%global _trivial .0
%global _buildid .1

%global llvm_version_new 21
%global llvm_version_compat 20

Name:       llvm%{llvm_version_new}-bootstrap
Version:    21.1.0
Release:    1%{dist}%{?_trivial}%{?_buildid}
Summary:    The LLVM Compiler Infrastructure, minimal namespaced bootstrap version
License:    Apache-2.0 AND NCSA
URL:        https://llvm.org/
Source0:    https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/llvm-project-%{version}.src.tar.xz
Source1:    https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/llvm-project-%{version}.src.tar.xz.sig

# Amazon Patches
Patch1000:  0001-add-amazon-triplets-as-recognized-clang-toolchain-in.patch

BuildRequires:  cmake
%if 0%{?amzn} == 2023
BuildRequires:  gcc14
BuildRequires:  gcc14-c++
%else
BuildRequires:  gcc
BuildRequires:  gcc-c++
%endif
BuildRequires:  ninja-build
BuildRequires:  zlib-devel
BuildRequires:  libxml2-devel
BuildRequires:  python3-devel
BuildRequires:  openssl-devel
BuildRequires:  gmp-devel
BuildRequires:  libtool
BuildRequires:  binutils-devel
BuildRequires:  clang%{llvm_version_compat}
BuildRequires:  lld%{llvm_version_compat}
BuildRequires:  llvm%{llvm_version_compat}
BuildRequires:  compiler-rt%{llvm_version_compat}
%global toolchain clang

Requires:       zlib
Requires:       libxml2
%if 0%{?amzn} == 2023
Requires:       gcc14 gcc14-c++
%else
Requires:       gcc gcc-c++
%endif

# Disable all debug package generation as this is a minimal bootstrap package.
%global debug_package %{nil}
%define debuginfo %{nil}
%define __strip %{nil}
# Allow installed but not packaged files, which is useful for a bootstrap build.
%define _unpackaged_files_terminate_build 0

%define __brp_llvm_compile_lto_elf %{nil}

%description
This package contains a minimal bootstrap build of the LLVM 19 compiler
infrastructure. It is intentionally small, providing just the necessary
components to build a more complete, intermediate bootstrap package.

%prep
%autosetup -p1 -n llvm-project-%{version}.src


%build
export CFLAGS="$(echo %{optflags} | sed -e 's|fno-openmp-implicit-rpath||g')"
export CXXFLAGS="$(echo %{optflags} | sed -e 's|fno-openmp-implicit-rpath||g')"
export LDFLAGS="$(echo %{optflags} | sed -e 's|fno-openmp-implicit-rpath||g')"
export CC=clang-%{llvm_version_compat}
export CXX=clang++-%{llvm_version_compat}
export LD=lld-%{llvm_version_compat}
export PATH="%{_libdir}/llvm-%{llvm_version_compat}/bin:$PATH"
%cmake -S llvm -G Ninja \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_C_FLAGS="${CFLAGS}" \
  -DCMAKE_CXX_FLAGS="${CXXFLAGS}" \
  -DCMAKE_INSTALL_PREFIX=%{_libdir}/llvm-%{llvm_version_new} \
  -DLLVM_ENABLE_PROJECTS="clang;lld" \
  -DLLVM_BUILD_TESTS=OFF \
  -DLLVM_BUILD_DOCS=OFF \
  -DLLVM_TOOL_LLD_BUILD=ON \
  -DLLVM_TOOL_CLANG_BUILD=ON \
  -DCMAKE_C_COMPILER=%{_libdir}/llvm%{llvm_version_compat}/bin/clang \
  -DCMAKE_CXX_COMPILER=%{_libdir}/llvm%{llvm_version_compat}/bin/clang++ \
  -DCLANG_DEFAULT_C_STDLIB=glibc \
  -DCLANG_DEFAULT_CXX_STDLIB=libstdc++ \
  -DLLVM_LINK_LLVM_DYLIB=ON \
  -DBUILD_SHARED_LIBS=OFF \
  -DLLVM_ENABLE_LTO=OFF \
  -DLLVM_TOOL_LLVM_GOLD_BUILD=OFF \
  -DCMAKE_C_COMPILER_TARGET="%{_arch}-amazon-linux" \
  -DCMAKE_CXX_COMPILER_TARGET="%{_arch}-amazon-linux" \
  -DCLANG_DEFAULT_C_STDLIB=glibc \
  -DCLANG_DEFAULT_CXX_STDLIB=libstdc++ \
  -DCLANG_DEFAULT_LINKER=lld-%{llvm_version_new}

%cmake_build

%install
export PATH="%{_libdir}/llvm-%{llvm_version_new}/bin:$PATH"
# Perform the install using the new versioned prefix.
%cmake_install

# Fix ambiguous python and perl shebangs.
find %{buildroot}%{_libdir}/llvm-%{llvm_version_new} -type f -exec sed -i -e '1s|#!/usr/bin/env python$|#!/usr/bin/python3|' \
  -e '1s|#!/usr/bin/env python3$|#!/usr/bin/python3|' \
  -e '1s|#!/usr/bin/env perl$|#!/usr/bin/perl|' {} +

# Create symlinks to the core tools in %{_bindir}
# Use absolute paths to prevent broken links on 64-bit systems.
install -d %{buildroot}%{_bindir}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/clang %{buildroot}%{_bindir}/clang-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/clang %{buildroot}%{_bindir}/clang++-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/lld %{buildroot}%{_bindir}/lld-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/lld %{buildroot}%{_bindir}/ld.lld-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/llvm-ar %{buildroot}%{_bindir}/llvm-ar-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/llvm-nm %{buildroot}%{_bindir}/llvm-nm-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/llvm-objdump %{buildroot}%{_bindir}/llvm-objdump-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/llvm-readelf %{buildroot}%{_bindir}/llvm-readelf-%{llvm_version_new}
ln -sf %{_libdir}/llvm-%{llvm_version_new}/bin/llvm-strip %{buildroot}%{_bindir}/llvm-strip-%{llvm_version_new}

# Copy the license file to the correct location
install -d %{buildroot}%{_defaultlicensedir}/%{name}
install -m 644 LICENSE.TXT %{buildroot}%{_defaultlicensedir}/%{name}/LICENSE.TXT

%files
%license %{_defaultlicensedir}/%{name}/LICENSE.TXT
%{_bindir}/*-%{llvm_version_new}
%dir %{_libdir}/llvm-%{llvm_version_new}/
%{_libdir}/llvm-%{llvm_version_new}/bin/*
%{_libdir}/llvm-%{llvm_version_new}/lib/*
%{_libdir}/llvm-%{llvm_version_new}/libexec/*
%{_libdir}/llvm-%{llvm_version_new}/include/*
%{_libdir}/llvm-%{llvm_version_new}/share/*
%{_libdir}/llvm-%{llvm_version_new}/lib/cmake/*

%changelog