# Copyright 1999-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=5

PYTHON_COMPAT=( python2_7 pypy )

inherit eutils flag-o-matic multibuild multilib \
	multilib-minimal python-r1 toolchain-funcs pax-utils check-reqs prefix

DESCRIPTION="Low Level Virtual Machine"
HOMEPAGE="http://llvm.org/"
SRC_URI="http://llvm.org/releases/${PV}/${P}.src.tar.xz
	clang? ( http://llvm.org/releases/${PV}/compiler-rt-${PV}.src.tar.xz
		http://llvm.org/releases/${PV}/cfe-${PV}.src.tar.xz
		http://llvm.org/releases/${PV}/clang-tools-extra-${PV}.src.tar.xz )
	!doc? ( https://dev.gentoo.org/~voyageur/distfiles/${P}-manpages.tar.bz2 )"

LICENSE="UoI-NCSA"
SLOT="0/3.5"
KEYWORDS="amd64 arm ppc ppc64 ~sparc x86 ~amd64-fbsd ~x86-fbsd ~x64-freebsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos"
IUSE="clang debug doc gold libedit +libffi multitarget ncurses ocaml python
	+static-analyzer test xml video_cards_radeon
	kernel_Darwin kernel_FreeBSD"

COMMON_DEPEND="
	sys-libs/zlib:0=
	clang? (
		python? ( ${PYTHON_DEPS} )
		static-analyzer? (
			dev-lang/perl:*
			${PYTHON_DEPS}
		)
		xml? ( dev-libs/libxml2:2= )
	)
	gold? ( >=sys-devel/binutils-2.22:*[cxx] )
	libedit? ( dev-libs/libedit:0=[${MULTILIB_USEDEP}] )
	libffi? ( >=virtual/libffi-3.0.13-r1:0=[${MULTILIB_USEDEP}] )
	ncurses? ( >=sys-libs/ncurses-5.9-r3:0=[${MULTILIB_USEDEP}] )
	ocaml? ( dev-lang/ocaml:0= )"
# configparser-3.2 breaks the build (3.3 or none at all are fine)
DEPEND="${COMMON_DEPEND}
	app-arch/xz-utils
	dev-lang/perl
	>=sys-devel/make-3.81
	>=sys-devel/flex-2.5.4
	>=sys-devel/bison-1.875d
	|| ( >=sys-devel/gcc-3.0 >=sys-devel/gcc-apple-4.2.1
		( >=sys-freebsd/freebsd-lib-9.1-r10 sys-libs/libcxx )
	)
	|| ( >=sys-devel/binutils-2.18 >=sys-devel/binutils-apple-5.1 )
	clang? ( xml? ( virtual/pkgconfig ) )
	doc? ( dev-python/sphinx )
	libffi? ( virtual/pkgconfig )
	!!<dev-python/configparser-3.3.0.2
	${PYTHON_DEPS}"
RDEPEND="${COMMON_DEPEND}
	clang? ( !<=sys-devel/clang-${PV}-r99
		!>=sys-devel/clang-9999 )
	abi_x86_32? ( !<=app-emulation/emul-linux-x86-baselibs-20130224-r2
		!app-emulation/emul-linux-x86-baselibs[-abi_x86_32(-)] )"
PDEPEND="clang? ( =sys-devel/clang-${PV}-r100 )"

# pypy gives me around 1700 unresolved tests due to open file limit
# being exceeded. probably GC does not close them fast enough.
REQUIRED_USE="${PYTHON_REQUIRED_USE}
	test? ( || ( $(python_gen_useflags 'python*') ) )"

