13 files changed, 984 insertions, 0 deletions
diff --git a/sys-libs/Manifest.gz b/sys-libs/Manifest.gz
index dc11bcf0f59a..9f28f9c4c042 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 470416077839..6e2b4a897420 100644
--- a/sys-libs/compiler-rt-sanitizers/Manifest
+++ b/sys-libs/compiler-rt-sanitizers/Manifest
@@ -9,6 +9,8 @@ DIST llvm-project-16.0.1.src.tar.xz 117990772 BLAKE2B 298189ce6d7245711e5bd3e03f
 DIST llvm-project-16.0.1.src.tar.xz.sig 566 BLAKE2B 06c03d789e63ab30bba4c56ba9ec91400d804448482d6a7fd395252b3b9166a5ee7a42a94c2074aa0d1809a3327f993d8932211f3fc05ad281db64c17b2a7094 SHA512 f42db28eb8280db06b1c78fa7a7aaea3a79499cecee1a64ce18c49b90c755b3a78fc93f01d1855887c7918ccc927c3b6147cfc916520f05d4cef65381ca6fe60
 DIST llvm-project-16.0.2.src.tar.xz 117995768 BLAKE2B b329b2b123428f3a966a96f074a75520f07d12fc13ec755403cff2346b23195e6a0c05ca9e789b4cf5b4b3557a922bd41d8dffb6056ee33fbbf2b81001511fae SHA512 4ca76aaaca8812a06a94071e7444a3213d85dca51ea86f6125f854776f69a3e088a92d0621e3911e526f280b35bfb778fb3742c6010d3ed1eba605c08720377c
 DIST llvm-project-16.0.2.src.tar.xz.sig 566 BLAKE2B 8243748ac27e4eec3cc011371e179e19f1005336f07d956fd358f649d1429c8d0ea22ecc376b1dec9fe3db971467ad1dd63e97bb089885d0e1994eeab26b6fd7 SHA512 dbe9367a259954a38f2369b2f226726162090227f1a5ae8c8809eaae47cad7b3b26c754633e6e5c54cacd6360a504d7ba4c659d9232c1648388d657a2aaad10c
+DIST llvm-project-16.0.3.src.tar.xz 117998136 BLAKE2B 6117586a117c30515e9a5623ab91d29ba65d33c8041274de0ecdbce08ae4fe1c8c3b120db9ca625f42fdbb2301537b4ffe8f7add701c178282be4f583fa0c8ca SHA512 2eb5eca1cbee92a499d7fba5729b61f31186353bc0545b17eefa300cf2b27c8d9a2f307443b2c1c9fe1b0ba412abf5143fdd4d25aaeb33d975a9a834221d7602
+DIST llvm-project-16.0.3.src.tar.xz.sig 566 BLAKE2B bbd96268b006fecffd7402452ae7559bd2ea42c7b771999f58893a48d66b1b056b476a7022c70e2ab8f11dba8318ccc141f97a05ece3b9ed3b4405a6890b0c3a SHA512 cdd5e1c2a252ba58f9b7f8687d6cf9a330c188988707bd72f4632a8158a2db9ac180b3936da99b87e7e99886c39cb8517ebbb04b7d1be198e76964e31ec8dc58
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-5c60a08c696c0420ddc5fdad5b8e50a7528cb3bf.tar.gz 182291041 BLAKE2B f5997611e0293df515d4494d14895cc8fbe22b536f5c419e4ad7d098acbf2b1046ceb332d865eacdae0b7fa1a77b78090551976835dd1b95b5270c9f6e12e410 SHA512 6cda8e55b4fc70e94838c772c56213c811affda96fb98a03d432348f995a313447d0e0e84533350e1fda3162d82633b260ccd8e3b1d59d3216187b44dc5556fb
 DIST llvm-project-5ea158077ec9ca50857ede5cbb0b27c61663fd55.tar.gz 182543024 BLAKE2B 32f5a9ddaa6c7e283d97256d7bd68634f2f8ed6d7167e743ba8076809ea1a3a7159f9ccc56a6e5a8838481cade07389669d8a35b17b5922da0cbef04c80131f8 SHA512 3d180c04ef39adbc9c6ee485e21cdf63fde362f0a22026b00a6d3eba6243e4c8e96fc088335f31051e54f4546d62569131a671d2e655ea735d597361f5732827
@@ -17,6 +19,7 @@ EBUILD compiler-rt-sanitizers-15.0.7.ebuild 6578 BLAKE2B 79b9477f9f426c7e5ffc07f
 EBUILD compiler-rt-sanitizers-16.0.1.ebuild 6550 BLAKE2B a3d856b59f3ad6ce433952a31081576c91576e764119720cf9af44dd54a1813f9f08da03c26cab7a4d00e8b44852197588b14eb52826419b353b44c926cf37bf SHA512 509c25c720fb1f4e3664491f41b23242dd24ba541cc319680cea6e0dc01bebe929af943281fe03473f49fff369b3021cc6abb0d5e6b8b1fd7fabc071961cdaa6
 EBUILD compiler-rt-sanitizers-16.0.2.ebuild 6550 BLAKE2B a3d856b59f3ad6ce433952a31081576c91576e764119720cf9af44dd54a1813f9f08da03c26cab7a4d00e8b44852197588b14eb52826419b353b44c926cf37bf SHA512 509c25c720fb1f4e3664491f41b23242dd24ba541cc319680cea6e0dc01bebe929af943281fe03473f49fff369b3021cc6abb0d5e6b8b1fd7fabc071961cdaa6
 EBUILD compiler-rt-sanitizers-16.0.3.9999.ebuild 6248 BLAKE2B 8548074a3b572bc5b19e9a70ed91225678172cb43b71ad501811d3741367c56f1ffe0e1b528934f620e7d8a30bd1fc463ada54113bea16c322f1d821a8503756 SHA512 8825b15e4965e58365a96517831120e1d5c02130f83cc1150b7a107142782cee74830d3dc0234453291d0f487789cd005303d47269381ad45356e4fd779decf5
