# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-devel/llvm/llvm-9999.ebuild,v 1.71 2013/12/24 20:07:03 mgorny Exp $

EAPI=5

: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
PYTHON_COMPAT=( python2_7 pypy )

inherit check-reqs cmake-utils eutils flag-o-matic git-r3 multilib \
	multilib-minimal python-r1 toolchain-funcs pax-utils

DESCRIPTION="Low Level Virtual Machine"
HOMEPAGE="http://llvm.org/"
SRC_URI=""
EGIT_REPO_URI="http://llvm.org/git/llvm.git
	https://github.com/llvm-mirror/llvm.git"

LICENSE="UoI-NCSA"
SLOT="0/${PV}"
KEYWORDS=""
IUSE="clang debug doc gold libedit +libffi multitarget ncurses ocaml
	python +static-analyzer test xml video_cards_radeon kernel_Darwin"

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=[${MULTILIB_USEDEP}] )
	ncurses? ( >=sys-libs/ncurses-5.9-r3:5=[${MULTILIB_USEDEP}] )
	ocaml? (
		dev-lang/ocaml:0=
		dev-ml/findlib
		dev-ml/ocaml-ctypes )"
# configparser-3.2 breaks the build (3.3 or none at all are fine)
DEPEND="${COMMON_DEPEND}
	dev-lang/perl
	dev-python/sphinx
	>=sys-devel/make-3.81
	>=sys-devel/flex-2.5.4
	>=sys-devel/bison-1.875d
	|| ( >=sys-devel/gcc-3.0 >=sys-devel/llvm-3.5
		( >=sys-freebsd/freebsd-lib-9.1-r10 sys-libs/libcxx )
	)
	|| ( >=sys-devel/binutils-2.18 >=sys-devel/binutils-apple-5.1 )
	kernel_Darwin? ( sys-libs/libcxx )
	clang? ( xml? ( virtual/pkgconfig ) )
	libffi? ( virtual/pkgconfig )
	!!<dev-python/configparser-3.3.0.2
	${PYTHON_DEPS}"
RDEPEND="${COMMON_DEPEND}
	clang? ( !<=sys-devel/clang-${PV}-r99 )
	abi_x86_32? ( !<=app-emulation/emul-linux-x86-baselibs-20130224-r2
		!app-emulation/emul-linux-x86-baselibs[-abi_x86_32(-)] )"
PDEPEND="clang? ( =sys-devel/clang-${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*') ) )"

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() {
	if use clang; then
		git-r3_fetch "http://llvm.org/git/compiler-rt.git
			https://github.com/llvm-mirror/compiler-rt.git"
		git-r3_fetch "http://llvm.org/git/clang.git
			https://github.com/llvm-mirror/clang.git"
		git-r3_fetch "http://llvm.org/git/clang-tools-extra.git
			https://github.com/llvm-mirror/clang-tools-extra.git"
	fi
	git-r3_fetch

	if use clang; then
		git-r3_checkout http://llvm.org/git/compiler-rt.git \
			"${S}"/projects/compiler-rt
		git-r3_checkout http://llvm.org/git/clang.git \
			"${S}"/tools/clang
		git-r3_checkout http://llvm.org/git/clang-tools-extra.git \
			"${S}"/tools/clang/tools/extra
	fi
	git-r3_checkout
}

src_prepare() {
	epatch "${FILESDIR}"/${PN}-3.5-gcc-4.9.patch
	# Make ocaml warnings non-fatal, bug #537308
	sed -e "/RUN/s/-warn-error A//" -i test/Bindings/OCaml/*ml  || die

	# OCaml bindings need to be built before docs
	# https://llvm.org/bugs/show_bug.cgi?id=23777
	#epatch "${FILESDIR}"/...

	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-3.6-gentoo-install.patch

		# TODO: clang runtime gets installed into libXX instead of lib
	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

	# User patches
	epatch_user

	python_setup
}

multilib_src_configure() {
	local targets
	if use multitarget; then
		targets=all
	else
		targets='host;CppBackend'
		use video_cards_radeon && targets+=';R600'
	fi

	local ffi_cflags ffi_ldflags
	if use libffi; then
		ffi_cflags=$(pkg-config --cflags-only-I libffi)
		ffi_ldflags=$(pkg-config --libs-only-L libffi)
	fi

	local libdir=$(get_libdir)
	local mycmakeargs=(
		"${mycmakeargs[@]}"
		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}

