable containing the Fortran 08 compiler command-line options for specifying directories to be searched for include files. The value of $_F08INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F08PATH.

F08PATH

The list of directories that the Fortran 08 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F08FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F08PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F08PATH if you need to define a specific include path for Fortran 08 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F08PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F08PATH=include)

The directory list will be added to command lines through the automatically-generated $_F08INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F08PATH. Any command lines you define that need the F08PATH directory list should include $_F08INCFLAGS:

env = Environment(F08COM="my_compiler $_F08INCFLAGS -c -o $TARGET $SOURCE")

F08PPCOM

The command line used to compile a Fortran 08 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F08FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F08PPCOM if you need to use a specific C-preprocessor command line for Fortran 08 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F08PPCOMSTR

If set, the string displayed when a Fortran 08 source file is compiled to an object file after first running the file through the C preprocessor. If not set, then $F08PPCOM or $FORTRANPPCOM (the command line) is displayed.

F08PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F08 dialect will be used. By default, this is empty.

F77

The Fortran 77 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F77 if you need to use a specific compiler or compiler version for Fortran 77 files.

F77COM

The command line used to compile a Fortran 77 source file to an object file. You only need to set $F77COM if you need to use a specific command line for Fortran 77 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F77COMSTR

If set, the string displayed when a Fortran 77 source file is compiled to an object file. If not set, then $F77COM or $FORTRANCOM (the command line) is displayed.

F77FILESUFFIXES

The list of file extensions for which the F77 dialect will be used. By default, this is ['.f77']

F77FLAGS

General user-specified options that are passed to the Fortran 77 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F77PATH. See $_F77INCFLAGS below, for the variable that expands to those options. You only need to set $F77FLAGS if you need to define specific user options for Fortran 77 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F77INCFLAGS

An automatically-generated construction variable containing the Fortran 77 compiler command-line options for specifying directories to be searched for include files. The value of $_F77INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F77PATH.

F77PATH

The list of directories that the Fortran 77 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F77FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F77PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F77PATH if you need to define a specific include path for Fortran 77 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F77PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F77PATH=include)

The directory list will be added to command lines through the automatically-generated $_F77INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F77PATH. Any command lines you define that need the F77PATH directory list should include $_F77INCFLAGS:

env = Environment(F77COM="my_compiler $_F77INCFLAGS -c -o $TARGET $SOURCE")

F77PPCOM

The command line used to compile a Fortran 77 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F77FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F77PPCOM if you need to use a specific C-preprocessor command line for Fortran 77 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F77PPCOMSTR

If set, the string displayed when a Fortran 77 source file is compiled to an object file after first running the file through the C preprocessor. If not set, then $F77PPCOM or $FORTRANPPCOM (the command line) is displayed.

F77PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F77 dialect will be used. By default, this is empty.

F90

The Fortran 90 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F90 if you need to use a specific compiler or compiler version for Fortran 90 files.

F90COM

The command line used to compile a Fortran 90 source file to an object file. You only need to set $F90COM if you need to use a specific command line for Fortran 90 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F90COMSTR

If set, the string displayed when a Fortran 90 source file is compiled to an object file. If not set, then $F90COM or $FORTRANCOM (the command line) is displayed.

F90FILESUFFIXES

The list of file extensions for which the F90 dialect will be used. By default, this is ['.f90']

F90FLAGS

General user-specified options that are passed to the Fortran 90 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F90PATH. See $_F90INCFLAGS below, for the variable that expands to those options. You only need to set $F90FLAGS if you need to define specific user options for Fortran 90 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F90INCFLAGS

An automatically-generated construction variable containing the Fortran 90 compiler command-line options for specifying directories to be searched for include files. The value of $_F90INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F90PATH.

F90PATH

The list of directories that the Fortran 90 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F90FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F90PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F90PATH if you need to define a specific include path for Fortran 90 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F90PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F90PATH=include)

The directory list will be added to command lines through the automatically-generated $_F90INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F90PATH. Any command lines you define that need the F90PATH directory list should include $_F90INCFLAGS:

env = Environment(F90COM="my_compiler $_F90INCFLAGS -c -o $TARGET $SOURCE")

F90PPCOM

The command line used to compile a Fortran 90 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F90FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F90PPCOM if you need to use a specific C-preprocessor command line for Fortran 90 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F90PPCOMSTR

If set, the string displayed when a Fortran 90 source file is compiled after first running the file through the C preprocessor. If not set, then $F90PPCOM or $FORTRANPPCOM (the command line) is displayed.

F90PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F90 dialect will be used. By default, this is empty.

F95

The Fortran 95 compiler. You should normally set the $FORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $F95 if you need to use a specific compiler or compiler version for Fortran 95 files.

F95COM

The command line used to compile a Fortran 95 source file to an object file. You only need to set $F95COM if you need to use a specific command line for Fortran 95 files. You should normally set the $FORTRANCOM variable, which specifies the default command line for all Fortran versions.

F95COMSTR

If set, the string displayed when a Fortran 95 source file is compiled to an object file. If not set, then $F95COM or $FORTRANCOM (the command line) is displayed.

F95FILESUFFIXES

The list of file extensions for which the F95 dialect will be used. By default, this is ['.f95']

F95FLAGS

General user-specified options that are passed to the Fortran 95 compiler. Note that this variable does not contain -I (or similar) include search path options that scons generates automatically from $F95PATH. See $_F95INCFLAGS below, for the variable that expands to those options. You only need to set $F95FLAGS if you need to define specific user options for Fortran 95 files. You should normally set the $FORTRANFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

_F95INCFLAGS

An automatically-generated construction variable containing the Fortran 95 compiler command-line options for specifying directories to be searched for include files. The value of $_F95INCFLAGS is created by appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $F95PATH.

F95PATH

The list of directories that the Fortran 95 compiler will search for include directories. The implicit dependency scanner will search these directories for include files. Don't explicitly put include directory arguments in $F95FLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $F95PATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #: You only need to set $F95PATH if you need to define a specific include path for Fortran 95 files. You should normally set the $FORTRANPATH variable, which specifies the include path for the default Fortran compiler for all Fortran versions.

env = Environment(F95PATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(F95PATH=include)

The directory list will be added to command lines through the automatically-generated $_F95INCFLAGS construction variable, which is constructed by appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $F95PATH. Any command lines you define that need the F95PATH directory list should include $_F95INCFLAGS:

env = Environment(F95COM="my_compiler $_F95INCFLAGS -c -o $TARGET $SOURCE")

F95PPCOM

The command line used to compile a Fortran 95 source file to an object file after first running the file through the C preprocessor. Any options specified in the $F95FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $F95PPCOM if you need to use a specific C-preprocessor command line for Fortran 95 files. You should normally set the $FORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

F95PPCOMSTR

If set, the string displayed when a Fortran 95 source file is compiled to an object file after first running the file through the C preprocessor. If not set, then $F95PPCOM or $FORTRANPPCOM (the command line) is displayed.

F95PPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for F95 dialect will be used. By default, this is empty.

File

A function that converts a string into a File instance relative to the target being built.

FORTRAN

The default Fortran compiler for all versions of Fortran.

FORTRANCOM

The command line used to compile a Fortran source file to an object file. By default, any options specified in the $FORTRANFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line.

FORTRANCOMMONFLAGS

General user-specified options that are passed to the Fortran compiler. Similar to $FORTRANFLAGS, but this variable is applied to all dialects.

FORTRANCOMSTR

If set, the string displayed when a Fortran source file is compiled to an object file. If not set, then $FORTRANCOM (the command line) is displayed.

FORTRANFILESUFFIXES

The list of file extensions for which the FORTRAN dialect will be used. By default, this is ['.f', '.for', '.ftn']

FORTRANFLAGS

General user-specified options for the FORTRAN dialect that are passed to the Fortran compiler. Note that this variable does not contain -I (or similar) include or module search path options that scons generates automatically from $FORTRANPATH. See $_FORTRANINCFLAGS and $_FORTRANMODFLAG, below, for the variables that expand those options.

_FORTRANINCFLAGS

An automatically-generated construction variable containing the Fortran compiler command-line options for specifying directories to be searched for include files and module files. The value of $_FORTRANINCFLAGS is created by respectively prepending and appending $INCPREFIX and $INCSUFFIX to the beginning and end of each directory in $FORTRANPATH.

FORTRANMODDIR

Directory location where the Fortran compiler should place any module files it generates. This variable is empty, by default. Some Fortran compilers will internally append this directory in the search path for module files, as well.

FORTRANMODDIRPREFIX

The prefix used to specify a module directory on the Fortran compiler command line. This will be prepended to the beginning of the directory in the $FORTRANMODDIR construction variables when the $_FORTRANMODFLAG variables is automatically generated.

FORTRANMODDIRSUFFIX

The suffix used to specify a module directory on the Fortran compiler command line. This will be appended to the end of the directory in the $FORTRANMODDIR construction variables when the $_FORTRANMODFLAG variables is automatically generated.

_FORTRANMODFLAG

An automatically-generated construction variable containing the Fortran compiler command-line option for specifying the directory location where the Fortran compiler should place any module files that happen to get generated during compilation. The value of $_FORTRANMODFLAG is created by respectively prepending and appending $FORTRANMODDIRPREFIX and $FORTRANMODDIRSUFFIX to the beginning and end of the directory in $FORTRANMODDIR.

FORTRANMODPREFIX

The module file prefix used by the Fortran compiler. SCons assumes that the Fortran compiler follows the quasi-standard naming convention for module files of module_name.mod. As a result, this variable is left empty, by default. For situations in which the compiler does not necessarily follow the normal convention, the user may use this variable. Its value will be appended to every module file name as scons attempts to resolve dependencies.

FORTRANMODSUFFIX

The module file suffix used by the Fortran compiler. SCons assumes that the Fortran compiler follows the quasi-standard naming convention for module files of module_name.mod. As a result, this variable is set to ".mod", by default. For situations in which the compiler does not necessarily follow the normal convention, the user may use this variable. Its value will be appended to every module file name as scons attempts to resolve dependencies.

FORTRANPATH

The list of directories that the Fortran compiler will search for include files and (for some compilers) module files. The Fortran implicit dependency scanner will search these directories for include files (but not module files since they are autogenerated and, as such, may not actually exist at the time the scan takes place). Don't explicitly put include directory arguments in FORTRANFLAGS because the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in FORTRANPATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use #:

env = Environment(FORTRANPATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(FORTRANPATH=include)

The directory list will be added to command lines through the automatically-generated $_FORTRANINCFLAGS construction variable, which is constructed by respectively prepending and appending the values of the $INCPREFIX and $INCSUFFIX construction variables to the beginning and end of each directory in $FORTRANPATH. Any command lines you define that need the FORTRANPATH directory list should include $_FORTRANINCFLAGS:

env = Environment(FORTRANCOM="my_compiler $_FORTRANINCFLAGS -c -o $TARGET $SOURCE")

FORTRANPPCOM

The command line used to compile a Fortran source file to an object file after first running the file through the C preprocessor. By default, any options specified in the $FORTRANFLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line.

FORTRANPPCOMSTR

If set, the string displayed when a Fortran source file is compiled to an object file after first running the file through the C preprocessor. If not set, then $FORTRANPPCOM (the command line) is displayed.

FORTRANPPFILESUFFIXES

The list of file extensions for which the compilation + preprocessor pass for FORTRAN dialect will be used. By default, this is ['.fpp', '.FPP']

FORTRANSUFFIXES

The list of suffixes of files that will be scanned for Fortran implicit dependencies (INCLUDE lines and USE statements). The default list is:

[".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
".f77", ".F77", ".f90", ".F90", ".f95", ".F95"]

FRAMEWORKPATH

On Mac OS X with gcc, a list containing the paths to search for frameworks. Used by the compiler to find framework-style includes like #include <Fmwk/Header.h>. Used by the linker to find user-specified frameworks when linking (see $FRAMEWORKS). For example:

env.AppendUnique(FRAMEWORKPATH='#myframeworkdir')

will add

... -Fmyframeworkdir

to the compiler and linker command lines.

_FRAMEWORKPATH

On Mac OS X with gcc, an automatically-generated construction variable containing the linker command-line options corresponding to $FRAMEWORKPATH.

FRAMEWORKPATHPREFIX

On Mac OS X with gcc, the prefix to be used for the FRAMEWORKPATH entries. (see $FRAMEWORKPATH). The default value is -F.

FRAMEWORKPREFIX

On Mac OS X with gcc, the prefix to be used for linking in frameworks (see $FRAMEWORKS). The default value is -framework.

FRAMEWORKS

On Mac OS X with gcc, a list of the framework names to be linked into a program or shared library or bundle. The default value is the empty list. For example:

env.AppendUnique(FRAMEWORKS=Split('System Cocoa SystemConfiguration'))

_FRAMEWORKS

On Mac OS X with gcc, an automatically-generated construction variable containing the linker command-line options for linking with FRAMEWORKS.

FRAMEWORKSFLAGS

On Mac OS X with gcc, general user-supplied frameworks options to be added at the end of a command line building a loadable module. (This has been largely superseded by the $FRAMEWORKPATH, $FRAMEWORKPATHPREFIX, $FRAMEWORKPREFIX and $FRAMEWORKS variables described above.)

GS

The Ghostscript program used to, for example, convert PostScript to PDF files.

GSCOM

The full Ghostscript command line used for the conversion process. Its default value is “$GS $GSFLAGS -sOutputFile=$TARGET $SOURCES”.

GSCOMSTR

The string displayed when Ghostscript is called for the conversion process. If this is not set (the default), then $GSCOM (the command line) is displayed.

GSFLAGS

General options passed to the Ghostscript program, when converting PostScript to PDF files for example. Its default value is “-dNOPAUSE -dBATCH -sDEVICE=pdfwrite”

HOST_ARCH

The name of the host hardware architecture used to create this construction environment. The platform code sets this when initializing (see $PLATFORM and the platform argument to Environment). Note the detected name of the architecture may not be identical to that returned by the Python platform.machine method.

On the win32 platform, if the Microsoft Visual C++ compiler is available, msvc tool setup is done using $HOST_ARCH and $TARGET_ARCH. Changing the values at any later time will not cause the tool to be reinitialized. Valid host arch values are x86 and arm for 32-bit hosts and amd64 and x86_64 for 64-bit hosts.

Should be considered immutable. $HOST_ARCH is not currently used by other platforms, but the option is reserved to do so in future

HOST_OS

The name of the host operating system for the platform used to create this construction environment. The platform code sets this when initializing (see $PLATFORM and the platform argument to Environment).

Should be considered immutable. $HOST_OS is not currently used by SCons, but the option is reserved to do so in future

IDLSUFFIXES

The list of suffixes of files that will be scanned for IDL implicit dependencies (#include or import lines). The default list is:

[".idl", ".IDL"]

IMPLIBNOVERSIONSYMLINKS

Used to override $SHLIBNOVERSIONSYMLINKS/$LDMODULENOVERSIONSYMLINKS when creating versioned import library for a shared library/loadable module. If not defined, then $SHLIBNOVERSIONSYMLINKS/$LDMODULENOVERSIONSYMLINKS is used to determine whether to disable symlink generation or not.

IMPLIBPREFIX

The prefix used for import library names. For example, cygwin uses import libraries (libfoo.dll.a) in pair with dynamic libraries (cygfoo.dll). The cyglink linker sets $IMPLIBPREFIX to 'lib' and $SHLIBPREFIX to 'cyg'.

IMPLIBSUFFIX

The suffix used for import library names. For example, cygwin uses import libraries (libfoo.dll.a) in pair with dynamic libraries (cygfoo.dll). The cyglink linker sets $IMPLIBSUFFIX to '.dll.a' and $SHLIBSUFFIX to '.dll'.

IMPLIBVERSION

Used to override $SHLIBVERSION/$LDMODULEVERSION when generating versioned import library for a shared library/loadable module. If undefined, the $SHLIBVERSION/$LDMODULEVERSION is used to determine the version of versioned import library.

IMPLICIT_COMMAND_DEPENDENCIES

Controls whether or not SCons will add implicit dependencies for the commands executed to build targets.

By default, SCons will add to each target an implicit dependency on the command represented by the first argument of any command line it executes (which is typically the command itself). By setting such a dependency, SCons can determine that a target should be rebuilt if the command changes, such as when a compiler is upgraded to a new version. The specific file for the dependency is found by searching the PATH variable in the ENV dictionary in the construction environment used to execute the command. The default is the same as setting the construction variable $IMPLICIT_COMMAND_DEPENDENCIES to a True-like value (“true”, “yes”, or “1” - but not a number greater than one, as that has a different meaning).

Action strings can be segmented by the use of an AND operator, &&. In a segemented string, each segment is a separate “command line”, these are run sequentially until one fails or the entire sequence has been executed. If an action string is segmented, then the selected behavior of $IMPLICIT_COMMAND_DEPENDENCIES is applied to each segment.

If $IMPLICIT_COMMAND_DEPENDENCIES is set to a False-like value (“none”, “false”, “no”, “0”, etc.), then the implicit dependency will not be added to the targets built with that construction environment.

If $IMPLICIT_COMMAND_DEPENDENCIES is set to “2” or higher, then that number of arguments in the command line will be scanned for relative or absolute paths. If any are present, they will be added as implicit dependencies to the targets built with that construction environment. The first argument in the command line will be searched for using the PATH variable in the ENV dictionary in the construction environment used to execute the command. The other arguments will only be found if they are absolute paths or valid paths relative to the working directory.

If $IMPLICIT_COMMAND_DEPENDENCIES is set to “all”, then all arguments in the command line will be scanned for relative or absolute paths. If any are present, they will be added as implicit dependencies to the targets built with that construction environment. The first argument in the command line will be searched for using the PATH variable in the ENV dictionary in the construction environment used to execute the command. The other arguments will only be found if they are absolute paths or valid paths relative to the working directory.

env = Environment(IMPLICIT_COMMAND_DEPENDENCIES=False)

INCPREFIX

The prefix used to specify an include directory on the C compiler command line. This will be prepended to each directory in the $CPPPATH and $FORTRANPATH construction variables when the $_CPPINCFLAGS and $_FORTRANINCFLAGS variables are automatically generated.

INCSUFFIX

The suffix used to specify an include directory on the C compiler command line. This will be appended to each directory in the $CPPPATH and $FORTRANPATH construction variables when the $_CPPINCFLAGS and $_FORTRANINCFLAGS variables are automatically generated.

INSTALL

A function to be called to install a file into a destination file name. The default function copies the file into the destination (and sets the destination file's mode and permission bits to match the source file's). The function takes the following arguments:

def install(dest, source, env):

dest is the path name of the destination file. source is the path name of the source file. env is the construction environment (a dictionary of construction values) in force for this file installation.

INSTALLSTR

The string displayed when a file is installed into a destination file name. The default is:

Install file: "$SOURCE" as "$TARGET"

INTEL_C_COMPILER_VERSION

Set by the intelc Tool to the major version number of the Intel C compiler selected for use.

JAR

The Java archive tool.

JARCHDIR

The directory to which the Java archive tool should change (using the -C option).

JARCOM

The command line used to call the Java archive tool.

JARCOMSTR

The string displayed when the Java archive tool is called If this is not set, then $JARCOM (the command line) is displayed.

env = Environment(JARCOMSTR="JARchiving $SOURCES into $TARGET")

JARFLAGS

General options passed to the Java archive tool. By default this is set to cf to create the necessary jar file.

JARSUFFIX

The suffix for Java archives: .jar by default.

JAVABOOTCLASSPATH

Specifies the list of directories that will be added to the javac command line via the -bootclasspath option. The individual directory names will be separated by the operating system's path separate character (: on UNIX/Linux/POSIX, ; on Windows).

JAVAC

The Java compiler.

JAVACCOM

The command line used to compile a directory tree containing Java source files to corresponding Java class files. Any options specified in the $JAVACFLAGS construction variable are included on this command line.

JAVACCOMSTR

The string displayed when compiling a directory tree of Java source files to corresponding Java class files. If this is not set, then $JAVACCOM (the command line) is displayed.

env = Environment(JAVACCOMSTR="Compiling class files $TARGETS from $SOURCES")

JAVACFLAGS

General options that are passed to the Java compiler.

JAVACLASSDIR

The directory in which Java class files may be found. This is stripped from the beginning of any Java .class file names supplied to the JavaH builder.

JAVACLASSPATH

Specifies the list of directories that will be searched for Java .class file. The directories in this list will be added to the javac and javah command lines via the -classpath option. The individual directory names will be separated by the operating system's path separate character (: on UNIX/Linux/POSIX, ; on Windows).

JAVACLASSSUFFIX

The suffix for Java class files; .class by default.

JAVAH

The Java generator for C header and stub files.

JAVAHCOM

The command line used to generate C header and stub files from Java classes. Any options specified in the $JAVAHFLAGS construction variable are included on this command line.

JAVAHCOMSTR

The string displayed when C header and stub files are generated from Java classes. If this is not set, then $JAVAHCOM (the command line) is displayed.

env = Environment(JAVAHCOMSTR="Generating header/stub file(s) $TARGETS from $SOURCES")

JAVAHFLAGS

General options passed to the C header and stub file generator for Java classes.

JAVAINCLUDES

Include path for Java header files (such as jni.h)

JAVASOURCEPATH

Specifies the list of directories that will be searched for input .java file. The directories in this list will be added to the javac command line via the -sourcepath option. The individual directory names will be separated by the operating system's path separate character (: on UNIX/Linux/POSIX, ; on Windows).

Note that this currently just adds the specified directory via the -sourcepath option. SCons does not currently search the $JAVASOURCEPATH directories for dependency .java files.

JAVASUFFIX

The suffix for Java files; .java by default.

JAVAVERSION

Specifies the Java version being used by the Java builder. Set this to specify the version of Java targeted by the javac compiler. This is sometimes necessary because Java 1.5 changed the file names that are created for nested anonymous inner classes, which can cause a mismatch with the files that SCons expects will be generated by the javac compiler. Setting $JAVAVERSION to a version greater than 1.4 makes SCons realize that a build with such a compiler is actually up to date. The default is 1.4.

While this is not primarily intended for selecting one version of the Java compiler vs. another, it does have that effect on the Windows platform. A more precise approach is to set $JAVAC (and related construction variables for related utilities) to the path to the specific Java compiler you want, if that is not the default compiler. On non-Windows platforms, the alternatives system may provide a way to adjust the default Java compiler without having to specify explicit paths.

LATEX

The LaTeX structured formatter and typesetter.

LATEXCOM

The command line used to call the LaTeX structured formatter and typesetter.

LATEXCOMSTR

The string displayed when calling the LaTeX structured formatter and typesetter. If this is not set, then $LATEXCOM (the command line) is displayed.

env = Environment(LATEXCOMSTR = "Building $TARGET from LaTeX input $SOURCES")

LATEXFLAGS

General options passed to the LaTeX structured formatter and typesetter.

LATEXRETRIES

The maximum number of times that LaTeX will be re-run if the .log generated by the $LATEXCOM command indicates that there are undefined references. The default is to try to resolve undefined references by re-running LaTeX up to three times.

LATEXSUFFIXES

The list of suffixes of files that will be scanned for LaTeX implicit dependencies (\include or \import files). The default list is:

[".tex", ".ltx", ".latex"]

LDMODULE

The linker for building loadable modules. By default, this is the same as $SHLINK.

LDMODULECOM

The command line for building loadable modules. On Mac OS X, this uses the $LDMODULE, $LDMODULEFLAGS and $FRAMEWORKSFLAGS variables. On other systems, this is the same as $SHLINK.