+EBUILD compiler-rt-sanitizers-16.0.3.ebuild 6550 BLAKE2B a3d856b59f3ad6ce433952a31081576c91576e764119720cf9af44dd54a1813f9f08da03c26cab7a4d00e8b44852197588b14eb52826419b353b44c926cf37bf SHA512 509c25c720fb1f4e3664491f41b23242dd24ba541cc319680cea6e0dc01bebe929af943281fe03473f49fff369b3021cc6abb0d5e6b8b1fd7fabc071961cdaa6
 EBUILD compiler-rt-sanitizers-17.0.0.9999.ebuild 6249 BLAKE2B 036338e02f018bd9cb01036851fcee5af58f012e15c4fcb55a207e519d2b553e83f2871869681055a9c672b091126e95d52a1c50a605a94e27b866b22dd64732 SHA512 94a1deb4cbba26d0e1aa02333c2d3375349b059e1fe75f26368ab54d13b276c27ea377f4cce9b1cdf0a508add5ddae4886a59bbb24cd8bec61a7e5d03660746c
 EBUILD compiler-rt-sanitizers-17.0.0_pre20230325.ebuild 6248 BLAKE2B 8548074a3b572bc5b19e9a70ed91225678172cb43b71ad501811d3741367c56f1ffe0e1b528934f620e7d8a30bd1fc463ada54113bea16c322f1d821a8503756 SHA512 8825b15e4965e58365a96517831120e1d5c02130f83cc1150b7a107142782cee74830d3dc0234453291d0f487789cd005303d47269381ad45356e4fd779decf5
 EBUILD compiler-rt-sanitizers-17.0.0_pre20230414.ebuild 6248 BLAKE2B 8548074a3b572bc5b19e9a70ed91225678172cb43b71ad501811d3741367c56f1ffe0e1b528934f620e7d8a30bd1fc463ada54113bea16c322f1d821a8503756 SHA512 8825b15e4965e58365a96517831120e1d5c02130f83cc1150b7a107142782cee74830d3dc0234453291d0f487789cd005303d47269381ad45356e4fd779decf5
diff --git a/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-16.0.3.ebuild b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-16.0.3.ebuild
new file mode 100644
index 000000000000..d7d5778a3c8c
--- /dev/null
+++ b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-16.0.3.ebuild
@@ -0,0 +1,223 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{9..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="${LLVM_MAJOR}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc64 ~riscv ~x86 ~amd64-linux ~ppc-macos ~x64-macos"
+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="
+	|| ( ${SANITIZER_FLAGS[*]} libfuzzer orc profile xray )
+	test? (
+		cfi? ( ubsan )
+		gwp-asan? ( scudo )
+	)
+"
+RESTRICT="
+	!clang? ( test )
+	!test? ( test )
+"
+
+DEPEND="
+	sys-devel/llvm:${LLVM_MAJOR}
+	virtual/libcrypt[abi_x86_32(-)?,abi_x86_64(-)?]
+"
+BDEPEND="
+	>=dev-util/cmake-3.16
+	clang? ( sys-devel/clang )
+	elibc_glibc? ( net-libs/libtirpc )
+	test? (
+		$(python_gen_any_dep ">=dev-python/lit-15[\${PYTHON_USEDEP}]")
+		=sys-devel/clang-${LLVM_VERSION}*:${LLVM_MAJOR}
+		sys-libs/compiler-rt:${LLVM_MAJOR}
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+"
+
+LLVM_COMPONENTS=( compiler-rt cmake llvm/cmake )
+LLVM_TEST_COMPONENTS=( llvm/lib/Testing/Support third-party )
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	python_has_version ">=dev-python/lit-15[${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_MAX_SLOT=${LLVM_MAJOR} llvm_pkg_setup
+	python-any-r1_pkg_setup
+}
+
+src_prepare() {
+	sed -i -e 's:-Werror::' lib/tsan/go/buildgo.sh || die
+
+	local flag
+	for flag in "${SANITIZER_FLAGS[@]}"; do
+		if ! use "${flag}"; then
+			local cmake_flag=${flag/-/_}
+			sed -i -e "/COMPILER_RT_HAS_${cmake_flag^^}/s:TRUE:FALSE:" \
+				cmake/config-ix.cmake || die
+		fi
+	done
+
+	# TODO: fix these tests to be skipped upstream
+	if use asan && ! use profile; then
+		rm test/asan/TestCases/asan_and_llvm_coverage_test.cpp || die
+	fi
+	if use ubsan && ! use cfi; then
+		> test/cfi/CMakeLists.txt || die
+	fi
+
+	if has_version -b ">=sys-libs/glibc-2.37"; then
+		# known failures with glibc-2.37
+		# https://github.com/llvm/llvm-project/issues/60678
+		rm test/dfsan/custom.cpp || die
+		rm test/dfsan/release_shadow_space.c || die
+	fi
+
+	llvm.org_src_prepare
+}
+
+src_configure() {
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${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/${LLVM_MAJOR}"
+		# use a build dir structure consistent with install
+		# this makes it possible to easily deploy test-friendly clang
