# Copyright 1999-2016 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=6

: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
CMAKE_MIN_VERSION=3.4.3
DISTUTILS_OPTIONAL=1
PYTHON_COMPAT=( python2_7 )

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

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="debug +doc gold libedit +libffi multitarget ncurses ocaml test
	video_cards_radeon elibc_musl kernel_Darwin"

# python is needed for llvm-lit (which is installed)
RDEPEND="
	sys-libs/zlib:0=
	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-4.00.0:0=
		dev-ml/findlib
		dev-ml/ocaml-ctypes )
	${PYTHON_DEPS}"
# configparser-3.2 breaks the build (3.3 or none at all are fine)
DEPEND="${RDEPEND}
	dev-lang/perl
	|| ( >=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-${PV%_rc*}.9999 )
	doc? ( dev-python/sphinx )
	gold? ( sys-libs/binutils-libs )
	libffi? ( virtual/pkgconfig )
	ocaml? ( test? ( dev-ml/ounit ) )
	!!<dev-python/configparser-3.3.0.2"

REQUIRED_USE="${PYTHON_REQUIRED_USE}"

pkg_pretend() {
	# in megs
	# !debug !multitarget -O2       400
	# !debug  multitarget -O2       550
	#  debug  multitarget -O2      5G

	local build_size=550

	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
}

pkg_setup() {
	pkg_pretend
}

src_prepare() {
	# Python is needed to run tests using lit
	python_setup

	# Make ocaml warnings non-fatal, bug #537308
	sed -e "/RUN/s/-warn-error A//" -i test/Bindings/OCaml/*ml  || die
	# Fix libdir for ocaml bindings install, bug #559134
	eapply "${FILESDIR}"/9999/0001-cmake-Install-OCaml-modules-into-correct-package-loc.patch

	# Make it possible to override Sphinx HTML install dirs
	# https://llvm.org/bugs/show_bug.cgi?id=23780
	eapply "${FILESDIR}"/9999/0003-cmake-Support-overriding-Sphinx-HTML-doc-install-dir.patch

	# Prevent race conditions with parallel Sphinx runs
	# https://llvm.org/bugs/show_bug.cgi?id=23781
	eapply "${FILESDIR}"/9999/0004-cmake-Add-an-ordering-dep-between-HTML-man-Sphinx-ta.patch

	# Allow custom cmake build types (like 'Gentoo')
	eapply "${FILESDIR}"/9999/0006-cmake-Remove-the-CMAKE_BUILD_TYPE-assertion.patch

	# Fix llvm-config for shared linking and sane flags
	# https://bugs.gentoo.org/show_bug.cgi?id=565358
	eapply "${FILESDIR}"/9999/0007-llvm-config-Clean-up-exported-values-update-for-shar.patch

	# Restore SOVERSIONs for shared libraries
	# https://bugs.gentoo.org/show_bug.cgi?id=578392
	eapply "${FILESDIR}"/9999/0008-cmake-Restore-SOVERSIONs-on-shared-libraries.patch

	# Fix lit tests to find installed llvm-lit correctly
	eapply "${FILESDIR}"/9999/0009-cmake-Use-system-llvm-lit-when-lit.py-does-not-exist.patch
	# Install lit as llvm-lit (as expected by cmake)
	eapply "${FILESDIR}"/9999/0010-lit-setup.py-Install-as-llvm-lit-as-cmake-expects-it.patch

	# support building llvm against musl-libc
	use elibc_musl && eapply "${FILESDIR}"/9999/musl-fixes.patch

	# disable use of SDK on OSX, bug #568758
	sed -i -e 's/xcrun/false/' utils/lit/lit/util.py || die

	# User patches
	eapply_user

	# Native libdir is used to hold LLVMgold.so
	NATIVE_LIBDIR=$(get_libdir)
}

multilib_src_configure() {
	local targets
	if use multitarget; then
		targets=all
	else
		targets='host;BPF'
		use video_cards_radeon && targets+=';AMDGPU'
	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=$(get_libdir)
	local mycmakeargs=(
		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}

		-DBUILD_SHARED_LIBS=ON
		-DLLVM_TARGETS_TO_BUILD="${targets}"
		-DLLVM_BUILD_TESTS=$(usex test)

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

		-DWITH_POLLY=OFF # TODO

		-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=$(usex doc)
			-DLLVM_ENABLE_SPHINX=$(usex doc)
			-DLLVM_ENABLE_DOXYGEN=OFF
			-DLLVM_INSTALL_HTML="${EPREFIX}/usr/share/doc/${PF}/html"
			-DSPHINX_WARNINGS_AS_ERRORS=OFF
			-DLLVM_INSTALL_UTILS=ON
		)

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

	if tc-is-cross-compiler; then
		[[ -x "/usr/bin/llvm-tblgen" ]] \
			|| die "/usr/bin/llvm-tblgen not found or usable"
		mycmakeargs+=(
			-DCMAKE_CROSSCOMPILING=ON
			-DLLVM_TABLEGEN=/usr/bin/llvm-tblgen
		)
	fi

	cmake-utils_src_configure
}

multilib_src_compile() {
	cmake-utils_src_compile
	# TODO: not sure why this target is not correctly called
	multilib_is_native_abi && use doc && use ocaml && cmake-utils_src_make docs/ocaml_doc

	pax-mark m "${BUILD_DIR}"/bin/llvm-rtdyld
	pax-mark m "${BUILD_DIR}"/bin/lli
	pax-mark m "${BUILD_DIR}"/bin/lli-child-target

	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

	# Run setup.py for lit
	cd "${S}"/utils/lit || die
	distutils-r1_src_compile
}

multilib_src_test() {
	# respect TMPDIR!
	local -x LIT_PRESERVES_TMP=1
	cmake-utils_src_make check
}

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

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

	multilib-minimal_src_install

	# Install lit
	cd "${S}"/utils/lit || die
	distutils-r1_src_install
}

multilib_src_install() {
	cmake-utils_src_install

	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
}

multilib_src_install_all() {
	insinto /usr/share/vim/vimfiles
	doins -r utils/vim/*/.
	# some users may find it useful
	dodoc utils/vim/vimrc
}