LDMODULECOMSTR

If set, the string displayed when building loadable modules. If not set, then $LDMODULECOM (the command line) is displayed.

LDMODULEEMITTER

Contains the emitter specification for the LoadableModule builder. The manpage section "Builder Objects" contains general information on specifying emitters.

LDMODULEFLAGS

General user options passed to the linker for building loadable modules.

LDMODULENOVERSIONSYMLINKS

Instructs the LoadableModule builder to not automatically create symlinks for versioned modules. Defaults to $SHLIBNOVERSIONSYMLINKS

LDMODULEPREFIX

The prefix used for loadable module file names. On Mac OS X, this is null; on other systems, this is the same as $SHLIBPREFIX.

_LDMODULESONAME

A macro that automatically generates loadable module's SONAME based on $TARGET, $LDMODULEVERSION and $LDMODULESUFFIX. Used by LoadableModule builder when the linker tool supports SONAME (e.g. gnulink).

LDMODULESUFFIX

The suffix used for loadable module file names. On Mac OS X, this is null; on other systems, this is the same as $SHLIBSUFFIX.

LDMODULEVERSION

When this construction variable is defined, a versioned loadable module is created by LoadableModule builder. This activates the $_LDMODULEVERSIONFLAGS and thus modifies the $LDMODULECOM as required, adds the version number to the library name, and creates the symlinks that are needed. $LDMODULEVERSION versions should exist in the same format as $SHLIBVERSION.

_LDMODULEVERSIONFLAGS

This macro automatically introduces extra flags to $LDMODULECOM when building versioned LoadableModule (that is when $LDMODULEVERSION is set). _LDMODULEVERSIONFLAGS usually adds $SHLIBVERSIONFLAGS and some extra dynamically generated options (such as -Wl,-soname=$_LDMODULESONAME). It is unused by plain (unversioned) loadable modules.

LDMODULEVERSIONFLAGS

Extra flags added to $LDMODULECOM when building versioned LoadableModule. These flags are only used when $LDMODULEVERSION is set.

LEX

The lexical analyzer generator.

LEX_HEADER_FILE

If supplied, generate a C header file with the name taken from this variable. Will be emitted as a --header-file= command-line option. Use this in preference to including --header-file= in $LEXFLAGS directly.

LEX_TABLES_FILE

If supplied, write the lex tables to a file with the name taken from this variable. Will be emitted as a --tables-file= command-line option. Use this in preference to including --tables-file= in $LEXFLAGS directly.

LEXCOM

The command line used to call the lexical analyzer generator to generate a source file.

LEXCOMSTR

The string displayed when generating a source file using the lexical analyzer generator. If this is not set, then $LEXCOM (the command line) is displayed.

env = Environment(LEXCOMSTR="Lex'ing $TARGET from $SOURCES")

LEXFLAGS

General options passed to the lexical analyzer generator. In addition to passing the value on during invocation, the lex tool also examines this construction variable for options which cause additional output files to be generated, and adds those to the target list. Recognized for this purpose are GNU flex options --header-file= and --tables-file=; the output file is named by the option argument.

Note that files specified by --header-file= and --tables-file= may not be properly handled by SCons in all situations. Consider using $LEX_HEADER_FILE and $LEX_TABLES_FILE instead.

LEXUNISTD

Used only on windows environments to set a lex flag to prevent 'unistd.h' from being included. The default value is '--nounistd'.

_LIBDIRFLAGS

An automatically-generated construction variable containing the linker command-line options for specifying directories to be searched for library. The value of $_LIBDIRFLAGS is created by respectively prepending and appending $LIBDIRPREFIX and $LIBDIRSUFFIX to each directory in $LIBPATH.

LIBDIRPREFIX

The prefix used to specify a library directory on the linker command line. This will be prepended to each directory in the $LIBPATH construction variable when the $_LIBDIRFLAGS variable is automatically generated.

LIBDIRSUFFIX

The suffix used to specify a library directory on the linker command line. This will be appended to each directory in the $LIBPATH construction variable when the $_LIBDIRFLAGS variable is automatically generated.

LIBEMITTER

Contains the emitter specification for the StaticLibrary builder. The manpage section "Builder Objects" contains general information on specifying emitters.

_LIBFLAGS

An automatically-generated construction variable containing the linker command-line options for specifying libraries to be linked with the resulting target. The value of $_LIBFLAGS is created by respectively prepending and appending $LIBLINKPREFIX and $LIBLINKSUFFIX to each filename in $LIBS.

LIBLINKPREFIX

The prefix used to specify a library to link on the linker command line. This will be prepended to each library in the $LIBS construction variable when the $_LIBFLAGS variable is automatically generated.

LIBLINKSUFFIX

The suffix used to specify a library to link on the linker command line. This will be appended to each library in the $LIBS construction variable when the $_LIBFLAGS variable is automatically generated.

LIBPATH

The list of directories that will be searched for libraries specified by the $LIBS construction variable. $LIBPATH should be a list of path strings, or a single string, not a pathname list joined by Python's os.sep. Do not put library search directives directly into $LINKFLAGS or $SHLINKFLAGS as the result will be non-portable.

Note: directory names in $LIBPATH will be looked-up relative to the directory of the SConscript file when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use the # prefix:

env = Environment(LIBPATH='#/libs')

The directory look-up can also be forced using the Dir function:

libs = Dir('libs')
env = Environment(LIBPATH=libs)

The directory list will be added to command lines through the automatically-generated $_LIBDIRFLAGS construction variable, which is constructed by respectively prepending and appending the values of the $LIBDIRPREFIX and $LIBDIRSUFFIX construction variables to each directory in $LIBPATH. Any command lines you define that need the $LIBPATH directory list should include $_LIBDIRFLAGS:

env = Environment(LINKCOM="my_linker $_LIBDIRFLAGS $_LIBFLAGS -o $TARGET $SOURCE")

LIBPREFIX

The prefix used for (static) library file names. A default value is set for each platform (posix, win32, os2, etc.), but the value is overridden by individual tools (ar, mslib, sgiar, sunar, tlib, etc.) to reflect the names of the libraries they create.

LIBPREFIXES

A list of all legal prefixes for library file names. When searching for library dependencies, SCons will look for files with these prefixes, the base library name, and suffixes from the $LIBSUFFIXES list.

LIBS

A list of one or more libraries that will be added to the link line for linking with any executable program, shared library, or loadable module created by the construction environment or override.

String-valued library names should include only the library base names, without prefixes such as lib or suffixes such as .so or .dll. The library list will be added to command lines through the automatically-generated $_LIBFLAGS construction variable which is constructed by respectively prepending and appending the values of the $LIBLINKPREFIX and $LIBLINKSUFFIX construction variables to each library name in $LIBS. Library name strings should not include a path component, instead the compiler will be directed to look for libraries in the paths specified by $LIBPATH.

Any command lines you define that need the $LIBS library list should include $_LIBFLAGS:

env = Environment(LINKCOM="my_linker $_LIBDIRFLAGS $_LIBFLAGS -o $TARGET $SOURCE")

If you add a File object to the $LIBS list, the name of that file will be added to $_LIBFLAGS, and thus to the link line, as-is, without $LIBLINKPREFIX or $LIBLINKSUFFIX. For example:

env.Append(LIBS=File('/tmp/mylib.so'))

In all cases, scons will add dependencies from the executable program to all the libraries in this list.

LIBSUFFIX

The suffix used for (static) library file names. A default value is set for each platform (posix, win32, os2, etc.), but the value is overridden by individual tools (ar, mslib, sgiar, sunar, tlib, etc.) to reflect the names of the libraries they create.

LIBSUFFIXES

A list of all legal suffixes for library file names. When searching for library dependencies, SCons will look for files with prefixes from the $LIBPREFIXES list, the base library name, and these suffixes.

LICENSE

The abbreviated name, preferably the SPDX code, of the license under which this project is released (GPL-3.0, LGPL-2.1, BSD-2-Clause etc.). See http://www.opensource.org/licenses/alphabetical for a list of license names and SPDX codes.

See the Package builder.

LINESEPARATOR

The separator used by the Substfile and Textfile builders. This value is used between sources when constructing the target. It defaults to the current system line separator.

LINGUAS_FILE

The $LINGUAS_FILE defines file(s) containing list of additional linguas to be processed by POInit, POUpdate or MOFiles builders. It also affects Translate builder. If the variable contains a string, it defines name of the list file. The $LINGUAS_FILE may be a list of file names as well. If $LINGUAS_FILE is set to True (or non-zero numeric value), the list will be read from default file named LINGUAS.

LINK

The linker. See also $SHLINK for linking shared objects.

On POSIX systems (those using the link tool), you should normally not change this value as it defaults to a "smart" linker tool which selects a compiler driver matching the type of source files in use. So for example, if you set $CXX to a specific compiler name, and are compiling C++ sources, the smartlink function will automatically select the same compiler for linking.

LINKCOM

The command line used to link object files into an executable. See also $SHLINKCOM for linking shared objects.

LINKCOMSTR

If set, the string displayed when object files are linked into an executable. If not set, then $LINKCOM (the command line) is displayed. See also $SHLINKCOMSTR. for linking shared objects.

env = Environment(LINKCOMSTR = "Linking $TARGET")

LINKFLAGS

General user options passed to the linker. Note that this variable should not contain -l (or similar) options for linking with the libraries listed in $LIBS, nor -L (or similar) library search path options that scons generates automatically from $LIBPATH. See $_LIBFLAGS above, for the variable that expands to library-link options, and $_LIBDIRFLAGS above, for the variable that expands to library search path options. See also $SHLINKFLAGS. for linking shared objects.

M4

The M4 macro preprocessor.

M4COM

The command line used to pass files through the M4 macro preprocessor.

M4COMSTR

The string displayed when a file is passed through the M4 macro preprocessor. If this is not set, then $M4COM (the command line) is displayed.

M4FLAGS

General options passed to the M4 macro preprocessor.

MAKEINDEX

The makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

MAKEINDEXCOM

The command line used to call the makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

MAKEINDEXCOMSTR

The string displayed when calling the makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter. If this is not set, then $MAKEINDEXCOM (the command line) is displayed.

MAKEINDEXFLAGS

General options passed to the makeindex generator for the TeX formatter and typesetter and the LaTeX structured formatter and typesetter.

MAXLINELENGTH

The maximum number of characters allowed on an external command line. On Win32 systems, link lines longer than this many characters are linked via a temporary file name.

MIDL

The Microsoft IDL compiler.

MIDLCOM

The command line used to pass files to the Microsoft IDL compiler.

MIDLCOMSTR

The string displayed when the Microsoft IDL compiler is called. If this is not set, then $MIDLCOM (the command line) is displayed.

MIDLFLAGS

General options passed to the Microsoft IDL compiler.

MOSUFFIX

Suffix used for MO files (default: '.mo'). See msgfmt tool and MOFiles builder.

MSGFMT

Absolute path to msgfmt(1) binary, found by Detect(). See msgfmt tool and MOFiles builder.

MSGFMTCOM

Complete command line to run msgfmt(1) program. See msgfmt tool and MOFiles builder.

MSGFMTCOMSTR

String to display when msgfmt(1) is invoked (default: '', which means ``print $MSGFMTCOM''). See msgfmt tool and MOFiles builder.

MSGFMTFLAGS

Additional flags to msgfmt(1). See msgfmt tool and MOFiles builder.

MSGINIT

Path to msginit(1) program (found via Detect()). See msginit tool and POInit builder.

MSGINITCOM

Complete command line to run msginit(1) program. See msginit tool and POInit builder.

MSGINITCOMSTR

String to display when msginit(1) is invoked (default: '', which means ``print $MSGINITCOM''). See msginit tool and POInit builder.

MSGINITFLAGS

List of additional flags to msginit(1) (default: []). See msginit tool and POInit builder.

_MSGINITLOCALE

Internal ``macro''. Computes locale (language) name based on target filename (default: '${TARGET.filebase}' ).

See msginit tool and POInit builder.

MSGMERGE

Absolute path to msgmerge(1) binary as found by Detect(). See msgmerge tool and POUpdate builder.

MSGMERGECOM

Complete command line to run msgmerge(1) command. See msgmerge tool and POUpdate builder.

MSGMERGECOMSTR

String to be displayed when msgmerge(1) is invoked (default: '', which means ``print $MSGMERGECOM''). See msgmerge tool and POUpdate builder.

MSGMERGEFLAGS

Additional flags to msgmerge(1) command. See msgmerge tool and POUpdate builder.

MSSDK_DIR

The directory containing the Microsoft SDK (either Platform SDK or Windows SDK) to be used for compilation.

MSSDK_VERSION

The version string of the Microsoft SDK (either Platform SDK or Windows SDK) to be used for compilation. Supported versions include 6.1, 6.0A, 6.0, 2003R2 and 2003R1.

MSVC_BATCH

When set to any true value, specifies that SCons should batch compilation of object files when calling the Microsoft Visual C/C++ compiler. All compilations of source files from the same source directory that generate target files in a same output directory and were configured in SCons using the same construction environment will be built in a single call to the compiler. Only source files that have changed since their object files were built will be passed to each compiler invocation (via the $CHANGED_SOURCES construction variable). Any compilations where the object (target) file base name (minus the .obj) does not match the source file base name will be compiled separately.

MSVC_NOTFOUND_POLICY

Specify the scons behavior when the Microsoft Visual C/C++ compiler is not detected.

The $MSVC_NOTFOUND_POLICY specifies the scons behavior when no msvc versions are detected or when the requested msvc version is not detected.

The valid values for $MSVC_NOTFOUND_POLICY and the corresponding scons behavior are:

'Error' or 'Exception': Raise an exception when no msvc versions are detected or when the requested msvc version is not detected.
'Warning' or 'Warn': Issue a warning and continue when no msvc versions are detected or when the requested msvc version is not detected. Depending on usage, this could result in build failure(s).
'Ignore' or 'Suppress': Take no action and continue when no msvc versions are detected or when the requested msvc version is not detected. Depending on usage, this could result in build failure(s).

Note: in addition to the camel case values shown above, lower case and upper case values are accepted as well.

The $MSVC_NOTFOUND_POLICY is applied when any of the following conditions are satisfied:

$MSVC_VERSION is specified, the default tools list is implicitly defined (i.e., the tools list is not specified), and the default tools list contains one or more of the msvc tools.
$MSVC_VERSION is specified, the default tools list is explicitly specified (e.g., tools=['default']), and the default tools list contains one or more of the msvc tools.
A non-default tools list is specified that contains one or more of the msvc tools (e.g., tools=['msvc', 'mslink']).

The $MSVC_NOTFOUND_POLICY is ignored when any of the following conditions are satisfied:

$MSVC_VERSION is not specified and the default tools list is implicitly defined (i.e., the tools list is not specified).
$MSVC_VERSION is not specified and the default tools list is explicitly specified (e.g., tools=['default']).
A non-default tool list is specified that does not contain any of the msvc tools (e.g., tools=['mingw']).

Important usage details:

$MSVC_NOTFOUND_POLICY must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_NOTFOUND_POLICY must be set before the first msvc tool is loaded into the environment.

When $MSVC_NOTFOUND_POLICY is not specified, the default scons behavior is to issue a warning and continue subject to the conditions listed above. The default scons behavior may change in the future.

MSVC_SCRIPT_ARGS

Pass user-defined arguments to the Visual C++ batch file determined via autodetection.

$MSVC_SCRIPT_ARGS is available for msvc batch file arguments that do not have first-class support via construction variables or when there is an issue with the appropriate construction variable validation. When available, it is recommended to use the appropriate construction variables (e.g., $MSVC_TOOLSET_VERSION) rather than $MSVC_SCRIPT_ARGS arguments.

The valid values for $MSVC_SCRIPT_ARGS are: None, a string, or a list of strings.

The $MSVC_SCRIPT_ARGS value is converted to a scalar string (i.e., "flattened"). The resulting scalar string, if not empty, is passed as an argument to the msvc batch file determined via autodetection subject to the validation conditions listed below.

$MSVC_SCRIPT_ARGS is ignored when the value is None and when the result from argument conversion is an empty string. The validation conditions below do not apply.

An exception is raised when any of the following conditions are satisfied:

$MSVC_SCRIPT_ARGS is specified for Visual Studio 2013 and earlier.
Multiple SDK version arguments (e.g., '10.0.20348.0') are specified in $MSVC_SCRIPT_ARGS.
$MSVC_SDK_VERSION is specified and an SDK version argument (e.g., '10.0.20348.0') is specified in $MSVC_SCRIPT_ARGS. Multiple SDK version declarations via $MSVC_SDK_VERSION and $MSVC_SCRIPT_ARGS are not allowed.
Multiple toolset version arguments (e.g., '-vcvars_ver=14.29') are specified in $MSVC_SCRIPT_ARGS.
$MSVC_TOOLSET_VERSION is specified and a toolset version argument (e.g., '-vcvars_ver=14.29') is specified in $MSVC_SCRIPT_ARGS. Multiple toolset version declarations via $MSVC_TOOLSET_VERSION and $MSVC_SCRIPT_ARGS are not allowed.
Multiple spectre library arguments (e.g., '-vcvars_spectre_libs=spectre') are specified in $MSVC_SCRIPT_ARGS.
$MSVC_SPECTRE_LIBS is enabled and a spectre library argument (e.g., '-vcvars_spectre_libs=spectre') is specified in $MSVC_SCRIPT_ARGS. Multiple spectre library declarations via $MSVC_SPECTRE_LIBS and $MSVC_SCRIPT_ARGS are not allowed.
Multiple UWP arguments (e.g., uwp or store) are specified in $MSVC_SCRIPT_ARGS.
$MSVC_UWP_APP is enabled and a UWP argument (e.g., uwp or store) is specified in $MSVC_SCRIPT_ARGS. Multiple UWP declarations via $MSVC_UWP_APP and $MSVC_SCRIPT_ARGS are not allowed.

Example 1 - A Visual Studio 2022 build with an SDK version and a toolset version specified with a string argument:

env = Environment(MSVC_VERSION='14.3', MSVC_SCRIPT_ARGS='10.0.20348.0 -vcvars_ver=14.29.30133')

Example 2 - A Visual Studio 2022 build with an SDK version and a toolset version specified with a list argument:

env = Environment(MSVC_VERSION='14.3', MSVC_SCRIPT_ARGS=['10.0.20348.0', '-vcvars_ver=14.29.30133'])

Important usage details:

$MSVC_SCRIPT_ARGS must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_SCRIPT_ARGS must be set before the first msvc tool is loaded into the environment.
Other than checking for multiple declarations as described above, $MSVC_SCRIPT_ARGS arguments are not validated.
Erroneous, inconsistent, and/or version incompatible $MSVC_SCRIPT_ARGS arguments are likely to result in build failures for reasons that are not readily apparent and may be difficult to diagnose. The burden is on the user to ensure that the arguments provided to the msvc batch file are valid, consistent and compatible with the version of msvc selected.

MSVC_SCRIPTERROR_POLICY

Specify the scons behavior when Microsoft Visual C/C++ batch file errors are detected.

The $MSVC_SCRIPTERROR_POLICY specifies the scons behavior when msvc batch file errors are detected. When $MSVC_SCRIPTERROR_POLICY is not specified, the default scons behavior is to suppress msvc batch file error messages.

The root cause of msvc build failures may be difficult to diagnose. In these situations, setting the scons behavior to issue a warning when msvc batch file errors are detected may produce additional diagnostic information.

The valid values for $MSVC_SCRIPTERROR_POLICY and the corresponding scons behavior are:

'Error' or 'Exception': Raise an exception when msvc batch file errors are detected.
'Warning' or 'Warn': Issue a warning when msvc batch file errors are detected.
'Ignore' or 'Suppress': Suppress msvc batch file error messages.

Note: in addition to the camel case values shown above, lower case and upper case values are accepted as well.

Example 1 - A Visual Studio 2022 build with user-defined script arguments:

env = environment(MSVC_VERSION='14.3', MSVC_SCRIPT_ARGS=['8.1', 'store', '-vcvars_ver=14.1'])
env.Program('hello', ['hello.c'], CCFLAGS='/MD', LIBS=['kernel32', 'user32', 'runtimeobject'])

Example 1 - Output fragment:

...
link /nologo /OUT:_build001\hello.exe kernel32.lib user32.lib runtimeobject.lib _build001\hello.obj
LINK : fatal error LNK1104: cannot open file 'MSVCRT.lib'
...

Example 2 - A Visual Studio 2022 build with user-defined script arguments and the script error policy set to issue a warning when msvc batch file errors are detected:

env = environment(MSVC_VERSION='14.3', MSVC_SCRIPT_ARGS=['8.1', 'store', '-vcvars_ver=14.1'], MSVC_SCRIPTERROR_POLICY='warn')
env.Program('hello', ['hello.c'], CCFLAGS='/MD', LIBS=['kernel32', 'user32', 'runtimeobject'])

Example 2 - Output fragment:

...
scons: warning: vc script errors detected:
[ERROR:vcvars.bat] The UWP Application Platform requires a Windows 10 SDK.
[ERROR:vcvars.bat] WindowsSdkDir = "C:\Program Files (x86)\Windows Kits\8.1\"
[ERROR:vcvars.bat] host/target architecture is not supported : { x64 , x64 }
...
link /nologo /OUT:_build001\hello.exe kernel32.lib user32.lib runtimeobject.lib _build001\hello.obj
LINK : fatal error LNK1104: cannot open file 'MSVCRT.lib'

Important usage details:

$MSVC_SCRIPTERROR_POLICY must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_SCRIPTERROR_POLICY must be set before the first msvc tool is loaded into the environment.
Due to scons implementation details, not all Windows system environment variables are propagated to the environment in which the msvc batch file is executed. Depending on Visual Studio version and installation options, non-fatal msvc batch file error messages may be generated for ancillary tools which may not affect builds with the msvc compiler. For this reason, caution is recommended when setting the script error policy to raise an exception (e.g., 'Error').

MSVC_SDK_VERSION

Build with a specific version of the Microsoft Software Development Kit (SDK).

The valid values for $MSVC_SDK_VERSION are: None or a string containing the requested SDK version (e.g., '10.0.20348.0').

$MSVC_SDK_VERSION is ignored when the value is None and when the value is an empty string. The validation conditions below do not apply.

An exception is raised when any of the following conditions are satisfied:

$MSVC_SDK_VERSION is specified for Visual Studio 2013 and earlier.

$MSVC_SDK_VERSION is specified and an SDK version argument is specified in $MSVC_SCRIPT_ARGS. Multiple SDK version declarations via $MSVC_SDK_VERSION and $MSVC_SCRIPT_ARGS are not allowed.
The $MSVC_SDK_VERSION specified does not match any of the supported formats:
- '10.0.XXXXX.Y' [SDK 10.0]
- '8.1' [SDK 8.1]
The system folder for the corresponding $MSVC_SDK_VERSION version is not found. The requested SDK version does not appear to be installed.
The $MSVC_SDK_VERSION version does not appear to support the requested platform type (i.e., UWP or Desktop). The requested SDK version platform type components do not appear to be installed.
The $MSVC_SDK_VERSION version is 8.1, the platform type is UWP, and the build tools selected are from Visual Studio 2017 and later (i.e., $MSVC_VERSION must be '14.0' or $MSVC_TOOLSET_VERSION must be '14.0').