+		-DCOMPILER_RT_OUTPUT_DIR="${BUILD_DIR}/lib/clang/${LLVM_MAJOR}"
+
+		-DCOMPILER_RT_INCLUDE_TESTS=$(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=$(usex abi_x86_64)
+		)
+	fi
+
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+
+			# they are created during src_test()
+			-DCOMPILER_RT_TEST_COMPILER="${BUILD_DIR}/lib/llvm/${LLVM_MAJOR}/bin/clang"
+			-DCOMPILER_RT_TEST_CXX_COMPILER="${BUILD_DIR}/lib/llvm/${LLVM_MAJOR}/bin/clang++"
+		)
+
+		# same flags are passed for build & tests, so we need to strip
+		# them down to a subset supported by clang
+		CC=${EPREFIX}/usr/lib/llvm/${LLVM_MAJOR}/bin/clang \
+		CXX=${EPREFIX}/usr/lib/llvm/${LLVM_MAJOR}/bin/clang++ \
+		strip-unsupported-flags
+	fi
+
+	if use prefix && [[ "${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=( "${EPREFIX}"/usr/lib/clang/${LLVM_MAJOR}/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/${LLVM_MAJOR}/{bin,$(get_libdir)},clang/${LLVM_MAJOR}/include} || die
+		cp "${EPREFIX}"/usr/lib/llvm/${LLVM_MAJOR}/bin/clang{,++} \
+			"${BUILD_DIR}"/lib/llvm/${LLVM_MAJOR}/bin/ || die
+		cp "${EPREFIX}"/usr/lib/clang/${LLVM_MAJOR}/include/*.h \
+			"${BUILD_DIR}"/lib/clang/${LLVM_MAJOR}/include/ || die
+		cp "${sys_dir}"/*builtins*.a \
+			"${BUILD_DIR}/lib/clang/${LLVM_MAJOR}/lib/${sys_dir##*/}/" || die
+		# we also need LLVMgold.so for gold-based tests
+		if [[ -f ${EPREFIX}/usr/lib/llvm/${LLVM_MAJOR}/$(get_libdir)/LLVMgold.so ]]; then
+			ln -s "${EPREFIX}"/usr/lib/llvm/${LLVM_MAJOR}/$(get_libdir)/LLVMgold.so \
+				"${BUILD_DIR}"/lib/llvm/${LLVM_MAJOR}/$(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 7d07d972b90f..08bf22bc61b6 100644
--- a/sys-libs/compiler-rt/Manifest
+++ b/sys-libs/compiler-rt/Manifest
@@ -9,6 +9,8 @@ DIST llvm-project-16.0.1.src.tar.xz 117990772 BLAKE2B 298189ce6d7245711e5bd3e03f
 DIST llvm-project-16.0.1.src.tar.xz.sig 566 BLAKE2B 06c03d789e63ab30bba4c56ba9ec91400d804448482d6a7fd395252b3b9166a5ee7a42a94c2074aa0d1809a3327f993d8932211f3fc05ad281db64c17b2a7094 SHA512 f42db28eb8280db06b1c78fa7a7aaea3a79499cecee1a64ce18c49b90c755b3a78fc93f01d1855887c7918ccc927c3b6147cfc916520f05d4cef65381ca6fe60
 DIST llvm-project-16.0.2.src.tar.xz 117995768 BLAKE2B b329b2b123428f3a966a96f074a75520f07d12fc13ec755403cff2346b23195e6a0c05ca9e789b4cf5b4b3557a922bd41d8dffb6056ee33fbbf2b81001511fae SHA512 4ca76aaaca8812a06a94071e7444a3213d85dca51ea86f6125f854776f69a3e088a92d0621e3911e526f280b35bfb778fb3742c6010d3ed1eba605c08720377c
 DIST llvm-project-16.0.2.src.tar.xz.sig 566 BLAKE2B 8243748ac27e4eec3cc011371e179e19f1005336f07d956fd358f649d1429c8d0ea22ecc376b1dec9fe3db971467ad1dd63e97bb089885d0e1994eeab26b6fd7 SHA512 dbe9367a259954a38f2369b2f226726162090227f1a5ae8c8809eaae47cad7b3b26c754633e6e5c54cacd6360a504d7ba4c659d9232c1648388d657a2aaad10c
+DIST llvm-project-16.0.3.src.tar.xz 117998136 BLAKE2B 6117586a117c30515e9a5623ab91d29ba65d33c8041274de0ecdbce08ae4fe1c8c3b120db9ca625f42fdbb2301537b4ffe8f7add701c178282be4f583fa0c8ca SHA512 2eb5eca1cbee92a499d7fba5729b61f31186353bc0545b17eefa300cf2b27c8d9a2f307443b2c1c9fe1b0ba412abf5143fdd4d25aaeb33d975a9a834221d7602
+DIST llvm-project-16.0.3.src.tar.xz.sig 566 BLAKE2B bbd96268b006fecffd7402452ae7559bd2ea42c7b771999f58893a48d66b1b056b476a7022c70e2ab8f11dba8318ccc141f97a05ece3b9ed3b4405a6890b0c3a SHA512 cdd5e1c2a252ba58f9b7f8687d6cf9a330c188988707bd72f4632a8158a2db9ac180b3936da99b87e7e99886c39cb8517ebbb04b7d1be198e76964e31ec8dc58
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-5c60a08c696c0420ddc5fdad5b8e50a7528cb3bf.tar.gz 182291041 BLAKE2B f5997611e0293df515d4494d14895cc8fbe22b536f5c419e4ad7d098acbf2b1046ceb332d865eacdae0b7fa1a77b78090551976835dd1b95b5270c9f6e12e410 SHA512 6cda8e55b4fc70e94838c772c56213c811affda96fb98a03d432348f995a313447d0e0e84533350e1fda3162d82633b260ccd8e3b1d59d3216187b44dc5556fb
