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242 lines
7.0 KiB
Bash
242 lines
7.0 KiB
Bash
# Copyright 2025 Gentoo Authors
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# Distributed under the terms of the GNU General Public License v2
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EAPI=8
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inherit cmake prefix python-utils-r1
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DESCRIPTION="Clang fork implementing experimental support for P2996 (Reflection for C++26)"
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HOMEPAGE="https://github.com/bloomberg/clang-p2996"
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LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA BSD MIT public-domain rc"
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SLOT="0"
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if [[ ${PV} == 9999 ]]; then
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inherit git-r3
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EGIT_REPO_URI="https://github.com/bloomberg/clang-p2996.git"
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EGIT_BRANCH="p2996"
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else
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GIT_COMMIT="2ea0a79fe7bb5f6fdb8c687ba0e21ab63696e7f7"
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SRC_URI="https://github.com/bloomberg/clang-p2996/archive/${GIT_COMMIT}.tar.gz -> ${P}.tar.gz"
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S="${WORKDIR}/clang-p2996-${GIT_COMMIT}"
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KEYWORDS="~amd64"
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fi
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ALL_LLVM_TARGETS="AArch64 AMDGPU ARC ARM AVR BPF CSKY DirectX Hexagon Lanai LoongArch M68k MSP430 Mips NVPTX PowerPC RISCV SPIRV Sparc SystemZ VE WebAssembly +X86 XCore Xtensa"
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IUSE="+debug +default-reflection-latest +pie"
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for target in ${ALL_LLVM_TARGETS}; do
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IUSE+=" ${target%${target#+}}llvm_targets_${target#+}"
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done
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# TODO
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RDEPEND="virtual/zlib:="
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DEPEND="${RDEPEND}"
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PATCHES=(
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"${FILESDIR}/21.0.0_p20250702-unknown-reflection.patch"
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"${FILESDIR}/21.0.0_p20250702-uninitialized.patch"
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)
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CMAKE_USE_DIR="$S/llvm"
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src_prepare() {
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# create extra parent dir for relative CLANG_RESOURCE_DIR access
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mkdir -p x/y || die
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BUILD_DIR=${WORKDIR}/x/y/clang
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use default-reflection-latest && eapply "${FILESDIR}/21.0.0_p20250702-enable-reflection-latest.patch"
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cmake_src_prepare
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# add Gentoo Portage Prefix for Darwin (see prefix-dirs.patch)
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eprefixify \
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clang/lib/Lex/InitHeaderSearch.cpp \
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clang/lib/Driver/ToolChains/Darwin.cpp || die
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if ! use prefix-guest && [[ -n ${EPREFIX} ]]; then
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sed -i "/LibDir.*Loader/s@return \"\/\"@return \"${EPREFIX}/\"@" clang/lib/Driver/ToolChains/Linux.cpp || die
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fi
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}
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src_configure() {
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local targets=()
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for target in ${ALL_LLVM_TARGETS}; do
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use llvm_targets_${target#+} && targets+=("${target#+}")
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done
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if [ ${#targets[@]} -eq 0 ]; then
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die "At least one LLVM target must be enabled"
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fi
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local libdir=$(get_libdir)
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local mycmakeargs=(
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-DDEFAULT_SYSROOT=$(usex prefix-guest "" "${EPREFIX}")
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-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
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-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/lib/llvm/bloomberg-p2996"
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-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
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-DBUILD_SHARED_LIBS=OFF
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-DLLVM_HOST_TRIPLE="${CHOST}"
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-DLLVM_BUILD_LLVM_DYLIB=ON
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-DLLVM_LINK_LLVM_DYLIB=ON
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-DLLVM_ENABLE_PROJECTS="clang"
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-DLLVM_ENABLE_RUNTIMES="libcxxabi;libcxx"
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-DLLVM_TARGETS_TO_BUILD="$(IFS=';'; echo "${targets[*]}")"
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-DLLVM_INCLUDE_BENCHMARKS=OFF
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-DLLVM_INCLUDE_TESTS=OFF
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-DLLVM_BUILD_TESTS=OFF
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-DLLVM_INSTALL_GTEST=OFF
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-DLLVM_ENABLE_ASSERTIONS=$(usex debug)
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-DLLVM_ENABLE_EH=ON
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-DLLVM_ENABLE_RTTI=ON
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-DLLVM_ENABLE_ZLIB=FORCE_ON
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-DLIBCXX_ENABLE_SHARED=ON
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-DLIBCXX_ENABLE_STATIC=OFF
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-DLIBCXX_CXX_ABI=libcxxabi
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-DLIBCXX_USE_COMPILER_RT=OFF
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-DLIBCXX_HAS_GCC_S_LIB=OFF
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-DLIBCXX_INCLUDE_BENCHMARKS=OFF
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-DLIBCXX_INCLUDE_TESTS=OFF
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-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
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-DLIBCXXABI_USE_LLVM_UNWINDER=OFF
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-DCLANG_CONFIG_FILE_SYSTEM_DIR="${EPREFIX}/etc/clang/bloomberg-p2996"
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-DCLANG_CONFIG_FILE_USER_DIR="~/.config/clang"
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# relative to bindir
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-DCLANG_RESOURCE_DIR="../../../../lib/clang/bloomberg-p2996"
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-DCLANG_LINK_CLANG_DYLIB=ON
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-DCLANG_INCLUDE_TESTS=OFF
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-DCLANG_DEFAULT_OPENMP_RUNTIME=libomp
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-DCLANG_DEFAULT_PIE_ON_LINUX=$(usex pie)
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-DPython3_EXECUTABLE="${PYTHON}"
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-DOCAMLFIND=NO
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)
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use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
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cmake_src_configure
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}
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src_compile() {
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cmake_src_compile
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}
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_doclang_cfg() {
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local triple="${1}"
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local tool
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for tool in clang{,++,-cpp}; do
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newins - "${triple}-${tool}.cfg" <<-EOF
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# This configuration file is used by ${triple}-${tool} driver.
