sys-devel/llvm: Bump to 12.0.0 final

Signed-off-by: Michał Górny <mgorny@gentoo.org>

2 files changed, 527 insertions, 0 deletions

diff --git a/sys-devel/llvm/Manifest b/sys-devel/llvm/Manifest
index ac3ad9c19bd8..0b320c65807b 100644
--- a/sys-devel/llvm/Manifest
+++ b/sys-devel/llvm/Manifest
@@ -2,6 +2,7 @@ DIST llvm-10.0.1-manpages.tar.bz2 180157 BLAKE2B ddf5951c8f5a2a8a80726fd713e6c81
 DIST llvm-11.0.0-manpages.tar.bz2 179592 BLAKE2B d03dff5e7426f4c648d6112dee0fa7a91edf41584290c94c3f738fc65fa82fc6ef47b49c245fb0e741bdf267fc64534311194c476ece4b447649ba2250e61430 SHA512 1cf598f50c99a85a35b03398e4768cd1eafec9d602f788d401120adb91b3b59965216ed7102da26b7c2af7e1bbca4bca8f1d43bb687fcd8ed418e2f7076bdce4
 DIST llvm-11.0.1-manpages.tar.bz2 180888 BLAKE2B 9d70e83704d77aa5007cc8eb8e667fbb1f4dd3a8df607d0bbf4f3f5049ac04263e6e01bf8da0d212f456a49c90b853485746af68f0a1e2b5f3b704914bd45aaf SHA512 c67df394dd1a94ae632ce55ff1b1aa4cc4aa8b59b17521cd91932c1b44efe90f29e84233a0ebe882d39f54a5b28edf4ef40769e7ecc1a5f1021d64c5f99e33ad
 DIST llvm-11.1.0-manpages.tar.bz2 191571 BLAKE2B d6f8e1390dd3e6e8bbcd66c0079ef89f2ff3479743499c36ab32f8bc8281631a96113df9a87f6284058365950f4df3c75dacfcc11920fc5ea7ef0233ba842b77 SHA512 2543e519f51cc7ecb51a732c658ec5d35c5225e30a677f24ead75e81fb1ab793a030e79f21d0b702a2cf6ab6da1a2cba839b49a98e1b0a36384e98076ed5c4b1
+DIST llvm-12.0.0-manpages.tar.bz2 191228 BLAKE2B 60cc736de2512b9368d55cc8c73e8b537c0fb8f0cb923b0c5c9e5866785013df93efc6cb448c91b7635e856a8d663278a3ba40620a2e4c05c006b6fc5b482b4e SHA512 4a4f55da8da0cb7d4d9281b13168864a3c0b10000b3e750b22b93d9b4f68a2d9a2e1da10c94d27081a0bce9694fa55a9d5e723676f9066393dc8001382d1d6da
 DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3c8a6ff1a1f152f94bfe362c07884339fe571ff7fe903ed3b3deb150b2fa868c387887a0dea2930dc08b81db71a5b1 SHA512 48078fff9293a87f1a973f3348f79506f04c3da774295f5eb67d74dd2d1aa94f0973f8ced3f4ab9e8339902071f82c603b43d5608ad7227046c4da769c5d2151
 DIST llvmorg-11.0.0.tar.gz 122743665 BLAKE2B 3f95570240789fd68ddb747df817f5c6cdc9da40911bbe9ee3531c15ada9165e5002b1c2f778cf8735858485ea05a8754e3d3a5f4b15bdd6cb33d64a14692984 SHA512 b6d38871ccce0e086e27d35e42887618d68e57d8274735c59e3eabc42dee352412489296293f8d5169fe0044936345915ee7da61ebdc64ec10f7737f6ecd90f2
 DIST llvmorg-11.0.1.tar.gz 122790338 BLAKE2B 0130996b4a8c4d9f757136fd7fb318068c9bfdc565060dec0d4336480c4ab66c4ae3185a7fdb05f13cf9ee8fd4123b09df938881b75d6e5d3689595114b7e32a SHA512 f5e6ef0b3111aae08a89cd01adb2ff4abfa9ef779c68b9190421d0447efd25c2cc00e5aae9f4764805f5fa31434866043d1510ae7389817e28ae53a5442e2fdf