Example 1 - A Visual Studio 2022 build with a specific Windows SDK version:

env = Environment(MSVC_VERSION='14.3', MSVC_SDK_VERSION='10.0.20348.0')

Example 2 - A Visual Studio 2022 build with a specific SDK version for the Universal Windows Platform:

env = Environment(MSVC_VERSION='14.3', MSVC_SDK_VERSION='10.0.20348.0', MSVC_UWP_APP=True)

Important usage details:

$MSVC_SDK_VERSION must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_SDK_VERSION must be set before the first msvc tool is loaded into the environment.
Should a SDK 10.0 version be installed that does not follow the naming scheme above, the SDK version will need to be specified via $MSVC_SCRIPT_ARGS until the version number validation format can be extended.
Should an exception be raised indicating that the SDK version is not found, verify that the requested SDK version is installed with the necessary platform type components.
There is a known issue with the Microsoft libraries when the target architecture is ARM64 and a Windows 11 SDK (version '10.0.22000.0' and later) is used with the v141 build tools and older v142 toolsets (versions '14.28.29333' and earlier). Should build failures arise with these combinations of settings due to unresolved symbols in the Microsoft libraries, $MSVC_SDK_VERSION may be employed to specify a Windows 10 SDK (e.g., '10.0.20348.0') for the build.

MSVC_SPECTRE_LIBS

Build with the spectre-mitigated Visual C++ libraries.

The valid values for $MSVC_SPECTRE_LIBS are: True, False, or None.

When $MSVC_SPECTRE_LIBS is enabled (i.e., True), the Visual C++ environment will include the paths to the spectre-mitigated implementations of the Microsoft Visual C++ libraries.

An exception is raised when any of the following conditions are satisfied:

$MSVC_SPECTRE_LIBS is enabled for Visual Studio 2015 and earlier.

$MSVC_SPECTRE_LIBS is enabled and a spectre library argument is specified in $MSVC_SCRIPT_ARGS. Multiple spectre library declarations via $MSVC_SPECTRE_LIBS and $MSVC_SCRIPT_ARGS are not allowed.
$MSVC_SPECTRE_LIBS is enabled and the platform type is UWP. There are no spectre-mitigated libraries for Universal Windows Platform (UWP) applications or components.

Example - A Visual Studio 2022 build with spectre mitigated Visual C++ libraries:

env = Environment(MSVC_VERSION='14.3', MSVC_SPECTRE_LIBS=True)

Important usage details:

$MSVC_SPECTRE_LIBS must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_SPECTRE_LIBS must be set before the first msvc tool is loaded into the environment.
Additional compiler switches (e.g., /Qspectre) are necessary for including spectre mitigations when building user artifacts. Refer to the Visual Studio documentation for details.
The existence of the spectre libraries host architecture and target architecture folders are not verified when $MSVC_SPECTRE_LIBS is enabled which could result in build failures. The burden is on the user to ensure the requisite libraries with spectre mitigations are installed.

MSVC_TOOLSET_VERSION

Build with a specific Visual C++ toolset version.

Specifying $MSVC_TOOLSET_VERSION does not affect the autodetection and selection of msvc instances. The $MSVC_TOOLSET_VERSION is applied after an msvc instance is selected. This could be the default version of msvc if $MSVC_VERSION is not specified.

The valid values for $MSVC_TOOLSET_VERSION are: None or a string containing the requested toolset version (e.g., '14.29').

$MSVC_TOOLSET_VERSION is ignored when the value is None and when the value is an empty string. The validation conditions below do not apply.

An exception is raised when any of the following conditions are satisfied:

$MSVC_TOOLSET_VERSION is specified for Visual Studio 2015 and earlier.
$MSVC_TOOLSET_VERSION is specified and a toolset version argument is specified in $MSVC_SCRIPT_ARGS. Multiple toolset version declarations via $MSVC_TOOLSET_VERSION and $MSVC_SCRIPT_ARGS are not allowed.
The $MSVC_TOOLSET_VERSION specified does not match any of the supported formats:
- 'XX.Y'
- 'XX.YY'
- 'XX.YY.ZZZZZ'
- 'XX.YY.Z' to 'XX.YY.ZZZZ' [scons extension not directly supported by the msvc batch files and may be removed in the future]
- 'XX.YY.ZZ.N' [SxS format]
- 'XX.YY.ZZ.NN' [SxS format]
The major msvc version prefix (i.e., 'XX.Y') of the $MSVC_TOOLSET_VERSION specified is for Visual Studio 2013 and earlier (e.g., '12.0').
The major msvc version prefix (i.e., 'XX.Y') of the $MSVC_TOOLSET_VERSION specified is greater than the msvc version selected (e.g., '99.0').
A system folder for the corresponding $MSVC_TOOLSET_VERSION version is not found. The requested toolset version does not appear to be installed.

Toolset selection details:

When $MSVC_TOOLSET_VERSION is not an SxS version number or a full toolset version number: the first toolset version, ranked in descending order, that matches the $MSVC_TOOLSET_VERSION prefix is selected.
When $MSVC_TOOLSET_VERSION is specified using the major msvc version prefix (i.e., 'XX.Y') and the major msvc version is that of the latest release of Visual Studio, the selected toolset version may not be the same as the default Visual C++ toolset version.

In the latest release of Visual Studio, the default Visual C++ toolset version is not necessarily the toolset with the largest version number.

Example 1 - A default Visual Studio build with a partial toolset version specified:

env = Environment(MSVC_TOOLSET_VERSION='14.2')

Example 2 - A default Visual Studio build with a partial toolset version specified:

env = Environment(MSVC_TOOLSET_VERSION='14.29')

Example 3 - A Visual Studio 2022 build with a full toolset version specified:

env = Environment(MSVC_VERSION='14.3', MSVC_TOOLSET_VERSION='14.29.30133')

Example 4 - A Visual Studio 2022 build with an SxS toolset version specified:

env = Environment(MSVC_VERSION='14.3', MSVC_TOOLSET_VERSION='14.29.16.11')

Important usage details:

$MSVC_TOOLSET_VERSION must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_TOOLSET_VERSION must be set before the first msvc tool is loaded into the environment.
The existence of the toolset host architecture and target architecture folders are not verified when $MSVC_TOOLSET_VERSION is specified which could result in build failures. The burden is on the user to ensure the requisite toolset target architecture build tools are installed.

MSVC_USE_SCRIPT

Use a batch script to set up the Microsoft Visual C++ compiler.

If set to the name of a Visual Studio .bat file (e.g. vcvars.bat), SCons will run that batch file instead of the auto-detected one, and extract the relevant variables from the result (typically %INCLUDE%, %LIB%, and %PATH%) for supplying to the build. This can be useful to force the use of a compiler version that SCons does not detect. $MSVC_USE_SCRIPT_ARGS provides arguments passed to this script.

Setting $MSVC_USE_SCRIPT to None bypasses the Visual Studio autodetection entirely; use this if you are running SCons in a Visual Studio cmd window and importing the shell's environment variables - that is, if you are sure everything is set correctly already and you don't want SCons to change anything.

$MSVC_USE_SCRIPT ignores $MSVC_VERSION and $TARGET_ARCH.

MSVC_USE_SCRIPT_ARGS

Provides arguments passed to the script $MSVC_USE_SCRIPT.

MSVC_USE_SETTINGS

Use a dictionary to set up the Microsoft Visual C++ compiler.

$MSVC_USE_SETTINGS is ignored when $MSVC_USE_SCRIPT is defined and/or when $MSVC_USE_SETTINGS is set to None.

The dictionary is used to populate the environment with the relevant variables (typically %INCLUDE%, %LIB%, and %PATH%) for supplying to the build. This can be useful to force the use of a compiler environment that SCons does not configure correctly. This is an alternative to manually configuring the environment when bypassing Visual Studio autodetection entirely by setting $MSVC_USE_SCRIPT to None.

Here is an example of configuring a build environment using the Microsoft Visual C/C++ compiler included in the Microsoft SDK on a 64-bit host and building for a 64-bit architecture:

# Microsoft SDK 6.0 (MSVC 8.0): 64-bit host and 64-bit target
msvc_use_settings = {
    "PATH": [
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\VC\\Bin\\x64",
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\Bin\\x64",
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\Bin",
        "C:\\Windows\\Microsoft.NET\\Framework\\v2.0.50727",
        "C:\\Windows\\system32",
        "C:\\Windows",
        "C:\\Windows\\System32\\Wbem",
        "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\"
    ],
    "INCLUDE": [
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\VC\\Include",
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\VC\\Include\\Sys",
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\Include",
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\Include\\gl",
    ],
    "LIB": [
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\VC\\Lib\\x64",
        "C:\\Program Files\\Microsoft SDKs\\Windows\\v6.0\\Lib\\x64",
    ],
    "LIBPATH": [],
    "VSCMD_ARG_app_plat": [],
    "VCINSTALLDIR": [],
    "VCToolsInstallDir": []
}

# Specifying MSVC_VERSION is recommended
env = Environment(MSVC_VERSION='8.0', MSVC_USE_SETTINGS=msvc_use_settings)

Important usage details:

$MSVC_USE_SETTINGS must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_USE_SETTINGS must be set before the first msvc tool is loaded into the environment.
The dictionary content requirements are based on the internal msvc implementation and therefore may change at any time. The burden is on the user to ensure the dictionary contents are minimally sufficient to ensure successful builds.

MSVC_UWP_APP

Build with the Universal Windows Platform (UWP) application Visual C++ libraries.

The valid values for $MSVC_UWP_APP are: True, '1', False, '0', or None.

When $MSVC_UWP_APP is enabled (i.e., True or '1'), the Visual C++ environment will be set up to point to the Windows Store compatible libraries and Visual C++ runtimes. In doing so, any libraries that are built will be able to be used in a UWP App and published to the Windows Store.

An exception is raised when any of the following conditions are satisfied:

$MSVC_UWP_APP is enabled for Visual Studio 2013 and earlier.

$MSVC_UWP_APP is enabled and a UWP argument is specified in $MSVC_SCRIPT_ARGS. Multiple UWP declarations via $MSVC_UWP_APP and $MSVC_SCRIPT_ARGS are not allowed.

Example - A Visual Studio 2022 build for the Universal Windows Platform:

env = Environment(MSVC_VERSION='14.3', MSVC_UWP_APP=True)

Important usage details:

$MSVC_UWP_APP must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_UWP_APP must be set before the first msvc tool is loaded into the environment.
The existence of the UWP libraries is not verified when $MSVC_UWP_APP is enabled which could result in build failures. The burden is on the user to ensure the requisite UWP libraries are installed.

MSVC_VERSION

Sets the preferred version of Microsoft Visual C/C++ to use.

If $MSVC_VERSION is not set, SCons will (by default) select the latest version of Visual C/C++ installed on your system. If the specified version isn't installed, tool initialization will fail.

$MSVC_VERSION must be passed as an argument to the Environment constructor when an msvc tool (e.g., msvc, msvs, etc.) is loaded via the default tools list or via a tools list passed to the Environment constructor. Otherwise, $MSVC_VERSION must be set before the first msvc tool is loaded into the environment.

Valid values for Windows are 14.3, 14.2, 14.1, 14.1Exp, 14.0, 14.0Exp, 12.0, 12.0Exp, 11.0, 11.0Exp, 10.0, 10.0Exp, 9.0, 9.0Exp, 8.0, 8.0Exp, 7.1, 7.0, and 6.0. Versions ending in Exp refer to "Express" or "Express for Desktop" editions.

MSVS

When the Microsoft Visual Studio tools are initialized, they set up this dictionary with the following keys:

VERSION

If a value is not set, it was not available in the registry.

MSVS_ARCH

Sets the architecture for which the generated project(s) should build.

The default value is x86. amd64 is also supported by SCons for most Visual Studio versions. Since Visual Studio 2015 arm is supported, and since Visual Studio 2017 arm64 is supported. Trying to set $MSVS_ARCH to an architecture that's not supported for a given Visual Studio version will generate an error.

MSVS_PROJECT_GUID

The string placed in a generated Microsoft Visual Studio project file as the value of the ProjectGUID attribute. There is no default value. If not defined, a new GUID is generated.

MSVS_SCC_AUX_PATH

The path name placed in a generated Microsoft Visual Studio project file as the value of the SccAuxPath attribute if the MSVS_SCC_PROVIDER construction variable is also set. There is no default value.

MSVS_SCC_CONNECTION_ROOT

The root path of projects in your SCC workspace, i.e the path under which all project and solution files will be generated. It is used as a reference path from which the relative paths of the generated Microsoft Visual Studio project and solution files are computed. The relative project file path is placed as the value of the SccLocalPath attribute of the project file and as the values of the SccProjectFilePathRelativizedFromConnection[i] (where [i] ranges from 0 to the number of projects in the solution) attributes of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. Similarly the relative solution file path is placed as the values of the SccLocalPath[i] (where [i] ranges from 0 to the number of projects in the solution) attributes of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. This is used only if the MSVS_SCC_PROVIDER construction variable is also set. The default value is the current working directory.

MSVS_SCC_PROJECT_NAME

The project name placed in a generated Microsoft Visual Studio project file as the value of the SccProjectName attribute if the MSVS_SCC_PROVIDER construction variable is also set. In this case the string is also placed in the SccProjectName0 attribute of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. There is no default value.

MSVS_SCC_PROVIDER

The string placed in a generated Microsoft Visual Studio project file as the value of the SccProvider attribute. The string is also placed in the SccProvider0 attribute of the GlobalSection(SourceCodeControl) section of the Microsoft Visual Studio solution file. There is no default value.

MSVS_VERSION

Sets the preferred version of Microsoft Visual Studio to use.

If $MSVS_VERSION is not set, SCons will (by default) select the latest version of Visual Studio installed on your system. So, if you have version 6 and version 7 (MSVS .NET) installed, it will prefer version 7. You can override this by specifying the MSVS_VERSION variable in the Environment initialization, setting it to the appropriate version ('6.0' or '7.0', for example). If the specified version isn't installed, tool initialization will fail.

This is obsolete: use $MSVC_VERSION instead. If $MSVS_VERSION is set and $MSVC_VERSION is not, $MSVC_VERSION will be set automatically to $MSVS_VERSION. If both are set to different values, scons will raise an error.

MSVSBUILDCOM

The build command line placed in a generated Microsoft Visual Studio project file. The default is to have Visual Studio invoke SCons with any specified build targets.

MSVSCLEANCOM

The clean command line placed in a generated Microsoft Visual Studio project file. The default is to have Visual Studio invoke SCons with the -c option to remove any specified targets.

MSVSENCODING

The encoding string placed in a generated Microsoft Visual Studio project file. The default is encoding Windows-1252.

MSVSPROJECTCOM

The action used to generate Microsoft Visual Studio project files.

MSVSPROJECTSUFFIX

The suffix used for Microsoft Visual Studio project (DSP) files. The default value is .vcproj when using Visual Studio version 7.x (.NET) or later version, and .dsp when using earlier versions of Visual Studio.

MSVSREBUILDCOM

The rebuild command line placed in a generated Microsoft Visual Studio project file. The default is to have Visual Studio invoke SCons with any specified rebuild targets.

MSVSSCONS

The SCons used in generated Microsoft Visual Studio project files. The default is the version of SCons being used to generate the project file.

MSVSSCONSCOM

The default SCons command used in generated Microsoft Visual Studio project files.

MSVSSCONSCRIPT

The sconscript file (that is, SConstruct or SConscript file) that will be invoked by Visual Studio project files (through the $MSVSSCONSCOM variable). The default is the same sconscript file that contains the call to MSVSProject to build the project file.

MSVSSCONSFLAGS

The SCons flags used in generated Microsoft Visual Studio project files.

MSVSSOLUTIONCOM

The action used to generate Microsoft Visual Studio solution files.

MSVSSOLUTIONSUFFIX

The suffix used for Microsoft Visual Studio solution (DSW) files. The default value is .sln when using Visual Studio version 7.x (.NET), and .dsw when using earlier versions of Visual Studio.

MT

The program used on Windows systems to embed manifests into DLLs and EXEs. See also $WINDOWS_EMBED_MANIFEST.

MTEXECOM

The Windows command line used to embed manifests into executables. See also $MTSHLIBCOM.

MTFLAGS

Flags passed to the $MT manifest embedding program (Windows only).

MTSHLIBCOM

The Windows command line used to embed manifests into shared libraries (DLLs). See also $MTEXECOM.

MWCW_VERSION

The version number of the MetroWerks CodeWarrior C compiler to be used.

MWCW_VERSIONS

A list of installed versions of the MetroWerks CodeWarrior C compiler on this system.

NAME

Specfies the name of the project to package.

See the Package builder.

NINJA_ALIAS_NAME

The name of the alias target which will cause SCons to create the ninja build file, and then (optionally) run ninja. The default value is generate-ninja.

NINJA_CMD_ARGS

A string which will pass arguments through SCons to the ninja command when scons executes ninja. Has no effect if $NINJA_DISABLE_AUTO_RUN is set.

This value can also be passed on the command line:

scons NINJA_CMD_ARGS=-v
or
scons NINJA_CMD_ARGS="-v -j 3"

NINJA_COMPDB_EXPAND

Boolean value to instruct ninja to expand the command line arguments normally put into response files. If true, prevents unexpanded lines in the compilation database like “gcc @rsp_file” and instead yields expanded lines like “gcc -c -o myfile.o myfile.c -Ia -DXYZ”.

Ninja's compdb tool added the -x flag in Ninja V1.9.0

NINJA_DEPFILE_PARSE_FORMAT

Determines the type of format ninja should expect when parsing header include depfiles. Can be msvc, gcc, or clang. The msvc option corresponds to /showIncludes format, and gcc or clang correspond to -MMD -MF.

NINJA_DIR

The builddir value. Propagates directly into the generated ninja build file. From Ninja's docs: “ A directory for some Ninja output files. ... (You can also store other build output in this directory.) ” The default value is .ninja.

NINJA_DISABLE_AUTO_RUN

Boolean. Default: False. If true, SCons will not run ninja automatically after creating the ninja build file.

If not explicitly set, this will be set to True if --disable_execute_ninja or SetOption('disable_execute_ninja', True) is seen.

NINJA_ENV_VAR_CACHE

A string that sets the environment for any environment variables that differ between the OS environment and the SCons execution environment.

It will be compatible with the default shell of the operating system.

If not explicitly set, SCons will generate this dynamically from the execution environment stored in the current construction environment (e.g. env['ENV']) where those values differ from the existing shell..

NINJA_FILE_NAME

The filename for the generated Ninja build file. The default is ninja.build.

NINJA_FORCE_SCONS_BUILD

If true, causes the build nodes to callback to scons instead of using ninja to build them. This is intended to be passed to the environment on the builder invocation. It is useful if you have a build node which does something which is not easily translated into ninja.

NINJA_GENERATED_SOURCE_ALIAS_NAME

A string matching the name of a user defined alias which represents a list of all generated sources. This will prevent the auto-detection of generated sources from $NINJA_GENERATED_SOURCE_SUFFIXES. Then all other source files will be made to depend on this in the ninja build file, forcing the generated sources to be built first.

NINJA_GENERATED_SOURCE_SUFFIXES

The list of source file suffixes which are generated by SCons build steps. All source files which match these suffixes will be added to the _generated_sources alias in the output ninja build file. Then all other source files will be made to depend on this in the ninja build file, forcing the generated sources to be built first.

NINJA_MSVC_DEPS_PREFIX

The msvc_deps_prefix string. Propagates directly into the generated ninja build file. From Ninja's docs: “defines the string which should be stripped from msvc's /showIncludes output”

NINJA_POOL

Set the ninja_pool for this or all targets in scope for this env var.

NINJA_REGENERATE_DEPS

A generator function used to create a ninja depfile which includes all the files which would require SCons to be invoked if they change. Or a list of said files.

_NINJA_REGENERATE_DEPS_FUNC

Internal value used to specify the function to call with argument env to generate the list of files which if changed would require the ninja build file to be regenerated.

NINJA_SCONS_DAEMON_KEEP_ALIVE

The number of seconds for the SCons deamon launched by ninja to stay alive. (Default: 180000)

NINJA_SCONS_DAEMON_PORT

The TCP/IP port for the SCons daemon to listen on. NOTE: You cannot use a port already being listened to on your build machine. (Default: random number between 10000,60000)

NINJA_SYNTAX

The path to a custom ninja_syntax.py file which is used in generation. The tool currently assumes you have ninja installed as a Python module and grabs the syntax file from that installation if $NINJA_SYNTAX is not explicitly set.

no_import_lib

When set to non-zero, suppresses creation of a corresponding Windows static import lib by the SharedLibrary builder when used with MinGW, Microsoft Visual Studio or Metrowerks. This also suppresses creation of an export (.exp) file when using Microsoft Visual Studio.

OBJPREFIX

The prefix used for (static) object file names.

OBJSUFFIX

The suffix used for (static) object file names.

PACKAGEROOT

Specifies the directory where all files in resulting archive will be placed if applicable. The default value is “$NAME-$VERSION”.

See the Package builder.

PACKAGETYPE

Selects the package type to build when using the Package builder. May be a string or list of strings. See the docuentation for the builder for the currently supported types.

$PACKAGETYPE may be overridden with the --package-type command line option.

See the Package builder.

PACKAGEVERSION

The version of the package (not the underlying project). This is currently only used by the rpm packager and should reflect changes in the packaging, not the underlying project code itself.

See the Package builder.

PCH

The Microsoft Visual C++ precompiled header that will be used when compiling object files. This variable is ignored by tools other than Microsoft Visual C++. When this variable is defined SCons will add options to the compiler command line to cause it to use the precompiled header, and will also set up the dependencies for the PCH file. Example:

env['PCH'] = File('StdAfx.pch')

PCHCOM

The command line used by the PCH builder to generated a precompiled header.

PCHCOMSTR

The string displayed when generating a precompiled header. If this is not set, then $PCHCOM (the command line) is displayed.

PCHPDBFLAGS

A construction variable that, when expanded, adds the /yD flag to the command line only if the $PDB construction variable is set.

PCHSTOP

This variable specifies how much of a source file is precompiled. This variable is ignored by tools other than Microsoft Visual C++, or when the PCH variable is not being used. When this variable is define it must be a string that is the name of the header that is included at the end of the precompiled portion of the source files, or the empty string if the "#pragma hrdstop" construct is being used:

env['PCHSTOP'] = 'StdAfx.h'

PDB

The Microsoft Visual C++ PDB file that will store debugging information for object files, shared libraries, and programs. This variable is ignored by tools other than Microsoft Visual C++. When this variable is defined SCons will add options to the compiler and linker command line to cause them to generate external debugging information, and will also set up the dependencies for the PDB file. Example:

env['PDB'] = 'hello.pdb'

The Visual C++ compiler switch that SCons uses by default to generate PDB information is /Z7. This works correctly with parallel (-j) builds because it embeds the debug information in the intermediate object files, as opposed to sharing a single PDB file between multiple object files. This is also the only way to get debug information embedded into a static library. Using the /Zi instead may yield improved link-time performance, although parallel builds will no longer work. You can generate PDB files with the /Zi switch by overriding the default $CCPDBFLAGS variable; see the entry for that variable for specific examples.

PDFLATEX

The pdflatex utility.

PDFLATEXCOM

The command line used to call the pdflatex utility.

PDFLATEXCOMSTR

The string displayed when calling the pdflatex utility. If this is not set, then $PDFLATEXCOM (the command line) is displayed.

env = Environment(PDFLATEX;COMSTR = "Building $TARGET from LaTeX input $SOURCES")

PDFLATEXFLAGS

General options passed to the pdflatex utility.

