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# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
CMAKE_ECLASS=cmake
PYTHON_COMPAT=( python3_{7..9} )
inherit cmake-multilib llvm llvm.org python-any-r1 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"
KEYWORDS=""
IUSE="elibc_glibc elibc_musl +libcxxabi +libunwind static-libs test"
REQUIRED_USE="libunwind? ( libcxxabi )"
RESTRICT="!test? ( test )"
RDEPEND="
libcxxabi? ( ~sys-libs/libcxxabi-${PV}[libunwind=,static-libs?,${MULTILIB_USEDEP}] )
!libcxxabi? ( >=sys-devel/gcc-4.7:=[cxx] )"
# llvm-6 for new lit options
# clang-3.9.0 installs necessary target symlinks unconditionally
# which removes the need for MULTILIB_USEDEP
DEPEND="${RDEPEND}
>=sys-devel/llvm-6"
BDEPEND="
test? (
>=dev-util/cmake-3.16
>=sys-devel/clang-3.9.0
$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
)"
DOCS=( CREDITS.TXT )
LLVM_COMPONENTS=( libcxx{,abi} llvm/{cmake/modules,utils/llvm-lit} )
llvm.org_set_globals
python_check_deps() {
has_version "dev-python/lit[${PYTHON_USEDEP}]"
}
pkg_setup() {
# Darwin Prefix builds do not have llvm installed yet, so rely on
# bootstrap-prefix to set the appropriate path vars to LLVM instead
# of using llvm_pkg_setup.
if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
llvm_pkg_setup
fi
use test && python-any-r1_pkg_setup
if ! use libcxxabi && ! tc-is-gcc ; then
eerror "To build ${PN} against libsupc++, you have to use gcc. Other"
eerror "compilers are not supported. Please set CC=gcc and CXX=g++"
eerror "and try again."
die
fi
}
src_prepare() {
# Add link flag "-Wl,-z,defs" to avoid underlinking; this is needed in a
# out-of-tree build.
eapply "${FILESDIR}/${PN}-3.9-cmake-link-flags.patch"
llvm.org_src_prepare
}
test_compiler() {
$(tc-getCXX) ${CXXFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c++ - \
<<<'int main() { return 0; }' &>/dev/null
}
src_configure() {
# 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=libcxxabi
cxxabi_incs="${EPREFIX}/usr/include/libcxxabi"
else
local gcc_inc="${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() {
# we want -lgcc_s for unwinder, and for compiler runtime when using
# gcc, clang with gcc runtime (or any unknown compiler)
local extra_libs=() want_gcc_s=ON want_compiler_rt=OFF
if use libunwind; then
# work-around missing -lunwind upstream
extra_libs+=( -lunwind )
# if we're using libunwind and clang with compiler-rt, we want
# to link to compiler-rt instead of -lgcc_s
if tc-is-clang; then
local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
${LDFLAGS} -print-libgcc-file-name)
if [[ ${compiler_rt} == *libclang_rt* ]]; then
want_gcc_s=OFF
want_compiler_rt=ON
extra_libs+=( "${compiler_rt}" )
fi
fi
elif [[ ${CHOST} == *-darwin* ]] && tc-is-clang; then
# clang-based darwin prefix disables libunwind useflag during
# bootstrap, because libunwind is not in the prefix yet.
# override the default, though, because clang based libcxx
# should never use gcc_s on Darwin.
want_gcc_s=OFF
# compiler_rt is not available in EPREFIX during bootstrap,
# so we cannot link to it yet anyway, so keep the defaults
# of want_compiler_rt=OFF and extra_libs=()
fi
# bootstrap: cmake is unhappy if compiler can't link to stdlib
local nolib_flags=( -nodefaultlibs -lc )
if ! test_compiler; then
if test_compiler "${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=(
-DLIBCXX_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=$(usex elibc_musl)
-DLIBCXX_HAS_GCC_S_LIB=${want_gcc_s}
-DLIBCXX_INCLUDE_TESTS=$(usex test)
-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
-DCMAKE_SHARED_LINKER_FLAGS="${extra_libs[*]} ${LDFLAGS}"
)
if use test; then
local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
mycmakeargs+=(
-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
-DPython3_EXECUTABLE="${PYTHON}"
)
fi
cmake_src_configure
}
multilib_src_test() {
local -x LIT_PRESERVES_TMP=1
cmake_build check-cxx
}
# Usage: deps
gen_ldscript() {
local output_format
output_format=$($(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 ( $@ )
END_LDSCRIPT
}
gen_static_ldscript() {
local libdir=$(get_libdir)
local cxxabi_lib=$(usex libcxxabi "libc++abi.a" "libsupc++.a")
# Move it first.
mv "${ED}/usr/${libdir}/libc++.a" "${ED}/usr/${libdir}/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 ${cxxabi_lib} $(usex libunwind libunwind.a libgcc_eh.a)"
# On Linux/glibc it does not link without libpthread or libdl. It is
# fine on FreeBSD.
use elibc_glibc && deps+=" libpthread.a libdl.a"
gen_ldscript "${deps}" > "${ED}/usr/${libdir}/libc++.a" || die
}
gen_shared_ldscript() {
local libdir=$(get_libdir)
# libsupc++ doesn't have a shared version
local cxxabi_lib=$(usex libcxxabi "libc++abi.so" "libsupc++.a")
mv "${ED}/usr/${libdir}/libc++.so" "${ED}/usr/${libdir}/libc++_shared.so" || die
local deps="libc++_shared.so ${cxxabi_lib} $(usex libunwind libunwind.so libgcc_s.so)"
gen_ldscript "${deps}" > "${ED}/usr/${libdir}/libc++.so" || die
}
multilib_src_install() {
cmake_src_install
if [[ ${CHOST} != *-darwin* ]] ; then
gen_shared_ldscript
use static-libs && gen_static_ldscript
fi
}
pkg_postinst() {
elog "This package (${PN}) is mainly intended as a replacement for the C++"
elog "standard library when using clang."
elog "To use it, instead of libstdc++, use:"
elog " clang++ -stdlib=libc++"
elog "to compile your C++ programs."
}
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