@@ -10,3 +11,4 @@ DIST llvmorg-12.0.0-rc2.tar.gz 134242619 BLAKE2B bb741a311db608fc2ba7eeaab71c5c9
 DIST llvmorg-12.0.0-rc3.tar.gz 134244008 BLAKE2B ed09aa361b264387711ba1ee2e4b01c0c78ad97391df95e2542d4edc31f657cc33c8a2a45de63eb421908d5dadd9392a736610fbb04b3ecbd336d6514a649da8 SHA512 1fae53c6f255160cf4be53848b8b92c8b162ddcfbddf1bf0017faf249859040c15c862c4b52bc3ba894149139afb814e0674da88793ddebfc0756ba3aa7626ce
 DIST llvmorg-12.0.0-rc4.tar.gz 134245842 BLAKE2B 860a0551a42e2c6a28f213c151076c5ae64a9d85f7bfb2e2df4737acd5fe968f29d368a689d9a857e01038587e872722d216f044b3f665857d7ed71122fe334e SHA512 20e4440664227c9ea7af84df3643599cd7c96f5e2b6404c42be0ce0f0d7f989f5c7b8df1f1ba93d1473d3a30325cda5a53d3900c0229ccb042b365583b5aa846
 DIST llvmorg-12.0.0-rc5.tar.gz 134247991 BLAKE2B 9721e211d39611f9c48b57386fb57c1dcf964c39ff5f32c593a6390c06659fcd5a1f76063004d2ecd3d1af32281a69994c7478b7fdfacd9f50ebf5fbb2050a71 SHA512 a289fdc55c25454e8cbfd370387fdd11c7555d03b3c479213e37dd01189c077d67bd04b8cab62ce82f3746877f5f02619afb3a5110191048511efee38c191d16
+DIST llvmorg-12.0.0.tar.gz 134226215 BLAKE2B f9c3ba8c58571855caa4f206fd285c9b5be66672fb0814cb8bc0964a051f57f5d35013aa1e27cbda502652b37df1ec23474129109e76a42066847860db441dbe SHA512 0cff02155c5ac0d6db2b72d60d9819d5b5dd859663b45f721b1c7540239c2fceb1f57d9173f6870c49de851c242ed8e85c5c6d6577a1f8092a7c5dcd12513b26
diff --git a/sys-devel/llvm/llvm-12.0.0.ebuild b/sys-devel/llvm/llvm-12.0.0.ebuild
new file mode 100644
index 000000000000..e6498e6d32c5
--- /dev/null
+++ b/sys-devel/llvm/llvm-12.0.0.ebuild
@@ -0,0 +1,525 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{7..9} )
+inherit cmake llvm.org multilib-minimal pax-utils python-any-r1 \
+	toolchain-funcs
+
+DESCRIPTION="Low Level Virtual Machine"
+HOMEPAGE="https://llvm.org/"
+
+# Those are in lib/Targets, without explicit CMakeLists.txt mention
+ALL_LLVM_EXPERIMENTAL_TARGETS=( ARC CSKY VE )
+# Keep in sync with CMakeLists.txt
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM AVR BPF Hexagon Lanai Mips MSP430
+	NVPTX PowerPC RISCV Sparc SystemZ WebAssembly X86 XCore
+	"${ALL_LLVM_EXPERIMENTAL_TARGETS[@]}" )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+
+# Additional licenses:
+# 1. OpenBSD regex: Henry Spencer's license ('rc' in Gentoo) + BSD.
+# 2. xxhash: BSD.
+# 3. MD5 code: public-domain.
+# 4. ConvertUTF.h: TODO.