S=${WORKDIR}/${P}.src

# Some people actually override that in make.conf. That sucks since
# we need to run install per-directory, and ninja can't do that...
# so why did it call itself ninja in the first place?
CMAKE_MAKEFILE_GENERATOR=emake

pkg_pretend() {
	# in megs
	# !clang !debug !multitarget -O2       400
	# !clang !debug  multitarget -O2       550
	#  clang !debug !multitarget -O2       950
	#  clang !debug  multitarget -O2      1200
	# !clang  debug  multitarget -O2      5G
	#  clang !debug  multitarget -O0 -g  12G
	#  clang  debug  multitarget -O2     16G
	#  clang  debug  multitarget -O0 -g  14G

	local build_size=550
	use clang && build_size=1200

	if use debug; then
		ewarn "USE=debug is known to increase the size of package considerably"
		ewarn "and cause the tests to fail."
		ewarn

		(( build_size *= 14 ))
	elif is-flagq '-g?(gdb)?([1-9])'; then
		ewarn "The C++ compiler -g option is known to increase the size of the package"
		ewarn "considerably. If you run out of space, please consider removing it."
		ewarn

		(( build_size *= 10 ))
	fi

	# Multiply by number of ABIs :).
	local abis=( $(multilib_get_enabled_abis) )
	(( build_size *= ${#abis[@]} ))

	local CHECKREQS_DISK_BUILD=${build_size}M
	check-reqs_pkg_pretend

	if [[ ${MERGE_TYPE} != binary ]]; then
		echo 'int main() {return 0;}' > "${T}"/test.cxx || die
		ebegin "Trying to build a C++11 test program"
		if ! $(tc-getCXX) -std=c++11 -o /dev/null "${T}"/test.cxx; then
			eerror "LLVM-${PV} requires C++11-capable C++ compiler. Your current compiler"
			eerror "does not seem to support -std=c++11 option. Please upgrade your compiler"
			eerror "to gcc-4.7 or an equivalent version supporting C++11."
			die "Currently active compiler does not support -std=c++11"
		fi
		eend ${?}
	fi
}

pkg_setup() {
	pkg_pretend
}

src_unpack() {
	default

	rm -f "${S}"/tools/clang "${S}"/projects/compiler-rt \
		|| die "symlinks removal failed"

	if use clang; then
		mv "${WORKDIR}"/cfe-${PV}.src "${S}"/tools/clang \
			|| die "clang source directory move failed"
		mv "${WORKDIR}"/compiler-rt-${PV}.src "${S}"/projects/compiler-rt \
			|| die "compiler-rt source directory move failed"
		mv "${WORKDIR}"/clang-tools-extra-${PV}.src "${S}"/tools/clang/tools/extra \
			|| die "clang-tools-extra source directory move failed"
	fi
}

src_prepare() {
	epatch "${FILESDIR}"/${PN}-3.2-nodoctargz.patch
	epatch "${FILESDIR}"/${PN}-3.5-gcc-4.9.patch
	epatch "${FILESDIR}"/${PN}-3.5-gentoo-install.patch

	epatch "${FILESDIR}"/${P}-fix_LLVMExports_cmake.patch

	if use clang; then
		# Automatically select active system GCC's libraries, bugs #406163 and #417913
		epatch "${FILESDIR}"/clang-3.5-gentoo-runtime-gcc-detection-v3.patch

		epatch "${FILESDIR}"/clang-3.5-gentoo-install.patch
		epatch "${FILESDIR}"/clang-3.4-darwin_prefix-include-paths.patch
		eprefixify tools/clang/lib/Frontend/InitHeaderSearch.cpp
	fi

	if use prefix && use clang; then
		sed -i -e "/^CFLAGS /s@-Werror@-I${EPREFIX}/usr/include@" \
			projects/compiler-rt/make/platform/clang_*.mk || die
	fi

	local sub_files=(
		Makefile.config.in
		Makefile.rules
		tools/llvm-config/llvm-config.cpp
	)
	use clang && sub_files+=(
		tools/clang/lib/Driver/Tools.cpp
		tools/clang/tools/scan-build/scan-build
	)

