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

EAPI=5

ESVN_REPO_URI="http://llvm.org/svn/llvm-project/libcxx/trunk"

[ "${PV%9999}" != "${PV}" ] && SCM="subversion" || SCM=""

inherit ${SCM} flag-o-matic toolchain-funcs multilib multilib-minimal

DESCRIPTION="New implementation of the C++ standard library, targeting C++11"
HOMEPAGE="http://libcxx.llvm.org/"
if [ "${PV%9999}" = "${PV}" ] ; 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 [ "${PV%9999}" = "${PV}" ] ; then
	KEYWORDS="~x64-macos ~x86-macos"
else
	KEYWORDS=""
fi
IUSE="elibc_glibc +libcxxrt static-libs test"

REQUIRED_USE="kernel_Darwin? ( libcxxrt !static-libs )"
RDEPEND="
	!kernel_Darwin? (
		libcxxrt? ( >=sys-libs/libcxxrt-0.0_p20130725[static-libs?,${MULTILIB_USEDEP}] )
		!libcxxrt? ( >=sys-devel/gcc-4.7[cxx] )
	)
	kernel_Darwin? (
		=sys-libs/libcxx-headers-${PV}
		=sys-libs/libcxxabi-${PV}
		sys-devel/clang
	)"
DEPEND="${RDEPEND}
	test? ( sys-devel/clang )
	app-arch/xz-utils"

DOCS=( CREDITS.TXT )

pkg_setup() {
	if [[ ${CHOST} == *darwin* ]] ; then
		MY_CC=$(tc-getCC)
		MY_CXX=$(tc-getCXX)
		if [[ ${MY_CC} != *clang* || ${MY_CXX} != *clang++* ]] ; then
			eerror "${PN} needs to be built with clang++. Please do not override"
			eerror "CC ($MY_CC) and CXX ($MY_CXX)"
			eerror "or point them at clang and clang++ respectively."
			die
		fi
		return
	fi
	if ! use libcxxrt ; then
		ewarn "You have disabled USE=libcxxrt. This will build ${PN} against"
		ewarn "libsupc++. Please note that this is not well supported."
		ewarn "In particular, static linking will not work."
	fi
	if [[ $(gcc-version) < 4.7 ]] && [[ $(tc-getCXX) != *clang++* ]] ; then
		eerror "${PN} needs to be built with clang++ or gcc-4.7 or later."
		eerror "Please use gcc-config to switch to gcc-4.7 or later version."
		die
	fi
}

src_prepare() {
	cp -f "${FILESDIR}/Makefile" lib/ || die

	if [[ ${CHOST} == *darwin* ]] ; then
		epatch "${FILESDIR}"/${PN}-3.5.1-olddarwin.patch

		[[ "${CHOST##*-darwin}" -le 10 ]] && \
			epatch "${FILESDIR}"/${PN}-3.5.1-cmath-conv.patch

		# libc++abi needs stack unwinding functions provided by libSystem on
		# Mac OS X >= 10.6. On < 10.6 they're in libgcc_s. So force link
		# against that. Additionally, the crt1.o provided by our gcc-apple
		# toolchain isn't universal. Since that's needed for linking any
		# program on OS X < 10.7, universal support is effectively broken on
		# those older OS Xes even if clang and libc++{,abi} were to support it.
		# So we can just disable universal compilation.
		gcc_s=gcc_s.1
		[[ "${CHOST##*-darwin}" -eq 9 ]] && gcc_s=gcc_s.10.5
		[[ "${CHOST##*-darwin}" -eq 8 ]] && gcc_s=gcc_s.10.4
		[[ "${CHOST##*-darwin}" -le 9 ]]  && \
			sed -i -e "s,/usr/lib/libSystem.B.dylib,-lSystem -l${gcc_s},g" \
				-e "s,-arch i386 -arch x86_64,,g" \
				lib/buildit

		if [[ "${CHOST##*-darwin}" -le 8 ]] ; then
			epatch "${FILESDIR}"/${PN}-3.5.1-availability.patch
			epatch "${FILESDIR}"/${PN}-3.5.1-eprintf.patch
		fi

