# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-libs/libcxx/libcxx-0.0_p20130531-r1.ebuild,v 1.4 2013/07/02 21:56:24 aballier Exp $

EAPI=5

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

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

inherit cmake-utils ${SCM} base flag-o-matic toolchain-funcs multilib

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

LICENSE="|| ( UoI-NCSA MIT )"
SLOT="0"
if [ "${PV%9999}" = "${PV}" ] ; then
	KEYWORDS="~amd64 ~x86 ~amd64-fbsd ~amd64-linux ~x86-linux"
else
	KEYWORDS=""
fi
IUSE="elibc_glibc +libcxxrt static-libs"

RDEPEND="libcxxrt? ( >=sys-libs/libcxxrt-0.0_p20130530[static-libs?] )
	!libcxxrt? ( sys-devel/gcc[cxx] )"
DEPEND="${RDEPEND}
	sys-devel/clang
	app-arch/xz-utils"

PATCHES=( "${FILESDIR}/multilib.patch" )
DOCS=( "CREDITS.TXT" )

src_prepare() {
	use libcxxrt && PATCHES+=( "${FILESDIR}/cxxrt.patch" )
	base_src_prepare
}

src_configure() {
	local mycmakeargs_base=( )
	if use libcxxrt ; then
		mycmakeargs_base=(
			-DLIBCXX_CXX_ABI=libcxxrt
			-DLIBCXX_LIBCXXRT_INCLUDE_PATHS="/usr/include/libcxxrt/"
		 )
	else
		# Very hackish, see $HOMEPAGE
		# If someone has a clever idea, please share it!
		local includes="$(echo | "$(tc-getCXX)" -Wp,-v -x c++ - -fsyntax-only 2>&1 | grep -C 2 '#include.*<...>' | tail -n 2 | tr '\n' ';' | tr -d ' ')"
		mycmakeargs_base=(
			 -DLIBCXX_CXX_ABI=libsupc++
			 -DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="${includes}"
		)
	fi

	# Needs to be built with clang. gcc-4.6.3 fails at least.
	# TODO: cross-compile ?
	export CC="clang"
	export CXX="clang++"

	if use static-libs ; then
		local mycmakeargs=( "${mycmakeargs_base[@]}" "-DLIBCXX_ENABLE_SHARED=OFF" )
		BUILD_DIR="${S}_static"	cmake-utils_src_configure
	fi
	local mycmakeargs=( "${mycmakeargs_base[@]}" )
	BUILD_DIR="${S}_shared" cmake-utils_src_configure
}

src_compile() {
	use static-libs && BUILD_DIR="${S}_static" cmake-utils_src_compile
	BUILD_DIR="${S}_shared" cmake-utils_src_compile
}

# Tests fail for now, if anybody is able to fix them, help is very welcome.
src_test() {
	cd "${S}/test"
	LD_LIBRARY_PATH="${S}_shared/lib:${LD_LIBRARY_PATH}" \
		CC="clang++" \
		HEADER_INCLUDE="-I${S}/include" \
		SOURCE_LIB="-L${S}_shared/lib" \
		LIBS="-lm" \
		./testit || die
}

gen_static_ldscript() {
	if use libcxxrt ; then
		# Move it first.
		mv "${D}/${EPREFIX}/usr/$(get_libdir)/libc++.a"	"${D}/${EPREFIX}/usr/$(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.
		# Taken from toolchain-funcs.eclass:
		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} )"

		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"

		cat > "${D}/${EPREFIX}/usr/$(get_libdir)/libc++.a" <<-END_LDSCRIPT
/* GNU ld script
   Include libc++.a dependencies for 'clang++ -stdlib=libc++ -static' to work
   out of the box.
 */
${output_format}
GROUP ( ${deps} )
END_LDSCRIPT
	fi
	# TODO: Generate a libc++.a ldscript when building against libsupc++
}

src_install() {
	if use static-libs ; then
		BUILD_DIR="${S}_static" cmake-utils_src_install
		gen_static_ldscript
	fi
	BUILD_DIR="${S}_shared" cmake-utils_src_install
}

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."
}