Find the OpenSSL encryption library.
This module finds an installed OpenSSL library and determines its version.
Added in version 3.19: When a version is requested, it can be specified as a simple value or as a
range. For a detailed description of version range usage and capabilities,
refer to the find_package()
command.
Added in version 3.18: Support for OpenSSL 3.0.
Added in version 3.12.
This module supports two optional COMPONENTS: Crypto
and SSL
. Both
components have associated imported targets, as described below.
Added in version 3.4.
This module defines the following IMPORTED
targets:
OpenSSL::SSL
The OpenSSL ssl
library, if found.
OpenSSL::Crypto
The OpenSSL crypto
library, if found.
OpenSSL::applink
Added in version 3.18.
The OpenSSL applink
components that might be need to be compiled into
projects under MSVC. This target is available only if found OpenSSL version
is not less than 0.9.8. By linking this target the above OpenSSL targets can
be linked even if the project has different MSVC runtime configurations with
the above OpenSSL targets. This target has no effect on platforms other than
MSVC.
NOTE: Due to how INTERFACE_SOURCES
are consumed by the consuming target,
unless you certainly know what you are doing, it is always preferred to link
OpenSSL::applink
target as PRIVATE
and to make sure that this target is
linked at most once for the whole dependency graph of any library or
executable:
target_link_libraries(myTarget PRIVATE OpenSSL::applink)
Otherwise you would probably encounter unexpected random problems when building and linking, as both the ISO C and the ISO C++ standard claims almost nothing about what a link process should be.
This module will set the following variables in your project:
OPENSSL_FOUND
System has the OpenSSL library. If no components are requested it only requires the crypto library.
OPENSSL_INCLUDE_DIR
The OpenSSL include directory.
OPENSSL_CRYPTO_LIBRARY
The OpenSSL crypto library.
OPENSSL_CRYPTO_LIBRARIES
The OpenSSL crypto library and its dependencies.
OPENSSL_SSL_LIBRARY
The OpenSSL SSL library.
OPENSSL_SSL_LIBRARIES
The OpenSSL SSL library and its dependencies.
OPENSSL_LIBRARIES
All OpenSSL libraries and their dependencies.
OPENSSL_VERSION
This is set to $major.$minor.$revision$patch
(e.g. 0.9.8s
).
OPENSSL_APPLINK_SOURCE
The sources in the target OpenSSL::applink
that is mentioned above. This
variable shall always be undefined if found openssl version is less than
0.9.8 or if platform is not MSVC.
The following variables may be set to control search behavior:
OPENSSL_ROOT_DIR
Set to the root directory of an OpenSSL installation.
OPENSSL_USE_STATIC_LIBS
Added in version 3.4.
Set to TRUE
to look for static libraries.
OPENSSL_MSVC_STATIC_RT
Added in version 3.5.
Set to TRUE
to choose the MT version of the lib.
ENV{PKG_CONFIG_PATH}
On UNIX-like systems, pkg-config
is used to locate the system OpenSSL.
Set the PKG_CONFIG_PATH
environment variable to look in alternate
locations. Useful on multi-lib systems.