 DIST llvm-project-5ea158077ec9ca50857ede5cbb0b27c61663fd55.tar.gz 182543024 BLAKE2B 32f5a9ddaa6c7e283d97256d7bd68634f2f8ed6d7167e743ba8076809ea1a3a7159f9ccc56a6e5a8838481cade07389669d8a35b17b5922da0cbef04c80131f8 SHA512 3d180c04ef39adbc9c6ee485e21cdf63fde362f0a22026b00a6d3eba6243e4c8e96fc088335f31051e54f4546d62569131a671d2e655ea735d597361f5732827
@@ -17,6 +19,7 @@ EBUILD compiler-rt-15.0.7.ebuild 4260 BLAKE2B ae8a86217b480bab08dc99d4c5a648bf99
 EBUILD compiler-rt-16.0.1.ebuild 4244 BLAKE2B b4fa336d5147d1f452cfe2d423d86a7d3c61747c537c7ad6d3925c0f8cb375e63a7ca3a233504f246bba3e8571552ee575852ef9d14c4f7386078d89bbda0f90 SHA512 f41f64f6bce1331285993ce6542fca86ae5e8fbe6bf2ebbd7b5393fef8916125efb571d4272d64f25667592f04783992b43feb241d64d3186ceab38a686eb75d
 EBUILD compiler-rt-16.0.2.ebuild 4244 BLAKE2B b4fa336d5147d1f452cfe2d423d86a7d3c61747c537c7ad6d3925c0f8cb375e63a7ca3a233504f246bba3e8571552ee575852ef9d14c4f7386078d89bbda0f90 SHA512 f41f64f6bce1331285993ce6542fca86ae5e8fbe6bf2ebbd7b5393fef8916125efb571d4272d64f25667592f04783992b43feb241d64d3186ceab38a686eb75d
 EBUILD compiler-rt-16.0.3.9999.ebuild 4165 BLAKE2B 5c1747ed91de0ac5c023f933703fabc2e226f025f8794e09db976b941241c068bb0b241bf9ef6514f01ac2a5642556be7635ddc640710c106c1be10ad3d6241d SHA512 8b293590412b9781aac94517a9e3843d3d08eb20e125fbed48cd28b64acb1cf41087084f652c0e01921ee90509ee2fc3f9ff1a7c6cf6958e82859005559e2573
+EBUILD compiler-rt-16.0.3.ebuild 4244 BLAKE2B b4fa336d5147d1f452cfe2d423d86a7d3c61747c537c7ad6d3925c0f8cb375e63a7ca3a233504f246bba3e8571552ee575852ef9d14c4f7386078d89bbda0f90 SHA512 f41f64f6bce1331285993ce6542fca86ae5e8fbe6bf2ebbd7b5393fef8916125efb571d4272d64f25667592f04783992b43feb241d64d3186ceab38a686eb75d
 EBUILD compiler-rt-17.0.0.9999.ebuild 4166 BLAKE2B cd26aafb9d796d914dd260347378d57ae3e94594a9f204a866bdd3ad261794c0b04e7caff1d0182fb9f4e462dbbc15132106c0118dfdec9b61adce7732da40d7 SHA512 68218eef7361276b938f7b3d5e44483337bdcd988c7dc8abccfa8b56501b6e8cfb6395b6054bbc69972cc3d5b238627ade3715bf9d9853f43b0e1152d6fee41a
 EBUILD compiler-rt-17.0.0_pre20230325.ebuild 4165 BLAKE2B 5c1747ed91de0ac5c023f933703fabc2e226f025f8794e09db976b941241c068bb0b241bf9ef6514f01ac2a5642556be7635ddc640710c106c1be10ad3d6241d SHA512 8b293590412b9781aac94517a9e3843d3d08eb20e125fbed48cd28b64acb1cf41087084f652c0e01921ee90509ee2fc3f9ff1a7c6cf6958e82859005559e2573
 EBUILD compiler-rt-17.0.0_pre20230414.ebuild 4165 BLAKE2B 5c1747ed91de0ac5c023f933703fabc2e226f025f8794e09db976b941241c068bb0b241bf9ef6514f01ac2a5642556be7635ddc640710c106c1be10ad3d6241d SHA512 8b293590412b9781aac94517a9e3843d3d08eb20e125fbed48cd28b64acb1cf41087084f652c0e01921ee90509ee2fc3f9ff1a7c6cf6958e82859005559e2573
diff --git a/sys-libs/compiler-rt/compiler-rt-16.0.3.ebuild b/sys-libs/compiler-rt/compiler-rt-16.0.3.ebuild
new file mode 100644
index 000000000000..49b92c7f0e51
--- /dev/null
+++ b/sys-libs/compiler-rt/compiler-rt-16.0.3.ebuild
@@ -0,0 +1,149 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{9..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="${LLVM_MAJOR}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc64 ~riscv ~x86 ~amd64-linux ~ppc-macos ~x64-macos"
+IUSE="+abi_x86_32 abi_x86_64 +clang debug test"
+RESTRICT="!test? ( test ) !clang? ( test )"
+
+DEPEND="
+	sys-devel/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	>=dev-util/cmake-3.16
+	clang? ( sys-devel/clang )
+	test? (
+		$(python_gen_any_dep ">=dev-python/lit-15[\${PYTHON_USEDEP}]")
+		=sys-devel/clang-${LLVM_VERSION}*:${LLVM_MAJOR}
+	)
+	!test? (
+		${PYTHON_DEPS}
+	)
+"
+
+LLVM_COMPONENTS=( compiler-rt cmake llvm/cmake )
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	python_has_version ">=dev-python/lit-15[${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 [[ ${CHOST} != *-darwin* ]] || has_version sys-devel/llvm; then
+		LLVM_MAX_SLOT=${LLVM_MAJOR} 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,
+			# and set available entry symbol for bug #862798.