+
+LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA BSD public-domain rc"
+SLOT="$(ver_cut 1)"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~riscv ~x86 ~amd64-linux ~ppc-macos ~x64-macos"
+IUSE="debug doc exegesis gold libedit +libffi ncurses test xar xml z3
+	kernel_Darwin ${ALL_LLVM_TARGETS[*]}"
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	sys-libs/zlib:0=[${MULTILIB_USEDEP}]
+	exegesis? ( dev-libs/libpfm:= )
+	gold? ( >=sys-devel/binutils-2.31.1-r4:*[plugins] )
+	libedit? ( dev-libs/libedit:0=[${MULTILIB_USEDEP}] )
+	libffi? ( >=dev-libs/libffi-3.0.13-r1:0=[${MULTILIB_USEDEP}] )
+	ncurses? ( >=sys-libs/ncurses-5.9-r3:0=[${MULTILIB_USEDEP}] )
+	xar? ( app-arch/xar )
+	xml? ( dev-libs/libxml2:2=[${MULTILIB_USEDEP}] )
+	z3? ( >=sci-mathematics/z3-4.7.1:0=[${MULTILIB_USEDEP}] )"
+DEPEND="${RDEPEND}
+	gold? ( sys-libs/binutils-libs )"
+BDEPEND="
+	dev-lang/perl
+	>=dev-util/cmake-3.16
+	sys-devel/gnuconfig
+	kernel_Darwin? (
+		<sys-libs/libcxx-$(ver_cut 1-3).9999
+		>=sys-devel/binutils-apple-5.1
+	)
+	doc? ( $(python_gen_any_dep '
+		dev-python/recommonmark[${PYTHON_USEDEP}]
+		dev-python/sphinx[${PYTHON_USEDEP}]
+	') )
+	libffi? ( virtual/pkgconfig )
+	${PYTHON_DEPS}"
+# There are no file collisions between these versions but having :0
+# installed means llvm-config there will take precedence.
+RDEPEND="${RDEPEND}
+	!sys-devel/llvm:0"
+PDEPEND="sys-devel/llvm-common
+	gold? ( >=sys-devel/llvmgold-${SLOT} )"
+
+LLVM_COMPONENTS=( llvm )
+LLVM_MANPAGES=pregenerated
+llvm.org_set_globals
+
+python_check_deps() {
+	use doc || return 0
+
+	has_version -b "dev-python/recommonmark[${PYTHON_USEDEP}]" &&
+	has_version -b "dev-python/sphinx[${PYTHON_USEDEP}]"
+}
+
+check_live_ebuild() {
+	local prod_targets=(
+		$(sed -n -e '/set(LLVM_ALL_TARGETS/,/)/p' CMakeLists.txt \
+			| tail -n +2 | head -n -1)
+	)
+	local all_targets=(
+		lib/Target/*/
+	)
+	all_targets=( "${all_targets[@]#lib/Target/}" )
+	all_targets=( "${all_targets[@]%/}" )
+
+	local exp_targets=() i
+	for i in "${all_targets[@]}"; do
+		has "${i}" "${prod_targets[@]}" || exp_targets+=( "${i}" )
+	done
+	# reorder
+	all_targets=( "${prod_targets[@]}" "${exp_targets[@]}" )
+
+	if [[ ${exp_targets[*]} != ${ALL_LLVM_EXPERIMENTAL_TARGETS[*]} ]]; then
+		eqawarn "ALL_LLVM_EXPERIMENTAL_TARGETS is outdated!"
+		eqawarn "    Have: ${ALL_LLVM_EXPERIMENTAL_TARGETS[*]}"
+		eqawarn "Expected: ${exp_targets[*]}"
+		eqawarn
+	fi
+
+	if [[ ${all_targets[*]} != ${ALL_LLVM_TARGETS[*]#llvm_targets_} ]]; then
+		eqawarn "ALL_LLVM_TARGETS is outdated!"
+		eqawarn "    Have: ${ALL_LLVM_TARGETS[*]#llvm_targets_}"
+		eqawarn "Expected: ${all_targets[*]}"
+	fi
+}
+
+check_distribution_components() {
+	if [[ ${CMAKE_MAKEFILE_GENERATOR} == ninja ]]; then
+		local all_targets=() my_targets=() l
+		cd "${BUILD_DIR}" || die
+
+		while read -r l; do
+			if [[ ${l} == install-*-stripped:* ]]; then
+				l=${l#install-}
+				l=${l%%-stripped*}
+
+				case ${l} in
+					# shared libs
+					LLVM|LLVMgold)
+						;;
+					# TableGen lib + deps
+					LLVMDemangle|LLVMSupport|LLVMTableGen)
+						;;
+					# static libs
+					LLVM*)
+						continue
+						;;
+					# meta-targets
+					distribution|llvm-libraries)
+						continue
+						;;
+					# used only w/ USE=doc
+					docs-llvm-html)
+						use doc || continue
+						;;
+				esac
+
+				all_targets+=( "${l}" )
+			fi
+		done < <(ninja -t targets all)
+
+		while read -r l; do
+			my_targets+=( "${l}" )
+		done < <(get_distribution_components $"\n")
+
+		local add=() remove=()
+		for l in "${all_targets[@]}"; do
+			if ! has "${l}" "${my_targets[@]}"; then
+				add+=( "${l}" )
+			fi
+		done
+		for l in "${my_targets[@]}"; do
+			if ! has "${l}" "${all_targets[@]}"; then
+				remove+=( "${l}" )
+			fi
+		done
+
+		if [[ ${#add[@]} -gt 0 || ${#remove[@]} -gt 0 ]]; then
+			eqawarn "get_distribution_components() is outdated!"