		-DBUILD_SHARED_LIBS=ON
		-DLLVM_ENABLE_TIMESTAMPS=OFF
		-DLLVM_TARGETS_TO_BUILD="${targets}"

		-DLLVM_ENABLE_FFI=$(usex libffi)
		-DLLVM_ENABLE_TERMINFO=$(usex ncurses)
		-DLLVM_ENABLE_ASSERTIONS=$(usex debug)

		-DWITH_POLLY=OFF # TODO
		-DLLVM_BUILD_TESTS=$(usex test)

		-DLLVM_HOST_TRIPLE="${CHOST}"

		-DFFI_INCLUDE_DIR="${ffi_cflags#-I}"
		-DFFI_LIBRARY_DIR="${ffi_ldflags#-L}"

		-DHAVE_HISTEDIT_H=$(usex libedit)
	)

	if ! multilib_is_native_abi || ! use ocaml; then
		mycmakeargs+=(
			-DOCAMLFIND=NO
		)
	fi
#	Note: go bindings have no CMake rules at the moment
#	but let's kill the check in case they are introduced
#	if ! multilib_is_native_abi || ! use go; then
		mycmakeargs+=(
			-DGO_EXECUTABLE=GO_EXECUTABLE-NOTFOUND
		)
#	fi

	if multilib_is_native_abi; then
		mycmakeargs+=(
			-DLLVM_BUILD_DOCS=ON
			-DLLVM_ENABLE_DOXYGEN=OFF
			-DLLVM_ENABLE_SPHINX=ON
			-DSPHINX_OUTPUT_HTML=$(usex doc)

			-DLLVM_INSTALL_HTML="${EPREFIX}/usr/share/doc/${PF}/html"
		)

		if use clang; then
			mycmakeargs+=(
				-DCLANG_INSTALL_HTML="${EPREFIX}/usr/share/doc/${PF}/clang"
			)
		fi

		if use gold; then
			mycmakeargs+=(
				-DLLVM_BINUTILS_INCDIR="${EPREFIX}"/usr/include
			)
		fi
	else
		if use clang; then
			mycmakeargs+=(
				-DLLVM_EXTERNAL_CLANG_TOOLS_EXTRA_BUILD=OFF
			)
		fi
	fi

	if use clang; then
		mycmakeargs+=(
			-DCLANG_ENABLE_ARCMT=$(usex static-analyzer)
			-DCLANG_ENABLE_STATIC_ANALYZER=$(usex static-analyzer)
		)

		# -- not needed when compiler-rt is built with host compiler --
		# cmake passes host C*FLAGS to compiler-rt build
		# which is performed using clang, so we need to filter out
		# some flags clang does not support
		# (if you know some more flags that don't work, let us know)
		#filter-flags -msahf -frecord-gcc-switches
	fi

	cmake-utils_src_configure
}

multilib_src_compile() {
	cmake-utils_src_compile

	if use test; then
		pax-mark m "${BUILD_DIR}"/unittests/ExecutionEngine/Orc/OrcJITTests
		pax-mark m "${BUILD_DIR}"/unittests/ExecutionEngine/MCJIT/MCJITTests
		pax-mark m "${BUILD_DIR}"/unittests/Support/SupportTests
	fi
}

multilib_src_test() {
	# respect TMPDIR!
	local -x LIT_PRESERVES_TMP=1
	local test_targets=( check )
	use clang && test_targets+=( check-clang )
	cmake-utils_src_make "${test_targets[@]}"
}

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
}

multilib_src_install() {
	cmake-utils_src_install

	# TODO: clang_rt files are not installed... wtf?

	if multilib_is_native_abi; then
		# Install docs.
		#use doc && dohtml -r "${S}"/docs/_build/html/

		# 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
}

multilib_src_install_all() {
	pushd utils/vim >/dev/null || die
	for dir in */; do
		insinto /usr/share/vim/vimfiles/${dir}
		doins ${dir}/*.vim
	done
	popd >/dev/null || die

	if use clang; then
		pushd tools/clang >/dev/null || 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
		popd >/dev/null || die
	fi
}