15 files changed, 1008 insertions, 2 deletions
diff --git a/sys-libs/Manifest.gz b/sys-libs/Manifest.gz
index c83040a64e5a..791fb70e6f7f 100644
--- a/sys-libs/Manifest.gz
+++ b/sys-libs/Manifest.gz
diff --git a/sys-libs/compiler-rt-sanitizers/Manifest b/sys-libs/compiler-rt-sanitizers/Manifest
index 8a93b8fe6868..960d07d9da1d 100644
--- a/sys-libs/compiler-rt-sanitizers/Manifest
+++ b/sys-libs/compiler-rt-sanitizers/Manifest
@@ -1,11 +1,15 @@
 DIST llvm-gentoo-patchset-13.0.1.tar.xz 6288 BLAKE2B 899222b962486e924e4f8a2b574d285531a3f87af9385ff68c81db92aa224a0cde6d4ee049b5405056bedb4b232b50e1d5840024071a4a215f6311853304c92d SHA512 b2805337f1deca626768a44c5e7ac9ed16e0c31bead1647d44a493a8123c1b8e8f1c8ceee3536bcc6fa87fdd3fcec408229f701adf30eff07e7ef9889b847b01
 DIST llvm-gentoo-patchset-14.0.6-r3.tar.xz 16904 BLAKE2B ebf67455071d6d3744cfc0491b8a33c4c63bfdbcf668565fa0718f6cdb01bced53be9d1cdf6774f6cd8427c07c0ede69503d74cf3574642a6967b38730248ebb SHA512 adc5a3212657d1defa7b720d1a7e9e91586439a34964d44b6897d21be3d208bd15c04bf20502dd7125ef8c368defaeea146eb844ca321be56eebcee52be606a9
+DIST llvm-gentoo-patchset-15.0.0-rc2.tar.xz 5768 BLAKE2B 03822c4dfbe3157d9131a3524beeda22fbc6adc937af052fd0fbcc23fb6ea86e1a5e015c316b53019820de5b81b1b065bfcbc31608598307f03af39f215fb12e SHA512 b9d7adb9b738a565c2142360c5ff7a7aa8405ce78af8767867203dd003e5bdb2b8a7f14179fdb7dc0c5cdc696cfff55c4886cfcd0894672284b453943e4e7269
 DIST llvm-gentoo-patchset-9999-1.tar.xz 4032 BLAKE2B b9413484dafed8ae0c68c2c164b45fd07bb8d5d0898f03abe118fd2120ffcb1fb6c949de9649a97c2e8105f24b9d131a725c67c0a502ca4d4d192c1a0d65f49d SHA512 e64449eeaf756c5bd945109937b84ba4bd8a015222bd792d39cf3947871e87571a4ca57814790e51544cb05ad4c2d1f044e818e4caaac7c2e2a02cb1aa290fcc
 DIST llvm-project-14.0.6.src.tar.xz 105618228 BLAKE2B ee67c5407df8cef493b9c0004f15e428f22a536a17e5f4e3eb29a003b8a8ec0abe0fa3e072591161d5f30ef7d8867c1ce34d1b341ad858e93c00263499941a99 SHA512 6fc6eeb60fac698702d1aac495fc0161eb7216a1f8db2020af8fccec5837831f7cc20dc2a169bf4f0b5f520748280b4a86621f3697d622aa58faaa45dbfaad13
 DIST llvm-project-14.0.6.src.tar.xz.sig 566 BLAKE2B cb658ad43d8ab6c43a5773aedadf0569c97b5ee4b1bd58eceb10e1879a30880c741c3d66bedd462c892309b688fb7b2673115a62d1f74d71ee375a578de9547f SHA512 b4a7b368532a7a4a24376cfa7db8f6d3478f6d4446474342fc00b474ecf466330cd0f16783209263c4c72d5fc7ddedfb11b95578842e700cfb7ee0bb34cc95d6
+DIST llvm-project-15.0.0rc2.src.tar.xz 112110968 BLAKE2B 98c3769f17f1958fbec771409eef781f5ca845363656c70fe5cd20bca1b8471e7a8773a7d4e395700c297a5f3f208fe1303cf18e2a73b45388b782fb7484106b SHA512 eee1bee1f83cc468fb4bb6839acbd5c1618dc35f35e51cd078288b91bad95d52edaadd05c88f2d72d51c1c338ba08b3346c070a28693b1224639eb7a1ef4a4d9
+DIST llvm-project-15.0.0rc2.src.tar.xz.sig 438 BLAKE2B 09f260b30724b41b27ef621929c086fd6c13bde51c4adb880897b549b2d336682f617faf3dd636ceb795e329b664972cf50745ab49f84e7540658d53074510da SHA512 9f695a309fbb15026dc133eb17d33abd26831eb036fad79dd8df37d4f4d9eeae1ca463acd037d2a1882bc2cff763e4bda507d1d827d845613bfd62d0f9fbd4ca
 DIST llvmorg-13.0.1.tar.gz 147290251 BLAKE2B 2a44b012a672501761d0c27c6b3a315b69bfef0cd13b078a7e7d2fccc4a9c8c0f2bee0f164c4271c9106b0a99cb06e8b64986f66253b613336719fb86b82541b SHA512 9a8cb5d11964ba88b7624f19ec861fb28701f23956ea3c92f6ac644332d5f41fde97bd8933dd3ee70ed378058c252fa3a3887c8d1af90d219970c2b27691166f
 EBUILD compiler-rt-sanitizers-13.0.1.ebuild 6337 BLAKE2B 67f5e39af19ab6e4dccb2989d044a1f148a7e3cafd7134ea7ccdc75481416158613137e3cc7204d32b3c868d00e5047c9d378f09814b8fc1e46ad876d5214423 SHA512 c49b998f5f990103e53253f22f19313e3b8e884818bdc5b651ee976957f8fa10d36ce6146b1db65336c60e4f22f67c435c5841e0f8cea48901724790d3c6738f
 EBUILD compiler-rt-sanitizers-14.0.6.ebuild 6349 BLAKE2B b4a180561b4aa22cf1af576e87a97513af4f6f5aebdf133aa39864697ef5b116b37066d115b4fd396132830127425884b3f009baf77276733ea85df76ec37008 SHA512 26220a0202faecae61933fa53a8f8c443989e0deb4b412ca7303d31a8c50aef0530802862e30f59d105136a8f38f6b55b7ffca6f33f24878cbcb798e3e17129c
 EBUILD compiler-rt-sanitizers-15.0.0.9999.ebuild 6292 BLAKE2B a0cb8f93777efbe56af67b5c79d187bfe2dfedfdbbe4bac3eaf921c7e1e7f307e6cefe5fd00afa799cda93d0538ad313009544d20182accf4a35895948bebd62 SHA512 9782e162eb492c0a03555a671ed1bea614304359afbb6a04a4f6232c1ab0f3c796e5e617e032f9213e0f430a6871a05adc1616f3aaed1e57424b8916466d85f9
+EBUILD compiler-rt-sanitizers-15.0.0_rc2.ebuild 6295 BLAKE2B 484585cdcfead216926cf70c38b35f1253bbdd69e27ee56bd62a489b8abf89c8415037f91195e7e2658fef8192374065da6b87bb1c25d75bb8ac207721f2da84 SHA512 7ec8c1747aa918d0b947745b07976b35f8dce8e8686a665a1baeb1ff0280e528db3cf694d972df18d612c480628d732c13058c28f2263b9945ee8e23a059b4cf
 EBUILD compiler-rt-sanitizers-16.0.0.9999.ebuild 6292 BLAKE2B a0cb8f93777efbe56af67b5c79d187bfe2dfedfdbbe4bac3eaf921c7e1e7f307e6cefe5fd00afa799cda93d0538ad313009544d20182accf4a35895948bebd62 SHA512 9782e162eb492c0a03555a671ed1bea614304359afbb6a04a4f6232c1ab0f3c796e5e617e032f9213e0f430a6871a05adc1616f3aaed1e57424b8916466d85f9
 MISC metadata.xml 1412 BLAKE2B 75675507000fa6a6b8182e6b45a08a2716ae7fb9a7e3428dc8420464e4c1d1bdb5bea62cc2f553c579de5a4faa752b35cb3529d980fb07a055ff4ddf6e752707 SHA512 f05ea5168b923db72f4f5b53e9b748ebbcdae9eff09d86323313055933b47fc0089e1b2d73cd997d73dcfb2dca032344955816425fbddc09d27ca751463aadbb
diff --git a/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-15.0.0_rc2.ebuild b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-15.0.0_rc2.ebuild
new file mode 100644
index 000000000000..ddcda06e3401
--- /dev/null
+++ b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-15.0.0_rc2.ebuild
@@ -0,0 +1,221 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{8..11} )
+inherit check-reqs cmake flag-o-matic llvm llvm.org python-any-r1
+
+DESCRIPTION="Compiler runtime libraries for clang (sanitizers & xray)"
+HOMEPAGE="https://llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="$(ver_cut 1-3)"
+KEYWORDS=""
+IUSE="+abi_x86_32 abi_x86_64 +clang debug test"
+# base targets
+IUSE+=" +libfuzzer +memprof +orc +profile +xray"
+# sanitizer targets, keep in sync with config-ix.cmake
+# NB: ubsan, scudo deliberately match two entries
+SANITIZER_FLAGS=(
+	asan dfsan lsan msan hwasan tsan ubsan safestack cfi scudo
+	shadowcallstack gwp-asan
+)
+IUSE+=" ${SANITIZER_FLAGS[@]/#/+}"
+REQUIRED_USE="
+	|| ( ${SANITIZER_FLAGS[*]} libfuzzer orc profile xray )
+	test? (
+		cfi? ( ubsan )
+		gwp-asan? ( scudo )
+	)
+"
+RESTRICT="
+	!clang? ( test )
+	!test? ( test )
+"
+
+CLANG_SLOT=${SLOT%%.*}
+# llvm-6 for new lit options
+DEPEND="
+	>=sys-devel/llvm-6
+	virtual/libcrypt[abi_x86_32(-)?,abi_x86_64(-)?]