+			nolib_flags+=( -nostartfiles -emain )
+
+			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/${LLVM_MAJOR}"
+
+		-DCOMPILER_RT_INCLUDE_TESTS=$(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="${EPREFIX}/usr/lib/llvm/${LLVM_MAJOR}/bin/clang"
+			-DCOMPILER_RT_TEST_CXX_COMPILER="${EPREFIX}/usr/lib/llvm/${LLVM_MAJOR}/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 7e5477246602..be8acad25b2d 100644
--- a/sys-libs/libcxx/Manifest
+++ b/sys-libs/libcxx/Manifest
@@ -9,6 +9,8 @@ DIST llvm-project-16.0.1.src.tar.xz 117990772 BLAKE2B 298189ce6d7245711e5bd3e03f
 DIST llvm-project-16.0.1.src.tar.xz.sig 566 BLAKE2B 06c03d789e63ab30bba4c56ba9ec91400d804448482d6a7fd395252b3b9166a5ee7a42a94c2074aa0d1809a3327f993d8932211f3fc05ad281db64c17b2a7094 SHA512 f42db28eb8280db06b1c78fa7a7aaea3a79499cecee1a64ce18c49b90c755b3a78fc93f01d1855887c7918ccc927c3b6147cfc916520f05d4cef65381ca6fe60
 DIST llvm-project-16.0.2.src.tar.xz 117995768 BLAKE2B b329b2b123428f3a966a96f074a75520f07d12fc13ec755403cff2346b23195e6a0c05ca9e789b4cf5b4b3557a922bd41d8dffb6056ee33fbbf2b81001511fae SHA512 4ca76aaaca8812a06a94071e7444a3213d85dca51ea86f6125f854776f69a3e088a92d0621e3911e526f280b35bfb778fb3742c6010d3ed1eba605c08720377c
 DIST llvm-project-16.0.2.src.tar.xz.sig 566 BLAKE2B 8243748ac27e4eec3cc011371e179e19f1005336f07d956fd358f649d1429c8d0ea22ecc376b1dec9fe3db971467ad1dd63e97bb089885d0e1994eeab26b6fd7 SHA512 dbe9367a259954a38f2369b2f226726162090227f1a5ae8c8809eaae47cad7b3b26c754633e6e5c54cacd6360a504d7ba4c659d9232c1648388d657a2aaad10c
+DIST llvm-project-16.0.3.src.tar.xz 117998136 BLAKE2B 6117586a117c30515e9a5623ab91d29ba65d33c8041274de0ecdbce08ae4fe1c8c3b120db9ca625f42fdbb2301537b4ffe8f7add701c178282be4f583fa0c8ca SHA512 2eb5eca1cbee92a499d7fba5729b61f31186353bc0545b17eefa300cf2b27c8d9a2f307443b2c1c9fe1b0ba412abf5143fdd4d25aaeb33d975a9a834221d7602
+DIST llvm-project-16.0.3.src.tar.xz.sig 566 BLAKE2B bbd96268b006fecffd7402452ae7559bd2ea42c7b771999f58893a48d66b1b056b476a7022c70e2ab8f11dba8318ccc141f97a05ece3b9ed3b4405a6890b0c3a SHA512 cdd5e1c2a252ba58f9b7f8687d6cf9a330c188988707bd72f4632a8158a2db9ac180b3936da99b87e7e99886c39cb8517ebbb04b7d1be198e76964e31ec8dc58
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-5c60a08c696c0420ddc5fdad5b8e50a7528cb3bf.tar.gz 182291041 BLAKE2B f5997611e0293df515d4494d14895cc8fbe22b536f5c419e4ad7d098acbf2b1046ceb332d865eacdae0b7fa1a77b78090551976835dd1b95b5270c9f6e12e410 SHA512 6cda8e55b4fc70e94838c772c56213c811affda96fb98a03d432348f995a313447d0e0e84533350e1fda3162d82633b260ccd8e3b1d59d3216187b44dc5556fb
 DIST llvm-project-5ea158077ec9ca50857ede5cbb0b27c61663fd55.tar.gz 182543024 BLAKE2B 32f5a9ddaa6c7e283d97256d7bd68634f2f8ed6d7167e743ba8076809ea1a3a7159f9ccc56a6e5a8838481cade07389669d8a35b17b5922da0cbef04c80131f8 SHA512 3d180c04ef39adbc9c6ee485e21cdf63fde362f0a22026b00a6d3eba6243e4c8e96fc088335f31051e54f4546d62569131a671d2e655ea735d597361f5732827
@@ -18,6 +20,7 @@ EBUILD libcxx-15.0.7.ebuild 5282 BLAKE2B 9c1dc8c9ac37ecad2c31231d04068fc60d29df7
 EBUILD libcxx-16.0.1.ebuild 5294 BLAKE2B 83f9a04af5773a5dcf9f0ba430684e2527695b9b41b8f704a779abb2a9e74060c8450e888f0ccc89bd5befdb32a93706ad2cb82ba309792a1f79297d8a9315d9 SHA512 deed56905f464c6b0baca63585753dbf8975fd2db72493ff8adda9a4ed8cdcb4ca3ef7fcdea6227d6680dca949963f438aaa36947e9045e98a582813eec4defc
 EBUILD libcxx-16.0.2.ebuild 5294 BLAKE2B 83f9a04af5773a5dcf9f0ba430684e2527695b9b41b8f704a779abb2a9e74060c8450e888f0ccc89bd5befdb32a93706ad2cb82ba309792a1f79297d8a9315d9 SHA512 deed56905f464c6b0baca63585753dbf8975fd2db72493ff8adda9a4ed8cdcb4ca3ef7fcdea6227d6680dca949963f438aaa36947e9045e98a582813eec4defc