PDFPREFIX

The prefix used for PDF file names.

PDFSUFFIX

The suffix used for PDF file names.

PDFTEX

The pdftex utility.

PDFTEXCOM

The command line used to call the pdftex utility.

PDFTEXCOMSTR

The string displayed when calling the pdftex utility. If this is not set, then $PDFTEXCOM (the command line) is displayed.

env = Environment(PDFTEXCOMSTR = "Building $TARGET from TeX input $SOURCES")

PDFTEXFLAGS

General options passed to the pdftex utility.

PKGCHK

On Solaris systems, the package-checking program that will be used (along with $PKGINFO) to look for installed versions of the Sun PRO C++ compiler. The default is /usr/sbin/pgkchk.

PKGINFO

On Solaris systems, the package information program that will be used (along with $PKGCHK) to look for installed versions of the Sun PRO C++ compiler. The default is pkginfo.

PLATFORM

The name of the platform used to create this construction environment. SCons sets this when initializing the platform, which by default is auto-detected (see the platform argument to Environment).

env = Environment(tools=[])
if env['PLATFORM'] == 'cygwin':
    Tool('mingw')(env)
else:
    Tool('msvc')(env)

POAUTOINIT

The $POAUTOINIT variable, if set to True (on non-zero numeric value), let the msginit tool to automatically initialize missing PO files with msginit(1). This applies to both, POInit and POUpdate builders (and others that use any of them).

POCREATE_ALIAS

Common alias for all PO files created with POInit builder (default: 'po-create'). See msginit tool and POInit builder.

POSUFFIX

Suffix used for PO files (default: '.po') See msginit tool and POInit builder.

POTDOMAIN

The $POTDOMAIN defines default domain, used to generate POT filename as $POTDOMAIN.pot when no POT file name is provided by the user. This applies to POTUpdate, POInit and POUpdate builders (and builders, that use them, e.g. Translate). Normally (if $POTDOMAIN is not defined), the builders use messages.pot as default POT file name.

POTSUFFIX

Suffix used for PO Template files (default: '.pot'). See xgettext tool and POTUpdate builder.

POTUPDATE_ALIAS

Name of the common phony target for all PO Templates created with POUpdate (default: 'pot-update'). See xgettext tool and POTUpdate builder.

POUPDATE_ALIAS

Common alias for all PO files being defined with POUpdate builder (default: 'po-update'). See msgmerge tool and POUpdate builder.

PRINT_CMD_LINE_FUNC

A Python function used to print the command lines as they are executed (assuming command printing is not disabled by the -q or -s options or their equivalents). The function must accept four arguments: s, target, source and env. s is a string showing the command being executed, target, is the target being built (file node, list, or string name(s)), source, is the source(s) used (file node, list, or string name(s)), and env is the environment being used.

The function must do the printing itself. The default implementation, used if this variable is not set or is None, is to just print the string, as in:

def print_cmd_line(s, target, source, env):
    sys.stdout.write(s + "\n")

Here is an example of a more interesting function:

def print_cmd_line(s, target, source, env):
    sys.stdout.write(
        "Building %s -> %s...\n"
        % (
            ' and '.join([str(x) for x in source]),
            ' and '.join([str(x) for x in target]),
        )
    )

env = Environment(PRINT_CMD_LINE_FUNC=print_cmd_line)
env.Program('foo', ['foo.c', 'bar.c'])

This prints:

...
scons: Building targets ...
Building bar.c -> bar.o...
Building foo.c -> foo.o...
Building foo.o and bar.o -> foo...
scons: done building targets.

Another example could be a function that logs the actual commands to a file.

PROGEMITTER

Contains the emitter specification for the Program builder. The manpage section "Builder Objects" contains general information on specifying emitters.

PROGPREFIX

The prefix used for executable file names.

PROGSUFFIX

The suffix used for executable file names.

PSCOM

The command line used to convert TeX DVI files into a PostScript file.

PSCOMSTR

The string displayed when a TeX DVI file is converted into a PostScript file. If this is not set, then $PSCOM (the command line) is displayed.

PSPREFIX

The prefix used for PostScript file names.

PSSUFFIX

The prefix used for PostScript file names.

QT_AUTOSCAN

Turn off scanning for mocable files. Use the Moc Builder to explicitly specify files to run moc on.

QT_BINPATH

The path where the Qt binaries are installed. The default value is '$QTDIR/bin'.

QT_CPPPATH

The path where the Qt header files are installed. The default value is '$QTDIR/include'. Note: If you set this variable to None, the tool won't change the $CPPPATH construction variable.

QT_DEBUG

Prints lots of debugging information while scanning for moc files.

QT_LIB

Default value is 'qt'. You may want to set this to 'qt-mt'. Note: If you set this variable to None, the tool won't change the $LIBS variable.

QT_LIBPATH

The path where the Qt libraries are installed. The default value is '$QTDIR/lib'. Note: If you set this variable to None, the tool won't change the $LIBPATH construction variable.

QT_MOC

Default value is '$QT_BINPATH/moc'.

QT_MOCCXXPREFIX

Default value is ''. Prefix for moc output files when source is a C++ file.

QT_MOCCXXSUFFIX

Default value is '.moc'. Suffix for moc output files when source is a C++ file.

QT_MOCFROMCXXCOM

Command to generate a moc file from a C++ file.

QT_MOCFROMCXXCOMSTR

The string displayed when generating a moc file from a C++ file. If this is not set, then $QT_MOCFROMCXXCOM (the command line) is displayed.

QT_MOCFROMCXXFLAGS

Default value is '-i'. These flags are passed to moc when moccing a C++ file.

QT_MOCFROMHCOM

Command to generate a moc file from a header.

QT_MOCFROMHCOMSTR

The string displayed when generating a moc file from a C++ file. If this is not set, then $QT_MOCFROMHCOM (the command line) is displayed.

QT_MOCFROMHFLAGS

Default value is ''. These flags are passed to moc when moccing a header file.

QT_MOCHPREFIX

Default value is 'moc_'. Prefix for moc output files when source is a header.

QT_MOCHSUFFIX

Default value is '$CXXFILESUFFIX'. Suffix for moc output files when source is a header.

QT_UIC

Default value is '$QT_BINPATH/uic'.

QT_UICCOM

Command to generate header files from .ui files.

QT_UICCOMSTR

The string displayed when generating header files from .ui files. If this is not set, then $QT_UICCOM (the command line) is displayed.

QT_UICDECLFLAGS

Default value is ''. These flags are passed to uic when creating a header file from a .ui file.

QT_UICDECLPREFIX

Default value is ''. Prefix for uic generated header files.

QT_UICDECLSUFFIX

Default value is '.h'. Suffix for uic generated header files.

QT_UICIMPLFLAGS

Default value is ''. These flags are passed to uic when creating a C++ file from a .ui file.

QT_UICIMPLPREFIX

Default value is 'uic_'. Prefix for uic generated implementation files.

QT_UICIMPLSUFFIX

Default value is '$CXXFILESUFFIX'. Suffix for uic generated implementation files.

QT_UISUFFIX

Default value is '.ui'. Suffix of designer input files.

QTDIR

The path to the Qt installation to build against. If not already set, qt tool tries to obtain this from os.environ; if not found there, it tries to make a guess.

RANLIB

The archive indexer.

RANLIBCOM

The command line used to index a static library archive.

RANLIBCOMSTR

The string displayed when a static library archive is indexed. If this is not set, then $RANLIBCOM (the command line) is displayed.

env = Environment(RANLIBCOMSTR = "Indexing $TARGET")

RANLIBFLAGS

General options passed to the archive indexer.

RC

The resource compiler used to build a Microsoft Visual C++ resource file.

RCCOM

The command line used to build a Microsoft Visual C++ resource file.

RCCOMSTR

The string displayed when invoking the resource compiler to build a Microsoft Visual C++ resource file. If this is not set, then $RCCOM (the command line) is displayed.

RCFLAGS

The flags passed to the resource compiler by the RES builder.

RCINCFLAGS

An automatically-generated construction variable containing the command-line options for specifying directories to be searched by the resource compiler. The value of $RCINCFLAGS is created by respectively prepending and appending $RCINCPREFIX and $RCINCSUFFIX to the beginning and end of each directory in $CPPPATH.

RCINCPREFIX

The prefix (flag) used to specify an include directory on the resource compiler command line. This will be prepended to the beginning of each directory in the $CPPPATH construction variable when the $RCINCFLAGS variable is expanded.

RCINCSUFFIX

The suffix used to specify an include directory on the resource compiler command line. This will be appended to the end of each directory in the $CPPPATH construction variable when the $RCINCFLAGS variable is expanded.

RDirs

A function that converts a string into a list of Dir instances by searching the repositories.

REGSVR

The program used on Windows systems to register a newly-built DLL library whenever the SharedLibrary builder is passed a keyword argument of register=True.

REGSVRCOM

The command line used on Windows systems to register a newly-built DLL library whenever the SharedLibrary builder is passed a keyword argument of register=True.

REGSVRCOMSTR

The string displayed when registering a newly-built DLL file. If this is not set, then $REGSVRCOM (the command line) is displayed.

REGSVRFLAGS

Flags passed to the DLL registration program on Windows systems when a newly-built DLL library is registered. By default, this includes the /s that prevents dialog boxes from popping up and requiring user attention.

RMIC

The Java RMI stub compiler.

RMICCOM

The command line used to compile stub and skeleton class files from Java classes that contain RMI implementations. Any options specified in the $RMICFLAGS construction variable are included on this command line.

RMICCOMSTR

The string displayed when compiling stub and skeleton class files from Java classes that contain RMI implementations. If this is not set, then $RMICCOM (the command line) is displayed.

env = Environment(RMICCOMSTR = "Generating stub/skeleton class files $TARGETS from $SOURCES")

RMICFLAGS

General options passed to the Java RMI stub compiler.

RPATH

A list of paths to search for shared libraries when running programs. Currently only used in the GNU (gnulink), IRIX (sgilink) and Sun (sunlink) linkers. Ignored on platforms and toolchains that don't support it. Note that the paths added to RPATH are not transformed by scons in any way: if you want an absolute path, you must make it absolute yourself.

_RPATH

An automatically-generated construction variable containing the rpath flags to be used when linking a program with shared libraries. The value of $_RPATH is created by respectively prepending $RPATHPREFIX and appending $RPATHSUFFIX to the beginning and end of each directory in $RPATH.

RPATHPREFIX

The prefix used to specify a directory to be searched for shared libraries when running programs. This will be prepended to the beginning of each directory in the $RPATH construction variable when the $_RPATH variable is automatically generated.

RPATHSUFFIX

The suffix used to specify a directory to be searched for shared libraries when running programs. This will be appended to the end of each directory in the $RPATH construction variable when the $_RPATH variable is automatically generated.

RPCGEN

The RPC protocol compiler.

RPCGENCLIENTFLAGS

Options passed to the RPC protocol compiler when generating client side stubs. These are in addition to any flags specified in the $RPCGENFLAGS construction variable.

RPCGENFLAGS

General options passed to the RPC protocol compiler.

RPCGENHEADERFLAGS

Options passed to the RPC protocol compiler when generating a header file. These are in addition to any flags specified in the $RPCGENFLAGS construction variable.

RPCGENSERVICEFLAGS

Options passed to the RPC protocol compiler when generating server side stubs. These are in addition to any flags specified in the $RPCGENFLAGS construction variable.

RPCGENXDRFLAGS

Options passed to the RPC protocol compiler when generating XDR routines. These are in addition to any flags specified in the $RPCGENFLAGS construction variable.

SCANNERS

A list of the available implicit dependency scanners. New file scanners may be added by appending to this list, although the more flexible approach is to associate scanners with a specific Builder. See the manpage sections "Builder Objects" and "Scanner Objects" for more information.

SCONS_HOME

The (optional) path to the SCons library directory, initialized from the external environment. If set, this is used to construct a shorter and more efficient search path in the $MSVSSCONS command line executed from Microsoft Visual Studio project files.

SHCC

The C compiler used for generating shared-library objects. See also $CC for compiling to static objects.

SHCCCOM

The command line used to compile a C source file to a shared-library object file. Any options specified in the $SHCFLAGS, $SHCCFLAGS and $CPPFLAGS construction variables are included on this command line. See also $CCCOM for compiling to static objects.

SHCCCOMSTR

If set, the string displayed when a C source file is compiled to a shared object file. If not set, then $SHCCCOM (the command line) is displayed. See also $CCCOMSTR for compiling to static objects.

env = Environment(SHCCCOMSTR = "Compiling shared object $TARGET")

SHCCFLAGS

Options that are passed to the C and C++ compilers to generate shared-library objects. See also $CCFLAGS for compiling to static objects.

SHCFLAGS

Options that are passed to the C compiler (only; not C++) to generate shared-library objects. See also $CFLAGS for compiling to static objects.

SHCXX

The C++ compiler used for generating shared-library objects. See also $CXX for compiling to static objects.

SHCXXCOM

The command line used to compile a C++ source file to a shared-library object file. Any options specified in the $SHCXXFLAGS and $CPPFLAGS construction variables are included on this command line. See also $CXXCOM for compiling to static objects.

SHCXXCOMSTR

If set, the string displayed when a C++ source file is compiled to a shared object file. If not set, then $SHCXXCOM (the command line) is displayed. See also $CXXCOMSTR for compiling to static objects.

env = Environment(SHCXXCOMSTR = "Compiling shared object $TARGET")

SHCXXFLAGS

Options that are passed to the C++ compiler to generate shared-library objects. See also $CXXFLAGS for compiling to static objects.

SHDC

The name of the compiler to use when compiling D source destined to be in a shared objects. See also $DC for compiling to static objects.

SHDCOM

The command line to use when compiling code to be part of shared objects. See also $DCOM for compiling to static objects.

SHDCOMSTR

If set, the string displayed when a D source file is compiled to a (shared) object file. If not set, then $SHDCOM (the command line) is displayed. See also $DCOMSTR for compiling to static objects.

SHDLIBVERSIONFLAGS

Extra flags added to $SHDLINKCOM when building versioned SharedLibrary. These flags are only used when $SHLIBVERSION is set.

SHDLINK

The linker to use when creating shared objects for code bases include D sources. See also $DLINK for linking static objects.

SHDLINKCOM

The command line to use when generating shared objects. See also $DLINKCOM for linking static objects.

SHDLINKFLAGS

The list of flags to use when generating a shared object. See also $DLINKFLAGS for linking static objects.

SHELL

A string naming the shell program that will be passed to the $SPAWN function. See the $SPAWN construction variable for more information.

SHELL_ENV_GENERATORS

Must be a list (or an iterable) containing functions where each function generates or alters the environment dictionary which will be used when executing the $SPAWN function. The functions will initially be passed a reference of the current execution environment (e.g. env['ENV']), and each called while iterating the list. Each function must return a dictionary which will then be passed to the next function iterated. The return dictionary should contain keys which represent the environment variables and their respective values. This primary purpose of this construction variable is to give the user the ability to substitute execution environment variables based on env, targets, and sources. If desired, the user can completely customize the execution environment for particular targets.

def custom_shell_env(env, target, source, shell_env):
    """customize shell_env if desired"""
    if str(target[0]) == 'special_target':
        shell_env['SPECIAL_VAR'] = env.subst('SOME_VAR', target=target, source=source)
    return shell_env

env["SHELL_ENV_GENERATORS"] = [custom_shell_env]

env The SCons construction environment from which the execution environment can be derived from.

target The list of targets associated with this action.

source The list of sources associated with this action.

shell_env The current shell_env after iterating other SHELL_ENV_GENERATORS functions. This can be compared to the passed env['ENV'] to detect any changes.

SHF03

The Fortran 03 compiler used for generating shared-library objects. You should normally set the $SHFORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF03 if you need to use a specific compiler or compiler version for Fortran 03 files.

SHF03COM

The command line used to compile a Fortran 03 source file to a shared-library object file. You only need to set $SHF03COM if you need to use a specific command line for Fortran 03 files. You should normally set the $SHFORTRANCOM variable, which specifies the default command line for all Fortran versions.

SHF03COMSTR

If set, the string displayed when a Fortran 03 source file is compiled to a shared-library object file. If not set, then $SHF03COM or $SHFORTRANCOM (the command line) is displayed.

SHF03FLAGS

Options that are passed to the Fortran 03 compiler to generated shared-library objects. You only need to set $SHF03FLAGS if you need to define specific user options for Fortran 03 files. You should normally set the $FORTRANCOMMONFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

SHF03PPCOM

The command line used to compile a Fortran 03 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF03FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $SHF03PPCOM if you need to use a specific C-preprocessor command line for Fortran 03 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

SHF03PPCOMSTR

If set, the string displayed when a Fortran 03 source file is compiled to a shared-library object file after first running the file through the C preprocessor. If not set, then $SHF03PPCOM or $SHFORTRANPPCOM (the command line) is displayed.

SHF08

The Fortran 08 compiler used for generating shared-library objects. You should normally set the $SHFORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF08 if you need to use a specific compiler or compiler version for Fortran 08 files.

SHF08COM

The command line used to compile a Fortran 08 source file to a shared-library object file. You only need to set $SHF08COM if you need to use a specific command line for Fortran 08 files. You should normally set the $SHFORTRANCOM variable, which specifies the default command line for all Fortran versions.

SHF08COMSTR

If set, the string displayed when a Fortran 08 source file is compiled to a shared-library object file. If not set, then $SHF08COM or $SHFORTRANCOM (the command line) is displayed.

SHF08FLAGS

Options that are passed to the Fortran 08 compiler to generated shared-library objects. You only need to set $SHF08FLAGS if you need to define specific user options for Fortran 08 files. You should normally set the $FORTRANCOMMONFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

SHF08PPCOM

The command line used to compile a Fortran 08 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF08FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $SHF08PPCOM if you need to use a specific C-preprocessor command line for Fortran 08 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

SHF08PPCOMSTR

If set, the string displayed when a Fortran 08 source file is compiled to a shared-library object file after first running the file through the C preprocessor. If not set, then $SHF08PPCOM or $SHFORTRANPPCOM (the command line) is displayed.

SHF77

The Fortran 77 compiler used for generating shared-library objects. You should normally set the $SHFORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF77 if you need to use a specific compiler or compiler version for Fortran 77 files.

SHF77COM

The command line used to compile a Fortran 77 source file to a shared-library object file. You only need to set $SHF77COM if you need to use a specific command line for Fortran 77 files. You should normally set the $SHFORTRANCOM variable, which specifies the default command line for all Fortran versions.

SHF77COMSTR

If set, the string displayed when a Fortran 77 source file is compiled to a shared-library object file. If not set, then $SHF77COM or $SHFORTRANCOM (the command line) is displayed.

SHF77FLAGS

Options that are passed to the Fortran 77 compiler to generated shared-library objects. You only need to set $SHF77FLAGS if you need to define specific user options for Fortran 77 files. You should normally set the $FORTRANCOMMONFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

SHF77PPCOM

The command line used to compile a Fortran 77 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF77FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $SHF77PPCOM if you need to use a specific C-preprocessor command line for Fortran 77 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

SHF77PPCOMSTR

If set, the string displayed when a Fortran 77 source file is compiled to a shared-library object file after first running the file through the C preprocessor. If not set, then $SHF77PPCOM or $SHFORTRANPPCOM (the command line) is displayed.

SHF90

The Fortran 90 compiler used for generating shared-library objects. You should normally set the $SHFORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF90 if you need to use a specific compiler or compiler version for Fortran 90 files.

SHF90COM

The command line used to compile a Fortran 90 source file to a shared-library object file. You only need to set $SHF90COM if you need to use a specific command line for Fortran 90 files. You should normally set the $SHFORTRANCOM variable, which specifies the default command line for all Fortran versions.

SHF90COMSTR

If set, the string displayed when a Fortran 90 source file is compiled to a shared-library object file. If not set, then $SHF90COM or $SHFORTRANCOM (the command line) is displayed.

SHF90FLAGS

Options that are passed to the Fortran 90 compiler to generated shared-library objects. You only need to set $SHF90FLAGS if you need to define specific user options for Fortran 90 files. You should normally set the $FORTRANCOMMONFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

SHF90PPCOM

The command line used to compile a Fortran 90 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF90FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $SHF90PPCOM if you need to use a specific C-preprocessor command line for Fortran 90 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

SHF90PPCOMSTR

If set, the string displayed when a Fortran 90 source file is compiled to a shared-library object file after first running the file through the C preprocessor. If not set, then $SHF90PPCOM or $SHFORTRANPPCOM (the command line) is displayed.

SHF95

The Fortran 95 compiler used for generating shared-library objects. You should normally set the $SHFORTRAN variable, which specifies the default Fortran compiler for all Fortran versions. You only need to set $SHF95 if you need to use a specific compiler or compiler version for Fortran 95 files.

SHF95COM

The command line used to compile a Fortran 95 source file to a shared-library object file. You only need to set $SHF95COM if you need to use a specific command line for Fortran 95 files. You should normally set the $SHFORTRANCOM variable, which specifies the default command line for all Fortran versions.

SHF95COMSTR

If set, the string displayed when a Fortran 95 source file is compiled to a shared-library object file. If not set, then $SHF95COM or $SHFORTRANCOM (the command line) is displayed.

SHF95FLAGS

Options that are passed to the Fortran 95 compiler to generated shared-library objects. You only need to set $SHF95FLAGS if you need to define specific user options for Fortran 95 files. You should normally set the $FORTRANCOMMONFLAGS variable, which specifies the user-specified options passed to the default Fortran compiler for all Fortran versions.

SHF95PPCOM

The command line used to compile a Fortran 95 source file to a shared-library object file after first running the file through the C preprocessor. Any options specified in the $SHF95FLAGS and $CPPFLAGS construction variables are included on this command line. You only need to set $SHF95PPCOM if you need to use a specific C-preprocessor command line for Fortran 95 files. You should normally set the $SHFORTRANPPCOM variable, which specifies the default C-preprocessor command line for all Fortran versions.

SHF95PPCOMSTR

If set, the string displayed when a Fortran 95 source file is compiled to a shared-library object file after first running the file through the C preprocessor. If not set, then $SHF95PPCOM or $SHFORTRANPPCOM (the command line) is displayed.

SHFORTRAN

The default Fortran compiler used for generating shared-library objects.

SHFORTRANCOM

The command line used to compile a Fortran source file to a shared-library object file. By default, any options specified in the $SHFORTRANFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line. See also $FORTRANCOM.

SHFORTRANCOMSTR

If set, the string displayed when a Fortran source file is compiled to a shared-library object file. If not set, then $SHFORTRANCOM (the command line) is displayed.

SHFORTRANFLAGS

Options that are passed to the Fortran compiler to generate shared-library objects.

SHFORTRANPPCOM

The command line used to compile a Fortran source file to a shared-library object file after first running the file through the C preprocessor. By default, any options specified in the $SHFORTRANFLAGS, $CPPFLAGS, $_CPPDEFFLAGS, $_FORTRANMODFLAG, and $_FORTRANINCFLAGS construction variables are included on this command line. See also $SHFORTRANCOM.

SHFORTRANPPCOMSTR

If set, the string displayed when a Fortran source file is compiled to a shared-library object file after first running the file through the C preprocessor. If not set, then $SHFORTRANPPCOM (the command line) is displayed.

SHLIBEMITTER

Contains the emitter specification for the SharedLibrary builder. The manpage section "Builder Objects" contains general information on specifying emitters.