+"
+BDEPEND="
+	>=dev-util/cmake-3.16
+	clang? ( sys-devel/clang )
+	elibc_glibc? ( net-libs/libtirpc )
+	test? (
+		!<sys-apps/sandbox-2.13
+		$(python_gen_any_dep ">=dev-python/lit-15[\${PYTHON_USEDEP}]")
+		=sys-devel/clang-${PV%_*}*:${CLANG_SLOT}
+		sys-libs/compiler-rt:${SLOT}
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+"
+
+LLVM_COMPONENTS=( compiler-rt cmake llvm/cmake )
+LLVM_TEST_COMPONENTS=( llvm/lib/Testing/Support llvm/utils/unittest )
+LLVM_PATCHSET=${PV/_/-}
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+check_space() {
+	if use test; then
+		local CHECKREQS_DISK_BUILD=11G
+		check-reqs_pkg_pretend
+	fi
+}
+
+pkg_pretend() {
+	check_space
+}
+
+pkg_setup() {
+	check_space
+	llvm_pkg_setup
+	python-any-r1_pkg_setup
+}
+
+src_prepare() {
+	sed -i -e 's:-Werror::' lib/tsan/go/buildgo.sh || die
+
+	local flag
+	for flag in "${SANITIZER_FLAGS[@]}"; do
+		if ! use "${flag}"; then
+			local cmake_flag=${flag/-/_}
+			sed -i -e "/COMPILER_RT_HAS_${cmake_flag^^}/s:TRUE:FALSE:" \
+				cmake/config-ix.cmake || die
+		fi
+	done
+
+	# TODO: fix these tests to be skipped upstream
+	if use asan && ! use profile; then
+		rm test/asan/TestCases/asan_and_llvm_coverage_test.cpp || die
+	fi
+	if use ubsan && ! use cfi; then
+		> test/cfi/CMakeLists.txt || die
+	fi
+
+	llvm.org_src_prepare
+}
+
+src_configure() {
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+
+	# pre-set since we need to pass it to cmake
+	BUILD_DIR=${WORKDIR}/compiler-rt_build
+
+	if use clang; then
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	local flag want_sanitizer=OFF
+	for flag in "${SANITIZER_FLAGS[@]}"; do
+		if use "${flag}"; then
+			want_sanitizer=ON
+			break
+		fi
+	done
+
+	local mycmakeargs=(
+		-DCOMPILER_RT_INSTALL_PATH="${EPREFIX}/usr/lib/clang/${SLOT}"
+		# use a build dir structure consistent with install
+		# this makes it possible to easily deploy test-friendly clang
+		-DCOMPILER_RT_OUTPUT_DIR="${BUILD_DIR}/lib/clang/${SLOT}"
+
+		-DCOMPILER_RT_INCLUDE_TESTS=$(usex test)
+		# builtins & crt installed by sys-libs/compiler-rt
+		-DCOMPILER_RT_BUILD_BUILTINS=OFF
+		-DCOMPILER_RT_BUILD_CRT=OFF
+		-DCOMPILER_RT_BUILD_LIBFUZZER=$(usex libfuzzer)
+		-DCOMPILER_RT_BUILD_MEMPROF=$(usex memprof)
+		-DCOMPILER_RT_BUILD_ORC=$(usex orc)
+		-DCOMPILER_RT_BUILD_PROFILE=$(usex profile)
+		-DCOMPILER_RT_BUILD_SANITIZERS="${want_sanitizer}"
+		-DCOMPILER_RT_BUILD_XRAY=$(usex xray)
+
+		-DPython3_EXECUTABLE="${PYTHON}"
+	)
+
+	if use amd64; then
+		mycmakeargs+=(
+			-DCAN_TARGET_i386=$(usex abi_x86_32)
+			-DCAN_TARGET_x86_64=$(usex abi_x86_64)
+		)
+	fi
+
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_MAIN_SRC_DIR="${WORKDIR}/llvm"
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+
+			# they are created during src_test()
+			-DCOMPILER_RT_TEST_COMPILER="${BUILD_DIR}/lib/llvm/${CLANG_SLOT}/bin/clang"
+			-DCOMPILER_RT_TEST_CXX_COMPILER="${BUILD_DIR}/lib/llvm/${CLANG_SLOT}/bin/clang++"
+		)
+
+		# same flags are passed for build & tests, so we need to strip
+		# them down to a subset supported by clang
+		CC=${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang \
+		CXX=${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang++ \
+		strip-unsupported-flags
+	fi
+
+	if use prefix && [[ "${CHOST}" == *-darwin* ]] ; then
+		mycmakeargs+=(
+			# setting -isysroot is disabled with compiler-rt-prefix-paths.patch
+			# this allows adding arm64 support using SDK in EPREFIX
+			-DDARWIN_macosx_CACHED_SYSROOT="${EPREFIX}/MacOSX.sdk"
+			# Set version based on the SDK in EPREFIX
+			# This disables i386 for SDK >= 10.15
+			# Will error if has_use tsan and SDK < 10.12
+			-DDARWIN_macosx_OVERRIDE_SDK_VERSION="$(realpath ${EPREFIX}/MacOSX.sdk | sed -e 's/.*MacOSX\(.*\)\.sdk/\1/')"
+			# Use our libtool instead of looking it up with xcrun
+			-DCMAKE_LIBTOOL="${EPREFIX}/usr/bin/${CHOST}-libtool"
+		)
+	fi
+
+	cmake_src_configure
+
+	if use test; then
+		local sys_dir=( "${EPREFIX}"/usr/lib/clang/${SLOT}/lib/* )
+		[[ -e ${sys_dir} ]] || die "Unable to find ${sys_dir}"
+		[[ ${#sys_dir[@]} -eq 1 ]] || die "Non-deterministic compiler-rt install: ${sys_dir[*]}"
+
+		# copy clang over since resource_dir is located relatively to binary
+		# therefore, we can put our new libraries in it
+		mkdir -p "${BUILD_DIR}"/lib/{llvm/${CLANG_SLOT}/{bin,$(get_libdir)},clang/${SLOT}/include} || die
+		cp "${EPREFIX}"/usr/lib/llvm/${CLANG_SLOT}/bin/clang{,++} \
+			"${BUILD_DIR}"/lib/llvm/${CLANG_SLOT}/bin/ || die
+		cp "${EPREFIX}"/usr/lib/clang/${SLOT}/include/*.h \
+			"${BUILD_DIR}"/lib/clang/${SLOT}/include/ || die
+		cp "${sys_dir}"/*builtins*.a \
+			"${BUILD_DIR}/lib/clang/${SLOT}/lib/${sys_dir##*/}/" || die
+		# we also need LLVMgold.so for gold-based tests
+		if [[ -f ${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/$(get_libdir)/LLVMgold.so ]]; then
+			ln -s "${EPREFIX}"/usr/lib/llvm/${CLANG_SLOT}/$(get_libdir)/LLVMgold.so \
+				"${BUILD_DIR}"/lib/llvm/${CLANG_SLOT}/$(get_libdir)/ || die
+		fi
+	fi
+}
+
+src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	# disable sandbox to have it stop clobbering LD_PRELOAD
+	local -x SANDBOX_ON=0
+	# wipe LD_PRELOAD to make ASAN happy
+	local -x LD_PRELOAD=
+
+	cmake_build check-all
+}
diff --git a/sys-libs/compiler-rt/Manifest b/sys-libs/compiler-rt/Manifest
index a45f6a29f595..f091adb506a0 100644
--- a/sys-libs/compiler-rt/Manifest
+++ b/sys-libs/compiler-rt/Manifest
@@ -1,12 +1,16 @@
 DIST llvm-gentoo-patchset-13.0.1.tar.xz 6288 BLAKE2B 899222b962486e924e4f8a2b574d285531a3f87af9385ff68c81db92aa224a0cde6d4ee049b5405056bedb4b232b50e1d5840024071a4a215f6311853304c92d SHA512 b2805337f1deca626768a44c5e7ac9ed16e0c31bead1647d44a493a8123c1b8e8f1c8ceee3536bcc6fa87fdd3fcec408229f701adf30eff07e7ef9889b847b01
 DIST llvm-gentoo-patchset-14.0.6-r2.tar.xz 16120 BLAKE2B e12e522fdb7ba505693c679cb09cc8e00e6a954df195c86c2af4dbf1b68334a405b8dcc45f2e28b5e5e0b7e9d5eb7ba907337027927371b7a3b7784ff8aae7e0 SHA512 8a5ea71c30fc0727cc855dd812bbcb6d5f51c80c98eb3d5b80258d5c5eaab1310edc9d53ae63c2ca827abec68e2912c4b69ef0da351ff883fb30545a61e1d09c
+DIST llvm-gentoo-patchset-15.0.0-rc2.tar.xz 5768 BLAKE2B 03822c4dfbe3157d9131a3524beeda22fbc6adc937af052fd0fbcc23fb6ea86e1a5e015c316b53019820de5b81b1b065bfcbc31608598307f03af39f215fb12e SHA512 b9d7adb9b738a565c2142360c5ff7a7aa8405ce78af8767867203dd003e5bdb2b8a7f14179fdb7dc0c5cdc696cfff55c4886cfcd0894672284b453943e4e7269
 DIST llvm-gentoo-patchset-9999-1.tar.xz 4032 BLAKE2B b9413484dafed8ae0c68c2c164b45fd07bb8d5d0898f03abe118fd2120ffcb1fb6c949de9649a97c2e8105f24b9d131a725c67c0a502ca4d4d192c1a0d65f49d SHA512 e64449eeaf756c5bd945109937b84ba4bd8a015222bd792d39cf3947871e87571a4ca57814790e51544cb05ad4c2d1f044e818e4caaac7c2e2a02cb1aa290fcc
 DIST llvm-project-14.0.6.src.tar.xz 105618228 BLAKE2B ee67c5407df8cef493b9c0004f15e428f22a536a17e5f4e3eb29a003b8a8ec0abe0fa3e072591161d5f30ef7d8867c1ce34d1b341ad858e93c00263499941a99 SHA512 6fc6eeb60fac698702d1aac495fc0161eb7216a1f8db2020af8fccec5837831f7cc20dc2a169bf4f0b5f520748280b4a86621f3697d622aa58faaa45dbfaad13