	# unfortunately ./configure won't listen to --mandir and the-like, so take
	# care of this.
	# note: we're setting the main libdir intentionally.
	# where per-ABI is appropriate, we use $(GENTOO_LIBDIR) make.
	einfo "Fixing install dirs"
	sed -e "s,@libdir@,$(get_libdir),g" \
		-e "s,@PF@,${PF},g" \
		-e "s,@EPREFIX@,${EPREFIX},g" \
		-i "${sub_files[@]}" \
		|| die "install paths sed failed"

	if use clang; then
		# constantly fails for a long time, likely due to our patches
		rm tools/clang/test/Driver/cross-linux.c || die
	fi

	# User patches
	epatch_user

	python_setup
}

multilib_src_configure() {
	# disable timestamps since they confuse ccache
	local conf_flags=(
		--disable-timestamps
		--enable-keep-symbols
		--enable-shared
		--with-optimize-option=
		$(tc-is-static-only && echo --disable-shared)
		$(use_enable !debug optimized)
		$(use_enable debug assertions)
		$(use_enable debug expensive-checks)
		$(use_enable libedit)
		$(use_enable ncurses terminfo)
		$(use_enable libffi)
	)

	# well, it's used only by clang executable c-index-test
	if multilib_is_native_abi && use clang && use xml; then
		conf_flags+=( XML2CONFIG="$(tc-getPKG_CONFIG) libxml-2.0" )
	else
		conf_flags+=( ac_cv_prog_XML2CONFIG="" )
	fi

	local targets bindings
	if use multitarget; then
		targets='all'
	else
		targets='host,cpp'
		use video_cards_radeon && targets+=',r600'
	fi
	conf_flags+=( --enable-targets=${targets} )

	if multilib_is_native_abi; then
		use gold && conf_flags+=( --with-binutils-include="${EPREFIX}"/usr/include/ )
		# extra commas don't hurt
		use ocaml && bindings+=',ocaml'
	fi

	[[ ${bindings} ]] || bindings='none'
	conf_flags+=( --enable-bindings=${bindings} )

	if use libffi; then
		local CPPFLAGS=${CPPFLAGS}
		append-cppflags "$(pkg-config --cflags libffi)"
	fi

	# llvm prefers clang over gcc, so we may need to force that
	tc-export CC CXX

	ECONF_SOURCE=${S} \
	econf "${conf_flags[@]}"
}

set_makeargs() {
	MAKEARGS=(
		VERBOSE=1
		REQUIRES_RTTI=1
		GENTOO_LIBDIR=$(get_libdir)
	)

	# for tests, we want it all! otherwise, we may use a little filtering...
	# adding ONLY_TOOLS also disables unittest building...
	if [[ ${EBUILD_PHASE_FUNC} != src_test ]]; then
		local tools=( llvm-config )
		use clang && tools+=( clang )

		if multilib_is_native_abi; then
			tools+=(
				opt llvm-as llvm-dis llc llvm-ar llvm-nm llvm-link lli
				llvm-extract llvm-mc llvm-bcanalyzer llvm-diff macho-dump
				llvm-objdump llvm-readobj llvm-rtdyld llvm-dwarfdump llvm-cov
				llvm-size llvm-stress llvm-mcmarkup llvm-profdata
				llvm-symbolizer obj2yaml yaml2obj lto bugpoint
			)

			# the build system runs explicitly specified tools in parallel,
			# so we need to split it into two runs
			if [[ ${1} != -1 ]]; then
				# those require lto
				tools+=( llvm-lto )
				use gold && tools+=( gold )

				# those require clang :)
				# we need to explicitly specify all its tools
				# since we're passing BUILD_CLANG_ONLY
				use clang && tools+=(
					clang/tools/{clang-check,clang-format,extra}
				)
			fi
		fi

		MAKEARGS+=(
			# filter tools + disable unittests implicitly
			ONLY_TOOLS="${tools[*]}"