SHLIBNOVERSIONSYMLINKS

Instructs the SharedLibrary builder to not create symlinks for versioned shared libraries.

SHLIBPREFIX

The prefix used for shared library file names.

_SHLIBSONAME

A macro that automatically generates shared library's SONAME based on $TARGET, $SHLIBVERSION and $SHLIBSUFFIX. Used by SharedLibrary builder when the linker tool supports SONAME (e.g. gnulink).

SHLIBSUFFIX

The suffix used for shared library file names.

SHLIBVERSION

When this construction variable is defined, a versioned shared library is created by the SharedLibrary builder. This activates the $_SHLIBVERSIONFLAGS and thus modifies the $SHLINKCOM as required, adds the version number to the library name, and creates the symlinks that are needed. $SHLIBVERSION versions should exist as alpha-numeric, decimal-delimited values as defined by the regular expression "\w+[\.\w+]*". Example $SHLIBVERSION values include '1', '1.2.3', and '1.2.gitaa412c8b'.

_SHLIBVERSIONFLAGS

This macro automatically introduces extra flags to $SHLINKCOM when building versioned SharedLibrary (that is when $SHLIBVERSION is set). _SHLIBVERSIONFLAGS usually adds $SHLIBVERSIONFLAGS and some extra dynamically generated options (such as -Wl,-soname=$_SHLIBSONAME. It is unused by "plain" (unversioned) shared libraries.

SHLIBVERSIONFLAGS

Extra flags added to $SHLINKCOM when building versioned SharedLibrary. These flags are only used when $SHLIBVERSION is set.

SHLINK

The linker for programs that use shared libraries. See also $LINK for linking static objects.

On POSIX systems (those using the link tool), you should normally not change this value as it defaults to a "smart" linker tool which selects a compiler driver matching the type of source files in use. So for example, if you set $SHCXX to a specific compiler name, and are compiling C++ sources, the smartlink function will automatically select the same compiler for linking.

SHLINKCOM

The command line used to link programs using shared libraries. See also $LINKCOM for linking static objects.

SHLINKCOMSTR

The string displayed when programs using shared libraries are linked. If this is not set, then $SHLINKCOM (the command line) is displayed. See also $LINKCOMSTR for linking static objects.

env = Environment(SHLINKCOMSTR = "Linking shared $TARGET")

SHLINKFLAGS

General user options passed to the linker for programs using shared libraries. Note that this variable should not contain -l (or similar) options for linking with the libraries listed in $LIBS, nor -L (or similar) include search path options that scons generates automatically from $LIBPATH. See $_LIBFLAGS above, for the variable that expands to library-link options, and $_LIBDIRFLAGS above, for the variable that expands to library search path options. See also $LINKFLAGS for linking static objects.

SHOBJPREFIX

The prefix used for shared object file names.

SHOBJSUFFIX

The suffix used for shared object file names.

SONAME

Variable used to hard-code SONAME for versioned shared library/loadable module.

env.SharedLibrary('test', 'test.c', SHLIBVERSION='0.1.2', SONAME='libtest.so.2')

The variable is used, for example, by gnulink linker tool.

SOURCE

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

SOURCE_URL

The URL (web address) of the location from which the project was retrieved. This is used to fill in the Source: field in the controlling information for Ipkg and RPM packages.

See the Package builder.

SOURCES

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

SOVERSION

This will construct the SONAME using on the base library name (test in the example below) and use specified SOVERSION to create SONAME.

env.SharedLibrary('test', 'test.c', SHLIBVERSION='0.1.2', SOVERSION='2')

The variable is used, for example, by gnulink linker tool.

In the example above SONAME would be libtest.so.2 which would be a symlink and point to libtest.so.0.1.2

SPAWN

A command interpreter function that will be called to execute command line strings. The function must accept five arguments:

def spawn(shell, escape, cmd, args, env):

shell is a string naming the shell program to use, escape is a function that can be called to escape shell special characters in the command line, cmd is the path to the command to be executed, args holds the arguments to the command and env is a dictionary of environment variables defining the execution environment in which the command should be executed.

STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME

When this variable is true, static objects and shared objects are assumed to be the same; that is, SCons does not check for linking static objects into a shared library.

SUBST_DICT

The dictionary used by the Substfile or Textfile builders for substitution values. It can be anything acceptable to the dict() constructor, so in addition to a dictionary, lists of tuples are also acceptable.

SUBSTFILEPREFIX

The prefix used for Substfile file names, an empty string by default.

SUBSTFILESUFFIX

The suffix used for Substfile file names, an empty string by default.

SUMMARY

A short summary of what the project is about. This is used to fill in the Summary: field in the controlling information for Ipkg and RPM packages, and as the Description: field in MSI packages.

See the Package builder.

SWIG

The name of the SWIG compiler to use.

SWIGCFILESUFFIX

The suffix that will be used for intermediate C source files generated by SWIG. The default value is '_wrap$CFILESUFFIX' - that is, the concatenation of the string _wrap and the current C suffix $CFILESUFFIX. By default, this value is used whenever the -c++ option is not specified as part of the $SWIGFLAGS construction variable.

SWIGCOM

The command line used to call SWIG.

SWIGCOMSTR

The string displayed when calling SWIG. If this is not set, then $SWIGCOM (the command line) is displayed.

SWIGCXXFILESUFFIX

The suffix that will be used for intermediate C++ source files generated by SWIG. The default value is '_wrap$CXXFILESUFFIX' - that is, the concatenation of the string _wrap and the current C++ suffix $CXXFILESUFFIX. By default, this value is used whenever the -c++ option is specified as part of the $SWIGFLAGS construction variable.

SWIGDIRECTORSUFFIX

The suffix that will be used for intermediate C++ header files generated by SWIG. These are only generated for C++ code when the SWIG 'directors' feature is turned on. The default value is _wrap.h.

SWIGFLAGS

General options passed to SWIG. This is where you should set the target language (-python, -perl5, -tcl, etc.) and whatever other options you want to specify to SWIG, such as the -c++ to generate C++ code instead of C Code.

_SWIGINCFLAGS

An automatically-generated construction variable containing the SWIG command-line options for specifying directories to be searched for included files. The value of $_SWIGINCFLAGS is created by respectively prepending and appending $SWIGINCPREFIX and $SWIGINCSUFFIX to the beginning and end of each directory in $SWIGPATH.

SWIGINCPREFIX

The prefix used to specify an include directory on the SWIG command line. This will be prepended to the beginning of each directory in the $SWIGPATH construction variable when the $_SWIGINCFLAGS variable is automatically generated.

SWIGINCSUFFIX

The suffix used to specify an include directory on the SWIG command line. This will be appended to the end of each directory in the $SWIGPATH construction variable when the $_SWIGINCFLAGS variable is automatically generated.

SWIGOUTDIR

Specifies the output directory in which SWIG should place generated language-specific files. This will be used by SCons to identify the files that will be generated by the SWIG call, and translated into the swig -outdir option on the command line.

SWIGPATH

The list of directories that SWIG will search for included files. SCons' SWIG implicit dependency scanner will search these directories for include files. The default value is an empty list.

Don't explicitly put include directory arguments in $SWIGFLAGS the result will be non-portable and the directories will not be searched by the dependency scanner. Note: directory names in $SWIGPATH will be looked-up relative to the SConscript directory when they are used in a command. To force scons to look-up a directory relative to the root of the source tree use a top-relative path (#):

env = Environment(SWIGPATH='#/include')

The directory look-up can also be forced using the Dir() function:

include = Dir('include')
env = Environment(SWIGPATH=include)

The directory list will be added to command lines through the automatically-generated $_SWIGINCFLAGS construction variable, which is constructed by respectively prepending and appending the values of the $SWIGINCPREFIX and $SWIGINCSUFFIX construction variables to the beginning and end of each directory in $SWIGPATH. Any command lines you define that need the SWIGPATH directory list should include $_SWIGINCFLAGS:

env = Environment(SWIGCOM="my_swig -o $TARGET $_SWIGINCFLAGS $SOURCES")

SWIGVERSION

The detected version string of the SWIG tool.

TAR

The tar archiver.

TARCOM

The command line used to call the tar archiver.

TARCOMSTR

The string displayed when archiving files using the tar archiver. If this is not set, then $TARCOM (the command line) is displayed.

env = Environment(TARCOMSTR = "Archiving $TARGET")

TARFLAGS

General options passed to the tar archiver.

TARGET

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

TARGET_ARCH

The name of the hardware architecture that objects created using this construction environment should target. Can be set when creating a construction environment by passing as a keyword argument in the Environment call.

On the win32 platform, if the Microsoft Visual C++ compiler is available, msvc tool setup is done using $HOST_ARCH and $TARGET_ARCH. If a value is not specified, will be set to the same value as $HOST_ARCH. Changing the value after the environment is initialized will not cause the tool to be reinitialized. Compiled objects will be in the target architecture if the compilation system supports generating for that target. The latest compiler which can fulfill the requirement will be selected, unless a different version is directed by the value of the $MSVC_VERSION construction variable.

On the win32/msvc combination, valid target arch values are x86, arm, i386 for 32-bit targets and amd64, arm64, x86_64 and ia64 (Itanium) for 64-bit targets. For example, if you want to compile 64-bit binaries, you would set TARGET_ARCH='x86_64' when creating the construction environment. Note that not all target architectures are supported for all Visual Studio / MSVC versions. Check the relevant Microsoft documentation.

$TARGET_ARCH is not currently used by other compilation tools, but the option is reserved to do so in future

TARGET_OS

The name of the operating system that objects created using this construction environment should target. Can be set when creating a construction environment by passing as a keyword argument in the Environment call;.

$TARGET_OS is not currently used by SCons but the option is reserved to do so in future

TARGETS

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

TARSUFFIX

The suffix used for tar file names.

TEMPFILE

A callable object used to handle overly long command line strings, since operations which call out to a shell will fail if the line is longer than the shell can accept. This tends to particularly impact linking. The tempfile object stores the command line in a temporary file in the appropriate format, and returns an alternate command line so the invoked tool will make use of the contents of the temporary file. If you need to replace the default tempfile object, the callable should take into account the settings of $MAXLINELENGTH, $TEMPFILEPREFIX, $TEMPFILESUFFIX, $TEMPFILEARGJOIN, $TEMPFILEDIR and $TEMPFILEARGESCFUNC.

TEMPFILEARGESCFUNC

The default argument escape function is SCons.Subst.quote_spaces. If you need to apply extra operations on a command argument (to fix Windows slashes, normalize paths, etc.) before writing to the temporary file, you can set the $TEMPFILEARGESCFUNC variable to a custom function. Such a function takes a single string argument and returns a new string with any modifications applied. Example:

import sys
import re
from SCons.Subst import quote_spaces

WINPATHSEP_RE = re.compile(r"\\([^\"'\\]|$)")

def tempfile_arg_esc_func(arg):
    arg = quote_spaces(arg)
    if sys.platform != "win32":
        return arg
    # GCC requires double Windows slashes, let's use UNIX separator
    return WINPATHSEP_RE.sub(r"/\1", arg)

env["TEMPFILEARGESCFUNC"] = tempfile_arg_esc_func

TEMPFILEARGJOIN

The string to use to join the arguments passed to $TEMPFILE when the command line exceeds the limit set by $MAXLINELENGTH. The default value is a space. However for MSVC, MSLINK the default is a line separator as defined by os.linesep. Note this value is used literally and not expanded by the subst logic.

TEMPFILEDIR

The directory to create the long-lines temporary file in.

TEMPFILEPREFIX

The prefix for the name of the temporary file used to store command lines exceeding $MAXLINELENGTH. The default prefix is '@', which works for the Microsoft and GNU toolchains on Windows. Set this appropriately for other toolchains, for example '-@' for the diab compiler or '-via' for ARM toolchain.

TEMPFILESUFFIX

The suffix for the name of the temporary file used to store command lines exceeding $MAXLINELENGTH. The suffix should include the dot ('.') if one is wanted as it will not be added automatically. The default is .lnk.

TEX

The TeX formatter and typesetter.

TEXCOM

The command line used to call the TeX formatter and typesetter.

TEXCOMSTR

The string displayed when calling the TeX formatter and typesetter. If this is not set, then $TEXCOM (the command line) is displayed.

env = Environment(TEXCOMSTR = "Building $TARGET from TeX input $SOURCES")

TEXFLAGS

General options passed to the TeX formatter and typesetter.

TEXINPUTS

List of directories that the LaTeX program will search for include directories. The LaTeX implicit dependency scanner will search these directories for \include and \import files.

TEXTFILEPREFIX

The prefix used for Textfile file names, an empty string by default.

TEXTFILESUFFIX

The suffix used for Textfile file names; .txt by default.

TOOLS

A list of the names of the Tool specifications that are part of this construction environment.

UNCHANGED_SOURCES

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

UNCHANGED_TARGETS

A reserved variable name that may not be set or used in a construction environment. (See the manpage section "Variable Substitution" for more information).

VENDOR

The person or organization who supply the packaged software. This is used to fill in the Vendor: field in the controlling information for RPM packages, and the Manufacturer: field in the controlling information for MSI packages.

See the Package builder.

VERSION

The version of the project, specified as a string.

See the Package builder.

VSWHERE

Specify the location of vswhere.exe.

The vswhere.exe executable is distributed with Microsoft Visual Studio and Build Tools since the 2017 edition, but is also available standalone. It provides full information about installations of 2017 and later editions. With the -legacy argument, vswhere.exe can detect installations of the 2010 through 2015 editions with limited data returned. If VSWHERE is set, SCons will use that location.

Otherwise SCons will look in the following locations and set VSWHERE to the path of the first vswhere.exe located.

%ProgramFiles(x86)%\Microsoft Visual Studio\Installer
%ProgramFiles%\Microsoft Visual Studio\Installer
%ChocolateyInstall%\bin

Note that VSWHERE must be set at the same time or prior to any of msvc, msvs , and/or mslink Tool being initialized. Either set it as follows

env = Environment(VSWHERE='c:/my/path/to/vswhere')

or if your construction environment is created specifying an empty tools list (or a list of tools which omits all of default, msvs, msvc, and mslink), and also before env.Tool is called to ininitialize any of those tools:

    env = Environment(tools=[])
    env['VSWHERE'] = r'c:/my/vswhere/install/location/vswhere.exe'
    env.Tool('msvc')
    env.Tool('mslink')
    env.Tool('msvs')

WINDOWS_EMBED_MANIFEST

Set to True to embed the compiler-generated manifest (normally ${TARGET}.manifest) into all Windows executables and DLLs built with this environment, as a resource during their link step. This is done using $MT and $MTEXECOM and $MTSHLIBCOM. See also $WINDOWS_INSERT_MANIFEST.

WINDOWS_INSERT_DEF

If set to true, a library build of a Windows shared library (.dll file) will include a reference to the corresponding module-definition file at the same time, if a module-definition file is not already listed as a build target. The name of the module-definition file will be constructed from the base name of the library and the construction variables $WINDOWSDEFSUFFIX and $WINDOWSDEFPREFIX. The default is to not add a module-definition file. The module-definition file is not created by this directive, and must be supplied by the developer.

WINDOWS_INSERT_MANIFEST

If set to true, scons will add the manifest file generated by Microsoft Visual C++ 8.0 and later to the target list so SCons will be aware they were generated. In the case of an executable, the manifest file name is constructed using $WINDOWSPROGMANIFESTSUFFIX and $WINDOWSPROGMANIFESTPREFIX. In the case of a shared library, the manifest file name is constructed using $WINDOWSSHLIBMANIFESTSUFFIX and $WINDOWSSHLIBMANIFESTPREFIX. See also $WINDOWS_EMBED_MANIFEST.

WINDOWSDEFPREFIX

The prefix used for a Windows linker module-definition file name. Defaults to empty.

WINDOWSDEFSUFFIX

The suffix used for a Windows linker module-definition file name. Defaults to .def.

WINDOWSEXPPREFIX

The prefix used for Windows linker exports file names. Defaults to empty.

WINDOWSEXPSUFFIX

The suffix used for Windows linker exports file names. Defaults to .exp.

WINDOWSPROGMANIFESTPREFIX

The prefix used for executable program manifest files generated by Microsoft Visual C/C++. Defaults to empty.

WINDOWSPROGMANIFESTSUFFIX

The suffix used for executable program manifest files generated by Microsoft Visual C/C++. Defaults to .manifest.

WINDOWSSHLIBMANIFESTPREFIX

The prefix used for shared library manifest files generated by Microsoft Visual C/C++. Defaults to empty.

WINDOWSSHLIBMANIFESTSUFFIX

The suffix used for shared library manifest files generated by Microsoft Visual C/C++. Defaults to .manifest.

X_IPK_DEPENDS

This is used to fill in the Depends: field in the controlling information for Ipkg packages.

See the Package builder.

X_IPK_DESCRIPTION

This is used to fill in the Description: field in the controlling information for Ipkg packages. The default value is “$SUMMARY\n$DESCRIPTION”

X_IPK_MAINTAINER

This is used to fill in the Maintainer: field in the controlling information for Ipkg packages.

X_IPK_PRIORITY

This is used to fill in the Priority: field in the controlling information for Ipkg packages.

X_IPK_SECTION

This is used to fill in the Section: field in the controlling information for Ipkg packages.

X_MSI_LANGUAGE

This is used to fill in the Language: attribute in the controlling information for MSI packages.

See the Package builder.

X_MSI_LICENSE_TEXT

The text of the software license in RTF format. Carriage return characters will be replaced with the RTF equivalent \\par.

See the Package builder.

X_MSI_UPGRADE_CODE

TODO

X_RPM_AUTOREQPROV

This is used to fill in the AutoReqProv: field in the RPM .spec file.

See the Package builder.

X_RPM_BUILD

internal, but overridable

X_RPM_BUILDREQUIRES

This is used to fill in the BuildRequires: field in the RPM .spec file. Note this should only be used on a host managed by rpm as the dependencies will not be resolvable at build time otherwise.

X_RPM_BUILDROOT

internal, but overridable

X_RPM_CLEAN

internal, but overridable

X_RPM_CONFLICTS

This is used to fill in the Conflicts: field in the RPM .spec file.

X_RPM_DEFATTR

This value is used as the default attributes for the files in the RPM package. The default value is “(-,root,root)”.

X_RPM_DISTRIBUTION

This is used to fill in the Distribution: field in the RPM .spec file.

X_RPM_EPOCH

This is used to fill in the Epoch: field in the RPM .spec file.

X_RPM_EXCLUDEARCH

This is used to fill in the ExcludeArch: field in the RPM .spec file.

X_RPM_EXLUSIVEARCH

This is used to fill in the ExclusiveArch: field in the RPM .spec file.

X_RPM_EXTRADEFS

A list used to supply extra defintions or flags to be added to the RPM .spec file. Each item is added as-is with a carriage return appended. This is useful if some specific RPM feature not otherwise anticipated by SCons needs to be turned on or off. Note if this variable is omitted, SCons will by default supply the value '%global debug_package %{nil}' to disable debug package generation. To enable debug package generation, include this variable set either to None, or to a custom list that does not include the default line. Added in version 3.1.

env.Package(
    NAME="foo",
    ...
    X_RPM_EXTRADEFS=[
        "%define _unpackaged_files_terminate_build 0"
        "%define _missing_doc_files_terminate_build 0"
    ],
    ...
)

X_RPM_GROUP

This is used to fill in the Group: field in the RPM .spec file.

X_RPM_GROUP_lang

This is used to fill in the Group(lang): field in the RPM .spec file. Note that lang is not literal and should be replaced by the appropriate language code.

X_RPM_ICON

This is used to fill in the Icon: field in the RPM .spec file.

X_RPM_INSTALL

internal, but overridable

X_RPM_PACKAGER

This is used to fill in the Packager: field in the RPM .spec file.

X_RPM_POSTINSTALL

This is used to fill in the %post: section in the RPM .spec file.

X_RPM_POSTUNINSTALL

This is used to fill in the %postun: section in the RPM .spec file.

X_RPM_PREFIX

This is used to fill in the Prefix: field in the RPM .spec file.

X_RPM_PREINSTALL

This is used to fill in the %pre: section in the RPM .spec file.

X_RPM_PREP

internal, but overridable

X_RPM_PREUNINSTALL

This is used to fill in the %preun: section in the RPM .spec file.

X_RPM_PROVIDES

This is used to fill in the Provides: field in the RPM .spec file.

X_RPM_REQUIRES

This is used to fill in the Requires: field in the RPM .spec file.

X_RPM_SERIAL

This is used to fill in the Serial: field in the RPM .spec file.

X_RPM_URL

This is used to fill in the Url: field in the RPM .spec file.

XGETTEXT

Path to xgettext(1) program (found via Detect()). See xgettext tool and POTUpdate builder.

XGETTEXTCOM

Complete xgettext command line. See xgettext tool and POTUpdate builder.

XGETTEXTCOMSTR

A string that is shown when xgettext(1) command is invoked (default: '', which means "print $XGETTEXTCOM"). See xgettext tool and POTUpdate builder.

_XGETTEXTDOMAIN

Internal "macro". Generates xgettext domain name form source and target (default: '${TARGET.filebase}').

XGETTEXTFLAGS

Additional flags to xgettext(1). See xgettext tool and POTUpdate builder.

XGETTEXTFROM

Name of file containing list of xgettext(1)'s source files. Autotools' users know this as POTFILES.in so they will in most cases set XGETTEXTFROM="POTFILES.in" here. The $XGETTEXTFROM files have same syntax and semantics as the well known GNU POTFILES.in. See xgettext tool and POTUpdate builder.

_XGETTEXTFROMFLAGS

Internal "macro". Genrates list of -D<dir> flags from the $XGETTEXTPATH list.

XGETTEXTFROMPREFIX

This flag is used to add single $XGETTEXTFROM file to xgettext(1)'s commandline (default: '-f').

XGETTEXTFROMSUFFIX

(default: '')

XGETTEXTPATH

List of directories, there xgettext(1) will look for source files (default: []).

Note

This variable works only together with $XGETTEXTFROM

See also xgettext tool and POTUpdate builder.

_XGETTEXTPATHFLAGS

Internal "macro". Generates list of -f<file> flags from $XGETTEXTFROM.

XGETTEXTPATHPREFIX

This flag is used to add single search path to xgettext(1)'s commandline (default: '-D').

XGETTEXTPATHSUFFIX

(default: '')

YACC

The parser generator.

YACC_GRAPH_FILE

If supplied, write a graph of the automaton to a file with the name taken from this variable. Will be emitted as a --graph= command-line option. Use this in preference to including --graph= in $YACCFLAGS directly.

YACC_HEADER_FILE

If supplied, generate a header file with the name taken from this variable. Will be emitted as a --header= command-line option. Use this in preference to including --header= in $YACCFLAGS directly.

YACCCOM

The command line used to call the parser generator to generate a source file.

YACCCOMSTR

The string displayed when generating a source file using the parser generator. If this is not set, then $YACCCOM (the command line) is displayed.

env = Environment(YACCCOMSTR="Yacc'ing $TARGET from $SOURCES")

YACCFLAGS

General options passed to the parser generator. In addition to passing the value on during invocation, the yacc tool also examines this construction variable for options which cause additional output files to be generated, and adds those to the target list.

If a -d option is present, scons assumes that the call will also create a header file with the suffix defined by $YACCHFILESUFFIX if the yacc source file ends in a .y suffix, or a file with the suffix defined by $YACCHXXFILESUFFIX if the yacc source file ends in a .yy suffix.