 DIST llvm-project-14.0.6.src.tar.xz.sig 566 BLAKE2B cb658ad43d8ab6c43a5773aedadf0569c97b5ee4b1bd58eceb10e1879a30880c741c3d66bedd462c892309b688fb7b2673115a62d1f74d71ee375a578de9547f SHA512 b4a7b368532a7a4a24376cfa7db8f6d3478f6d4446474342fc00b474ecf466330cd0f16783209263c4c72d5fc7ddedfb11b95578842e700cfb7ee0bb34cc95d6
+DIST llvm-project-15.0.0rc2.src.tar.xz 112110968 BLAKE2B 98c3769f17f1958fbec771409eef781f5ca845363656c70fe5cd20bca1b8471e7a8773a7d4e395700c297a5f3f208fe1303cf18e2a73b45388b782fb7484106b SHA512 eee1bee1f83cc468fb4bb6839acbd5c1618dc35f35e51cd078288b91bad95d52edaadd05c88f2d72d51c1c338ba08b3346c070a28693b1224639eb7a1ef4a4d9
+DIST llvm-project-15.0.0rc2.src.tar.xz.sig 438 BLAKE2B 09f260b30724b41b27ef621929c086fd6c13bde51c4adb880897b549b2d336682f617faf3dd636ceb795e329b664972cf50745ab49f84e7540658d53074510da SHA512 9f695a309fbb15026dc133eb17d33abd26831eb036fad79dd8df37d4f4d9eeae1ca463acd037d2a1882bc2cff763e4bda507d1d827d845613bfd62d0f9fbd4ca
 DIST llvmorg-13.0.1.tar.gz 147290251 BLAKE2B 2a44b012a672501761d0c27c6b3a315b69bfef0cd13b078a7e7d2fccc4a9c8c0f2bee0f164c4271c9106b0a99cb06e8b64986f66253b613336719fb86b82541b SHA512 9a8cb5d11964ba88b7624f19ec861fb28701f23956ea3c92f6ac644332d5f41fde97bd8933dd3ee70ed378058c252fa3a3887c8d1af90d219970c2b27691166f
 EBUILD compiler-rt-13.0.1.ebuild 3868 BLAKE2B b2b643b850023513b69076bc791b22b74aa54445250cba334a2d3dfdc26a1ea11d30d1ce9df6cb2d1c813b66eaa59a130821470b3a3076237f9ef93d2919a124 SHA512 334a2609ae6882dbbb9caca5bb3bc7ba0a668f9a8f337570d54bde926d7ebfaa87fe4e53dddc73ea602b2d52e7537b9490f8936736480f1ddac6c9caf7b6832d
 EBUILD compiler-rt-14.0.6-r1.ebuild 4179 BLAKE2B 1fe649044872b312da697df9a88217c323ced9dff0283932f6a0210b3e97a86cce59a37a1e678f45ff16c93f5647d6150ffb963303a3390a6eeb372fcd587a3d SHA512 2182681a27d944378e39cc5283d46c4a94da3b8b3a9fc18d5c38c6f00e92a1b1dc7cc945bd3dc71b6471b24a1ce769d6f17f84a5452e0f4b2bf1c7c670cbaa1c
 EBUILD compiler-rt-14.0.6.ebuild 4019 BLAKE2B f97793688c6e2dd3f2874217813ee9759bb896e192e146a2bc17e97daa0d9f8d8708938c68ab1270ef9dc49eb52bb7c29b4edd94382993e8de0a73f006238d23 SHA512 73a150cb917587e1e9a0adc499ae6cb1d473e455400b1b19777b30dea72846f01114bc52018dda7ff7090ea43b365793ad5a3515e4601dbd9ba4226c62322c77
 EBUILD compiler-rt-15.0.0.9999.ebuild 4113 BLAKE2B 58ae13f048e6b4749815cc75eaab2d0bdf0ecc55703c6699eea4cea239ce0969b60d109e56e9975fd1c33a11db09554e3195c3fe164b37af62c95de1dd001471 SHA512 bcf661838b113330870526950bbcefc83e9eb00b874c314706881b9c279638502986d881a7d025c34eeccb8379951d480996ee82b1c184f726b6ce2dba529829
+EBUILD compiler-rt-15.0.0_rc2.ebuild 4116 BLAKE2B 7a5640ca077df1e9c792172d649061d15b4d484fa22a77ece762b1a18b09be5888df794005b88d62c46204b78a436fac32bc0e9aa30b1527ae95aeed4aac432d SHA512 07f72d7dcc4ebee3b748c406b5a8a07cabaca1d99321b9fa088341336626f568a628cb397e03faa77c5cf7896711ac6df514580a62771dc8bc0f94f444818627
 EBUILD compiler-rt-16.0.0.9999.ebuild 4113 BLAKE2B 58ae13f048e6b4749815cc75eaab2d0bdf0ecc55703c6699eea4cea239ce0969b60d109e56e9975fd1c33a11db09554e3195c3fe164b37af62c95de1dd001471 SHA512 bcf661838b113330870526950bbcefc83e9eb00b874c314706881b9c279638502986d881a7d025c34eeccb8379951d480996ee82b1c184f726b6ce2dba529829
 MISC metadata.xml 416 BLAKE2B 79a58249c94b605ba57f346c4e05b43853cf6cfb8bb65a4f4e3c44039cccfdb83dd31bfaaaf398bcbdc393efabdfc7ed186fe775976c46227e74decf2c8f4fb2 SHA512 ce30c79a575e5933effb1fec36f9a4ef02d9f97f312feb39c55a88cbda9a1bae1d7af2ec4ad5f66212cbb2cdbfb26f1a436689f16f410153c9d65eb010264c48
diff --git a/sys-libs/compiler-rt/compiler-rt-15.0.0_rc2.ebuild b/sys-libs/compiler-rt/compiler-rt-15.0.0_rc2.ebuild
new file mode 100644
index 000000000000..15ea5aaaa3f2
--- /dev/null
+++ b/sys-libs/compiler-rt/compiler-rt-15.0.0_rc2.ebuild
@@ -0,0 +1,150 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{8..11} )
+inherit cmake flag-o-matic llvm llvm.org python-any-r1 toolchain-funcs
+
+DESCRIPTION="Compiler runtime library for clang (built-in part)"
+HOMEPAGE="https://llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="$(ver_cut 1-3)"
+KEYWORDS=""
+IUSE="+abi_x86_32 abi_x86_64 +clang debug test"
+RESTRICT="!test? ( test ) !clang? ( test )"
+
+CLANG_SLOT=${SLOT%%.*}
+# llvm-6 for new lit options
+DEPEND="
+	>=sys-devel/llvm-6
+"
+BDEPEND="
+	>=dev-util/cmake-3.16
+	clang? ( sys-devel/clang )
+	test? (
+		$(python_gen_any_dep ">=dev-python/lit-15[\${PYTHON_USEDEP}]")
+		=sys-devel/clang-${PV%_*}*:${CLANG_SLOT}
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+"
+
+LLVM_COMPONENTS=( compiler-rt cmake llvm/cmake )
+LLVM_PATCHSET=${PV/_/-}
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+pkg_pretend() {
+	if ! use clang && ! tc-is-clang; then
+		ewarn "Building using a compiler other than clang may result in broken atomics"
+		ewarn "library. Enable USE=clang unless you have a very good reason not to."
+	fi
+}
+
+pkg_setup() {
+	# Darwin Prefix builds do not have llvm installed yet, so rely on
+	# bootstrap-prefix to set the appropriate path vars to LLVM instead
+	# of using llvm_pkg_setup.
+	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
+		llvm_pkg_setup
+	fi
+	python-any-r1_pkg_setup
+}
+
+test_compiler() {
+	$(tc-getCC) ${CFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c - \
+		<<<'int main() { return 0; }' &>/dev/null
+}
+
+src_configure() {
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+
+	# pre-set since we need to pass it to cmake
+	BUILD_DIR=${WORKDIR}/${P}_build
+
+	if use clang; then
+		# Only do this conditionally to allow overriding with
+		# e.g. CC=clang-13 in case of breakage
+		if ! tc-is-clang ; then
+			local -x CC=${CHOST}-clang
+			local -x CXX=${CHOST}-clang++
+		fi
+
+		strip-unsupported-flags
+	fi
+
+	if ! test_compiler; then
+		local nolib_flags=( -nodefaultlibs -lc )
+
+		if test_compiler "${nolib_flags[@]}"; then
+			local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
+			ewarn "${CC} seems to lack runtime, trying with ${nolib_flags[*]}"
+		elif test_compiler "${nolib_flags[@]}" -nostartfiles; then
+			# Avoiding -nostartfiles earlier on for bug #862540
+			nolib_flags+=( -nostartfiles )
+			local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
+			ewarn "${CC} seems to lack runtime, trying with ${nolib_flags[*]}"
+		fi
+	fi
+
+	local mycmakeargs=(
+		-DCOMPILER_RT_INSTALL_PATH="${EPREFIX}/usr/lib/clang/${SLOT}"
+
+		-DCOMPILER_RT_INCLUDE_TESTS=$(usex test)
+		-DCOMPILER_RT_BUILD_LIBFUZZER=OFF
+		-DCOMPILER_RT_BUILD_MEMPROF=OFF
+		-DCOMPILER_RT_BUILD_ORC=OFF
+		-DCOMPILER_RT_BUILD_PROFILE=OFF
+		-DCOMPILER_RT_BUILD_SANITIZERS=OFF
+		-DCOMPILER_RT_BUILD_XRAY=OFF
+
+		-DPython3_EXECUTABLE="${PYTHON}"
+	)
+
+	if use amd64; then
+		mycmakeargs+=(
+			-DCAN_TARGET_i386=$(usex abi_x86_32)
+			-DCAN_TARGET_x86_64=$(usex abi_x86_64)
+		)
+	fi
+
+	if use prefix && [[ "${CHOST}" == *-darwin* ]] ; then
+		mycmakeargs+=(
+			# setting -isysroot is disabled with compiler-rt-prefix-paths.patch
+			# this allows adding arm64 support using SDK in EPREFIX
+			-DDARWIN_macosx_CACHED_SYSROOT="${EPREFIX}/MacOSX.sdk"
+			# Set version based on the SDK in EPREFIX.