 EBUILD libcxx-16.0.3.9999.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
+EBUILD libcxx-16.0.3.ebuild 5294 BLAKE2B 83f9a04af5773a5dcf9f0ba430684e2527695b9b41b8f704a779abb2a9e74060c8450e888f0ccc89bd5befdb32a93706ad2cb82ba309792a1f79297d8a9315d9 SHA512 deed56905f464c6b0baca63585753dbf8975fd2db72493ff8adda9a4ed8cdcb4ca3ef7fcdea6227d6680dca949963f438aaa36947e9045e98a582813eec4defc
 EBUILD libcxx-17.0.0.9999.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
 EBUILD libcxx-17.0.0_pre20230325.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
 EBUILD libcxx-17.0.0_pre20230414.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
diff --git a/sys-libs/libcxx/libcxx-16.0.3.ebuild b/sys-libs/libcxx/libcxx-16.0.3.ebuild
new file mode 100644
index 000000000000..cdbee6be92d6
--- /dev/null
+++ b/sys-libs/libcxx/libcxx-16.0.3.ebuild
@@ -0,0 +1,204 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{9..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="~amd64 ~arm ~arm64 ~loong ~riscv ~sparc ~x86 ~x64-macos"
+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] )
+"
+DEPEND="
+	${RDEPEND}
+	sys-devel/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	clang? (
+		sys-devel/clang:${LLVM_MAJOR}
+	)
+	!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.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	python_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 [[ ${CHOST} != *-darwin* ]] || has_version sys-devel/llvm; then
+		LLVM_MAX_SLOT=${LLVM_MAJOR} 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; then
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
+
+	# bootstrap: cmake is unhappy if compiler can't link to stdlib
+	local nolib_flags=( -nodefaultlibs -lc )
+	if ! test_compiler; then
+		if test_compiler "${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=${use_compiler_rt}
+	)
+
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${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
+}
diff --git a/sys-libs/libcxxabi/Manifest b/sys-libs/libcxxabi/Manifest
index a36756a01a29..9e5e5de48631 100644
--- a/sys-libs/libcxxabi/Manifest
+++ b/sys-libs/libcxxabi/Manifest
@@ -7,6 +7,8 @@ DIST llvm-project-16.0.1.src.tar.xz 117990772 BLAKE2B 298189ce6d7245711e5bd3e03f
 DIST llvm-project-16.0.1.src.tar.xz.sig 566 BLAKE2B 06c03d789e63ab30bba4c56ba9ec91400d804448482d6a7fd395252b3b9166a5ee7a42a94c2074aa0d1809a3327f993d8932211f3fc05ad281db64c17b2a7094 SHA512 f42db28eb8280db06b1c78fa7a7aaea3a79499cecee1a64ce18c49b90c755b3a78fc93f01d1855887c7918ccc927c3b6147cfc916520f05d4cef65381ca6fe60
 DIST llvm-project-16.0.2.src.tar.xz 117995768 BLAKE2B b329b2b123428f3a966a96f074a75520f07d12fc13ec755403cff2346b23195e6a0c05ca9e789b4cf5b4b3557a922bd41d8dffb6056ee33fbbf2b81001511fae SHA512 4ca76aaaca8812a06a94071e7444a3213d85dca51ea86f6125f854776f69a3e088a92d0621e3911e526f280b35bfb778fb3742c6010d3ed1eba605c08720377c
 DIST llvm-project-16.0.2.src.tar.xz.sig 566 BLAKE2B 8243748ac27e4eec3cc011371e179e19f1005336f07d956fd358f649d1429c8d0ea22ecc376b1dec9fe3db971467ad1dd63e97bb089885d0e1994eeab26b6fd7 SHA512 dbe9367a259954a38f2369b2f226726162090227f1a5ae8c8809eaae47cad7b3b26c754633e6e5c54cacd6360a504d7ba4c659d9232c1648388d657a2aaad10c
+DIST llvm-project-16.0.3.src.tar.xz 117998136 BLAKE2B 6117586a117c30515e9a5623ab91d29ba65d33c8041274de0ecdbce08ae4fe1c8c3b120db9ca625f42fdbb2301537b4ffe8f7add701c178282be4f583fa0c8ca SHA512 2eb5eca1cbee92a499d7fba5729b61f31186353bc0545b17eefa300cf2b27c8d9a2f307443b2c1c9fe1b0ba412abf5143fdd4d25aaeb33d975a9a834221d7602
