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# Copyright 1999-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
PYTHON_COMPAT=( python3_{10..13} )
inherit cmake-multilib flag-o-matic llvm.org llvm-utils python-any-r1
inherit toolchain-funcs
DESCRIPTION="New implementation of the C++ standard library, targeting C++11"
HOMEPAGE="https://libcxx.llvm.org/"
LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
SLOT="0"
IUSE="+clang +libcxxabi +static-libs test"
REQUIRED_USE="test? ( clang )"
RESTRICT="!test? ( test )"
RDEPEND="
libcxxabi? (
~sys-libs/libcxxabi-${PV}[static-libs?,${MULTILIB_USEDEP}]
)
!libcxxabi? ( >=sys-devel/gcc-4.7:=[cxx] )
"
DEPEND="
${RDEPEND}
sys-devel/llvm:${LLVM_MAJOR}
"
BDEPEND="
clang? (
sys-devel/clang:${LLVM_MAJOR}
)
!test? (
${PYTHON_DEPS}
)
test? (
dev-debug/gdb[python]
$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
)
"
LLVM_COMPONENTS=( runtimes libcxx{,abi} llvm/{cmake,utils/llvm-lit} cmake )
llvm.org_set_globals
python_check_deps() {
use test || return 0
python_has_version "dev-python/lit[${PYTHON_USEDEP}]"
}
pkg_setup() {
python-any-r1_pkg_setup
if ! use libcxxabi && ! tc-is-gcc ; then
eerror "To build ${PN} against libsupc++, you have to use gcc. Other"
eerror "compilers are not supported. Please set CC=gcc and CXX=g++"
eerror "and try again."
die
fi
}
test_compiler() {
$(tc-getCXX) ${CXXFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c++ - \
<<<'int main() { return 0; }' &>/dev/null
}
src_configure() {
llvm_prepend_path "${LLVM_MAJOR}"
# note: we need to do this before multilib kicks in since it will
# alter the CHOST
local cxxabi cxxabi_incs
if use libcxxabi; then
cxxabi=system-libcxxabi
cxxabi_incs="${EPREFIX}/usr/include/c++/v1"
else
local gcc_inc="${EPREFIX}/usr/lib/gcc/${CHOST}/$(gcc-fullversion)/include/g++-v$(gcc-major-version)"
cxxabi=libsupc++
cxxabi_incs="${gcc_inc};${gcc_inc}/${CHOST}"
fi
multilib-minimal_src_configure
}
multilib_src_configure() {
if use clang; then
local -x CC=${CHOST}-clang
local -x CXX=${CHOST}-clang++
strip-unsupported-flags
fi
# link to compiler-rt
local use_compiler_rt=OFF
[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
# bootstrap: cmake is unhappy if compiler can't link to stdlib
local nolib_flags=( -nodefaultlibs -lc )
if ! test_compiler; then
if test_compiler "${nolib_flags[@]}"; then
local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
ewarn "${CXX} seems to lack runtime, trying with ${nolib_flags[*]}"
fi
fi
local libdir=$(get_libdir)
local mycmakeargs=(
-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
-DPython3_EXECUTABLE="${PYTHON}"
-DLLVM_ENABLE_RUNTIMES=libcxx
-DLLVM_INCLUDE_TESTS=OFF
-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
-DLIBCXX_ENABLE_SHARED=ON
-DLIBCXX_ENABLE_STATIC=$(usex static-libs)
-DLIBCXX_CXX_ABI=${cxxabi}
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${cxxabi_incs}
# we're using our own mechanism for generating linker scripts
-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
-DLIBCXX_INCLUDE_BENCHMARKS=OFF
-DLIBCXX_INCLUDE_TESTS=$(usex test)
-DLIBCXX_INSTALL_MODULES=ON
-DLIBCXX_USE_COMPILER_RT=${use_compiler_rt}
# this is broken with standalone builds, and also meaningless
-DLIBCXXABI_USE_LLVM_UNWINDER=OFF
)
if use test; then
mycmakeargs+=(
-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-DLLVM_LIT_ARGS="$(get_lit_flags)"
-DPython3_EXECUTABLE="${PYTHON}"
)
fi
cmake_src_configure
}
multilib_src_compile() {
cmake_src_compile
if [[ ${CHOST} != *-darwin* ]] ; then
gen_shared_ldscript
use static-libs && gen_static_ldscript
fi
}
multilib_src_test() {
local -x LIT_PRESERVES_TMP=1
cmake_build check-cxx
}
multilib_src_install() {
cmake_src_install
# since we've replaced libc++.{a,so} with ldscripts, now we have to
# install the extra symlinks
if [[ ${CHOST} != *-darwin* ]] ; then
dolib.so lib/libc++_shared.so
use static-libs && dolib.a lib/libc++_static.a
fi
}
# Usage: deps
gen_ldscript() {
local output_format
output_format=$($(tc-getCC) ${CFLAGS} ${LDFLAGS} -Wl,--verbose 2>&1 | sed -n 's/^OUTPUT_FORMAT("\([^"]*\)",.*/\1/p')
[[ -n ${output_format} ]] && output_format="OUTPUT_FORMAT ( ${output_format} )"
cat <<-END_LDSCRIPT
/* GNU ld script
Include missing dependencies
*/
${output_format}
GROUP ( $@ )
END_LDSCRIPT
}
gen_static_ldscript() {
# Move it first.
mv lib/libc++{,_static}.a || die
# Generate libc++.a ldscript for inclusion of its dependencies so that
# clang++ -stdlib=libc++ -static works out of the box.
local deps=(
libc++_static.a
$(usex libcxxabi libc++abi.a libsupc++.a)
)
# On Linux/glibc it does not link without libpthread or libdl. It is
# fine on FreeBSD.
use elibc_glibc && deps+=( libpthread.a libdl.a )
gen_ldscript "${deps[*]}" > lib/libc++.a || die
}
gen_shared_ldscript() {
# Move it first.
mv lib/libc++{,_shared}.so || die
local deps=(
libc++_shared.so
# libsupc++ doesn't have a shared version
$(usex libcxxabi libc++abi.so libsupc++.a)
)
gen_ldscript "${deps[*]}" > lib/libc++.so || die
}
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