+			# This disables i386 for SDK >= 10.15
+			-DDARWIN_macosx_OVERRIDE_SDK_VERSION="$(realpath ${EPREFIX}/MacOSX.sdk | sed -e 's/.*MacOSX\(.*\)\.sdk/\1/')"
+			# Use our libtool instead of looking it up with xcrun
+			-DCMAKE_LIBTOOL="${EPREFIX}/usr/bin/${CHOST}-libtool"
+		)
+	fi
+
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+
+			-DCOMPILER_RT_TEST_COMPILER="${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang"
+			-DCOMPILER_RT_TEST_CXX_COMPILER="${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang++"
+		)
+	fi
+
+	cmake_src_configure
+}
+
+src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+
+	cmake_build check-builtins
+}
diff --git a/sys-libs/libcxx/Manifest b/sys-libs/libcxx/Manifest
index d84ce979e8a3..12c6f479036a 100644
--- a/sys-libs/libcxx/Manifest
+++ b/sys-libs/libcxx/Manifest
@@ -1,11 +1,15 @@
 DIST llvm-gentoo-patchset-13.0.1.tar.xz 6288 BLAKE2B 899222b962486e924e4f8a2b574d285531a3f87af9385ff68c81db92aa224a0cde6d4ee049b5405056bedb4b232b50e1d5840024071a4a215f6311853304c92d SHA512 b2805337f1deca626768a44c5e7ac9ed16e0c31bead1647d44a493a8123c1b8e8f1c8ceee3536bcc6fa87fdd3fcec408229f701adf30eff07e7ef9889b847b01
 DIST llvm-gentoo-patchset-14.0.6-r2.tar.xz 16120 BLAKE2B e12e522fdb7ba505693c679cb09cc8e00e6a954df195c86c2af4dbf1b68334a405b8dcc45f2e28b5e5e0b7e9d5eb7ba907337027927371b7a3b7784ff8aae7e0 SHA512 8a5ea71c30fc0727cc855dd812bbcb6d5f51c80c98eb3d5b80258d5c5eaab1310edc9d53ae63c2ca827abec68e2912c4b69ef0da351ff883fb30545a61e1d09c
+DIST llvm-gentoo-patchset-15.0.0-rc2.tar.xz 5768 BLAKE2B 03822c4dfbe3157d9131a3524beeda22fbc6adc937af052fd0fbcc23fb6ea86e1a5e015c316b53019820de5b81b1b065bfcbc31608598307f03af39f215fb12e SHA512 b9d7adb9b738a565c2142360c5ff7a7aa8405ce78af8767867203dd003e5bdb2b8a7f14179fdb7dc0c5cdc696cfff55c4886cfcd0894672284b453943e4e7269
 DIST llvm-gentoo-patchset-9999-1.tar.xz 4032 BLAKE2B b9413484dafed8ae0c68c2c164b45fd07bb8d5d0898f03abe118fd2120ffcb1fb6c949de9649a97c2e8105f24b9d131a725c67c0a502ca4d4d192c1a0d65f49d SHA512 e64449eeaf756c5bd945109937b84ba4bd8a015222bd792d39cf3947871e87571a4ca57814790e51544cb05ad4c2d1f044e818e4caaac7c2e2a02cb1aa290fcc
 DIST llvm-project-14.0.6.src.tar.xz 105618228 BLAKE2B ee67c5407df8cef493b9c0004f15e428f22a536a17e5f4e3eb29a003b8a8ec0abe0fa3e072591161d5f30ef7d8867c1ce34d1b341ad858e93c00263499941a99 SHA512 6fc6eeb60fac698702d1aac495fc0161eb7216a1f8db2020af8fccec5837831f7cc20dc2a169bf4f0b5f520748280b4a86621f3697d622aa58faaa45dbfaad13
 DIST llvm-project-14.0.6.src.tar.xz.sig 566 BLAKE2B cb658ad43d8ab6c43a5773aedadf0569c97b5ee4b1bd58eceb10e1879a30880c741c3d66bedd462c892309b688fb7b2673115a62d1f74d71ee375a578de9547f SHA512 b4a7b368532a7a4a24376cfa7db8f6d3478f6d4446474342fc00b474ecf466330cd0f16783209263c4c72d5fc7ddedfb11b95578842e700cfb7ee0bb34cc95d6
+DIST llvm-project-15.0.0rc2.src.tar.xz 112110968 BLAKE2B 98c3769f17f1958fbec771409eef781f5ca845363656c70fe5cd20bca1b8471e7a8773a7d4e395700c297a5f3f208fe1303cf18e2a73b45388b782fb7484106b SHA512 eee1bee1f83cc468fb4bb6839acbd5c1618dc35f35e51cd078288b91bad95d52edaadd05c88f2d72d51c1c338ba08b3346c070a28693b1224639eb7a1ef4a4d9
+DIST llvm-project-15.0.0rc2.src.tar.xz.sig 438 BLAKE2B 09f260b30724b41b27ef621929c086fd6c13bde51c4adb880897b549b2d336682f617faf3dd636ceb795e329b664972cf50745ab49f84e7540658d53074510da SHA512 9f695a309fbb15026dc133eb17d33abd26831eb036fad79dd8df37d4f4d9eeae1ca463acd037d2a1882bc2cff763e4bda507d1d827d845613bfd62d0f9fbd4ca
 DIST llvmorg-13.0.1.tar.gz 147290251 BLAKE2B 2a44b012a672501761d0c27c6b3a315b69bfef0cd13b078a7e7d2fccc4a9c8c0f2bee0f164c4271c9106b0a99cb06e8b64986f66253b613336719fb86b82541b SHA512 9a8cb5d11964ba88b7624f19ec861fb28701f23956ea3c92f6ac644332d5f41fde97bd8933dd3ee70ed378058c252fa3a3887c8d1af90d219970c2b27691166f
 EBUILD libcxx-13.0.1.ebuild 6780 BLAKE2B 575c9089d74bddc871e97147c53f7c298cd1683b989eba6b50601b45693c11d0647e3bd6f70c0a75caaea7ee3fea2f88f1bbad444d7f1785a62175337659e2e3 SHA512 f0ff78e48acca25cb925aee5106fba0d547ab8522ccfd65e2198d4f481f83abbadc415ac3808e45387fc945980f9892fdbda3b6a26d54163cebfa4f12fa17172
 EBUILD libcxx-14.0.6.ebuild 6960 BLAKE2B d95e91e206ef8b9173368016b15f6d6457f6892db5bacffd0b551365198e572cc0f492e3aa4e3b5cba902163572b424b713de68f7afede6115daa1920fb3c267 SHA512 61370b6464aa7f54c0f13a38922e5e05100817ca65fee5231acd0384693b3ef88a5e611b53bebea3931e9b9f8f5f0513475504a8ab62942316375196a1eae718
 EBUILD libcxx-15.0.0.9999.ebuild 6065 BLAKE2B 3816a2235860d89f5afcfaeaccc1d84a115ad0a06526f3b4383247e165cc1917737fa5c9c66d1189871ed60371c50db93d8194daaaa8c2b708d8dc0ec810c571 SHA512 22e742b874b9403f64eee8eee76552cd145ed4eca65523bd47b2bdddbb2a9436982c010bc10980ada9bb4a63a5d8663eec2d124a3517355eccbdd22b32f85bfb
+EBUILD libcxx-15.0.0_rc2.ebuild 6068 BLAKE2B 38bf81153ffcce8af7f2512d906cf8b25df9c297bf9d9265798e9d8254d13ad57bac7bed20203f74e735e964e61df85c4882cced9efed7e073fc97554c9a4fd4 SHA512 a67b7f247043622955666d0452953c6cf543db294d2658b1d90f42dfd2728a49bbf983dcfb9d07cf070e101d76b0088b6a03b132c67fe100c18ef6d4d7c249a1
 EBUILD libcxx-16.0.0.9999.ebuild 6065 BLAKE2B 3816a2235860d89f5afcfaeaccc1d84a115ad0a06526f3b4383247e165cc1917737fa5c9c66d1189871ed60371c50db93d8194daaaa8c2b708d8dc0ec810c571 SHA512 22e742b874b9403f64eee8eee76552cd145ed4eca65523bd47b2bdddbb2a9436982c010bc10980ada9bb4a63a5d8663eec2d124a3517355eccbdd22b32f85bfb
 MISC metadata.xml 828 BLAKE2B 40af456df8ac1cfdb66fd62a217abbb4ca837956529906118c35232000435d9e991d18dd0332b7b95eed70d4c7610c7a1aee80af8ba511763edc1423749a4aa4 SHA512 257f8fd05fcade26ca02305356b67c8e2d67a87b180e38a189a659212093b07b9a710b871fbaab894dba9eba5fe450b76c52cc82f6405c24cc1ab2df3abe8bfd
diff --git a/sys-libs/libcxx/libcxx-15.0.0_rc2.ebuild b/sys-libs/libcxx/libcxx-15.0.0_rc2.ebuild
new file mode 100644
index 000000000000..e6120dc78ebd
--- /dev/null
+++ b/sys-libs/libcxx/libcxx-15.0.0_rc2.ebuild
@@ -0,0 +1,228 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+CMAKE_ECLASS=cmake
+PYTHON_COMPAT=( python3_{8..11} )
+inherit cmake-multilib flag-o-matic llvm llvm.org python-any-r1 \
+	toolchain-funcs
+
+DESCRIPTION="New implementation of the C++ standard library, targeting C++11"
+HOMEPAGE="https://libcxx.llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="+clang +libcxxabi static-libs test"
+REQUIRED_USE="test? ( clang )"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	libcxxabi? (
+		~sys-libs/libcxxabi-${PV}[static-libs?,${MULTILIB_USEDEP}]
+	)
+	!libcxxabi? ( >=sys-devel/gcc-4.7:=[cxx] )
+"
+# llvm-6 for new lit options
+# clang-3.9.0 installs necessary target symlinks unconditionally
+# which removes the need for MULTILIB_USEDEP
+DEPEND="
+	${RDEPEND}
+	>=sys-devel/llvm-6
+"
+BDEPEND="
+	clang? (
+		sys-devel/clang
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+	test? (
+		>=dev-util/cmake-3.16
+		sys-devel/gdb[python]
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+	)
+"
+
+LLVM_COMPONENTS=( runtimes libcxx{,abi} llvm/{cmake,utils/llvm-lit} cmake )
+LLVM_PATCHSET=${PV/_/-}
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+pkg_setup() {
+	# Darwin Prefix builds do not have llvm installed yet, so rely on
+	# bootstrap-prefix to set the appropriate path vars to LLVM instead
+	# of using llvm_pkg_setup.