If a -g option is present, scons assumes that the call will also create a graph file with the suffix defined by $YACCVCGFILESUFFIX.

If a -v option is present, scons assumes that the call will also create an output debug file with the suffix .output.

Also recognized are GNU bison options --header= and its deprecated synonym --defines=, which is similar to -d but the output filename is named by the option argument; and --graph=, which is similar to -g but the output filename is named by the option argument.

Note that files specified by --header= and --graph= may not be properly handled by SCons in all situations. Consider using $YACC_HEADER_FILE and $YACC_GRAPH_FILE instead.

YACCHFILESUFFIX

The suffix of the C header file generated by the parser generator when the -d option is used. Note that setting this variable does not cause the parser generator to generate a header file with the specified suffix, it exists to allow you to specify what suffix the parser generator will use of its own accord. The default value is .h.

YACCHXXFILESUFFIX

The suffix of the C++ header file generated by the parser generator when the -d option is used. Note that setting this variable does not cause the parser generator to generate a header file with the specified suffix, it exists to allow you to specify what suffix the parser generator will use of its own accord. The default value is .hpp, except on Mac OS X, where the default is ${TARGET.suffix}.h. because the default bison parser generator just appends .h to the name of the generated C++ file.

YACCVCGFILESUFFIX

The suffix of the file containing the VCG grammar automaton definition when the --graph= option is used. Note that setting this variable does not cause the parser generator to generate a VCG file with the specified suffix, it exists to allow you to specify what suffix the parser generator will use of its own accord. The default value is .vcg.

ZIP

The zip compression and file packaging utility.

ZIP_OVERRIDE_TIMESTAMP

An optional timestamp which overrides the last modification time of the file when stored inside the Zip archive. This is a tuple of six values: Year (>= 1980) Month (one-based) Day of month (one-based) Hours (zero-based) Minutes (zero-based) Seconds (zero-based)

ZIPCOM

The command line used to call the zip utility, or the internal Python function used to create a zip archive.

ZIPCOMPRESSION

The compression flag from the Python zipfile module used by the internal Python function to control whether the zip archive is compressed or not. The default value is zipfile.ZIP_DEFLATED, which creates a compressed zip archive. This value has no effect if the zipfile module is unavailable.

ZIPCOMSTR

The string displayed when archiving files using the zip utility. If this is not set, then $ZIPCOM (the command line or internal Python function) is displayed.

env = Environment(ZIPCOMSTR = "Zipping $TARGET")

ZIPFLAGS

General options passed to the zip utility.

ZIPROOT

An optional zip root directory (default empty). The filenames stored in the zip file will be relative to this directory, if given. Otherwise the filenames are relative to the current directory of the command. For instance:

env = Environment()
env.Zip('foo.zip', 'subdir1/subdir2/file1', ZIPROOT='subdir1')

will produce a zip file foo.zip containing a file with the name subdir2/file1 rather than subdir1/subdir2/file1.

ZIPSUFFIX

The suffix used for zip file names.

Configure Contexts

SCons supports a configure context, an integrated mechanism similar to the various AC_CHECK macros in GNU Autoconf for testing the existence of external items needed for the build, such as C header files, libraries, etc. The mechanism is portable across platforms.

scons does not maintain an explicit cache of the tested values (this is different than Autoconf), but uses its normal dependency tracking to keep the checked values up to date. However, users may override this behaviour with the --config command line option.

Configure(env, [custom_tests, conf_dir, log_file, config_h, clean, help])
env.Configure([custom_tests, conf_dir, log_file, config_h, clean, help])

Create a configure context, which tracks information discovered while running tests. The context includes a local construction environment (available as context.env) which is used when running the tests and which can be updated with the check results. Only one context may be active at a time (since 4.0, scons will raise an exception on an attempt to create a new context when there is an active context), but a new context can be created after the active one is completed. For the global function form, the required env describes the initial values for the context's local construction environment; for the construction environment method form the instance provides the values.

custom_tests specifies a dictionary containing custom tests (see the section on custom tests below). The default value is None, meaning no custom tests are added to the configure context.

conf_dir specifies a directory where the test cases are built. This directory is not used for building normal targets. The default value is “#/.sconf_temp”.

log_file specifies a file which collects the output from commands that are executed to check for the existence of header files, libraries, etc. The default is “#/config.log”. If you are using the VariantDir function, you may want to specify a subdirectory under your variant directory.

config_h specifies a C header file where the results of tests will be written. The results will consist of lines like #define HAVE_STDIO_H, #define HAVE_LIBM, etc. Customarily, the name chosen is “config.h”. The default is to not write a config_h file. You can specify the same config_h file in multiple calls to Configure, in which case SCons will concatenate all results in the specified file. Note that SCons uses its normal dependency checking to decide if it's necessary to rebuild the specified config_h file. This means that the file is not necessarily re-built each time scons is run, but is only rebuilt if its contents will have changed and some target that depends on the config_h file is being built.

The clean and help arguments can be used to suppress execution of the configuration tests when the -c/--clean or -H/-h/--help options are used, respectively. The default behavior is always to execute configure context tests, since the results of the tests may affect the list of targets to be cleaned or the help text. If the configure tests do not affect these, then you may add the clean=False or help=False arguments (or both) to avoid unnecessary test execution.

context.Finish()

This method must be called after configuration is done. Though required, this is not enforced except if Configure is called again while there is still an active context, in which case an exception is raised. Finish returns the environment as modified during the course of running the configuration checks. After this method is called, no further checks can be performed with this configuration context. However, you can create a new configure context to perform additional checks.

Example of a typical Configure usage:

env = Environment()
conf = Configure(env)
if not conf.CheckCHeader("math.h"):
    print("We really need math.h!")
    Exit(1)
if conf.CheckLibWithHeader("qt", "qapp.h", "c++", "QApplication qapp(0,0);"):
    # do stuff for qt - usage, e.g.
    conf.env.Append(CPPDEFINES="WITH_QT")
env = conf.Finish()

A configure context has the following predefined methods which can be used to perform checks. Where language is a required or optional parameter, the choice can currently be C or C++. The spellings accepted for C are “C” or “c”; for C++ the value can be “CXX”, “cxx”, “C++” or “c++”.

context.CheckHeader(header, [include_quotes, language]): Checks if header is usable in the specified language. header may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose #include lines should precede the header line being checked for. The optional argument include_quotes must be a two character string, where the first character denotes the opening quote and the second character denotes the closing quote. By default, both characters are " (double quote). The optional argument language should be either C or C++ and selects the compiler to be used for the check. Returns a boolean indicating success or failure.
context.CheckCHeader(header, [include_quotes]): Checks if header is usable when compiling a C language program. header may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose #include lines should precede the header line being checked for. The optional argument include_quotes must be a two character string, where the first character denotes the opening quote and the second character denotes the closing quote. By default, both characters are " (double quote). Note this is a wrapper around CheckHeader. Returns a boolean indicating success or failure.
context.CheckCXXHeader(header, [include_quotes]): Checks if header is usable when compiling a C++ language program. header may be a list, in which case the last item in the list is the header file to be checked, and the previous list items are header files whose #include lines should precede the header line being checked for. The optional argument include_quotes must be a two character string, where the first character denotes the opening quote and the second character denotes the closing quote. By default, both characters are " (double quote). Note this is a wrapper around CheckHeader. Returns a boolean indicating success or failure.
context.CheckFunc(function_name, [header, language])

You can define your own custom checks in addition to using the predefined checks. To enable custom checks, pass a dictionary to the Configure function as the custom_tests parameter. The dictionary maps the names of the checks to the custom check callables (either a Python function or an instance of a class implementing a __call__ method). Each custom check will be called with a a CheckContext instance as the first parameter followed by the remaining arguments, which must be supplied by the user of the check. A CheckContext is not the same as a configure context; rather it is an instance of a class which contains a configure context (available as chk_ctx.sconf). A CheckContext provides the following methods which custom checks can make use of::

chk_ctx.Message(text): Displays text as an indicator of progess. For example: Checking for library X.... Usually called before the check is started.
chk_ctx.Result(res): Displays a result message as an indicator of progress. If res is an integer, displays yes if res evaluates true or no if false. If res is a string, it is displayed as-is. Usually called after the check has completed.
chk_ctx.TryCompile(text, extension=''): Checks if a file containing text and given the specified extension (e.g. '.c') can be compiled to an object file using the environment's Object builder. Returns a boolean indicating success or failure.
chk_ctx.TryLink(text, extension=''): Checks if a file containing text and given the specified extension (e.g. '.c') can be compiled to an executable program using the environment's Program builder. Returns a boolean indicating success or failure.
chk_ctx.TryRun(text, extension=''): Checks if a file containing text and given the specified extension (e.g. '.c') can be compiled to an excutable program using the environment's Program builder and subsequently executed. Execution is only attempted if the build succeeds. If the program executes successfully (that is, its return status is 0), a tuple (True, outputStr) is returned, where outputStr is the standard output of the program. If the program fails execution (its return status is non-zero), then (False, '') is returned.
chk_ctx.TryAction(action, [text, extension='']): Checks if the specified action with an optional source file (contents text, given extension extension) can be executed. action may be anything which can be converted to an Action Object. On success, a tuple (True, outputStr) is returned, where outputStr is the content of the target file. On failure (False, '') is returned.
chk_ctx.TryBuild(builder, [text, extension='']): Low level implementation for testing specific builds; the methods above are based on this method. Given the Builder instance builder and the optional text of a source file with optional extension, returns a boolean indicating success or failure. In addition, chk_ctx.lastTarget is set to the build target node if the build was successful.

Example of implementing and using custom tests:

def CheckQt(chk_ctx, qtdir):
    chk_ctx.Message('Checking for qt ...')
    lastLIBS = chk_ctx.env['LIBS']
    lastLIBPATH = chk_ctx.env['LIBPATH']
    lastCPPPATH = chk_ctx.env['CPPPATH']
    chk_ctx.env.Append(LIBS='qt', LIBPATH=qtdir + '/lib', CPPPATH=qtdir + '/include')
    ret = chk_ctx.TryLink(
        """\
#include <qapp.h>
int main(int argc, char **argv) {
  QApplication qapp(argc, argv);
  return 0;
}
"""
    )
    if not ret:
        chkctx.env.Replace(LIBS=lastLIBS, LIBPATH=lastLIBPATH, CPPPATH=lastCPPPATH)
    chkctx.Result(ret)
    return ret

env = Environment()
conf = Configure(env, custom_tests={'CheckQt': CheckQt})
if not conf.CheckQt('/usr/lib/qt'):
    print('We really need qt!')
    Exit(1)
env = conf.Finish()

Command-Line Construction Variables

Often when building software, some variables need to be specified at build time. For example, libraries needed for the build may be in non-standard locations, or site-specific compiler options may need to be passed to the compiler. SCons provides a Variables object to support overriding construction variables with values obtained from various sources, often from the command line:

scons VARIABLE=foo

The variable values can also be specified in a configuration file or an SConscript file.

To obtain the object for manipulating values, call the Variables function:

Variables([files, [args]])

If files is a file or list of files, they are executed as Python scripts, and the values of (global) Python variables set in those files are added as construction variables in the Default Environment. If no files are specified, or the files argument is None, then no files will be read (supplying None is necessary if there are no files but you want to specify args as a positional argument).

The following example file contents could be used to set an alternative C compiler:

CC = 'my_cc'

If args is specified, it is a dictionary of values that will override anything read from files. The primary use is to pass the ARGUMENTS dictionary that holds variables specified on the command line, allowing you to indicate that if a setting appears on both the command line and in the file(s), the command line setting takes precedence. However, any dictionary can be passed. Examples:

vars = Variables('custom.py')
vars = Variables('overrides.py', ARGUMENTS)
vars = Variables(None, {FOO:'expansion', BAR:7})

Calling Variables with no arguments is equivalent to:

vars = Variables(files=None, args=ARGUMENTS)

Note that since the variables are eventually added as construction variables, you should choose variable names which do not unintentionally change pre-defined construction variables that your project will make use of (see the section called “Construction Variables”).

Variables objects have the following methods:

vars.Add(key, [help, default, validator, converter])

Add a customizable construction variable to the Variables object. key is either the name of the variable, or a tuple (or list), in which case the first item in the tuple is taken as the variable name, and any remaining values are considered aliases for the variable. help is the help text for the variable (default empty string). default is the default value of the variable (default None). If default is None and a value is not specified, the construction variable will not be added to the construction environment.

As a special case, if key is a tuple (or list) and is the only argument, the tuple is unpacked into the five parameters listed above left to right, with any missing members filled with the respecitive default values. This form allows Add to consume a tuple emitted by the convenience functions BoolVariable, EnumVariable, ListVariable, PackageVariable and PathVariable.

If the optional validator is supplied, it is called to validate the value of the variable. A function supplied as a validator must accept three arguments: key, value and env, and should raise an exception with a helpful error message if value is invalid. No return value is expected from the validator.

If the optional converter is supplied, it is called to convert the value before putting it in the environment, and should take either a value or a value and environment as parameters. The converter function must return a value, which will be converted into a string and be passed to the validator (if any) and then added to the construction environment.

Examples:

vars.Add('CC', help='The C compiler')

def valid_color(key, val, env):
    if not val in ['red', 'blue', 'yellow']:
        raise Exception("Invalid color value '%s'" % val)

vars.Add('COLOR', validator=valid_color)

vars.AddVariables(args)

A convenience method that adds one or more customizable construction variables to a Variables object in one call; equivalent to calling Add multiple times. The args are tuples (or lists) that contain the arguments for an individual call to the Add method. Since tuples are not Python mappings, the arguments cannot use the keyword form, but rather are positional arguments as documented for Add: a required name, the other four optional, but must be in the specified order if used.

opt.AddVariables(
    ("debug", "", 0),
    ("CC", "The C compiler"),
    ("VALIDATE", "An option for testing validation", "notset", validator, None),
)

vars.Update(env, [args])

Update a construction environment env with the customized construction variables. Any specified variables that are not configured for the Variables object will be saved and may be retrieved using the UnknownVariables method.

Normally this method is not called directly, but rather invoked indirectly by passing the Variables object to the Environment function:

env = Environment(variables=vars)

vars.UnknownVariables()

Returns a dictionary containing any variables that were specified either in the files or the dictionary with which the Variables object was initialized, but for which the Variables object was not configured.

env = Environment(variables=vars)
for key, value in vars.UnknownVariables():
    print("unknown variable:  %s=%s" % (key, value))

vars.Save(filename, env)

Save the currently set variables into a script file named by filename. Only variables that are set to non-default values are saved. You can load these saved settings on a subsequent run by passing filename to the Variables function, providing a way to cache particular settings for reuse.

env = Environment()
vars = Variables(['variables.cache', 'custom.py'])
vars.Add(...)
vars.Update(env)
vars.Save('variables.cache', env)

vars.GenerateHelpText(env, [sort])

Generate help text documenting the customizable construction variables, suitable for passing in to the Help function. env is the construction environment that will be used to get the actual values of the customizable variables. If the (optional) value of sort is callable, it is used as a comparison function to determine how to sort the added variables. This function must accept two arguments, compare them, and return a negative integer if the first is less-than the second, zero for equality, or a positive integer for greater-than. Optionally a Boolean value of True for sort will cause a standard alphabetical sort to be performed.

Help(vars.GenerateHelpText(env))

def cmp(a, b):
    return (a > b) - (a < b)

Help(vars.GenerateHelpText(env, sort=cmp))

vars.FormatVariableHelpText(env, opt, help, default, actual)

Returns a formatted string containing the printable help text for one option. It is normally not called directly, but is called by the GenerateHelpText method to create the returned help text. It may be overridden with your own function that takes the arguments specified above and returns a string of help text formatted to your liking. Note that GenerateHelpText will not put any blank lines or extra characters in between the entries, so you must add those characters to the returned string if you want the entries separated.

def my_format(env, opt, help, default, actual):
    fmt = "\n%s: default=%s actual=%s (%s)\n"
    return fmt % (opt, default, actual, help)

vars.FormatVariableHelpText = my_format

To make it more convenient to work with customizable Variables, scons provides a number of functions that make it easy to set up various types of Variables. Each of these return a tuple ready to be passed to the Add or AddVariables method:

BoolVariable(key, help, default): Returns a tuple of arguments to set up a Boolean option. The option will use the specified name key, have a default value of default, and help will form the descriptive part of the help text. The option will interpret the values y, yes, t, true, 1, on and all as true, and the values n, no, f, false, 0, off and none as false.
EnumVariable(key, help, default, allowed_values, [map, ignorecase]): Returns a tuple of arguments to set up an option whose value may be one of a specified list of legal enumerated values. The option will use the specified name key, have a default value of default, and help will form the descriptive part of the help text. The option will only support those values in the allowed_values list. The optional map argument is a dictionary that can be used to convert input values into specific legal values in the allowed_values list. If the value of ignore_case is 0 (the default), then the values are case-sensitive. If the value of ignore_case is 1, then values will be matched case-insensitively. If the value of ignore_case is 2, then values will be matched case-insensitively, and all input values will be converted to lower case.
ListVariable(key, help, default, names, [map]): Returns a tuple of arguments to set up an option whose value may be one or more of a specified list of legal enumerated values. The option will use the specified name key, have a default value of default, and help will form the descriptive part of the help text. The option will only accept the values “all”, “none”, or the values in the names list. More than one value may be specified, separated by commas. The default may be a string of comma-separated default values, or a list of the default values. The optional map argument is a dictionary that can be used to convert input values into specific legal values in the names list. (Note that the additional values accepted through the use of a map are not reflected in the generated help message).
PackageVariable(key, help, default): Returns a tuple of arguments to set up an option whose value is a path name of a package that may be enabled, disabled or given an explicit path name. The option will use the specified name key, have a default value of default, and help will form the descriptive part of the help text. The option will support the values yes, true, on, enable or search, in which case the specified default will be used, or the option may be set to an arbitrary string (typically the path name to a package that is being enabled). The option will also support the values no, false, off or disable to disable use of the specified option.
PathVariable(key, help, default, [validator]): Returns a tuple of arguments to set up an option whose value is expected to be a path name. The option will use the specified name key, have a default value of default, and help will form the descriptive part of the help text. An additional validator may be specified that will be called to verify that the specified path is acceptable. SCons supplies the following ready-made validators:

PathVariable.PathExists

Verify that the specified path exists (this the default behavior if no validator is supplied).

PathVariable.PathIsFile

Verify that the specified path exists and is a regular file.

PathVariable.PathIsDir

Verify that the specified path exists and is a directory.

PathVariable.PathIsDirCreate

Verify that the specified path exists and is a directory; if it does not exist, create the directory.

PathVariable.PathAccept

Accept the specific path name argument without validation, suitable for when you want your users to be able to specify a directory path that will be created as part of the build process, for example.

You may supply your own validator function, which must accept three arguments (key, the name of the variable to be set; val, the specified value being checked; and env, the construction environment) and should raise an exception if the specified value is not acceptable.

These functions make it convenient to create a number of variables with consistent behavior in a single call to the AddVariables method:

vars.AddVariables(
    BoolVariable(
        "warnings",
        help="compilation with -Wall and similar",
        default=1,
    ),
    EnumVariable(
        "debug",
        help="debug output and symbols",
        default="no",
        allowed_values=("yes", "no", "full"),
        map={},
        ignorecase=0,  # case sensitive
    ),
    ListVariable(
        "shared",
        help="libraries to build as shared libraries",
        default="all",
        names=list_of_libs,
    ),
    PackageVariable(
        "x11",
        help="use X11 installed here (yes = search some places)",
        default="yes",
    ),
    PathVariable(
        "qtdir",
        help="where the root of Qt is installed",
        default=qtdir),
    PathVariable(
        "foopath",
        help="where the foo library is installed",
        default=foopath,
        validator=PathVariable.PathIsDir,
    ),
)

Node Objects

SCons represents objects that are the sources or targets of build operations as Nodes, which are internal data structures. There are a number of user-visible types of nodes: File Nodes, Directory Nodes, Value Nodes and Alias Nodes. Some of the node types have public attributes and methods, described below. Each of the node types has a global function and a matching environment method to create instances: File, Dir, Value and Alias.

Filesystem Nodes

The File and Dir functions/methods return File and Directory Nodes, respectively. File and Directory Nodes (collectively, Filesystem Nodes) represent build components that correspond to an entry in the computer's filesystem, whether or not such an entry exists at the time the Node is created. You do not usually need to explicitly create filesystem Nodes, since when you supply a string as a target or source of a Builder, SCons will create the Nodes as needed to populate the dependency graph. Builders return the target Node(s) in the form of a list, which you can then make use of. However, since filesystem Nodes have some useful public attributes and methods that you can use in SConscript files, it is sometimes appropriate to create them manually, outside the regular context of a Builder call.

The following attributes provide information about a Node:

node.path: The build path of the given file or directory. This path is relative to the top-level directory (where the SConstruct file is found). The build path is the same as the source path if variant_dir is not being used.
node.abspath: The absolute build path of the given file or directory.
node.relpath: The build path of the given file or directory relative to the root SConstruct file's directory.
node.srcnode(): The srcnode method returns another File or Directory Node representing the source path of the given File or Directory Node.

Examples:

# Get the current build dir's path, relative to top.
Dir('.').path

# Current dir's absolute path
Dir('.').abspath

# Current dir's path relative to the root SConstruct file's directory
Dir('.').relpath

# Next line is always '.', because it is the top dir's path relative to itself.
Dir('#.').path

# Source path of the given source file.
File('foo.c').srcnode().path

# Builders return lists of File objects:
foo = env.Program('foo.c')
print("foo will be built in", foo[0].path)

Filesystem Node objects have methods to create new File and Directory Nodes relative to the original Node. There are also times when you may need to refer to an entry in a filesystem without knowing in advance whether it's a file or a directory. For those situations, there is an Entry method of filesystem node objects, which returns a Node that can represent either a file or a directory.

If the original Node is a Directory Node, these methods will place the new Node within the directory the original Node represents:

node.Dir(name): Returns a directory Node name which is a subdirectory of the directory represented by node.
node.File(name): Returns a file Node name in the directory represented by node.
node.Entry(name): Returns an unresolved Node name in the directory represented by node.

If the original Node is a File Node, these methods will place the the new Node in the same directory as the one the original Node represents:

node.Dir(name): Returns a Node name for a directory in the parent directory of the file represented by node.
node.File(name): Returns a Node name for a file in the parent directory of the file represented by node.
node.Entry(name): Returns an unresolved Node name in the parent directory of the file represented by node.

For example:

# Get a Node for a file within a directory
incl = Dir('include')
f = incl.File('header.h')

# Get a Node for a subdirectory within a directory
dist = Dir('project-3.2.1')
src = dist.Dir('src')

# Get a Node for a file in the same directory
cfile = File('sample.c')
hfile = cfile.File('sample.h')

# Combined example
docs = Dir('docs')
html = docs.Dir('html')
index = html.File('index.html')
css = index.File('app.css')

Value and Alias Nodes

SCons provides two other Node types to represent object that will not have an equivalent filesystem entry. Such Nodes always need to be created explicitly.

The Alias method returns an Alias Node. Aliases are virtual objects - they will not themselves result in physical objects being constructed, but are entered into the dependency graph related to their sources. An alias is checked for up to date by checking if its sources are up to date. An alias is built by making sure its sources have been built, and if any building took place, applying any Actions that are defined as part of the alias.