+DIST llvm-project-16.0.3.src.tar.xz.sig 566 BLAKE2B bbd96268b006fecffd7402452ae7559bd2ea42c7b771999f58893a48d66b1b056b476a7022c70e2ab8f11dba8318ccc141f97a05ece3b9ed3b4405a6890b0c3a SHA512 cdd5e1c2a252ba58f9b7f8687d6cf9a330c188988707bd72f4632a8158a2db9ac180b3936da99b87e7e99886c39cb8517ebbb04b7d1be198e76964e31ec8dc58
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-5c60a08c696c0420ddc5fdad5b8e50a7528cb3bf.tar.gz 182291041 BLAKE2B f5997611e0293df515d4494d14895cc8fbe22b536f5c419e4ad7d098acbf2b1046ceb332d865eacdae0b7fa1a77b78090551976835dd1b95b5270c9f6e12e410 SHA512 6cda8e55b4fc70e94838c772c56213c811affda96fb98a03d432348f995a313447d0e0e84533350e1fda3162d82633b260ccd8e3b1d59d3216187b44dc5556fb
 DIST llvm-project-5ea158077ec9ca50857ede5cbb0b27c61663fd55.tar.gz 182543024 BLAKE2B 32f5a9ddaa6c7e283d97256d7bd68634f2f8ed6d7167e743ba8076809ea1a3a7159f9ccc56a6e5a8838481cade07389669d8a35b17b5922da0cbef04c80131f8 SHA512 3d180c04ef39adbc9c6ee485e21cdf63fde362f0a22026b00a6d3eba6243e4c8e96fc088335f31051e54f4546d62569131a671d2e655ea735d597361f5732827
@@ -15,6 +17,7 @@ EBUILD libcxxabi-15.0.7.ebuild 2910 BLAKE2B 0384b9de395b7725422b07d31439af21c120
 EBUILD libcxxabi-16.0.1.ebuild 2922 BLAKE2B deb13575bf9827c2e53b9e9d6179c4cb1db4f6e2a2ab63455a6170883f10c2a2acffd82089e4465f3b07794d16bd81f58edc675a9b5a14a0d3423cc1854b4c57 SHA512 46352684087b70b767fa241510318432491f9aad1f9ea83059093f2ed7af8d61e24884a4958f7008f27ef6735de109084b3b28c8f83db31b6f0cd2830f9480e6
 EBUILD libcxxabi-16.0.2.ebuild 2922 BLAKE2B deb13575bf9827c2e53b9e9d6179c4cb1db4f6e2a2ab63455a6170883f10c2a2acffd82089e4465f3b07794d16bd81f58edc675a9b5a14a0d3423cc1854b4c57 SHA512 46352684087b70b767fa241510318432491f9aad1f9ea83059093f2ed7af8d61e24884a4958f7008f27ef6735de109084b3b28c8f83db31b6f0cd2830f9480e6
 EBUILD libcxxabi-16.0.3.9999.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
+EBUILD libcxxabi-16.0.3.ebuild 2922 BLAKE2B deb13575bf9827c2e53b9e9d6179c4cb1db4f6e2a2ab63455a6170883f10c2a2acffd82089e4465f3b07794d16bd81f58edc675a9b5a14a0d3423cc1854b4c57 SHA512 46352684087b70b767fa241510318432491f9aad1f9ea83059093f2ed7af8d61e24884a4958f7008f27ef6735de109084b3b28c8f83db31b6f0cd2830f9480e6
 EBUILD libcxxabi-17.0.0.9999.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
 EBUILD libcxxabi-17.0.0_pre20230325.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
 EBUILD libcxxabi-17.0.0_pre20230414.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
diff --git a/sys-libs/libcxxabi/libcxxabi-16.0.3.ebuild b/sys-libs/libcxxabi/libcxxabi-16.0.3.ebuild
new file mode 100644
index 000000000000..e5d488bf1341
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-16.0.3.ebuild
@@ -0,0 +1,116 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{9..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="~amd64 ~arm ~arm64 ~loong ~riscv ~sparc ~x86 ~x64-macos"
+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
+"
+DEPEND="
+	${RDEPEND}
+	sys-devel/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	clang? (
+		sys-devel/clang:${LLVM_MAJOR}
+	)
+	!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
+	python_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 [[ ${CHOST} != *-darwin* ]] || has_version sys-devel/llvm; then
+		LLVM_MAX_SLOT=${LLVM_MAJOR} llvm_pkg_setup
+	fi
+	python-any-r1_pkg_setup
+}
+
+multilib_src_configure() {
+	if use clang; then
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
+
+	local libdir=$(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=$(usex test)
+		-DLIBCXXABI_USE_COMPILER_RT=${use_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
+		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 14225f390eb3..ac5aaa4551a1 100644
