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# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

EAPI=6

# Ninja provides better scalability and cleaner verbose output, and is used
# throughout all LLVM projects.
: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
EGIT_REPO_URI="http://llvm.org/git/libcxx.git
	https://github.com/llvm-mirror/libcxx.git"
PYTHON_COMPAT=( python2_7 )

[[ ${PV} == 9999 ]] && SCM="git-r3" || SCM=""

inherit ${SCM} cmake-multilib python-any-r1 toolchain-funcs flag-o-matic

DESCRIPTION="New implementation of the C++ standard library, targeting C++11"
HOMEPAGE="http://libcxx.llvm.org/"
if [[ ${PV} != 9999 ]] ; then
	SRC_URI="http://llvm.org/releases/${PV}/${P}.src.tar.xz"
	S="${WORKDIR}/${P}.src"
else
	SRC_URI=""
fi

LICENSE="|| ( UoI-NCSA MIT )"
SLOT="0"
if [[ ${PV} != 9999 ]] ; then
	KEYWORDS="~x64-macos ~x86-macos"
else
	KEYWORDS=""
fi
IUSE="elibc_Darwin elibc_glibc elibc_musl +libcxxabi libcxxrt libunwind +static-libs test"
REQUIRED_USE="libunwind? ( || ( libcxxabi libcxxrt ) )
	elibc_Darwin? ( libcxxabi )
	?? ( libcxxabi libcxxrt )"

RDEPEND="
	libcxxabi? ( ~sys-libs/libcxxabi-${PV}[libunwind=,static-libs?,${MULTILIB_USEDEP}] )
	!elibc_Darwin? (
		libcxxrt? ( sys-libs/libcxxrt[libunwind=,static-libs?,${MULTILIB_USEDEP}] )
		!libcxxabi? ( !libcxxrt? ( >=sys-devel/gcc-4.7:=[cxx] ) )
	)
	elibc_Darwin? ( !sys-libs/libcxx-headers )"
# llvm-3.9.0 needed because its cmake files installation path changed, which is
# needed by libcxx
# clang-3.9.0 installs necessary target symlinks unconditionally
# which removes the need for MULTILIB_USEDEP
DEPEND="${RDEPEND}
	test? ( >=sys-devel/clang-3.9.0
		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]') )
	app-arch/xz-utils
	>=sys-devel/llvm-3.9.0"

DOCS=( CREDITS.TXT )

PATCHES=(
	# Add link flag "-Wl,-z,defs" to avoid underlinking; this is needed in a
	# out-of-tree build.
	"${FILESDIR}/${PN}-3.9-cmake-link-flags.patch"

	# Back-port of https://reviews.llvm.org/D23232, allowing building both
	# shared and static libs in one run.
	"${FILESDIR}/${PN}-3.9-cmake-static-lib.patch"
)

python_check_deps() {
	has_version "dev-python/lit[${PYTHON_USEDEP}]"
}

pkg_setup() {
	use test && python-any-r1_pkg_setup

	if ! use libcxxabi && ! use libcxxrt && ! 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
	if tc-is-gcc && [[ $(gcc-version) < 4.7 ]] ; then
		eerror "${PN} needs to be built with gcc-4.7 or later (or other"
		eerror "conformant compilers). Please use gcc-config to switch to"
		eerror "gcc-4.7 or later version."
		die
	fi
}

src_configure() {
	NATIVE_LIBDIR=$(get_libdir)
	cmake-multilib_src_configure
}

multilib_src_configure() {
	local cxxabi cxxabi_incs
	if use libcxxabi; then
		cxxabi=libcxxabi
		cxxabi_incs="${EPREFIX}/usr/include/libcxxabi"
	elif use libcxxrt; then
		cxxabi=libcxxrt
		cxxabi_incs="${EPREFIX}/usr/include/libcxxrt"
	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

	# 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
	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
			# get the full library list out of 'pretend mode'
			# and grep it for libclang_rt references
			local args=( $($(tc-getCC) -### -x c - 2>&1 | tail -n 1) )
			local i
			for i in "${args[@]}"; do
				if [[ ${i} == *libclang_rt* ]]; then
					want_gcc_s=OFF
					extra_libs+=( "${i}" )
				fi
			done
		fi
	fi
	# Darwin has libunwind in its system
	[[ ${CHOST} == *-darwin* ]] && want_gcc_s=OFF

	local libdir=$(get_libdir)
	local mycmakeargs=(
		# LLVM_LIBDIR_SUFFIX is used to find CMake files
		# and we are happy to use the native set
		-DLLVM_LIBDIR_SUFFIX=${NATIVE_LIBDIR#lib}
		-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=$(usex test)
		-DCMAKE_SHARED_LINKER_FLAGS="${extra_libs[*]} ${LDFLAGS}"
		# avoid guessing of libcxxabi version by installed SDK discovered
		# via xc-run - we know better because we require a libcxxabi version
		# matching our own
		-DLIBCXX_LIBCPPABI_VERSION=2
	)

	if use test; then
		mycmakeargs+=(
			# this can be any directory, it just needs to exist...
			-DLLVM_MAIN_SRC_DIR="${T}"
			-DLIT_COMMAND="${EPREFIX}"/usr/bin/lit
		)
	fi

	# make sure we build multilib on OSX, because llvm insists on
	# building multilib too
	[[ ${CHOST} == *86*-darwin* ]] && append-flags -arch i386 -arch x86_64

	cmake-utils_src_configure
}

multilib_src_test() {
	local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)

	[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
	sed -i -e "/cxx_under_test/s^\".*\"^\"${clang_path}\"^" test/lit.site.cfg || die

	cmake-utils_src_make check-libcxx
}

# 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" "$(usex libcxxrt "libcxxrt.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" "$(usex libcxxrt "libcxxrt.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-utils_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."
}