+			eqawarn "   Add: ${add[*]}"
+			eqawarn "Remove: ${remove[*]}"
+		fi
+		cd - >/dev/null || die
+	fi
+}
+
+src_prepare() {
+	# Fix llvm-config for shared linking and sane flags
+	# https://bugs.gentoo.org/show_bug.cgi?id=565358
+	eapply "${FILESDIR}"/9999/0007-llvm-config-Clean-up-exported-values-update-for-shar.patch
+
+	# Disable LBR tests that are broken on non-Intel CPUs
+	# https://bugs.llvm.org/show_bug.cgi?id=48918
+	rm -r test/tools/llvm-exegesis/X86/lbr || die
+
+	# disable use of SDK on OSX, bug #568758
+	sed -i -e 's/xcrun/false/' utils/lit/lit/util.py || die
+
+	# Update config.guess to support more systems
+	cp "${BROOT}/usr/share/gnuconfig/config.guess" cmake/ || die
+
+	# Verify that the live ebuild is up-to-date
+	check_live_ebuild
+
+	llvm.org_src_prepare
+}
+
+# Is LLVM being linked against libc++?
+is_libcxx_linked() {
+	local code='#include <ciso646>
+#if defined(_LIBCPP_VERSION)
+	HAVE_LIBCXX
+#endif
+'
+	local out=$($(tc-getCXX) ${CXXFLAGS} ${CPPFLAGS} -x c++ -E -P - <<<"${code}") || return 1
+
+	[[ ${out} == *HAVE_LIBCXX* ]]
+}
+
+get_distribution_components() {
+	local sep=${1-;}
+
+	local out=(
+		# shared libs
+		LLVM
+		LTO
+		Remarks
+
+		# tools
+		llvm-config
+
+		# common stuff
+		cmake-exports
+		llvm-headers
+
+		# libraries needed for clang-tblgen
+		LLVMDemangle
+		LLVMSupport
+		LLVMTableGen
+	)
+
+	if multilib_is_native_abi; then
+		out+=(
+			# utilities
+			llvm-tblgen
+			FileCheck
+			llvm-PerfectShuffle
+			count
+			not
+			yaml-bench
+
+			# tools
+			bugpoint
+			dsymutil
+			llc
+			lli
+			lli-child-target
+			llvm-addr2line
+			llvm-ar
+			llvm-as
+			llvm-bcanalyzer
+			llvm-bitcode-strip
+			llvm-c-test
+			llvm-cat
+			llvm-cfi-verify
+			llvm-config
+			llvm-cov
+			llvm-cvtres
+			llvm-cxxdump
+			llvm-cxxfilt
+			llvm-cxxmap
+			llvm-diff
+			llvm-dis
+			llvm-dlltool
+			llvm-dwarfdump
+			llvm-dwp
+			llvm-elfabi
+			llvm-exegesis
+			llvm-extract
+			llvm-gsymutil
+			llvm-ifs
+			llvm-install-name-tool
+			llvm-jitlink
+			llvm-jitlink-executor
+			llvm-lib
+			llvm-libtool-darwin
+			llvm-link
+			llvm-lipo
+			llvm-lto
+			llvm-lto2
+			llvm-mc
+			llvm-mca
+			llvm-ml
+			llvm-modextract
+			llvm-mt
+			llvm-nm
+			llvm-objcopy
+			llvm-objdump
+			llvm-opt-report
+			llvm-pdbutil
+			llvm-profdata
+			llvm-profgen
+			llvm-ranlib
+			llvm-rc
+			llvm-readelf
+			llvm-readobj