+	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
+		llvm_pkg_setup
+	fi
+	python-any-r1_pkg_setup
+
+	if ! use libcxxabi && ! tc-is-gcc ; then
+		eerror "To build ${PN} against libsupc++, you have to use gcc. Other"
+		eerror "compilers are not supported. Please set CC=gcc and CXX=g++"
+		eerror "and try again."
+		die
+	fi
+}
+
+test_compiler() {
+	$(tc-getCXX) ${CXXFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c++ - \
+		<<<'int main() { return 0; }' &>/dev/null
+}
+
+src_configure() {
+	# note: we need to do this before multilib kicks in since it will
+	# alter the CHOST
+	local cxxabi cxxabi_incs
+	if use libcxxabi; then
+		cxxabi=system-libcxxabi
+		cxxabi_incs="${EPREFIX}/usr/include/c++/v1"
+	else
+		local gcc_inc="${EPREFIX}/usr/lib/gcc/${CHOST}/$(gcc-fullversion)/include/g++-v$(gcc-major-version)"
+		cxxabi=libsupc++
+		cxxabi_incs="${gcc_inc};${gcc_inc}/${CHOST}"
+	fi
+
+	multilib-minimal_src_configure
+}
+
+multilib_src_configure() {
+	if use clang && ! tc-is-clang; then
+		# Only do this conditionally to allow overriding with
+		# e.g. CC=clang-13 in case of breakage
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	# link against compiler-rt instead of libgcc if this is what clang does
+	local want_compiler_rt=OFF
+	if tc-is-clang; then
+		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
+			${LDFLAGS} -print-libgcc-file-name)
+		if [[ ${compiler_rt} == *libclang_rt* ]]; then
+			want_compiler_rt=ON
+		fi
+	fi
+
+	# bootstrap: cmake is unhappy if compiler can't link to stdlib
+	local nolib_flags=( -nodefaultlibs -lc )
+	if ! test_compiler; then
+		if test_compiler "${nolib_flags[@]}"; then
+			local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
+			ewarn "${CXX} seems to lack runtime, trying with ${nolib_flags[*]}"
+		fi
+	fi
+
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
+		-DPython3_EXECUTABLE="${PYTHON}"
+		-DLLVM_ENABLE_RUNTIMES=libcxx
+		-DLLVM_INCLUDE_TESTS=OFF
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+
+		-DLIBCXX_ENABLE_SHARED=ON
+		-DLIBCXX_ENABLE_STATIC=$(usex static-libs)
+		-DLIBCXX_CXX_ABI=${cxxabi}
+		-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${cxxabi_incs}
+		# we're using our own mechanism for generating linker scripts
+		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
+		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
+		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
+		-DLIBCXX_INCLUDE_TESTS=$(usex test)
+		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+	)
+
+	if use test; then
+		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
+		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
+
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+			-DPython3_EXECUTABLE="${PYTHON}"
+		)
+	fi
+	cmake_src_configure
+}
+
+multilib_src_compile() {
+	cmake_src_compile
+	if [[ ${CHOST} != *-darwin* ]] ; then
+		gen_shared_ldscript
+		use static-libs && gen_static_ldscript
+	fi
+}
+
+multilib_src_test() {
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check-cxx
+}
+
+multilib_src_install() {
+	cmake_src_install
+	# since we've replaced libc++.{a,so} with ldscripts, now we have to
+	# install the extra symlinks
+	if [[ ${CHOST} != *-darwin* ]] ; then
+		dolib.so lib/libc++_shared.so
+		use static-libs && dolib.a lib/libc++_static.a
+	fi
+}
+
+# Usage: deps
+gen_ldscript() {
+	local output_format
+	output_format=$($(tc-getCC) ${CFLAGS} ${LDFLAGS} -Wl,--verbose 2>&1 | sed -n 's/^OUTPUT_FORMAT("\([^"]*\)",.*/\1/p')
+	[[ -n ${output_format} ]] && output_format="OUTPUT_FORMAT ( ${output_format} )"
+
+	cat <<-END_LDSCRIPT
+/* GNU ld script
+   Include missing dependencies
+*/
+${output_format}
+GROUP ( $@ )
+END_LDSCRIPT
+}
+
+gen_static_ldscript() {
+	# Move it first.
+	mv lib/libc++{,_static}.a || die
+	# Generate libc++.a ldscript for inclusion of its dependencies so that
+	# clang++ -stdlib=libc++ -static works out of the box.
+	local deps=(
+		libc++_static.a
+		$(usex libcxxabi libc++abi.a libsupc++.a)
+	)
+	# On Linux/glibc it does not link without libpthread or libdl. It is
+	# fine on FreeBSD.
+	use elibc_glibc && deps+=( libpthread.a libdl.a )
+
+	gen_ldscript "${deps[*]}" > lib/libc++.a || die
+}
+
+gen_shared_ldscript() {
+	# Move it first.
+	mv lib/libc++{,_shared}.so || die
+	local deps=(
+		libc++_shared.so
+		# libsupc++ doesn't have a shared version
+		$(usex libcxxabi libc++abi.so libsupc++.a)
+	)
+
+	gen_ldscript "${deps[*]}" > lib/libc++.so || die
+}
+
+pkg_postinst() {
+	elog "This package (${PN}) is mainly intended as a replacement for the C++"
+	elog "standard library when using clang."
+	elog "To use it, instead of libstdc++, use:"
+	elog "    clang++ -stdlib=libc++"
+	elog "to compile your C++ programs."
+}
diff --git a/sys-libs/libcxxabi/Manifest b/sys-libs/libcxxabi/Manifest
index 1b6a9250befe..e720a3444dbb 100644
--- a/sys-libs/libcxxabi/Manifest
+++ b/sys-libs/libcxxabi/Manifest
@@ -1,8 +1,11 @@
 DIST llvm-project-14.0.6.src.tar.xz 105618228 BLAKE2B ee67c5407df8cef493b9c0004f15e428f22a536a17e5f4e3eb29a003b8a8ec0abe0fa3e072591161d5f30ef7d8867c1ce34d1b341ad858e93c00263499941a99 SHA512 6fc6eeb60fac698702d1aac495fc0161eb7216a1f8db2020af8fccec5837831f7cc20dc2a169bf4f0b5f520748280b4a86621f3697d622aa58faaa45dbfaad13
 DIST llvm-project-14.0.6.src.tar.xz.sig 566 BLAKE2B cb658ad43d8ab6c43a5773aedadf0569c97b5ee4b1bd58eceb10e1879a30880c741c3d66bedd462c892309b688fb7b2673115a62d1f74d71ee375a578de9547f SHA512 b4a7b368532a7a4a24376cfa7db8f6d3478f6d4446474342fc00b474ecf466330cd0f16783209263c4c72d5fc7ddedfb11b95578842e700cfb7ee0bb34cc95d6
+DIST llvm-project-15.0.0rc2.src.tar.xz 112110968 BLAKE2B 98c3769f17f1958fbec771409eef781f5ca845363656c70fe5cd20bca1b8471e7a8773a7d4e395700c297a5f3f208fe1303cf18e2a73b45388b782fb7484106b SHA512 eee1bee1f83cc468fb4bb6839acbd5c1618dc35f35e51cd078288b91bad95d52edaadd05c88f2d72d51c1c338ba08b3346c070a28693b1224639eb7a1ef4a4d9
+DIST llvm-project-15.0.0rc2.src.tar.xz.sig 438 BLAKE2B 09f260b30724b41b27ef621929c086fd6c13bde51c4adb880897b549b2d336682f617faf3dd636ceb795e329b664972cf50745ab49f84e7540658d53074510da SHA512 9f695a309fbb15026dc133eb17d33abd26831eb036fad79dd8df37d4f4d9eeae1ca463acd037d2a1882bc2cff763e4bda507d1d827d845613bfd62d0f9fbd4ca
 DIST llvmorg-13.0.1.tar.gz 147290251 BLAKE2B 2a44b012a672501761d0c27c6b3a315b69bfef0cd13b078a7e7d2fccc4a9c8c0f2bee0f164c4271c9106b0a99cb06e8b64986f66253b613336719fb86b82541b SHA512 9a8cb5d11964ba88b7624f19ec861fb28701f23956ea3c92f6ac644332d5f41fde97bd8933dd3ee70ed378058c252fa3a3887c8d1af90d219970c2b27691166f
 EBUILD libcxxabi-13.0.1.ebuild 3605 BLAKE2B 7bdc8ecd9c35cdc247f08f9d5687d7362013be7c9c5afe006817cb5a384d4dd272bc686c6fe2ddf2a9bde5be8d1fa185ae60da940fded833a356f76e6105feb8 SHA512 69c4564fc68e3037620de0ce0cda29093bff9eb919f48f4760558edd1031c0d198991e6346774244701679aa0619d6afd814ec80d0d66265418408416621d9d0
 EBUILD libcxxabi-14.0.6.ebuild 3521 BLAKE2B 3f5bb6329c14a608fb52e2429ba4acbff8ec2c490d832beae73956a4323c896e8d7030261fb845002cf1682bd7331cbb0e31df2ea214dda583cd004ae6c2f9db SHA512 92e061f2f4736f8a6fcc5240870dbdb4574a2945d77de0f00d6c7fd2011e76edf63084bb7ee6c32f038a708c5d1df4753aaa936470d0670cd772113f38cef62a
