# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=3

RESTRICT_PYTHON_ABIS="3.*"
SUPPORT_PYTHON_ABIS="1"

inherit eutils multilib python

DESCRIPTION="C language family frontend for LLVM"
HOMEPAGE="http://clang.llvm.org/"
# Fetching LLVM as well: see http://llvm.org/bugs/show_bug.cgi?id=4840
# Drop the -> on 2.9
SRC_URI="http://llvm.org/releases/${PV}/llvm-${PV}.tgz -> llvm-${PV}-r1.tgz
	http://llvm.org/releases/${PV}/${P}.tgz"

LICENSE="UoI-NCSA"
SLOT="0"
KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux ~ppc-macos"
IUSE="debug multitarget +static-analyzer system-cxx-headers test"

# Note: for LTO support, clang will depend on binutils with gold plugins, and LLVM built after that - http://llvm.org/docs/GoldPlugin.html
DEPEND="static-analyzer? ( dev-lang/perl )"
RDEPEND="~sys-devel/llvm-${PV}[debug=,multitarget=]"

S="${WORKDIR}/llvm-${PV}"

src_prepare() {
	mv "${WORKDIR}"/clang-${PV} "${S}"/tools/clang || die "clang source directory not found"

	# Same as llvm doc patches
	epatch "${FILESDIR}"/${PN}-2.7-fixdoc.patch

	# Upstream backport, r117774 and r117775
	epatch "${FILESDIR}"/${P}-alignof.patch
	# Upstream backport, r119348
	epatch "${FILESDIR}"/${P}-gcc-4.4.4.patch

	# Fix toolchain lookup for Darwin/Prefix.
	epatch "${FILESDIR}"/${PN}-2.8-darwin-prefix.patch
	sed -e "s|@GENTOO_PORTAGE_CHOST_ARCH@|${CHOST%%-darwin*}-darwin|g" \
		-e "s|@GENTOO_PORTAGE_CHOST@|${CHOST}|g" \
		-e "s|@GENTOO_PORTAGE_EPREFIX@|${EPREFIX}|g" \
		-i tools/clang/lib/Driver/ToolChains.cpp \
		|| die "fixing toolchain lookup"

	# multilib-strict
	sed -e "/PROJ_headers/s#lib/clang#$(get_libdir)/clang#" \
		-i tools/clang/lib/Headers/Makefile \
		|| die "clang Makefile failed"
	# fix the static analyzer for in-tree install
	sed -e 's/import ScanView/from clang \0/'  \
		-i tools/clang/tools/scan-view/scan-view \
		|| die "scan-view sed failed"
	sed -e "/scanview.css\|sorttable.js/s#\$RealBin#${EPREFIX}/usr/share/${PN}#" \
		-i tools/clang/tools/scan-build/scan-build \
		|| die "scan-build sed failed"
	# Specify python version
	python_convert_shebangs 2 tools/clang/tools/scan-view/scan-view

	# From llvm src_prepare
	einfo "Fixing install dirs"
	sed -e 's,^PROJ_docsdir.*,PROJ_docsdir := $(PROJ_prefix)/share/doc/'${PF}, \
		-e 's,^PROJ_etcdir.*,PROJ_etcdir := '"${EPREFIX}"'/etc/llvm,' \
		-e 's,^PROJ_libdir.*,PROJ_libdir := $(PROJ_prefix)/'$(get_libdir)/llvm, \
		-i Makefile.config.in || die "Makefile.config sed failed"

	einfo "Fixing rpath and CFLAGS"
	sed -e 's,\$(RPATH) -Wl\,\$(\(ToolDir\|LibDir\)),$(RPATH) -Wl\,'"${EPREFIX}"/usr/$(get_libdir)/llvm, \
		-e '/OmitFramePointer/s/-fomit-frame-pointer//' \
		-i Makefile.rules || die "rpath sed failed"
}

src_configure() {
	local CONF_FLAGS="--enable-shared"

	if use debug; then
		CONF_FLAGS="${CONF_FLAGS} --disable-optimized"
		einfo "Note: Compiling LLVM in debug mode will create huge and slow binaries"
		# ...and you probably shouldn't use tmpfs, unless it can hold 900MB
	else
		CONF_FLAGS="${CONF_FLAGS} \
			--enable-optimized \
			--with-optimize-option= \
			--disable-assertions \
			--disable-expensive-checks"
	fi