		# fix library install names
		sed -i \
			-e "s,/usr/lib/libc++abi\.dylib,${EPREFIX}/usr/lib/libc++abi.dylib,g" \
			-e "s,/usr/lib/libc++\.1\.dylib,${EPREFIX}/usr/lib/libc++.1.dylib,g" \
			lib/buildit
	fi

	multilib_copy_sources
}

src_configure() {
	tc-export AR CC CXX

	# on Darwin we're all set
	[[ ${CHOST} == *darwin* ]] && return

	export LIBS="-lpthread -lrt -lc -lgcc_s"
	if use libcxxrt ; then
		append-cppflags -DLIBCXXRT "-I${EPREFIX}/usr/include/libcxxrt/"
		LIBS="-lcxxrt ${LIBS}"
		cp "${EPREFIX}/usr/include/libcxxrt/"*.h "${S}/include"
	else
		# Very hackish, see $HOMEPAGE
		# If someone has a clever idea, please share it!
		local includes="$(echo | ${CHOST}-g++ -Wp,-v -x c++ - -fsyntax-only 2>&1 | grep -C 2 '#include.*<...>' | tail -n 2 | sed -e 's/^ /-I/' | tr '\n' ' ')"
		local libcxx_gcc_dirs="$(echo | ${CHOST}-g++ -Wp,-v -x c++ - -fsyntax-only 2>&1 | grep -C 2 '#include.*<...>' | tail -n 2 | tr '\n' ' ')"
		append-cppflags -D__GLIBCXX__ ${includes}
		LIBS="-lsupc++ ${LIBS}"
		local libsupcxx_includes="cxxabi.h bits/c++config.h bits/os_defines.h bits/cpu_defines.h bits/cxxabi_tweaks.h bits/cxxabi_forced.h"
		for i in ${libsupcxx_includes} ; do
			local found=""
			[ -d "${S}/include/$(dirname ${i})/" ] || mkdir -p "${S}/include/$(dirname ${i})"
			for j in ${libcxx_gcc_dirs} ; do
				if [ -f "${j}/${i}" ] ; then
					cp "${j}/${i}" "${S}/include/$(dirname ${i})/" || die
					found=yes
				fi
			done
			[ -n "${found}" ] || die "Header not found: ${i}"
		done
	fi

	append-ldflags "-Wl,-z,defs" # make sure we are not underlinked
}

multilib_src_compile() {
	cd "${BUILD_DIR}/lib" || die
	if [[ ${CHOST} == *darwin* ]] ; then
		TRIPLE=-apple- ./buildit || die
		return
	fi

	emake shared
	use static-libs && emake static
}

# Tests fail for now, if anybody is able to fix them, help is very welcome.
multilib_src_test() {
	cd "${BUILD_DIR}/test"
	LD_LIBRARY_PATH="${BUILD_DIR}/lib:${LD_LIBRARY_PATH}" \
		CC="clang++ $(get_abi_CFLAGS) ${CXXFLAGS}" \
		HEADER_INCLUDE="-I${BUILD_DIR}/include" \
		SOURCE_LIB="-L${BUILD_DIR}/lib" \
		LIBS="-lm $(usex libcxxrt -lcxxrt "")" \
		./testit || die
	# TODO: fix link against libsupc++
}

# 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() {
	if use libcxxrt ; then
		# Move it first.
		mv "${ED}/usr/$(get_libdir)/libc++.a" "${ED}/usr/$(get_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="${EPREFIX}/usr/$(get_libdir)/libc++_static.a ${EPREFIX}/usr/$(get_libdir)/libcxxrt.a"
		# On Linux/glibc it does not link without libpthread or libdl. It is
		# fine on FreeBSD.
		use elibc_glibc && deps="${deps} ${EPREFIX}/usr/$(get_libdir)/libpthread.a ${EPREFIX}/usr/$(get_libdir)/libdl.a"

		gen_ldscript "${deps}" > "${ED}/usr/$(get_libdir)/libc++.a"
	fi
	# TODO: Generate a libc++.a ldscript when building against libsupc++
}

gen_shared_ldscript() {
	if use libcxxrt ; then
		mv "${ED}/usr/$(get_libdir)/libc++.so" "${ED}/usr/$(get_libdir)/libc++_shared.so" || die
		local deps="${EPREFIX}/usr/$(get_libdir)/libc++_shared.so ${EPREFIX}/usr/$(get_libdir)/libcxxrt.so"
		gen_ldscript "${deps}" > "${ED}/usr/$(get_libdir)/libc++.so"
	fi
	# TODO: Generate the linker script for other confiurations too.
}

multilib_src_install() {
	cd "${BUILD_DIR}/lib"
	if [[ ${CHOST} == *darwin* ]] ; then
		dolib.so libc++*dylib
		return
	fi

	if use static-libs ; then
		dolib.a libc++.a
		gen_static_ldscript
	fi
	dolib.so libc++.so*
	gen_shared_ldscript
}

multilib_src_install_all() {
	einstalldocs
	# libc++abi needs the libc++ headers and we need libc++abi so the headers
	# are already installed
	[[ ${CHOST} == *darwin* ]] && return
	insinto /usr/include/c++/v1
	doins -r include/*
}

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."
}