 EBUILD libcxxabi-15.0.0.9999.ebuild 3303 BLAKE2B 75a33d5039be0e5400680a7144c9cb50bf7b7fe6fb0edadf1d8d929a3bfeff2f752b08c4a9ba11ee46355b9a353da7b586449521edf779fd5edfcdd78db2ade0 SHA512 3f7851502ea769fad89ef013fbf42b9e8763f25139f4440dbadda8b559d14b7b3aff09c388233a3906d8895a76308f6fd9fa7900cf2535567c4b271083c9692f
+EBUILD libcxxabi-15.0.0_rc2.ebuild 3303 BLAKE2B 75a33d5039be0e5400680a7144c9cb50bf7b7fe6fb0edadf1d8d929a3bfeff2f752b08c4a9ba11ee46355b9a353da7b586449521edf779fd5edfcdd78db2ade0 SHA512 3f7851502ea769fad89ef013fbf42b9e8763f25139f4440dbadda8b559d14b7b3aff09c388233a3906d8895a76308f6fd9fa7900cf2535567c4b271083c9692f
 EBUILD libcxxabi-16.0.0.9999.ebuild 3303 BLAKE2B 75a33d5039be0e5400680a7144c9cb50bf7b7fe6fb0edadf1d8d929a3bfeff2f752b08c4a9ba11ee46355b9a353da7b586449521edf779fd5edfcdd78db2ade0 SHA512 3f7851502ea769fad89ef013fbf42b9e8763f25139f4440dbadda8b559d14b7b3aff09c388233a3906d8895a76308f6fd9fa7900cf2535567c4b271083c9692f
 MISC metadata.xml 557 BLAKE2B 4f6b0acb7cfdf74971a6fd96051d9f9020141c6117333a8de42bd043935b7bff8d9942faabdf3b1c94597c460393f64eb7d3f7b7d49f39ecfd0094de460f563e SHA512 67a812ef768e681ae77ef6e13bccffcbe53b41e94901f0558b3c7acaf896605ca670c4bb5a690bd9afa3b5a76271341710520a6abc0024c18f437fabde20e847
diff --git a/sys-libs/libcxxabi/libcxxabi-15.0.0_rc2.ebuild b/sys-libs/libcxxabi/libcxxabi-15.0.0_rc2.ebuild
new file mode 100644
index 000000000000..308024bf9d49
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-15.0.0_rc2.ebuild
@@ -0,0 +1,129 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+CMAKE_ECLASS=cmake
+PYTHON_COMPAT=( python3_{8..11} )
+inherit cmake-multilib flag-o-matic llvm llvm.org python-any-r1 \
+	toolchain-funcs
+
+DESCRIPTION="Low level support for a standard C++ library"
+HOMEPAGE="https://libcxxabi.llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="+clang static-libs test"
+REQUIRED_USE="test? ( clang )"
+RESTRICT="!test? ( test )"
+
+# in 15.x, cxxabi.h is moving from libcxx to libcxxabi
+RDEPEND+="
+	!<sys-libs/libcxx-15
+"
+# llvm-6 for new lit options
+DEPEND="
+	${RDEPEND}
+	>=sys-devel/llvm-6
+"
+BDEPEND="
+	clang? (
+		sys-devel/clang
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+	test? (
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+	)
+"
+
+LLVM_COMPONENTS=( runtimes libcxx{abi,} llvm/cmake cmake )
+LLVM_TEST_COMPONENTS=( llvm/utils/llvm-lit )
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+pkg_setup() {
+	# darwin prefix builds do not have llvm installed yet, so rely on bootstrap-prefix
+	# to set the appropriate path vars to LLVM instead of using llvm_pkg_setup.
+	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
+		llvm_pkg_setup
+	fi
+	python-any-r1_pkg_setup
+}
+
+multilib_src_configure() {
+	if use clang && ! tc-is-clang; then
+		# Only do this conditionally to allow overriding with
+		# e.g. CC=clang-13 in case of breakage
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	# link against compiler-rt instead of libgcc if this is what clang does
+	local want_compiler_rt=OFF
+	if tc-is-clang; then
+		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
+			${LDFLAGS} -print-libgcc-file-name)
+		if [[ ${compiler_rt} == *libclang_rt* ]]; then
+			want_compiler_rt=ON
+		fi
+	fi
+
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
+		-DPython3_EXECUTABLE="${PYTHON}"
+		-DLLVM_ENABLE_RUNTIMES="libcxxabi;libcxx"
+		-DLLVM_INCLUDE_TESTS=OFF
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+		-DLIBCXXABI_ENABLE_SHARED=ON
+		-DLIBCXXABI_ENABLE_STATIC=$(usex static-libs)
+		-DLIBCXXABI_INCLUDE_TESTS=$(usex test)
+		-DLIBCXXABI_USE_COMPILER_RT=${want_compiler_rt}
+
+		# upstream is omitting standard search path for this
+		# probably because gcc & clang are bundling their own unwind.h
+		-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
+
+		-DLIBCXX_LIBDIR_SUFFIX=
+		-DLIBCXX_ENABLE_SHARED=ON
+		-DLIBCXX_ENABLE_STATIC=OFF
+		-DLIBCXX_CXX_ABI=libcxxabi
+		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
+		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
+		-DLIBCXX_HAS_GCC_S_LIB=OFF
+		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
+		-DLIBCXX_INCLUDE_TESTS=OFF
+	)
+	if use test; then
+		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
+		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
+
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+			-DPython3_EXECUTABLE="${PYTHON}"
+		)
+	fi
+	cmake_src_configure
+}
+
+multilib_src_compile() {
+	cmake_build cxxabi
+}
+
+multilib_src_test() {
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check-cxxabi
+}
+
+multilib_src_install() {
+	DESTDIR="${D}" cmake_build install-cxxabi
+}
diff --git a/sys-libs/libomp/Manifest b/sys-libs/libomp/Manifest
index 464577bef550..dac2678e1c16 100644
--- a/sys-libs/libomp/Manifest
+++ b/sys-libs/libomp/Manifest
@@ -1,10 +1,14 @@
 DIST llvm-gentoo-patchset-13.0.1.tar.xz 6288 BLAKE2B 899222b962486e924e4f8a2b574d285531a3f87af9385ff68c81db92aa224a0cde6d4ee049b5405056bedb4b232b50e1d5840024071a4a215f6311853304c92d SHA512 b2805337f1deca626768a44c5e7ac9ed16e0c31bead1647d44a493a8123c1b8e8f1c8ceee3536bcc6fa87fdd3fcec408229f701adf30eff07e7ef9889b847b01
 DIST llvm-gentoo-patchset-14.0.6-r2.tar.xz 16120 BLAKE2B e12e522fdb7ba505693c679cb09cc8e00e6a954df195c86c2af4dbf1b68334a405b8dcc45f2e28b5e5e0b7e9d5eb7ba907337027927371b7a3b7784ff8aae7e0 SHA512 8a5ea71c30fc0727cc855dd812bbcb6d5f51c80c98eb3d5b80258d5c5eaab1310edc9d53ae63c2ca827abec68e2912c4b69ef0da351ff883fb30545a61e1d09c
+DIST llvm-gentoo-patchset-15.0.0-rc2.tar.xz 5768 BLAKE2B 03822c4dfbe3157d9131a3524beeda22fbc6adc937af052fd0fbcc23fb6ea86e1a5e015c316b53019820de5b81b1b065bfcbc31608598307f03af39f215fb12e SHA512 b9d7adb9b738a565c2142360c5ff7a7aa8405ce78af8767867203dd003e5bdb2b8a7f14179fdb7dc0c5cdc696cfff55c4886cfcd0894672284b453943e4e7269
 DIST llvm-project-14.0.6.src.tar.xz 105618228 BLAKE2B ee67c5407df8cef493b9c0004f15e428f22a536a17e5f4e3eb29a003b8a8ec0abe0fa3e072591161d5f30ef7d8867c1ce34d1b341ad858e93c00263499941a99 SHA512 6fc6eeb60fac698702d1aac495fc0161eb7216a1f8db2020af8fccec5837831f7cc20dc2a169bf4f0b5f520748280b4a86621f3697d622aa58faaa45dbfaad13
 DIST llvm-project-14.0.6.src.tar.xz.sig 566 BLAKE2B cb658ad43d8ab6c43a5773aedadf0569c97b5ee4b1bd58eceb10e1879a30880c741c3d66bedd462c892309b688fb7b2673115a62d1f74d71ee375a578de9547f SHA512 b4a7b368532a7a4a24376cfa7db8f6d3478f6d4446474342fc00b474ecf466330cd0f16783209263c4c72d5fc7ddedfb11b95578842e700cfb7ee0bb34cc95d6
+DIST llvm-project-15.0.0rc2.src.tar.xz 112110968 BLAKE2B 98c3769f17f1958fbec771409eef781f5ca845363656c70fe5cd20bca1b8471e7a8773a7d4e395700c297a5f3f208fe1303cf18e2a73b45388b782fb7484106b SHA512 eee1bee1f83cc468fb4bb6839acbd5c1618dc35f35e51cd078288b91bad95d52edaadd05c88f2d72d51c1c338ba08b3346c070a28693b1224639eb7a1ef4a4d9
+DIST llvm-project-15.0.0rc2.src.tar.xz.sig 438 BLAKE2B 09f260b30724b41b27ef621929c086fd6c13bde51c4adb880897b549b2d336682f617faf3dd636ceb795e329b664972cf50745ab49f84e7540658d53074510da SHA512 9f695a309fbb15026dc133eb17d33abd26831eb036fad79dd8df37d4f4d9eeae1ca463acd037d2a1882bc2cff763e4bda507d1d827d845613bfd62d0f9fbd4ca
 DIST llvmorg-13.0.1.tar.gz 147290251 BLAKE2B 2a44b012a672501761d0c27c6b3a315b69bfef0cd13b078a7e7d2fccc4a9c8c0f2bee0f164c4271c9106b0a99cb06e8b64986f66253b613336719fb86b82541b SHA512 9a8cb5d11964ba88b7624f19ec861fb28701f23956ea3c92f6ac644332d5f41fde97bd8933dd3ee70ed378058c252fa3a3887c8d1af90d219970c2b27691166f