+			llvm-reduce
+			llvm-rtdyld
+			llvm-size
+			llvm-split
+			llvm-stress
+			llvm-strings
+			llvm-strip
+			llvm-symbolizer
+			llvm-undname
+			llvm-xray
+			obj2yaml
+			opt
+			sancov
+			sanstats
+			split-file
+			verify-uselistorder
+			yaml2obj
+
+			# python modules
+			opt-viewer
+		)
+
+		if llvm_are_manpages_built; then
+			out+=(
+				# manpages
+				docs-dsymutil-man
+				docs-llvm-dwarfdump-man
+				docs-llvm-man
+			)
+		fi
+		use doc && out+=(
+			docs-llvm-html
+		)
+
+		use gold && out+=(
+			LLVMgold
+		)
+	fi
+
+	printf "%s${sep}" "${out[@]}"
+}
+
+multilib_src_configure() {
+	local ffi_cflags ffi_ldflags
+	if use libffi; then
+		ffi_cflags=$($(tc-getPKG_CONFIG) --cflags-only-I libffi)
+		ffi_ldflags=$($(tc-getPKG_CONFIG) --libs-only-L libffi)
+	fi
+
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		# disable appending VCS revision to the version to improve
+		# direct cache hit ratio
+		-DLLVM_APPEND_VC_REV=OFF
+		-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/lib/llvm/${SLOT}"
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+
+		-DBUILD_SHARED_LIBS=OFF
+		-DLLVM_BUILD_LLVM_DYLIB=ON
+		-DLLVM_LINK_LLVM_DYLIB=ON
+		-DLLVM_DISTRIBUTION_COMPONENTS=$(get_distribution_components)
+
+		# cheap hack: LLVM combines both anyway, and the only difference
+		# is that the former list is explicitly verified at cmake time
+		-DLLVM_TARGETS_TO_BUILD=""
+		-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="${LLVM_TARGETS// /;}"
+		-DLLVM_BUILD_TESTS=$(usex test)
+
+		-DLLVM_ENABLE_FFI=$(usex libffi)
+		-DLLVM_ENABLE_LIBEDIT=$(usex libedit)
+		-DLLVM_ENABLE_TERMINFO=$(usex ncurses)
+		-DLLVM_ENABLE_LIBXML2=$(usex xml)
+		-DLLVM_ENABLE_ASSERTIONS=$(usex debug)
+		-DLLVM_ENABLE_LIBPFM=$(usex exegesis)
+		-DLLVM_ENABLE_EH=ON
+		-DLLVM_ENABLE_RTTI=ON
+		-DLLVM_ENABLE_Z3_SOLVER=$(usex z3)
+
+		-DLLVM_HOST_TRIPLE="${CHOST}"
+
+		-DFFI_INCLUDE_DIR="${ffi_cflags#-I}"
+		-DFFI_LIBRARY_DIR="${ffi_ldflags#-L}"
+		# used only for llvm-objdump tool
+		-DHAVE_LIBXAR=$(multilib_native_usex xar 1 0)
+
+		-DPython3_EXECUTABLE="${PYTHON}"
+
+		# disable OCaml bindings (now in dev-ml/llvm-ocaml)
+		-DOCAMLFIND=NO
+	)
+
+	if is_libcxx_linked; then
+		# Smart hack: alter version suffix -> SOVERSION when linking
+		# against libc++. This way we won't end up mixing LLVM libc++
+		# libraries with libstdc++ clang, and the other way around.