An Alias call creates an entry in the alias namespace, which is used for disambiguation. If an alias source has a string valued name, it will be resolved to a filesystem entry Node, unless it is found in the alias namespace, in which case it it resolved to the matching alias Node. As a result, the order of Alias calls is significant. An alias can refer to another alias, but only if the other alias has previously been created.

The Value method returns a Value Node. Value nodes are often used for generated data that will not have any corresponding filesystem entry, but will be used to determine whether a build target is out of date, or to include as part of a build Action. Common examples are timestamp strings, revision control version strings and other run-time generated strings.

A Value Node can also be the target of a builder.

EXTENDING SCONS

SCons is designed to be extensible through provided facilities, so changing the code of SCons itself is only rarely needed to customize its behavior. A number of the main operations use callable objects which can be supplemented by writing your own. Builders, Scanners and Tools each use a kind of plugin system, allowing you to easily drop in new ones. Information about creating Builder Objects and Scanner Objects appear in the following sections. The instructions SCons actually uses to construct things are called Actions, and it is easy to create Action Objects and hand them to the objects that need to know about those actions (besides Builders, see AddPostAction, AddPreAction and Alias for some examples of other places that take Actions). Action Objects are also described below. Adding new Tool modules is described in Tool Modules

Builder Objects

scons can be extended to build different types of targets by adding new Builder objects to a construction environment. In general, you should only need to add a new Builder object when you want to build a new type of file or other external target. For output file types scons already knows about, you can usually modify the behavior of premade Builders such as Program, Object or Library by changing the construction variables they use ($CC, $LINK, etc.). In this manner you can, for example, change the compiler to use, which is simpler and less error-prone than writing a new builder. The documentation for each Builder lists which construction variables it uses.

Builder objects are created using the Builder factory function. Once created, a builder is added to an environment by entering it in the $BUILDERS dictionary in that environment (some of the examples in this section illustrate this). Doing so automatically triggers SCons to add a method with the name of the builder to the environment.

The Builder function accepts the following keyword arguments:

action

The command used to build the target from the source. action may be a string representing a template command line to execute, a list of strings representing the command to execute with its arguments (suitable for enclosing white space in an argument), a dictionary mapping source file name suffixes to any combination of command line strings (if the builder should accept multiple source file extensions), a Python function, an Action object (see Action Objects) or a list of any of the above.

An action function must accept three arguments: source, target and env. source is a list of source nodes; target is a list of target nodes; env is the construction environment to use for context.

The action and generator arguments must not both be used for the same Builder.

prefix

The prefix to prepend to the target file name. prefix may be a string, a function (or other callable) that takes two arguments (a construction environment and a list of sources) and returns a prefix string, or a dictionary specifying a mapping from a specific source suffix (of the first source specified) to a corresponding target prefix string. For the dictionary form, both the source suffix (key) and target prefix (value) specifications may use environment variable substitution, and the target prefix may also be a callable object. The default target prefix may be indicated by a dictionary entry with a key of None.

b = Builder("build_it < $SOURCE > $TARGET",
            prefix="file-")

def gen_prefix(env, sources):
    return "file-" + env['PLATFORM'] + '-'

b = Builder("build_it < $SOURCE > $TARGET",
            prefix=gen_prefix)

b = Builder("build_it < $SOURCE > $TARGET",
            suffix={None: "file-", "$SRC_SFX_A": gen_prefix})

suffix

The suffix to append to the target file name. Specified in the same manner as for prefix above. If the suffix is a string, then scons prepends a '.' to the suffix if it's not already there. The string returned by the callable object or obtained from the dictionary is untouched and you need to manually prepend a '.' if one is required.

b = Builder("build_it < $SOURCE > $TARGET"
            suffix="-file")

def gen_suffix(env, sources):
    return "." + env['PLATFORM'] + "-file"

b = Builder("build_it < $SOURCE > $TARGET",
            suffix=gen_suffix)

b = Builder("build_it < $SOURCE > $TARGET",
            suffix={None: ".sfx1", "$SRC_SFX_A": gen_suffix})

ensure_suffix

If set to a true value, ensures that targets will end in suffix. Thus, the suffix will also be added to any target strings that have a suffix that is not already suffix. The default behavior (also indicated by a false value) is to leave unchanged any target string that looks like it already has a suffix.

b1 = Builder("build_it < $SOURCE > $TARGET"
             suffix = ".out")
b2 = Builder("build_it < $SOURCE > $TARGET"
             suffix = ".out",
             ensure_suffix=True)
env = Environment()
env['BUILDERS']['B1'] = b1
env['BUILDERS']['B2'] = b2

# Builds "foo.txt" because ensure_suffix is not set.
env.B1('foo.txt', 'foo.in')

# Builds "bar.txt.out" because ensure_suffix is set.
env.B2('bar.txt', 'bar.in')

src_suffix

The expected source file name suffix. src_suffix may be a string or a list of strings.

target_scanner

A Scanner object that will be invoked to find implicit dependencies for this target file. This keyword argument should be used for Scanner objects that find implicit dependencies based only on the target file and the construction environment, not for implicit dependencies based on source files. See the section called “Scanner Objects” for information about creating Scanner objects.

source_scanner

A Scanner object that will be invoked to find implicit dependencies in any source files used to build this target file. This is where you would specify a scanner to find things like #include lines in source files. The pre-built DirScanner Scanner object may be used to indicate that this Builder should scan directory trees for on-disk changes to files that scons does not know about from other Builder or function calls. See the section called “Scanner Objects” for information about creating your own Scanner objects.

target_factory

A factory function that the Builder will use to turn any targets specified as strings into SCons Nodes. By default, SCons assumes that all targets are files. Other useful target_factory values include Dir, for when a Builder creates a directory target, and Entry, for when a Builder can create either a file or directory target.

Example:

MakeDirectoryBuilder = Builder(action=my_mkdir, target_factory=Dir)
env = Environment()
env.Append(BUILDERS={'MakeDirectory': MakeDirectoryBuilder})
env.MakeDirectory('new_directory', [])

Note that the call to this MakeDirectory Builder needs to specify an empty source list to make the string represent the builder's target; without that, it would assume the argument is the source, and would try to deduce the target name from it, which in the absence of an automatically-added prefix or suffix would lead to a matching target and source name and a circular dependency.

source_factory

A factory function that the Builder will use to turn any sources specified as strings into SCons Nodes. By default, SCons assumes that all source are files. Other useful source_factory values include Dir, for when a Builder uses a directory as a source, and Entry, for when a Builder can use files or directories (or both) as sources.

Example:

CollectBuilder = Builder(action=my_mkdir, source_factory=Entry)
env = Environment()
env.Append(BUILDERS={'Collect': CollectBuilder})
env.Collect('archive', ['directory_name', 'file_name'])

emitter

A function or list of functions to manipulate the target and source lists before dependencies are established and the target(s) are actually built. emitter can also be a string containing a construction variable to expand to an emitter function or list of functions, or a dictionary mapping source file suffixes to emitter functions. (Only the suffix of the first source file is used to select the actual emitter function from an emitter dictionary.)

A function passed as emitter must accept three arguments: source, target and env. source is a list of source nodes, target is a list of target nodes, env is the construction environment to use for context.

An emitter must return a tuple containing two lists, the list of targets to be built by this builder, and the list of sources for this builder.

Example:

def e(target, source, env):
    return target + ['foo.foo'], source + ['foo.src']

# Simple association of an emitter function with a Builder.
b = Builder("my_build < $TARGET > $SOURCE", emitter=e)

def e2(target, source, env):
    return target + ['bar.foo'], source + ['bar.src']

# Simple association of a list of emitter functions with a Builder.
b = Builder("my_build < $TARGET > $SOURCE", emitter=[e, e2])

# Calling an emitter function through a construction variable.
env = Environment(MY_EMITTER=e)
b = Builder("my_build < $TARGET > $SOURCE", emitter='$MY_EMITTER')

# Calling a list of emitter functions through a construction variable.
env = Environment(EMITTER_LIST=[e, e2])
b = Builder("my_build < $TARGET > $SOURCE", emitter='$EMITTER_LIST')

# Associating multiple emitters with different file
# suffixes using a dictionary.
def e_suf1(target, source, env):
    return target + ['another_target_file'], source

def e_suf2(target, source, env):
    return target, source + ['another_source_file']

b = Builder(
    action="my_build < $TARGET > $SOURCE",
    emitter={'.suf1': e_suf1, '.suf2': e_suf2}
)

multi

Specifies whether this builder is allowed to be called multiple times for the same target file(s). The default is False, which means the builder can not be called multiple times for the same target file(s). Calling a builder multiple times for the same target simply adds additional source files to the target; it is not allowed to change the environment associated with the target, specify additional environment overrides, or associate a different builder with the target.

env

A construction environment that can be used to fetch source code using this Builder. (Note that this environment is not used for normal builds of normal target files, which use the environment that was used to call the Builder for the target file.)

generator

A function that returns a list of actions that will be executed to build the target(s) from the source(s). The returned action(s) may be an Action object, or anything that can be converted into an Action object (see the next section).

A function passed as generator must accept four arguments: source, target, env and for_signature. source is a list of source nodes, target is a list of target nodes, env is the construction environment to use for context, and for_signature is a Boolean value that tells the function if it is being called for the purpose of generating a build signature (as opposed to actually executing the command). Since the build signature is used for rebuild determination, the function should omit those elements that do not affect whether a rebuild should be triggered if for_signature is true.

Example:

def g(source, target, env, for_signature):
    return [["gcc", "-c", "-o"] + target + source]

b = Builder(generator=g)

The generator and action arguments must not both be used for the same Builder.

src_builder

Specifies a builder to use when a source file name suffix does not match any of the suffixes of the builder. Using this argument produces a multi-stage builder.

single_source

Specifies that this builder expects exactly one source file per call. Giving more than one source file without target files results in implicitly calling the builder multiple times (once for each source given). Giving multiple source files together with target files results in a UserError exception.

source_ext_match

When the specified action argument is a dictionary, the default behavior when a builder is passed multiple source files is to make sure that the extensions of all the source files match. If it is legal for this builder to be called with a list of source files with different extensions, this check can be suppressed by setting source_ext_match to False or some other non-true value. In this case, scons will use the suffix of the first specified source file to select the appropriate action from the action dictionary.

In the following example, the setting of source_ext_match prevents scons from exiting with an error due to the mismatched suffixes of foo.in and foo.extra.

b = Builder(action={'.in' : 'build $SOURCES > $TARGET'},
            source_ext_match=False)

env = Environment(BUILDERS={'MyBuild':b})
env.MyBuild('foo.out', ['foo.in', 'foo.extra'])

env

b = Builder(action="build < $SOURCE > $TARGET")
env = Environment(BUILDERS={'MyBuild' : b})
env.MyBuild('foo.out', 'foo.in', my_arg='xyzzy')

chdir

A directory from which scons will execute the action(s) specified for this Builder. If the chdir argument is a string or a directory Node, scons will change to the specified directory. If the chdir is not a string or Node and is non-zero, then scons will change to the target file's directory.

Note that scons will not automatically modify its expansion of construction variables like $TARGET and $SOURCE when using the chdir keyword argument--that is, the expanded file names will still be relative to the top-level directory containing the SConstruct file, and consequently incorrect relative to the chdir directory. Builders created using chdir keyword argument, will need to use construction variable expansions like ${TARGET.file} and ${SOURCE.file} to use just the filename portion of the targets and source.

b = Builder(action="build < ${SOURCE.file} > ${TARGET.file}",
            chdir=1)
env = Environment(BUILDERS={'MyBuild' : b})
env.MyBuild('sub/dir/foo.out', 'sub/dir/foo.in')

Warning

Any additional keyword arguments supplied when a Builder object is created (that is, when the Builder function is called) will be set in the executing construction environment when the Builder object is called. The canonical example here would be to set a construction variable to the repository of a source code system.

Any such keyword arguments supplied when a Builder object is called will only be associated with the target created by that particular Builder call (and any other files built as a result of the call). These extra keyword arguments are passed to the following functions: command generator functions, function Actions, and emitter functions.

Action Objects

The Builder factory function will turn its action keyword argument into an appropriate internal Action object, as will the Command function. You can also explicitly create Action objects for passing to Builder, or other functions that take actions as arguments, by calling the Action factory function. This may more efficient when multiple Builder objects need to do the same thing rather than letting each of those Builder objects create a separate Action object. It also allows more flexible configuration of an Action object. For example, to control the message printed when the action is taken you need to create the action object using Action.

The Action factory function returns an appropriate object for the action represented by the type of the action argument (the first positional parameter):

If action is already an Action object, the object is simply returned.
If action is a string, a command-line Action is returned. If such a string begins with @, the command line is not printed. If the string begins with hyphen (-), the exit status from the specified command is ignored, allowing execution to continue even if the command reports failure:
```
Action('$CC -c -o $TARGET $SOURCES')

# Doesn't print the line being executed.
Action('@build $TARGET $SOURCES')

# Ignores return value
Action('-build $TARGET $SOURCES')
```
If action is a list, then a list of Action objects is returned. An Action object is created as necessary for each element in the list. If an element within the list is itself a list, the embedded list is taken as the command and arguments to be executed via the command line. This allows white space to be enclosed in an argument rather than taken as a separator by defining a command in a list within a list:
```
Action([['cc', '-c', '-DWHITE SPACE', '-o', '$TARGET', '$SOURCES']])
```
If action is a callable object, a Function Action is returned. The callable must accept three keyword arguments: target, source and env. target is a Node object representing the target file, source is a Node object representing the source file and env is the construction environment used for building the target file.

The target and source arguments may be lists of Node objects if there is more than one target file or source file. The actual target and source file name(s) may be retrieved from their Node objects via the built-in Python str function:
```
target_file_name = str(target)
source_file_names = [str(x) for x in source]
```
The function should return 0 or None to indicate a successful build of the target file(s). The function may raise an exception or return a non-zero exit status to indicate an unsuccessful build.
```
def build_it(target=None, source=None, env=None):
    # build the target from the source
    return 0

a = Action(build_it)
```
If action is not one of the above types, no action object is generated and Action returns None.

The environment method form env.Action will expand construction variables in any argument strings, including action, at the time it is called, using the construction variables in the construction environment through which it was called. The global function form Action delays variable expansion until the Action object is actually used.

The optional second argument to Action is used to control the output which is printed when the Action is actually performed. If this parameter is omitted, or if the value is an empty string, a default output depending on the type of the action is used. For example, a command-line action will print the executed command. The following argument types are accepted:

If the second argument is a string, or if the cmdstr keyword argument is supplied, the string defines what is printed. Substitution is performed on the string before it is printed. The string typically contains substitutable variables, notably $TARGET(S) and $SOURCE(S), or consists of just a single variable which is optionally defined somewhere else. SCons itself heavily uses the latter variant.
If the second argument is a function, or if the strfunction keyword argument is supplied, the function will be called to obtain the string to be printed when the action is performed. The function must accept three keyword arguments: target, source and env, with the same interpretation as for a callable action argument above. The function is responsible for handling any required substitutions.
If the second argument is None, or if cmdstr=None is supplied, output is suppressed entirely.

The cmdstr and strfunction keyword arguments may not both be supplied in a single call to Action

Printing of action strings is affected by the setting of $PRINT_CMD_LINE_FUNC.

Examples:

def build_it(target, source, env):
    # build the target from the source
    return 0

def string_it(target, source, env):
    return "building '%s' from '%s'" % (target[0], source[0])

# Use a positional argument.
f = Action(build_it, string_it)
s = Action(build_it, "building '$TARGET' from '$SOURCE'")

# Alternatively, use a keyword argument.
f = Action(build_it, strfunction=string_it)
s = Action(build_it, cmdstr="building '$TARGET' from '$SOURCE'")

# You can provide a configurable variable.
l = Action(build_it, '$STRINGIT')

Any additional positional arguments, if present, may either be construction variables or lists of construction variables whose values will be included in the signature of the Action (the build signature) when deciding whether a target should be rebuilt because the action changed. Such variables may also be specified using the varlist keyword parameter; both positional and keyword forms may be present, and will be combined. This is necessary whenever you want a target to be rebuilt when a specific construction variable changes. This is not often needed for a string action, as the expanded variables will normally be part of the command line, but may be needed if a Python function action uses the value of a construction variable when generating the command line.

def build_it(target, source, env):
    # build the target from the 'XXX' construction variable
    with open(target[0], 'w') as f:
        f.write(env['XXX'])
    return 0

# Use positional arguments.
a = Action(build_it, '$STRINGIT', ['XXX'])

# Alternatively, use a keyword argument.
a = Action(build_it, varlist=['XXX'])

The Action factory function can be passed the following optional keyword arguments to modify the Action object's behavior:

chdir

If chdir is true (the default is False), SCons will change directories before executing the action. If the value of chdir is a string or a directory Node, SCons will change to the specified directory. Otherwise, if chdir evaluates true, SCons will change to the target file's directory.

Note that SCons will not automatically modify its expansion of construction variables like $TARGET and $SOURCE when using the chdir parameter - that is, the expanded file names will still be relative to the top-level directory containing the SConstruct file, and consequently incorrect relative to the chdir directory. Builders created using chdir keyword argument, will need to use construction variable expansions like ${TARGET.file} and ${SOURCE.file} to use just the filename portion of the targets and source. Example:

a = Action("build < ${SOURCE.file} > ${TARGET.file}", chdir=True)

exitstatfunc

If provided, must be a callable which accepts a single parameter, the exit status (or return value) from the specified action, and which returns an arbitrary or modified value. This can be used, for example, to specify that an Action object's return value should be ignored under special conditions and SCons should, therefore, consider that the action always succeeds. Example:

def always_succeed(s):
    # Always return 0, which indicates success.
    return 0

a = Action("build < ${SOURCE.file} > ${TARGET.file}",
           exitstatfunc=always_succeed)

batch_key

If provided, indicates that the Action can create multiple target files by processing multiple independent source files simultaneously. (The canonical example is "batch compilation" of multiple object files by passing multiple source files to a single invocation of a compiler such as Microsoft's Visual C / C++ compiler.) If the batch_key argument evaluates True and is not a callable object, the configured Action object will cause scons to collect all targets built with the Action object and configured with the same construction environment into single invocations of the Action object's command line or function. Command lines will typically want to use the $CHANGED_SOURCES construction variable (and possibly $CHANGED_TARGETS as well) to only pass to the command line those sources that have actually changed since their targets were built. Example:

a = Action('build $CHANGED_SOURCES', batch_key=True)

The batch_key argument may also be a callable function that returns a key that will be used to identify different "batches" of target files to be collected for batch building. A batch_key function must accept four parameters: action, env, target and source. The first parameter, action, is the active action object. The second parameter, env, is the construction environment configured for the target. The target and source parameters are the lists of targets and sources for the configured action.

The returned key should typically be a tuple of values derived from the arguments, using any appropriate logic to decide how multiple invocations should be batched. For example, a batch_key function may decide to return the value of a specific construction variable from env which will cause scons to batch-build targets with matching values of that construction variable, or perhaps return the Python id() of the entire construction environment, in which case scons will batch-build all targets configured with the same construction environment. Returning None indicates that the particular target should not be part of any batched build, but instead will be built by a separate invocation of action's command or function. Example:

def batch_key(action, env, target, source):
    tdir = target[0].dir
    if tdir.name == 'special':
        # Don't batch-build any target
        # in the special/ subdirectory.
        return None
    return (id(action), id(env), tdir)
a = Action('build $CHANGED_SOURCES', batch_key=batch_key)

Miscellaneous Action Functions

SCons supplies Action functions that arrange for various common file and directory manipulations to be performed. These are similar in concept to "tasks" in the Ant build tool, although the implementation is slightly different. These functions do not actually perform the specified action at the time the function is called, but rather are factory functions which return an Action object that can be executed at the appropriate time.

There are two natural ways that these Action Functions are intended to be used.

First, if you need to perform the action at the time the SConscript file is being read, you can use the Execute global function:

Execute(Touch('file'))

Second, you can use these functions to supply Actions in a list for use by the env.Command method. This can allow you to perform more complicated sequences of file manipulation without relying on platform-specific external commands:

env = Environment(TMPBUILD='/tmp/builddir')
env.Command(
    target='foo.out',
    source='foo.in',
    action=[
        Mkdir('$TMPBUILD'),
        Copy('$TMPBUILD', '${SOURCE.dir}'),
        "cd $TMPBUILD && make",
        Delete('$TMPBUILD'),
    ],
)

Chmod(dest, mode)

Returns an Action object that changes the permissions on the specified dest file or directory to the specified mode which can be octal or string, similar to the bash command. Examples:

Execute(Chmod('file', 0o755))

env.Command('foo.out', 'foo.in',
            [Copy('$TARGET', '$SOURCE'),
             Chmod('$TARGET', 0o755)])

Execute(Chmod('file', "ugo+w"))

env.Command('foo.out', 'foo.in',
            [Copy('$TARGET', '$SOURCE'),
             Chmod('$TARGET', "ugo+w")])

The behavior of Chmod is limited on Windows, see the notes in the Python documentation for os.chmod, which is the underlying function.

Copy(dest, src)

Returns an Action object that will copy the src source file or directory to the dest destination file or directory. Examples:

Execute(Copy('foo.output', 'foo.input'))

env.Command('bar.out', 'bar.in', Copy('$TARGET', '$SOURCE'))

Delete(entry, [must_exist])

Returns an Action that deletes the specified entry, which may be a file or a directory tree. If a directory is specified, the entire directory tree will be removed. If the must_exist flag is set to a true value, then a Python error will be raised if the specified entry does not exist; the default is false, that is, the Action will silently do nothing if the entry does not exist. Examples:

Execute(Delete('/tmp/buildroot'))

env.Command(
    'foo.out',
    'foo.in',
    action=[
        Delete('${TARGET.dir}'),
        MyBuildAction,
    ],
)

Execute(Delete('file_that_must_exist', must_exist=True))

Mkdir(name)

Returns an Action that creates the directory name and all needed intermediate directories. name may also be a list of directories to create. Examples:

Execute(Mkdir('/tmp/outputdir'))

env.Command(
    'foo.out',
    'foo.in',
    action=[
        Mkdir('/tmp/builddir'),
        Copy('/tmp/builddir/foo.in', '$SOURCE'),
        "cd /tmp/builddir && make",
        Copy('$TARGET', '/tmp/builddir/foo.out'),
    ],
)

Move(dest, src)

Returns an Action that moves the specified src file or directory to the specified dest file or directory. Examples:

Execute(Move('file.destination', 'file.source'))

env.Command(
    'output_file',
    'input_file',
    action=[MyBuildAction, Move('$TARGET', 'file_created_by_MyBuildAction')],
)

Touch(file)

Returns an Action that updates the modification time on the specified file. Examples:

Execute(Touch('file_to_be_touched'))

env.Command('marker', 'input_file', action=[MyBuildAction, Touch('$TARGET')])

Variable Substitution

Before executing a command, scons performs parameter expansion (substitution) on the string that makes up the action part of the builder. The format of a substitutable parameter is ${expression}. If expression refers to a variable, the braces in ${expression} can be omitted unless the variable name is immediately followed by a character that could either be interpreted as part of the name, or is Python syntax such as [ (for indexing/slicing) or . (for attribute access - see Special Attributes below).

If expression refers to a construction variable, it is replaced with the value of that variable in the construction environment at the time of execution. If expression looks like a variable name but is not defined in the construction environment it is replaced with an empty string. If expression refers to one of the Special Variables (see below) the corresponding value of the variable is substituted. expression may also be a Python expression to be evaluated. See Python Code Substitution below for a description.