 EBUILD libomp-13.0.1.ebuild 3836 BLAKE2B bfecc3ecb5928ba0c4f1e79baf7108705b33b654631ebc05a52bebab494eebefe6ec1f7403170f5e0b541942618a88ebad52f5ba80bf185a2544170df3c84bcc SHA512 97a257c4e40440c83dc72d76f67d5b4b49ea74b138e541163c3bc938a50052fae3ae988c60a290c1b0051efc623f9be464c1801b5b7569a8cbb446724fe8267b
 EBUILD libomp-14.0.6-r1.ebuild 3846 BLAKE2B ba454ff21aa950024868546e76e34f7eae5e0df1e72f828832c7f32d4b5cb544d479b18e609adbfc2352e5773c9cc08717a0b09d6bcbf1c76020dc4911edd7e6 SHA512 6547e2e6c9847fa9dc0eee0717db07347764937f942db9a13f3e47615954fc3a15b7db1516f629c0e2036ee8367cba6aea7bd27c27d2a4b9b51922afc97e7ebb
 EBUILD libomp-15.0.0.9999.ebuild 3250 BLAKE2B 93eb6805d0b96f8b9adb99c0b69b41a8b0f7e58c9aa3a8c8d58d98b265f0656b802638b3faf206f8603e7a591227eeb1853a97be6629c24b32c2f609369e3be5 SHA512 340e88828c233a54a03622db8cbfc468fc9a117665014cf5c431ae611e21bffe6286d3cd41478ae6425047ba9cb1f067498c19895b74dc432e93caf753874c70
+EBUILD libomp-15.0.0_rc2.ebuild 3274 BLAKE2B 5318e87c87ae1f1248e1e3fb665ad0d3951699f6130db22dcae50440085e32056e5b498bf0c2dafefcd257b73abf4b49bbf0085fc8251f9bfacee02f108291f7 SHA512 e8b06aa88286a7958fc43f6abe4a26b77930c3f809724d272ffe88bf12bf9567315ffab33f0a1fb63e68b45e92b65b6894f99bdb608cabcb0a8a09384ee01f37
 EBUILD libomp-16.0.0.9999.ebuild 3250 BLAKE2B 93eb6805d0b96f8b9adb99c0b69b41a8b0f7e58c9aa3a8c8d58d98b265f0656b802638b3faf206f8603e7a591227eeb1853a97be6629c24b32c2f609369e3be5 SHA512 340e88828c233a54a03622db8cbfc468fc9a117665014cf5c431ae611e21bffe6286d3cd41478ae6425047ba9cb1f067498c19895b74dc432e93caf753874c70
 MISC metadata.xml 908 BLAKE2B c200fb1c93ae8fbd3963b2b575586fbe8f6df2308a2babbe3da77c2cf59c3fa43f938849d47df2ef4acf381f247848c363a20cf33ad763be169764cbe43c4bb4 SHA512 3cde603a2de523c21fbf288d459d76c697f2291d3dc3dac47e70781a910b4d524442d3076d8541818f2d43c3c6477af75d5f0cb76c4fbe0b4567a11d67edb056
diff --git a/sys-libs/libomp/libomp-15.0.0_rc2.ebuild b/sys-libs/libomp/libomp-15.0.0_rc2.ebuild
new file mode 100644
index 000000000000..38cf52e1736e
--- /dev/null
+++ b/sys-libs/libomp/libomp-15.0.0_rc2.ebuild
@@ -0,0 +1,130 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+CMAKE_ECLASS=cmake
+PYTHON_COMPAT=( python3_{8..11} )
+inherit cmake-multilib linux-info llvm llvm.org python-any-r1
+
+DESCRIPTION="OpenMP runtime library for LLVM/clang compiler"
+HOMEPAGE="https://openmp.llvm.org"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="
+	debug hwloc offload ompt test
+	llvm_targets_AMDGPU llvm_targets_NVPTX
+"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	hwloc? ( >=sys-apps/hwloc-2.5:0=[${MULTILIB_USEDEP}] )
+	offload? (
+		virtual/libelf:=[${MULTILIB_USEDEP}]
+		dev-libs/libffi:=[${MULTILIB_USEDEP}]
+		~sys-devel/llvm-${PV}[${MULTILIB_USEDEP}]
+	)
+"
+# tests:
+# - dev-python/lit provides the test runner
+# - sys-devel/llvm provide test utils (e.g. FileCheck)
+# - sys-devel/clang provides the compiler to run tests
+DEPEND="
+	${RDEPEND}
+"
+BDEPEND="
+	dev-lang/perl
+	offload? (
+		llvm_targets_AMDGPU? ( sys-devel/clang )
+		llvm_targets_NVPTX? ( sys-devel/clang )
+		virtual/pkgconfig
+	)
+	test? (
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+		sys-devel/clang
+	)
+"
+
+LLVM_COMPONENTS=( openmp cmake llvm/include )
+LLVM_PATCHSET=${PV/_/-}
+llvm.org_set_globals
+
+python_check_deps() {
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+kernel_pds_check() {
+	if use kernel_linux && kernel_is -lt 4 15 && kernel_is -ge 4 13; then
+		local CONFIG_CHECK="~!SCHED_PDS"
+		local ERROR_SCHED_PDS="\
+PDS scheduler versions >= 0.98c < 0.98i (e.g. used in kernels >= 4.13-pf11
+< 4.14-pf9) do not implement sched_yield() call which may result in horrible
+performance problems with libomp. If you are using one of the specified
+kernel versions, you may want to disable the PDS scheduler."
+
+		check_extra_config
+	fi
+}
+
+pkg_pretend() {
+	kernel_pds_check
+}
+
+pkg_setup() {
+	use offload && LLVM_MAX_SLOT=${PV%%.*} llvm_pkg_setup
+	use test && python-any-r1_pkg_setup
+}
+
+multilib_src_configure() {
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+
+	local libdir="$(get_libdir)"
+	local mycmakeargs=(
+		-DOPENMP_LIBDIR_SUFFIX="${libdir#lib}"
+
+		-DLIBOMP_USE_HWLOC=$(usex hwloc)
+		-DLIBOMP_OMPT_SUPPORT=$(usex ompt)
+
+		-DOPENMP_ENABLE_LIBOMPTARGET=$(usex offload)
+
+		# do not install libgomp.so & libiomp5.so aliases
+		-DLIBOMP_INSTALL_ALIASES=OFF
+		# disable unnecessary hack copying stuff back to srcdir
+		-DLIBOMP_COPY_EXPORTS=OFF
+	)
+
+	if use offload; then
+		if has "${CHOST%%-*}" aarch64 powerpc64le x86_64; then
+			mycmakeargs+=(
+				-DLIBOMPTARGET_BUILD_AMDGPU_PLUGIN=$(usex llvm_targets_AMDGPU)
+				-DLIBOMPTARGET_BUILD_CUDA_PLUGIN=$(usex llvm_targets_NVPTX)
+			)
+		else
+			mycmakeargs+=(
+				-DLIBOMPTARGET_BUILD_AMDGPU_PLUGIN=OFF
+				-DLIBOMPTARGET_BUILD_CUDA_PLUGIN=OFF
+			)
+		fi
+	fi
+
+	use test && mycmakeargs+=(
+		# this project does not use standard LLVM cmake macros
+		-DOPENMP_LLVM_LIT_EXECUTABLE="${EPREFIX}/usr/bin/lit"
+		-DOPENMP_LIT_ARGS="$(get_lit_flags)"
+
+		-DOPENMP_TEST_C_COMPILER="$(type -P "${CHOST}-clang")"
+		-DOPENMP_TEST_CXX_COMPILER="$(type -P "${CHOST}-clang++")"
+	)
+	addpredict /dev/nvidiactl
+	cmake_src_configure
+}
+
+multilib_src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+
+	cmake_build check-libomp
+}
diff --git a/sys-libs/llvm-libunwind/Manifest b/sys-libs/llvm-libunwind/Manifest
index 3f9796151dad..ab9c0c05b56a 100644
--- a/sys-libs/llvm-libunwind/Manifest
+++ b/sys-libs/llvm-libunwind/Manifest
@@ -1,9 +1,12 @@
 DIST llvm-gentoo-patchset-13.0.1.tar.xz 6288 BLAKE2B 899222b962486e924e4f8a2b574d285531a3f87af9385ff68c81db92aa224a0cde6d4ee049b5405056bedb4b232b50e1d5840024071a4a215f6311853304c92d SHA512 b2805337f1deca626768a44c5e7ac9ed16e0c31bead1647d44a493a8123c1b8e8f1c8ceee3536bcc6fa87fdd3fcec408229f701adf30eff07e7ef9889b847b01
 DIST llvm-project-14.0.6.src.tar.xz 105618228 BLAKE2B ee67c5407df8cef493b9c0004f15e428f22a536a17e5f4e3eb29a003b8a8ec0abe0fa3e072591161d5f30ef7d8867c1ce34d1b341ad858e93c00263499941a99 SHA512 6fc6eeb60fac698702d1aac495fc0161eb7216a1f8db2020af8fccec5837831f7cc20dc2a169bf4f0b5f520748280b4a86621f3697d622aa58faaa45dbfaad13
 DIST llvm-project-14.0.6.src.tar.xz.sig 566 BLAKE2B cb658ad43d8ab6c43a5773aedadf0569c97b5ee4b1bd58eceb10e1879a30880c741c3d66bedd462c892309b688fb7b2673115a62d1f74d71ee375a578de9547f SHA512 b4a7b368532a7a4a24376cfa7db8f6d3478f6d4446474342fc00b474ecf466330cd0f16783209263c4c72d5fc7ddedfb11b95578842e700cfb7ee0bb34cc95d6
+DIST llvm-project-15.0.0rc2.src.tar.xz 112110968 BLAKE2B 98c3769f17f1958fbec771409eef781f5ca845363656c70fe5cd20bca1b8471e7a8773a7d4e395700c297a5f3f208fe1303cf18e2a73b45388b782fb7484106b SHA512 eee1bee1f83cc468fb4bb6839acbd5c1618dc35f35e51cd078288b91bad95d52edaadd05c88f2d72d51c1c338ba08b3346c070a28693b1224639eb7a1ef4a4d9
+DIST llvm-project-15.0.0rc2.src.tar.xz.sig 438 BLAKE2B 09f260b30724b41b27ef621929c086fd6c13bde51c4adb880897b549b2d336682f617faf3dd636ceb795e329b664972cf50745ab49f84e7540658d53074510da SHA512 9f695a309fbb15026dc133eb17d33abd26831eb036fad79dd8df37d4f4d9eeae1ca463acd037d2a1882bc2cff763e4bda507d1d827d845613bfd62d0f9fbd4ca