			# this disables unittests & docs from clang
			BUILD_CLANG_ONLY=YES
		)
	fi
}

multilib_src_compile() {
	local MAKEARGS
	set_makeargs -1
	emake "${MAKEARGS[@]}"

	if multilib_is_native_abi; then
		set_makeargs
		emake -C tools "${MAKEARGS[@]}"

		if use doc; then
			emake -C "${S}"/docs -f Makefile.sphinx man
			use clang && emake -C "${S}"/tools/clang/docs/tools \
				BUILD_FOR_WEBSITE=1 DST_MAN_DIR="${T}"/ man
			emake -C "${S}"/docs -f Makefile.sphinx html
		fi
	fi

	if use debug; then
		pax-mark m Debug+Asserts+Checks/bin/llvm-rtdyld
		pax-mark m Debug+Asserts+Checks/bin/lli
		pax-mark m Debug+Asserts+Checks/bin/lli-child-target
	else
		pax-mark m Release/bin/llvm-rtdyld
		pax-mark m Release/bin/lli
		pax-mark m Release/bin/lli-child-target
	fi
}

multilib_src_test() {
	local MAKEARGS
	set_makeargs

	# build the remaining tools & unittests
	emake "${MAKEARGS[@]}"

	pax-mark m unittests/ExecutionEngine/JIT/Release/JITTests
	pax-mark m unittests/ExecutionEngine/MCJIT/Release/MCJITTests
	pax-mark m unittests/Support/Release/SupportTests

	# respect TMPDIR!
	local -x LIT_PRESERVES_TMP=1
	emake "${MAKEARGS[@]}" check
	use clang && emake "${MAKEARGS[@]}" -C tools/clang test
}

src_install() {
	local MULTILIB_CHOST_TOOLS=(
		/usr/bin/llvm-config
	)

	local MULTILIB_WRAPPED_HEADERS=(
		/usr/include/llvm/Config/config.h
		/usr/include/llvm/Config/llvm-config.h
	)

	if use clang; then
		# note: magic applied below
		MULTILIB_CHOST_TOOLS+=(
			/usr/bin/clang
			/usr/bin/clang++
			/usr/bin/clang-${PV}
			/usr/bin/clang++-${PV}
		)

		MULTILIB_WRAPPED_HEADERS+=(
			/usr/include/clang/Config/config.h
		)
	fi

	multilib-minimal_src_install

	# Remove unnecessary headers on FreeBSD, bug #417171
	use kernel_FreeBSD && use clang && rm "${ED}"usr/lib/clang/${PV}/include/{std,float,iso,limits,tgmath,varargs}*.h
}

multilib_src_install() {
	local MAKEARGS
	set_makeargs

	local root=${D}/_${ABI}

	emake "${MAKEARGS[@]}" DESTDIR="${root}" install
	multibuild_merge_root "${root}" "${D}"

	if ! multilib_is_native_abi; then
		# Backwards compat, will be happily removed someday.
		dosym "${CHOST}"-llvm-config /usr/bin/llvm-config.${ABI}
	else
		# Install docs.
		if use doc; then
			doman "${S}"/docs/_build/man/*.1
			use clang && doman "${T}"/clang.1
			dohtml -r "${S}"/docs/_build/html/
		else
			if ! use clang; then
				rm "${WORKDIR}"/${P}-manpages/clang.1 || die
			fi
			doman "${WORKDIR}"/${P}-manpages/*.1
		fi

		# Symlink the gold plugin.
		if use gold; then
			dodir /usr/${CHOST}/binutils-bin/lib/bfd-plugins
			dosym ../../../../$(get_libdir)/LLVMgold.so \
				/usr/${CHOST}/binutils-bin/lib/bfd-plugins/LLVMgold.so
		fi
	fi

	# apply CHOST and PV to clang executables
	# they're statically linked so we don't have to worry about the lib
	if use clang; then
		local clang_tools=( clang clang++ )
		local i

		# append ${PV} and symlink back
		# TODO: use alternatives.eclass? does that make any sense?
		# maybe with USE=-clang on :0 and USE=clang on older
		for i in "${clang_tools[@]}"; do
			mv "${ED%/}/usr/bin/${i}"{,-${PV}} || die
			dosym "${i}"-${PV} /usr/bin/${i}
		done

