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216 lines
6.6 KiB
216 lines
6.6 KiB
# Copyright 1999-2018 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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EAPI=6
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# Ninja provides better scalability and cleaner verbose output, and is used
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# throughout all LLVM projects.
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: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
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# (needed due to CMAKE_BUILD_TYPE != Gentoo)
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CMAKE_MIN_VERSION=3.7.0-r1
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PYTHON_COMPAT=( python2_7 )
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inherit cmake-multilib llvm multiprocessing python-any-r1 \
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toolchain-funcs
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DESCRIPTION="New implementation of the C++ standard library, targeting C++11"
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HOMEPAGE="https://libcxx.llvm.org/"
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SRC_URI="https://releases.llvm.org/${PV/_//}/${P/_/}.src.tar.xz"
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LICENSE="|| ( UoI-NCSA MIT )"
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SLOT="0"
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KEYWORDS="amd64 ~arm64 x86"
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IUSE="elibc_glibc elibc_musl +libcxxabi libcxxrt +libunwind +static-libs test"
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REQUIRED_USE="libunwind? ( || ( libcxxabi libcxxrt ) )
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?? ( libcxxabi libcxxrt )"
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RESTRICT="!test? ( test )"
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RDEPEND="
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libcxxabi? ( ~sys-libs/libcxxabi-${PV}[libunwind=,static-libs?,${MULTILIB_USEDEP}] )
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libcxxrt? ( sys-libs/libcxxrt[libunwind=,static-libs?,${MULTILIB_USEDEP}] )
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!libcxxabi? ( !libcxxrt? ( >=sys-devel/gcc-4.7:=[cxx] ) )"
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# llvm-6 for new lit options
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# clang-3.9.0 installs necessary target symlinks unconditionally
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# which removes the need for MULTILIB_USEDEP
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DEPEND="${RDEPEND}
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test? ( >=sys-devel/clang-3.9.0
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$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]') )
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app-arch/xz-utils
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>=sys-devel/llvm-6"
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S=${WORKDIR}/${P/_/}.src
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DOCS=( CREDITS.TXT )
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PATCHES=(
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# Add link flag "-Wl,-z,defs" to avoid underlinking; this is needed in a
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# out-of-tree build.
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"${FILESDIR}/${PN}-3.9-cmake-link-flags.patch"
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)
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# least intrusive of all
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CMAKE_BUILD_TYPE=RelWithDebInfo
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python_check_deps() {
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has_version "dev-python/lit[${PYTHON_USEDEP}]"
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}
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pkg_setup() {
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llvm_pkg_setup
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use test && python-any-r1_pkg_setup
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if ! use libcxxabi && ! use libcxxrt && ! tc-is-gcc ; then
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eerror "To build ${PN} against libsupc++, you have to use gcc. Other"
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eerror "compilers are not supported. Please set CC=gcc and CXX=g++"
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eerror "and try again."
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die
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fi
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if tc-is-gcc && [[ $(gcc-version) < 4.7 ]] ; then
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eerror "${PN} needs to be built with gcc-4.7 or later (or other"
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eerror "conformant compilers). Please use gcc-config to switch to"
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eerror "gcc-4.7 or later version."