 DIST llvmorg-13.0.1.tar.gz 147290251 BLAKE2B 2a44b012a672501761d0c27c6b3a315b69bfef0cd13b078a7e7d2fccc4a9c8c0f2bee0f164c4271c9106b0a99cb06e8b64986f66253b613336719fb86b82541b SHA512 9a8cb5d11964ba88b7624f19ec861fb28701f23956ea3c92f6ac644332d5f41fde97bd8933dd3ee70ed378058c252fa3a3887c8d1af90d219970c2b27691166f
 EBUILD llvm-libunwind-13.0.1.ebuild 3814 BLAKE2B 90b96e50590839f5bcc8e9d47219e0a6af25c23fd7a6851316596960c00481fbbd02ae606092d79f15648cfb511be9ce44cfec8bb3f185e098eb4eb6bec1c0da SHA512 ee5d861f886d8e33946056ac14a838788dcca42f9e3879fee79f7a211fa2b4eb4481b0f61ec1c77c9b41c9be97ded6fa4e32f63c35bd6ea2a28d0bc503f7ba29
 EBUILD llvm-libunwind-14.0.6.ebuild 3203 BLAKE2B 8ae5c78793e1a71e5f884666d2248bf0495342c4e8bdd80a4fab994e0d46c561790f9dfab32a6d04007dbbe60e5be7b3aa858f379a10f57d6fed3e2e43efc839 SHA512 1065bb6669a83d982e901f50701daf16bd4ae776e0c858fdcfec96c5d41f3a87c7cf53634b6a391422664839e264b9df96752d88054085a498ba718294becc16
-EBUILD llvm-libunwind-15.0.0.9999.ebuild 3025 BLAKE2B d5d6b962382b7c52ca4b95f81d2f3ebb38e35ed646653b0a277abdb53da4d88f195f7fb0dce10e46bc85b20815bebc26ded2aeacb962240c9e70ee6864305416 SHA512 caec661ab8860c6f992b41415f8d9ff215e5c2f95f3b446a2807ffe6ad59c686ef14b3d94f996cb1e090d4e8c49d1fcff67f7ee13b2d751c95adeea8fc78f26e
-EBUILD llvm-libunwind-16.0.0.9999.ebuild 3025 BLAKE2B d5d6b962382b7c52ca4b95f81d2f3ebb38e35ed646653b0a277abdb53da4d88f195f7fb0dce10e46bc85b20815bebc26ded2aeacb962240c9e70ee6864305416 SHA512 caec661ab8860c6f992b41415f8d9ff215e5c2f95f3b446a2807ffe6ad59c686ef14b3d94f996cb1e090d4e8c49d1fcff67f7ee13b2d751c95adeea8fc78f26e
+EBUILD llvm-libunwind-15.0.0.9999.ebuild 3066 BLAKE2B 61c4948db6029c903dbd39a4f38f8267bcb24ef829719cb56632f9b1f6eb159aa7f745675c5f11b0fb9c349d9e74a44b848225c289d0842ef97220c768585b51 SHA512 9250de911107f95fa73472800f557493be59f6f0f4958f3bb6eee0b24873b7d060a4550db69d21a392028b324ab1cdc29342d7dc736d2b8aeeb66ff65c3f5be4
+EBUILD llvm-libunwind-15.0.0_rc2.ebuild 3066 BLAKE2B 61c4948db6029c903dbd39a4f38f8267bcb24ef829719cb56632f9b1f6eb159aa7f745675c5f11b0fb9c349d9e74a44b848225c289d0842ef97220c768585b51 SHA512 9250de911107f95fa73472800f557493be59f6f0f4958f3bb6eee0b24873b7d060a4550db69d21a392028b324ab1cdc29342d7dc736d2b8aeeb66ff65c3f5be4
+EBUILD llvm-libunwind-16.0.0.9999.ebuild 3066 BLAKE2B 61c4948db6029c903dbd39a4f38f8267bcb24ef829719cb56632f9b1f6eb159aa7f745675c5f11b0fb9c349d9e74a44b848225c289d0842ef97220c768585b51 SHA512 9250de911107f95fa73472800f557493be59f6f0f4958f3bb6eee0b24873b7d060a4550db69d21a392028b324ab1cdc29342d7dc736d2b8aeeb66ff65c3f5be4
 MISC metadata.xml 438 BLAKE2B 2a36fbbc59e137056029c62aef6d167d9c82531c2582d7bad5cb13cc36e5c4c9518ffe8c56d06bbcfd97ad22eda71a8b776f3984195f53d06cf45659b438dc00 SHA512 4f18b054072d00e5440faa31a59f9ef587d035b5f25e30913f0b1449debee967fa794fae2548e87db3fb2177ce853ab075e1f11f3cc763f5d7fdf06147108845
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0.9999.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0.9999.ebuild
index 2abe825b0946..70ee605d38b3 100644
--- a/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0.9999.ebuild
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0.9999.ebuild
@@ -69,6 +69,7 @@ multilib_src_configure() {
 	fi
 
 	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
 		-DPython3_EXECUTABLE="${PYTHON}"
 		-DLLVM_ENABLE_RUNTIMES="libunwind"
 		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0_rc2.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0_rc2.ebuild
new file mode 100644
index 000000000000..70ee605d38b3
--- /dev/null
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-15.0.0_rc2.ebuild
@@ -0,0 +1,124 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+CMAKE_ECLASS=cmake
+PYTHON_COMPAT=( python3_{8..11} )
+inherit cmake-multilib flag-o-matic llvm llvm.org python-any-r1 \
+	toolchain-funcs
+
+DESCRIPTION="C++ runtime stack unwinder from LLVM"
+HOMEPAGE="https://llvm.org/docs/ExceptionHandling.html"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="+clang debug static-libs test"
+REQUIRED_USE="test? ( clang )"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	!sys-libs/libunwind
+"
+# llvm-6 for new lit options
+DEPEND="
+	>=sys-devel/llvm-6
+"
+BDEPEND="
+	clang? (
+		sys-devel/clang
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+	test? (
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+	)
+"
+
+LLVM_COMPONENTS=( runtimes libunwind libcxx llvm/cmake cmake )
+LLVM_TEST_COMPONENTS=( libcxxabi llvm/utils/llvm-lit )
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	local use_compiler_rt=OFF
+	local libdir=$(get_libdir)
+
+	if use clang && ! tc-is-clang; then
+		# Only do this conditionally to allow overriding with
+		# e.g. CC=clang-13 in case of breakage
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	# link to compiler-rt
+	# https://github.com/gentoo/gentoo/pull/21516
+	if tc-is-clang; then
+		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
+		   ${LD_FLAGS} -print-libgcc-file-name)
+		if [[ ${compiler_rt} == *libclang_rt* ]]; then
+			use_compiler_rt=ON
+		fi
+	fi
+
+	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
+		-DPython3_EXECUTABLE="${PYTHON}"
+		-DLLVM_ENABLE_RUNTIMES="libunwind"
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+		-DLLVM_INCLUDE_TESTS=OFF
+		-DLIBUNWIND_ENABLE_ASSERTIONS=$(usex debug)
+		-DLIBUNWIND_ENABLE_STATIC=$(usex static-libs)
+		-DLIBUNWIND_INCLUDE_TESTS=$(usex test)
+		-DLIBUNWIND_INSTALL_HEADERS=ON
+
+		# support non-native unwinding; given it's small enough,
+		# enable it unconditionally
+		-DLIBUNWIND_ENABLE_CROSS_UNWINDING=ON
+
+		# avoid dependency on libgcc_s if compiler-rt is used
+		-DLIBUNWIND_USE_COMPILER_RT=${use_compiler_rt}
+	)
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_ENABLE_RUNTIMES="libunwind;libcxxabi;libcxx"
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+			-DLIBUNWIND_LIBCXX_PATH="${WORKDIR}/libcxx"
+
+			-DLIBCXXABI_LIBDIR_SUFFIX=
+			-DLIBCXXABI_ENABLE_SHARED=OFF
+			-DLIBCXXABI_ENABLE_STATIC=ON
+			-DLIBCXXABI_USE_LLVM_UNWINDER=ON
+			-DLIBCXXABI_INCLUDE_TESTS=OFF
+
+			-DLIBCXX_LIBDIR_SUFFIX=
+			-DLIBCXX_ENABLE_SHARED=OFF
+			-DLIBCXX_ENABLE_STATIC=ON
+			-DLIBCXX_CXX_ABI=libcxxabi
+			-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
+			-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
+			-DLIBCXX_HAS_GCC_S_LIB=OFF
+			-DLIBCXX_INCLUDE_TESTS=OFF
+			-DLIBCXX_INCLUDE_BENCHMARKS=OFF
+		)
+	fi
+
+	cmake_src_configure
+}
+
+multilib_src_test() {
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check-unwind
+}
+
+multilib_src_install() {
+	DESTDIR=${D} cmake_build install-unwind
+}
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-16.0.0.9999.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-16.0.0.9999.ebuild
index 2abe825b0946..70ee605d38b3 100644
--- a/sys-libs/llvm-libunwind/llvm-libunwind-16.0.0.9999.ebuild
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-16.0.0.9999.ebuild
@@ -69,6 +69,7 @@ multilib_src_configure() {
 	fi
 
 	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${CHOST}"
 		-DPython3_EXECUTABLE="${PYTHON}"
 		-DLLVM_ENABLE_RUNTIMES="libunwind"
 		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}