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@../${triple}-${tool}.cfg
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@gentoo-plugins.cfg
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@gentoo-runtimes.cfg
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EOF
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if [[ ! -f "${ED}/etc/clang/bloomberg-p2996/bloomberg-p2996-${tool}.cfg" ]]; then
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dosym "${triple}-${tool}.cfg" "/etc/clang/bloomberg-p2996/bloomberg-p2996-${tool}.cfg"
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fi
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done
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# Install symlinks for triples with other vendor strings since some
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# programs insist on mangling the triple.
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local vendor
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for vendor in gentoo pc unknown; do
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local vendor_triple="${triple%%-*}-${vendor}-${triple#*-*-}"
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for tool in clang{,++,-cpp}; do
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if [[ ! -f "${ED}/etc/clang/bloomberg-p2996/${vendor_triple}-${tool}.cfg" ]]; then
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dosym "${triple}-${tool}.cfg" "/etc/clang/bloomberg-p2996/${vendor_triple}-${tool}.cfg"
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fi
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done
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done
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}
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doclang_cfg() {
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#local triple=$(get_abi_CHOST "${abi}")
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local triple=${CHOST}
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_doclang_cfg ${triple}
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# LLVM may have different arch names in some cases. For example in x86
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# profiles the triple uses i686, but llvm will prefer i386 if invoked
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# with "clang" on x86 or "clang -m32" on x86_64. The gentoo triple will
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# be used if invoked through ${CHOST}-clang{,++,-cpp} though.
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#
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# To make sure the correct triples are installed,
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# see Triple::getArchTypeName() in llvm/lib/TargetParser/Triple.cpp
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# and compare with CHOST values in profiles.
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local abi=${triple%%-*}
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case ${abi} in
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armv4l|armv4t|armv5tel|armv6j|armv7a)
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_doclang_cfg ${triple/${abi}/arm}
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;;
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i686)
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_doclang_cfg ${triple/${abi}/i386}
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;;
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sparc)
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_doclang_cfg ${triple/${abi}/sparcel}
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;;
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sparc64)
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_doclang_cfg ${triple/${abi}/sparcv9}
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;;
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esac
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}
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src_install() {
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cmake_src_install
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# Rename programs and update symlinks
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cd "${D}/usr/lib/llvm/bloomberg-p2996/bin" || die
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for file in *; do
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if [[ -f "${file}" && -x "${file}" && ! -L "${file}" ]]; then
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# Rename regular, executable files
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mv "${file}" "bloomberg-p2996-${file}" || die "Failed to rename ${file}"
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elif [[ -L "${file}" ]]; then
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# Update symlink to point to renamed target
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local target
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target=$(readlink "${file}") || die "Failed to read symlink ${file}"
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ln -sf "bloomberg-p2996-${target}" "bloomberg-p2996-${file}" || die "Failed to update symlink ${file}"
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rm "${file}" || die "Failed to remove original symlink ${file}"
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fi
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done
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local ldpath="${EPREFIX}/usr/lib/llvm/bloomberg-p2996/$(get_libdir)"
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newenvd - "60llvm-bloomberg-p2996" <<-_EOF_
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PATH="${EPREFIX}/usr/lib/llvm/bloomberg-p2996/bin"
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# we need to duplicate it in ROOTPATH for Portage to respect...
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ROOTPATH="${EPREFIX}/usr/lib/llvm/bloomberg-p2996/bin"
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LDPATH="${ldpath}:${ldpath}/${CHOST}"
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_EOF_
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insinto "/etc/clang/bloomberg-p2996"
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newins - gentoo-runtimes.cfg <<-EOF
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# This file is initially generated by sys-devel/clang-bloomberg-p2996::guru.
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# It is used to control the default runtimes using by clang.
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--rtlib=libgcc
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--unwindlib=libgcc
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--stdlib=libc++
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-fuse-ld=bfd
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-L${ldpath}/${CHOST}
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EOF
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newins - gentoo-plugins.cfg <<-EOF
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# This file is used to load optional LLVM plugins.
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EOF
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doclang_cfg
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rm -r "${D}/usr/share/man" || die
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}
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pkg_postinst() {
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elog "Binaries are installed with a 'bloomberg-p2996-' prefix,"
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elog "e.g.: bloomberg-p2996-clang++"
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use default-reflection-latest && \
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elog "Pass -fno-reflection-latest to disable reflection support." || \
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elog "Pass -freflection-latest to enable reflection support."
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}
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