		# now prepend ${CHOST} and let the multilib-build.eclass symlink it
		if ! multilib_is_native_abi; then
			# non-native? let's replace it with a simple wrapper
			for i in "${clang_tools[@]}"; do
				rm "${ED%/}/usr/bin/${i}-${PV}" || die
				cat > "${T}"/wrapper.tmp <<-_EOF_
					#!${EPREFIX}/bin/sh
					exec "${i}-${PV}" $(get_abi_CFLAGS) "\${@}"
				_EOF_
				newbin "${T}"/wrapper.tmp "${i}-${PV}"
			done
		fi
	fi

	# Fix install_names on Darwin.  The build system is too complicated
	# to just fix this, so we correct it post-install
	local lib= f= odylib= ndylib= libpv=${PV}
	if [[ ${CHOST} == *-darwin* ]] ; then
		eval $(grep PACKAGE_VERSION= configure)
		[[ -n ${PACKAGE_VERSION} ]] && libpv=${PACKAGE_VERSION}
		libpvminor=${libpv%.[0-9]*}
		for lib in lib{EnhancedDisassembly,LLVM-${libpv},LTO,profile_rt,clang}.dylib LLVMHello.dylib clang/${libpv}/lib/darwin/libclang_rt.asan_{osx,iossim}_dynamic.dylib; do
			# libEnhancedDisassembly is Darwin10 only, so non-fatal
			# + omit clang libs if not enabled
			[[ -f ${ED}/usr/lib/${lib} ]] || continue

			ebegin "fixing install_name of $lib"
			install_name_tool \
				-id "${EPREFIX}"/usr/lib/${lib} \
				"${ED}"/usr/lib/${lib}
			eend $?
		done
		for f in "${ED}"/usr/bin/* "${ED}"/usr/lib/lib*.dylib "${ED}"/usr/lib/clang/${libpv}/lib/darwin/*.dylib ; do
			# omit clang libs if not enabled
			[[ -f "${f}" ]] || continue

			scanmacho -BF'%n#f' "${f}" | tr ',' '\n' | \
			while read odylib ; do
				ndylib=
				case ${odylib} in
					*/libclang.dylib)
						ndylib="${EPREFIX}"/usr/lib/libclang.dylib
						;;
					*/libLLVM-${libpv}.dylib)
						ndylib="${EPREFIX}"/usr/lib/libLLVM-${libpv}.dylib
						;;
					*/libLLVM-${libpvminor}.dylib)
						ndylib="${EPREFIX}"/usr/lib/libLLVM-${libpvminor}.dylib
						;;
					*/libLTO.dylib)
						ndylib="${EPREFIX}"/usr/lib/libLTO.dylib
						;;
				esac
				if [[ -n ${ndylib} ]] ; then
					ebegin "fixing install_name reference to ${odylib} of ${f##*/}"
					install_name_tool \
						-change "${odylib}" "${ndylib}" \
						"${f}"
					eend $?
				fi
			done
		done
	fi
}

multilib_src_install_all() {
	insinto /usr/share/vim/vimfiles/syntax
	doins utils/vim/*.vim

	if use clang; then
		cd tools/clang || die

		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
		fi

		python_inst() {
			if use static-analyzer ; then
				pushd tools/scan-view >/dev/null || die

				python_doscript scan-view

				touch __init__.py || die
				python_moduleinto clang
				python_domodule __init__.py Reporter.py Resources ScanView.py startfile.py

				popd >/dev/null || die
			fi

			if use python ; then
				pushd bindings/python/clang >/dev/null || die

				python_moduleinto clang
				python_domodule __init__.py cindex.py enumerations.py

				popd >/dev/null || die
			fi

			# AddressSanitizer symbolizer (currently separate)
			python_doscript "${S}"/projects/compiler-rt/lib/asan/scripts/asan_symbolize.py
		}
		python_foreach_impl python_inst
	fi
}