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die
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fi
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}
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test_compiler() {
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$(tc-getCXX) ${CXXFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c++ - \
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<<<'int main() { return 0; }' &>/dev/null
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}
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src_configure() {
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# note: we need to do this before multilib kicks in since it will
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# alter the CHOST
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local cxxabi cxxabi_incs
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if use libcxxabi; then
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cxxabi=libcxxabi
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cxxabi_incs="${EPREFIX}/usr/include/libcxxabi"
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elif use libcxxrt; then
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cxxabi=libcxxrt
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cxxabi_incs="${EPREFIX}/usr/include/libcxxrt"
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else
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local gcc_inc="${EPREFIX}/usr/lib/gcc/${CHOST}/$(gcc-fullversion)/include/g++-v$(gcc-major-version)"
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cxxabi=libsupc++
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cxxabi_incs="${gcc_inc};${gcc_inc}/${CHOST}"
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fi
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multilib-minimal_src_configure
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}
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multilib_src_configure() {
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# we want -lgcc_s for unwinder, and for compiler runtime when using
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# gcc, clang with gcc runtime (or any unknown compiler)
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local extra_libs=() want_gcc_s=ON
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if use libunwind; then
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# work-around missing -lunwind upstream
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extra_libs+=( -lunwind )
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# if we're using libunwind and clang with compiler-rt, we want
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# to link to compiler-rt instead of -lgcc_s
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if tc-is-clang; then
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local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
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${LDFLAGS} -print-libgcc-file-name)
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if [[ ${compiler_rt} == *libclang_rt* ]]; then
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want_gcc_s=OFF
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extra_libs+=( "${compiler_rt}" )
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fi
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fi
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fi
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# bootstrap: cmake is unhappy if compiler can't link to stdlib
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local nolib_flags=( -nodefaultlibs -lc )
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if ! test_compiler; then
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if test_compiler "${nolib_flags[@]}"; then
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local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
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ewarn "${CXX} seems to lack runtime, trying with ${nolib_flags[*]}"
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fi
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fi
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local libdir=$(get_libdir)
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local mycmakeargs=(
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-DLIBCXX_LIBDIR_SUFFIX=${libdir#lib}
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-DLIBCXX_ENABLE_SHARED=ON
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-DLIBCXX_ENABLE_STATIC=$(usex static-libs)
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-DLIBCXX_CXX_ABI=${cxxabi}
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-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${cxxabi_incs}
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# we're using our own mechanism for generating linker scripts
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-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
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-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
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-DLIBCXX_HAS_GCC_S_LIB=${want_gcc_s}
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-DLIBCXX_INCLUDE_TESTS=$(usex test)
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-DCMAKE_SHARED_LINKER_FLAGS="${extra_libs[*]} ${LDFLAGS}"
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)
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if use test; then
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local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
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local jobs=${LIT_JOBS:-$(makeopts_jobs "${MAKEOPTS}" "$(get_nproc)")}
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[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
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mycmakeargs+=(
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-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
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-DLLVM_LIT_ARGS="-vv;-j;${jobs};--param=cxx_under_test=${clang_path}"
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)
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fi
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cmake-utils_src_configure
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}
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multilib_src_test() {
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cmake-utils_src_make check-libcxx
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}
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# Usage: deps
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gen_ldscript() {
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local output_format
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output_format=$($(tc-getCC) ${CFLAGS} ${LDFLAGS} -Wl,--verbose 2>&1 | sed -n 's/^OUTPUT_FORMAT("\([^"]*\)",.*/\1/p')
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[[ -n ${output_format} ]] && output_format="OUTPUT_FORMAT ( ${output_format} )"
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cat <<-END_LDSCRIPT
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/* GNU ld script
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Include missing dependencies
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*/
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${output_format}
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GROUP ( $@ )
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END_LDSCRIPT
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}
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gen_static_ldscript() {
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local libdir=$(get_libdir)
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local cxxabi_lib=$(usex libcxxabi "libc++abi.a" "$(usex libcxxrt "libcxxrt.a" "libsupc++.a")")
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# Move it first.
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mv "${ED}/usr/${libdir}/libc++.a" "${ED}/usr/${libdir}/libc++_static.a" || die
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# Generate libc++.a ldscript for inclusion of its dependencies so that
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# clang++ -stdlib=libc++ -static works out of the box.
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local deps="libc++_static.a ${cxxabi_lib} $(usex libunwind libunwind.a libgcc_eh.a)"
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# On Linux/glibc it does not link without libpthread or libdl. It is
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# fine on FreeBSD.
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use elibc_glibc && deps+=" libpthread.a libdl.a"
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gen_ldscript "${deps}" > "${ED}/usr/${libdir}/libc++.a" || die
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}
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gen_shared_ldscript() {
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local libdir=$(get_libdir)
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# libsupc++ doesn't have a shared version
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local cxxabi_lib=$(usex libcxxabi "libc++abi.so" "$(usex libcxxrt "libcxxrt.so" "libsupc++.a")")
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mv "${ED}/usr/${libdir}/libc++.so" "${ED}/usr/${libdir}/libc++_shared.so" || die
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local deps="libc++_shared.so ${cxxabi_lib} $(usex libunwind libunwind.so libgcc_s.so)"
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gen_ldscript "${deps}" > "${ED}/usr/${libdir}/libc++.so" || die
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}
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multilib_src_install() {
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cmake-utils_src_install
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gen_shared_ldscript
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use static-libs && gen_static_ldscript
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}
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pkg_postinst() {
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elog "This package (${PN}) is mainly intended as a replacement for the C++"
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elog "standard library when using clang."
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elog "To use it, instead of libstdc++, use:"
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elog " clang++ -stdlib=libc++"
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elog "to compile your C++ programs."
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}
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