	# Setup the search path to include the Prefix includes
	if use prefix ; then
		CONF_FLAGS="${CONF_FLAGS} \
			--with-c-include-dirs=${EPREFIX}/usr/include:/usr/include"
	fi

	if use multitarget; then
		CONF_FLAGS="${CONF_FLAGS} --enable-targets=all"
	else
		CONF_FLAGS="${CONF_FLAGS} --enable-targets=host-only"
	fi

	if use amd64; then
		CONF_FLAGS="${CONF_FLAGS} --enable-pic"
	fi

	# Skip llvm-gcc parts even if installed
	CONF_FLAGS="${CONF_FLAGS} --with-llvmgccdir=/dev/null"

	if use system-cxx-headers; then
		# Try to get current gcc headers path
		local CXX_PATH=$(gcc-config -L| cut -d: -f1)
		CONF_FLAGS="${CONF_FLAGS} --with-c-include-dirs=/usr/include:${CXX_PATH}/include"
		CONF_FLAGS="${CONF_FLAGS} --with-cxx-include-root=${CXX_PATH}/include/g++-v4"
		CONF_FLAGS="${CONF_FLAGS} --with-cxx-include-arch=$CHOST"
		if has_multilib_profile; then
			CONF_FLAGS="${CONF_FLAGS} --with-cxx-include-32bit-dir=32"
		fi
	fi

	econf ${CONF_FLAGS} || die "econf failed"
}

src_compile() {
	emake VERBOSE=1 KEEP_SYMBOLS=1 REQUIRES_RTTI=1 clang-only || die "emake failed"
}

src_test() {
	cd "${S}"/test || die "cd failed"
	emake site.exp || die "updating llvm site.exp failed"

	cd "${S}"/tools/clang || die "cd clang failed"

	echo ">>> Test phase [test]: ${CATEGORY}/${PF}"
	if ! emake -j1 VERBOSE=1 test; then
		has test $FEATURES && die "Make test failed. See above for details."
		has test $FEATURES || eerror "Make test failed. See above for details."
	fi
}

src_install() {
	cd "${S}"/tools/clang || die "cd clang failed"
	emake KEEP_SYMBOLS=1 DESTDIR="${D}" install || die "install failed"

	if use static-analyzer ; then
		dobin tools/scan-build/ccc-analyzer
		dosym ccc-analyzer /usr/bin/c++-analyzer
		dobin tools/scan-build/scan-build

		insinto /usr/share/${PN}
		doins tools/scan-build/scanview.css
		doins tools/scan-build/sorttable.js

		cd tools/scan-view || die "cd scan-view failed"
		dobin scan-view
		install-scan-view() {
			insinto "$(python_get_sitedir)"/clang
			doins Reporter.py Resources ScanView.py startfile.py
			touch "${ED}"/"$(python_get_sitedir)"/clang/__init__.py
		}
		python_execute_function install-scan-view
	fi

	# Fix install_names on Darwin.  The build system is too complicated
	# to just fix this, so we correct it post-install
	if [[ ${CHOST} == *-darwin* ]] ; then
		for lib in libclang.dylib ; do
			ebegin "fixing install_name of $lib"
			install_name_tool -id "${EPREFIX}"/usr/lib/llvm/${lib} \
				"${ED}"/usr/lib/llvm/${lib}
			eend $?
		done
		for f in usr/bin/{c-index-test,clang} usr/lib/llvm/libclang.dylib ; do
			ebegin "fixing references in ${f##*/}"
			install_name_tool \
				-change "@rpath/libclang.dylib" \
					"${EPREFIX}"/usr/lib/llvm/libclang.dylib \
				-change "${S}"/Release/lib/libLLVM-${PV}.dylib \
					"${EPREFIX}"/usr/lib/llvm/libLLVM-${PV}.dylib \
				-change "${S}"/Release/lib/libclang.dylib \
					"${EPREFIX}"/usr/lib/llvm/libclang.dylib \
				"${ED}"/$f
			eend $?
		done
	fi
}

pkg_postinst() {
	python_mod_optimize clang
	if use system-cxx-headers; then
		elog "C++ headers search path is hardcoded to the active gcc profile one"
		elog "If you change the active gcc profile, or update gcc to a new version,"
		elog "you will have to remerge this package to update the search path"
	else
		elog "If clang++ fails to find C++ headers on your system,"
		elog "you can remerge clang with USE=system-cxx-headers to use C++ headers"
		elog "from the active gcc profile"
	fi
}

pkg_postrm() {
	python_mod_cleanup clang
}