+		mycmakeargs+=(
+			-DLLVM_VERSION_SUFFIX="libcxx"
+			-DLLVM_ENABLE_LIBCXX=ON
+		)
+	fi
+
+#	Note: go bindings have no CMake rules at the moment
+#	but let's kill the check in case they are introduced
+#	if ! multilib_is_native_abi || ! use go; then
+		mycmakeargs+=(
+			-DGO_EXECUTABLE=GO_EXECUTABLE-NOTFOUND
+		)
+#	fi
+
+	use test && mycmakeargs+=(
+		-DLLVM_LIT_ARGS="$(get_lit_flags)"
+	)
+
+	if multilib_is_native_abi; then
+		local build_docs=OFF
+		if llvm_are_manpages_built; then
+			build_docs=ON
+			mycmakeargs+=(
+				-DCMAKE_INSTALL_MANDIR="${EPREFIX}/usr/lib/llvm/${SLOT}/share/man"
+				-DLLVM_INSTALL_SPHINX_HTML_DIR="${EPREFIX}/usr/share/doc/${PF}/html"
+				-DSPHINX_WARNINGS_AS_ERRORS=OFF
+			)
+		fi
+
+		mycmakeargs+=(
+			-DLLVM_BUILD_DOCS=${build_docs}
+			-DLLVM_ENABLE_OCAMLDOC=OFF
+			-DLLVM_ENABLE_SPHINX=${build_docs}
+			-DLLVM_ENABLE_DOXYGEN=OFF
+			-DLLVM_INSTALL_UTILS=ON
+		)
+		use gold && mycmakeargs+=(
+			-DLLVM_BINUTILS_INCDIR="${EPREFIX}"/usr/include
+		)
+	fi
+
+	if tc-is-cross-compiler; then
+		local tblgen="${EPREFIX}/usr/lib/llvm/${SLOT}/bin/llvm-tblgen"
+		[[ -x "${tblgen}" ]] \
+			|| die "${tblgen} not found or usable"
+		mycmakeargs+=(
+			-DCMAKE_CROSSCOMPILING=ON
+			-DLLVM_TABLEGEN="${tblgen}"
+		)
+	fi
+
+	# workaround BMI bug in gcc-7 (fixed in 7.4)
+	# https://bugs.gentoo.org/649880
+	# apply only to x86, https://bugs.gentoo.org/650506
+	if tc-is-gcc && [[ ${MULTILIB_ABI_FLAG} == abi_x86* ]] &&
+			[[ $(gcc-major-version) -eq 7 && $(gcc-minor-version) -lt 4 ]]
+	then
+		local CFLAGS="${CFLAGS} -mno-bmi"
+		local CXXFLAGS="${CXXFLAGS} -mno-bmi"
+	fi
+
+	# LLVM can have very high memory consumption while linking,
+	# exhausting the limit on 32-bit linker executable
+	use x86 && local -x LDFLAGS="${LDFLAGS} -Wl,--no-keep-memory"
+
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+	cmake_src_configure
+
+	multilib_is_native_abi && check_distribution_components
+}
+
+multilib_src_compile() {
+	cmake_build distribution
+
+	pax-mark m "${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 "${BUILD_DIR}"/unittests/Support/SupportTests
+	fi
+}
+
+multilib_src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check
+}
+
+src_install() {
+	local MULTILIB_CHOST_TOOLS=(
+		/usr/lib/llvm/${SLOT}/bin/llvm-config
+	)
+
+	local MULTILIB_WRAPPED_HEADERS=(
+		/usr/include/llvm/Config/llvm-config.h
+	)
+
+	local LLVM_LDPATHS=()
+	multilib-minimal_src_install
+
+	# move wrapped headers back
+	mv "${ED}"/usr/include "${ED}"/usr/lib/llvm/${SLOT}/include || die
+}
+
+multilib_src_install() {
+	DESTDIR=${D} cmake_build install-distribution
+
+	# move headers to /usr/include for wrapping
+	rm -rf "${ED}"/usr/include || die
+	mv "${ED}"/usr/lib/llvm/${SLOT}/include "${ED}"/usr/include || die
+
+	LLVM_LDPATHS+=( "${EPREFIX}/usr/lib/llvm/${SLOT}/$(get_libdir)" )
+}
+
+multilib_src_install_all() {
+	local revord=$(( 9999 - ${SLOT} ))
+	newenvd - "60llvm-${revord}" <<-_EOF_
+		PATH="${EPREFIX}/usr/lib/llvm/${SLOT}/bin"
+		# we need to duplicate it in ROOTPATH for Portage to respect...
+		ROOTPATH="${EPREFIX}/usr/lib/llvm/${SLOT}/bin"
+		MANPATH="${EPREFIX}/usr/lib/llvm/${SLOT}/share/man"
+		LDPATH="$( IFS=:; echo "${LLVM_LDPATHS[*]}" )"
+	_EOF_
+
+	docompress "/usr/lib/llvm/${SLOT}/share/man"
+	llvm_install_manpages
+}
+
+pkg_postinst() {
+	elog "You can find additional opt-viewer utility scripts in:"
+	elog "  ${EROOT}/usr/lib/llvm/${SLOT}/share/opt-viewer"
+	elog "To use these scripts, you will need Python along with the following"
+	elog "packages:"
+	elog "  dev-python/pygments (for opt-viewer)"
+	elog "  dev-python/pyyaml (for all of them)"
+}