SCons uses the following rules when converting construction variables into command line strings:

If the value is a string it is interpreted as space delimited command line arguments.
If the value is a list it is interpreted as a list of command line arguments. Each element of the list is converted to a string.
Anything that is not a list or string is converted to a string and interpreted as a single command line argument.
Newline characters (\n) delimit lines. The newline parsing is done after all other parsing, so it is not possible for arguments (e.g. file names) to contain embedded newline characters.
For a literal $ use $$. For example, $$FOO will be left in the final string as $FOO.

When a build action is executed, a hash of the command line is saved, together with other information about the target(s) built by the action, for future use in rebuild determination. This is called the build signature (or build action signature). The escape sequence $( subexpression $) may be used to indicate parts of a command line that may change without causing a rebuild--that is, which are not to be included when calculating the build signature. All text from $( up to and including the matching $) will be removed from the command line before it is added to the build signature while only the $( and $) will be removed before the command is executed. For example, the command line string:

"echo Last build occurred $( $TODAY $). > $TARGET"

would execute the command:

echo Last build occurred $TODAY. > $TARGET

but the build signature added to any target files would be computed from:

echo Last build occurred  . > $TARGET

While construction variables are normally directly substituted, if a construction variable has a value which is a callable Python object (a function, or a class with a __call__ method), that object is called during substitution. The callable must accept four arguments: target, source, env and for_signature. source is a list of source nodes, target is a list of target nodes, env is the construction environment to use for context, and for_signature is a boolean value that tells the callable if it is being called for the purpose of generating a build signature. Since the build signature is used for rebuild determination, variable elements that do not affect whether a rebuild should be triggered should be omitted from the returned string if for_signature is true. See $( and $) above for the syntax.

SCons will insert whatever the callable returns into the expanded string:

def foo(target, source, env, for_signature):
    return "bar"

# Will expand $BAR to "bar baz"
env = Environment(FOO=foo, BAR="$FOO baz")

As a reminder, substitution happens when $BAR is actually used in a builder action. The value of env['BAR'] will be exactly as it was set: "$FOO baz". This can make debugging tricky, as the substituted result is not available at the time the SConscript files are being interpreted and thus not available to print(). However, you can perform the substitution on demand by calling the env.subst method for this purpose.

You can use this feature to pass arguments to a callable variable by creating a callable class that stores passed arguments in the instance, and then uses them (in the __call__ method) when the instance is called. Note that in this case, the entire variable expansion must be enclosed by curly braces so that the arguments will be associated with the instantiation of the class:

class foo:
    def __init__(self, arg):
        self.arg = arg

    def __call__(self, target, source, env, for_signature):
        return self.arg + " bar"

# Will expand $BAR to "my argument bar baz"
env=Environment(FOO=foo, BAR="${FOO('my argument')} baz")

Substitution: Special Variables

Besides regular construction variables, scons provides the following Special Variables for use in expanding commands:

$CHANGED_SOURCES: The file names of all sources of the build command that have changed since the target was last built.
$CHANGED_TARGETS: The file names of all targets that would be built from sources that have changed since the target was last built.
$SOURCE: The file name of the source of the build command, or the file name of the first source if multiple sources are being built.
$SOURCES: The file names of the sources of the build command.
$TARGET: The file name of the target being built, or the file name of the first target if multiple targets are being built.
$TARGETS: The file names of all targets being built.
$UNCHANGED_SOURCES: The file names of all sources of the build command that have not changed since the target was last built.
$UNCHANGED_TARGETS: The file names of all targets that would be built from sources that have not changed since the target was last built.

These names are reserved and may not be assigned to or used as construction variables. SCons computes them in a context-dependent manner and they and are not retrieved from a construction environment.

For example, the following builder call:

env = Environment(CC='cc')
env.Command(
    target=['foo'],
    source=['foo.c', 'bar.c'],
    action='@echo $CC -c -o $TARGET $SOURCES'
)

would produce the following output:

cc -c -o foo foo.c bar.c

In the previous example, a string ${SOURCES[1]} would expand to: bar.c.

Substitution: Special Attributes

A variable name may have the following modifiers appended within the enclosing curly braces to access properties of the interpolated string. These are known as special attributes.

base - The base path of the file name, including the directory path but excluding any suffix.

dir - The name of the directory in which the file exists.

file - The file name, minus any directory portion.

filebase - Like file but minus its suffix.

suffix - Just the file suffix.

abspath - The absolute path name of the file.

relpath - The path name of the file relative to the root SConstruct file's directory.

posix - The path with directories separated by forward slashes (/). Sometimes necessary on Windows systems when a path references a file on other (POSIX) systems.

windows - The path with directories separated by backslashes (\\). Sometimes necessary on POSIX-style systems when a path references a file on other (Windows) systems. win32 is a (deprecated) synonym for windows.

srcpath - The directory and file name to the source file linked to this file through VariantDir(). If this file isn't linked, it just returns the directory and filename unchanged.

srcdir - The directory containing the source file linked to this file through VariantDir(). If this file isn't linked, it just returns the directory part of the filename.

rsrcpath - The directory and file name to the source file linked to this file through VariantDir(). If the file does not exist locally but exists in a Repository, the path in the Repository is returned. If this file isn't linked, it just returns the directory and filename unchanged.

rsrcdir - The Repository directory containing the source file linked to this file through VariantDir(). If this file isn't linked, it just returns the directory part of the filename.

For example, the specified target will expand as follows for the corresponding modifiers:

$TARGET              => sub/dir/file.x
${TARGET.base}       => sub/dir/file
${TARGET.dir}        => sub/dir
${TARGET.file}       => file.x
${TARGET.filebase}   => file
${TARGET.suffix}     => .x
${TARGET.abspath}    => /top/dir/sub/dir/file.x
${TARGET.relpath}    => sub/dir/file.x

$TARGET              => ../dir2/file.x
${TARGET.abspath}    => /top/dir2/file.x
${TARGET.relpath}    => ../dir2/file.x

SConscript('src/SConscript', variant_dir='sub/dir')
$SOURCE              => sub/dir/file.x
${SOURCE.srcpath}    => src/file.x
${SOURCE.srcdir}     => src

Repository('/usr/repository')
$SOURCE              => sub/dir/file.x
${SOURCE.rsrcpath}   => /usr/repository/src/file.x
${SOURCE.rsrcdir}    => /usr/repository/src

Some modifiers can be combined, like ${TARGET.srcpath.base), ${TARGET.file.suffix}, etc.

Python Code Substitution

If a substitutable expression using the notation ${expression} does not appear to match one of the other substitution patterns, it is evaluated as a Python expression. This uses Python's eval function, with the globals parameter set to the current environment's set of construction variables, and the result substituted in. So in the following case:

env.Command(
    'foo.out', 'foo.in', "echo ${COND==1 and 'FOO' or 'BAR'} > $TARGET"
)

the command executed will be either

echo FOO > foo.out

echo BAR > foo.out

according to the current value of env['COND'] when the command is executed. The evaluation takes place when the target is being built, not when the SConscript is being read. So if env['COND'] is changed later in the SConscript, the final value will be used.

Here's a more complete example. Note that all of COND, FOO, and BAR are construction variables, and their values are substituted into the final command. FOO is a list, so its elements are interpolated separated by spaces.

env=Environment()
env['COND'] = 1
env['FOO'] = ['foo1', 'foo2']
env['BAR'] = 'barbar'
env.Command(
    'foo.out', 'foo.in', "echo ${COND==1 and FOO or BAR} > $TARGET"
)

will execute:

echo foo1 foo2 > foo.out

In point of fact, Python expression evaluation is how the special attributes are substituted: they are simply attributes of the Python objects that represent $TARGET, $SOURCES, etc., which SCons passes to eval which returns the value.

Note

Use of the Python eval function is considered to have security implications, since, depending on input sources, arbitrary unchecked strings of code can be executed by the Python interpreter. Although SCons makes use of it in a somewhat restricted context, you should be aware of this issue when using the ${python-expression-for-subst} form.

Scanner Objects

Scanner objects are used to scan specific file types for implicit dependencies, for example embedded preprocessor/compiler directives that cause other files to be included during processing. SCons has a number of pre-built Scanner objects, so it is usually only necessary to set up Scanners for new file types. You do this by calling the Scanner factory function. Scanner accepts the following arguments. Only function is required; the rest are optional:

function

A scanner function to call to process a given Node (usually a file) and return a list of Nodes representing the implicit dependencies (usually files) found in the contents. The function must accept three required arguments, node, env and path, and an optional fourth, arg. node is the internal SCons node representing the file to scan, env is the construction environment to use during the scan, and path is a tuple of directories that can be searched for files, as generated by the optional scanner path_function (see below). If argument was supplied when the Scanner object was created, it is given as arg when the scanner function is called; since argument is optional, the default is no arg.

The function can use use str(node) to fetch the name of the file, node.dir to fetch the directory the file is in, node.get_contents() to fetch the contents of the file as bytes or node.get_text_contents() to fetch the contents of the file as text.

The function must take into account the path directories when generating the dependency Nodes. To illustrate this, a C language source file may contain a line like #include "foo.h". However, there is no guarantee that foo.h exists in the current directory: the contents of $CPPPATH is passed to the C preprocessor which will look in those places for the header, so the scanner function needs to look in those places as well in order to build Nodes with correct paths. Using FindPathDirs with an argument of CPPPATH as the path_function in the Scanner call means the scanner function will be called with the paths extracted from $CPPPATH in the environment env passed as the paths parameter.

Note that the file to scan is not guaranteed to exist at the time the scanner is called - it could be a generated file which has not been generated yet - so the scanner function must be tolerant of that.

Alternatively, you can supply a dictionary as the function parameter, to map keys (such as file suffixes) to other Scanner objects. A Scanner created this way serves as a dispatcher: the Scanner's skeys parameter is automatically populated with the dictionary's keys, indicating that the Scanner handles Nodes which would be selected by those keys; the mapping is then used to pass the file on to a different Scanner that would not have been selected to handle that Node based on its own skeys.

name

The name to use for the Scanner. This is mainly used to identify the Scanner internally. The default value is "NONE".

argument

If specified, will be passed to the scanner function function and the path function path_function when called, as the optional parameter each of those functions takes.

skeys

Scanner key(s) indicating the file types this scanner is associated with. Used internally to select an appropriate scanner. In the usual case of scanning for file names, this argument will be a list of suffixes for the different file types that this Scanner knows how to scan. If skeys is a string, it will be expanded into a list by the current environment.

path_function

A Python function that takes four or five arguments: a construction environment, a Node for the directory containing the SConscript file in which the first target was defined, a list of target nodes, a list of source nodes, and the value of argument if it was supplied when the Scanner was created. Must return a tuple of directories that can be searched for files to be returned by this Scanner object. (Note that the FindPathDirs function can be used to return a ready-made path_function for a given construction variable name, instead of having to write your own function from scratch.)

node_class

The class of Node that should be returned by this Scanner object. Any strings or other objects returned by the scanner function that are not of this class will be run through the function supplied by the node_factory argument. A value of None can be supplied to indicate no conversion; the default is to return File nodes.

node_factory

A Python function that will take a string or other object and turn it into the appropriate class of Node to be returned by this Scanner object, as indicated by node_class.

scan_check

A Python function that takes two arguments, a Node (file) and a construction environment, and returns whether the Node should, in fact, be scanned for dependencies. This check can be used to eliminate unnecessary calls to the scanner function when, for example, the underlying file represented by a Node does not yet exist.

recursive

Specifies whether this scanner should be re-invoked on the dependency files returned by the scanner. If omitted, the Node subsystem will only invoke the scanner on the file being scanned and not recurse. Recursion is needed when the files returned by the scanner may themselves contain further file dependencies, as in the case of preprocessor #include lines. A value that evaluates true enables recursion; recursive may be a callable function, in which case it will be called with a list of Nodes found and should return a list of Nodes that should be scanned recursively; this can be used to select a specific subset of Nodes for additional scanning.

Once created, a Scanner can added to an environment by setting it in the $SCANNERS list, which automatically triggers SCons to also add it to the environment as a method. However, usually a scanner is not truly standalone, but needs to be plugged in to the existing selection mechanism for deciding how to scan source files based on filename extensions. For this, SCons has a global SourceFileScanner object that is used by the Object, SharedObject and StaticObject builders to decide which scanner should be used. You can use the SourceFileScanner.add_scanner() method to add your own Scanner object to the SCons infrastructure that builds target programs or libraries from a list of source files of different types:

def xyz_scan(node, env, path):
    contents = node.get_text_contents()
    # Scan the contents and return the included files.

XYZScanner = Scanner(xyz_scan)

SourceFileScanner.add_scanner('.xyz', XYZScanner)

env.Program('my_prog', ['file1.c', 'file2.f', 'file3.xyz'])

Tool Modules

Additional tools can be added to a project either by placing them in a site_tools subdirectory of a site directory, or in a custom location specified to scons by giving the toolpath keyword argument to Environment. A tool module is a form of Python module, invoked internally using the Python import mechanism, so a tool can consist either of a single source file taking the name of the tool (e.g. mytool.py) or a directory taking the name of the tool (e.g. mytool/) which contains at least an __init__.py file.

The toolpath parameter takes a list as its value:

env = Environment(tools=['default', 'foo'], toolpath=['tools'])

This looks for a tool specification module (mytool.py, or directory mytool) in directory tools and in the standard locations, as well as using the ordinary default tools for the platform.

Directories specified via toolpath are prepended to the existing tool path. The default tool path is any site_tools directories, so tools in a specified toolpath take priority, followed by tools in a site_tools directory, followed by built-in tools. For example, adding a tool specification module gcc.py to the toolpath directory would override the built-in gcc tool. The tool path is stored in the environment and will be used by subsequent calls to the Tool method, as well as by env.Clone.

base = Environment(toolpath=['custom_path'])
derived = base.Clone(tools=['custom_tool'])
derived.CustomBuilder()

A tool specification module must include two functions:

generate(env, **kwargs)

Modify the construction environment env to set up necessary construction variables, Builders, Emitters, etc., so the facilities represented by the tool can be executed. Care should be taken not to overwrite construction variables intended to be settable by the user. For example:

def generate(env):
    ...
    if 'MYTOOL' not in env:
        env['MYTOOL'] = env.Detect("mytool")
    if 'MYTOOLFLAGS' not in env:
        env['MYTOOLFLAGS'] = SCons.Util.CLVar('--myarg')
    ...

The generate function may use any keyword arguments that the user supplies via kwargs to vary its initialization.

exists(env)

Return a true value if the tool can be called in the context of env. else false. Usually this means looking up one or more known programs using the PATH from the supplied env, but the tool can make the exists decision in any way it chooses.

Note

At the moment, user-added tools do not automatically have their exists function called. As a result, it is recommended that the generate function be defensively coded - that is, do not rely on any necessary existence checks already having been performed. This is expected to be a temporary limitation, and the exists function should still be provided.

The elements of the tools list may also be functions or callable objects, in which case the Environment method will call those objects to update the new construction environment (see Tool for more details):

def my_tool(env):
    env['XYZZY'] = 'xyzzy'

env = Environment(tools=[my_tool])

The individual elements of the tools list may also themselves be lists or tuples of the form (toolname, kw_dict). SCons searches for the toolname specification file as described above, and passes kw_dict, which must be a dictionary, as keyword arguments to the tool's generate function. The generate function can use the arguments to modify the tool's behavior by setting up the environment in different ways or otherwise changing its initialization.

# in tools/my_tool.py:
def generate(env, **kwargs):
  # Sets MY_TOOL to the value of keyword 'arg1' '1' if not supplied
  env['MY_TOOL'] = kwargs.get('arg1', '1')

def exists(env):
  return True

# in SConstruct:
env = Environment(tools=['default', ('my_tool', {'arg1': 'abc'})],
                  toolpath=['tools'])

The tool specification (my_tool in the example) can use the $PLATFORM variable from the construction environment it is passed to customize the tool for different platforms.

Tools can be "nested" - that is, they can be located within a subdirectory in the toolpath. A nested tool name uses a dot to represent a directory separator

# namespaced builder
env = Environment(ENV=os.environ.copy(), tools=['SubDir1.SubDir2.SomeTool'])
env.SomeTool(targets, sources)

# Search Paths
# SCons\Tool\SubDir1\SubDir2\SomeTool.py
# SCons\Tool\SubDir1\SubDir2\SomeTool\__init__.py
# .\site_scons\site_tools\SubDir1\SubDir2\SomeTool.py
# .\site_scons\site_tools\SubDir1\SubDir2\SomeTool\__init__.py

SYSTEM-SPECIFIC BEHAVIOR

scons and its configuration files are very portable, due largely to its implementation in Python. There are, however, a few portability issues waiting to trap the unwary.

.C File Suffix

scons handles the upper-case .C file suffix differently, depending on the capabilities of the underlying system. On a case-sensitive system such as Linux or UNIX, scons treats a file with a .C suffix as a C++ source file. On a case-insensitive system such as Windows, scons treats a file with a .C suffix as a C source file.

Fortran File Suffixes

There are several ways source file suffixes impact the behavior of SCons when working with Fortran language code (not all are system-specific, but they are included here for completeness).

While SCons recognizes multiple internal dialects based on filename suffixes, the convention of various available Fortran compilers is to assign an actual meaning to only two of these suffixes: .f (as well as .for and .ftn) refers to the fixed-format source code that was the only available option in FORTRAN 77 and earlier, and .f90 refers to free-format source code which became available as of the Fortran 90 standard. Some compilers recognize suffixes which correspond to Fortran specifications later then F90 as equivalent to .f90 for this purpose, while some do not - check the documentation for your compiler. An occasionally suggested policy suggestion is to use only .f and .f90 as Fortran filename suffixes. The fixed/free form determination can usually be controlled explicitly with compiler flags (e.g. -ffixed-form for gfortran), overriding any assumption that may be made based on the source file suffix.

The source file suffix does not imply conformance with the similarly-named Fortran standard - a suffix of .f08 does not mean you are compiling specifically for Fortran 2008. Normally, compilers provide command-line options for making this selection (e.g. -std=f2008 for gfortran).

For dialects from F90 on (including the generic FORTRAN dialect), a suffix of .mod is recognized for Fortran modules. These files are a side effect of compiling a Fortran source file containing module declarations, and must be available when other code which declares that it uses the module is processed. SCons does not currently have integrated support for submodules, introduced in the Fortran 2008 standard - the invoked compiler will produce results, but SCons will not recognize .smod files as tracked objects.

On a case-sensitive system such as Linux or UNIX, a file with a an upper-cased suffix from the set .F, .FOR, .FTN, .F90, .F95, .F03 and .F08 is treated as a Fortran source file which shall first be run through the standard C preprocessor. The lower-cased versions of these suffixes do not trigger this behavior. On systems which do not distinguish between uppper and lower case in filenames, this behavior is not available, but files suffixed with either .FPP or .fpp are always passed to the preprocessor first. This matches the convention of gfortran from the GNU Compiler Collection, and also followed by certain other Fortran compilers. For these two suffixes, the generic FORTRAN dialect will be selected.

SCons itself does not invoke the preprocessor, that is handled by the compiler, but it adds construction variables which are applicable to the preprocessor run. You can see this difference by examining $FORTRANPPCOM and $FORTRANPPCOMSTR which are used instead of $FORTRANCOM and $FORTRANCOMSTR for that dialect.

Windows: Cygwin Tools and Cygwin Python vs. Windows Pythons

Cygwin supplies a set of tools and utilities that let users work on a Windows system using a POSIX-like environment. The Cygwin tools, including Cygwin Python, do this, in part, by sharing an ability to interpret POSIX-style path names. For example, the Cygwin tools will internally translate a Cygwin path name like /cygdrive/c/mydir to an equivalent Windows pathname of C:/mydir (equivalent to C:\mydir).

Versions of Python that are built for native Windows execution, such as the python.org and ActiveState versions, do not understand the Cygwin path name semantics. This means that using a native Windows version of Python to build compiled programs using Cygwin tools (such as gcc, bison and flex) may yield unpredictable results. "Mixing and matching" in this way can be made to work, but it requires careful attention to the use of path names in your SConscript files.

In practice, users can sidestep the issue by adopting the following guidelines: When using Cygwin's gcc for compiling, use the Cygwin-supplied Python interpreter to run scons; when using Microsoft Visual C/C++ (or some other "native" Windows compiler) use the python.org, Microsoft Store, ActiveState or other native version of Python to run scons.

This discussion largely applies to the msys2 environment as well (with the use of the mingw compiler toolchain), in particular the recommendation to use the msys2 version of Python if running scons from inside an msys2 shell.

Windows: `scons.bat` file

On Windows, if scons is executed via a wrapper scons.bat batch file, there are (at least) two ramifications. Note this is no longer the default - scons installed via Python''s pip installer will have an scons.exe which does not have these limitations:

First, Windows command-line users that want to use variable assignment on the command line may have to put double quotes around the assignments, otherwise the Windows command shell will consume those as arguments to itself, not to scons:

scons "FOO=BAR" "BAZ=BLEH"

Second, the Cygwin shell does not recognize typing scons at the command line prompt as referring to this wrapper. You can work around this either by executing scons.bat (including the extension) from the Cygwin command line, or by creating a wrapper shell script named scons which invokes scons.bat.

MinGW

The MinGW bin directory must be in your PATH environment variable or the ['ENV']['PATH'] construction variable for scons to detect and use the MinGW tools. When running under the native Windows Python; interpreter, scons will prefer the MinGW tools over the Cygwin tools, if they are both installed, regardless of the order of the bin directories in the PATH variable. If you have both MSVC and MinGW installed and you want to use MinGW instead of MSVC, then you must explicitly tell scons to use MinGW by passing tools=['mingw'] to the Environment function, because scons will prefer the MSVC tools over the MinGW tools.

ENVIRONMENT

In general, scons is not controlled by environment variables set in the shell used to invoke it, leaving it up to the SConscript file author to import those if desired. However the following variables are imported by scons itself if set:

SCONS_LIB_DIR: Specifies the directory that contains the scons Python module directory. Normally scons can deduce this, but in some circumstances, such as working with a source release, it may be necessary to specify (for example, /home/aroach/scons-src-0.01/src/engine).

AUTHORS

Originally: Steven Knight <knight@baldmt.com> and Anthony Roach <aroach@electriceyeball.com>.

Since 2010: The SCons Development Team <scons-dev@scons.org>.

SCons 4.4.0

MAN page

The SCons Development Team

Name

Synopsis

DESCRIPTION

Target Selection

OPTIONS

Caution

SCONSCRIPT FILE REFERENCE

SConscript Files

Construction Environments

Tools

Important

Note

Note

Builder Methods

Warning

Note

Note

Note

Note

Note

Methods and Functions To Do Things

Note

SConscript Variables

Construction Variables

Note

Configure Contexts

Command-Line Construction Variables

Node Objects

Filesystem Nodes

Value and Alias Nodes

EXTENDING SCONS

Builder Objects

Warning

Action Objects

Miscellaneous Action Functions

Variable Substitution

Substitution: Special Variables

Substitution: Special Attributes

Python Code Substitution

Note

Scanner Objects

Tool Modules

Note

SYSTEM-SPECIFIC BEHAVIOR

.C File Suffix

Fortran File Suffixes

Windows: Cygwin Tools and Cygwin Python vs. Windows Pythons

Windows: scons.bat file

MinGW

ENVIRONMENT

SEE ALSO

AUTHORS

Windows: `scons.bat` file