--- a/sys-libs/libomp/Manifest
+++ b/sys-libs/libomp/Manifest
@@ -9,6 +9,8 @@ DIST llvm-project-16.0.1.src.tar.xz 117990772 BLAKE2B 298189ce6d7245711e5bd3e03f
 DIST llvm-project-16.0.1.src.tar.xz.sig 566 BLAKE2B 06c03d789e63ab30bba4c56ba9ec91400d804448482d6a7fd395252b3b9166a5ee7a42a94c2074aa0d1809a3327f993d8932211f3fc05ad281db64c17b2a7094 SHA512 f42db28eb8280db06b1c78fa7a7aaea3a79499cecee1a64ce18c49b90c755b3a78fc93f01d1855887c7918ccc927c3b6147cfc916520f05d4cef65381ca6fe60
 DIST llvm-project-16.0.2.src.tar.xz 117995768 BLAKE2B b329b2b123428f3a966a96f074a75520f07d12fc13ec755403cff2346b23195e6a0c05ca9e789b4cf5b4b3557a922bd41d8dffb6056ee33fbbf2b81001511fae SHA512 4ca76aaaca8812a06a94071e7444a3213d85dca51ea86f6125f854776f69a3e088a92d0621e3911e526f280b35bfb778fb3742c6010d3ed1eba605c08720377c
 DIST llvm-project-16.0.2.src.tar.xz.sig 566 BLAKE2B 8243748ac27e4eec3cc011371e179e19f1005336f07d956fd358f649d1429c8d0ea22ecc376b1dec9fe3db971467ad1dd63e97bb089885d0e1994eeab26b6fd7 SHA512 dbe9367a259954a38f2369b2f226726162090227f1a5ae8c8809eaae47cad7b3b26c754633e6e5c54cacd6360a504d7ba4c659d9232c1648388d657a2aaad10c
+DIST llvm-project-16.0.3.src.tar.xz 117998136 BLAKE2B 6117586a117c30515e9a5623ab91d29ba65d33c8041274de0ecdbce08ae4fe1c8c3b120db9ca625f42fdbb2301537b4ffe8f7add701c178282be4f583fa0c8ca SHA512 2eb5eca1cbee92a499d7fba5729b61f31186353bc0545b17eefa300cf2b27c8d9a2f307443b2c1c9fe1b0ba412abf5143fdd4d25aaeb33d975a9a834221d7602
+DIST llvm-project-16.0.3.src.tar.xz.sig 566 BLAKE2B bbd96268b006fecffd7402452ae7559bd2ea42c7b771999f58893a48d66b1b056b476a7022c70e2ab8f11dba8318ccc141f97a05ece3b9ed3b4405a6890b0c3a SHA512 cdd5e1c2a252ba58f9b7f8687d6cf9a330c188988707bd72f4632a8158a2db9ac180b3936da99b87e7e99886c39cb8517ebbb04b7d1be198e76964e31ec8dc58
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-5c60a08c696c0420ddc5fdad5b8e50a7528cb3bf.tar.gz 182291041 BLAKE2B f5997611e0293df515d4494d14895cc8fbe22b536f5c419e4ad7d098acbf2b1046ceb332d865eacdae0b7fa1a77b78090551976835dd1b95b5270c9f6e12e410 SHA512 6cda8e55b4fc70e94838c772c56213c811affda96fb98a03d432348f995a313447d0e0e84533350e1fda3162d82633b260ccd8e3b1d59d3216187b44dc5556fb
 DIST llvm-project-5ea158077ec9ca50857ede5cbb0b27c61663fd55.tar.gz 182543024 BLAKE2B 32f5a9ddaa6c7e283d97256d7bd68634f2f8ed6d7167e743ba8076809ea1a3a7159f9ccc56a6e5a8838481cade07389669d8a35b17b5922da0cbef04c80131f8 SHA512 3d180c04ef39adbc9c6ee485e21cdf63fde362f0a22026b00a6d3eba6243e4c8e96fc088335f31051e54f4546d62569131a671d2e655ea735d597361f5732827
@@ -17,6 +19,7 @@ EBUILD libomp-15.0.7-r2.ebuild 3474 BLAKE2B c75fddce61b7e8fe837b4c5bc1b7dacfbe4b
 EBUILD libomp-16.0.1.ebuild 3993 BLAKE2B 12ea9bf058a78f1a4439ee65528a592b0fed0a1234e3c318a748f9bf8e520763c7ffda28719f00abbb01fb1a77798f1094ed48fc344d1ea12999a0bbe60a8675 SHA512 b517da1c7c983f21969377852743b5015f6ea86ec078f330d100c8a5bc39de6ee0aa488a15f1702ea765a958ec9ea8903226d81a3ba154273cfa8a5e615cb3b5
 EBUILD libomp-16.0.2.ebuild 3993 BLAKE2B 12ea9bf058a78f1a4439ee65528a592b0fed0a1234e3c318a748f9bf8e520763c7ffda28719f00abbb01fb1a77798f1094ed48fc344d1ea12999a0bbe60a8675 SHA512 b517da1c7c983f21969377852743b5015f6ea86ec078f330d100c8a5bc39de6ee0aa488a15f1702ea765a958ec9ea8903226d81a3ba154273cfa8a5e615cb3b5
 EBUILD libomp-16.0.3.9999.ebuild 3920 BLAKE2B f128f041db9ab95beed986fad4fce1d70d30688dff973aa15a1ffb268f248ade667da316effe8de491d836bebc289a30a691910d1159c7a2563cbaad42f1bfbc SHA512 56a8a37f77c4690041fa9d274b3b52a5cc41588e02961b157f078adafe882bf66957d4d729037baf25f1257a0cb2af5f83e432c2d214234cf6942bf31eb7bd9d
+EBUILD libomp-16.0.3.ebuild 3993 BLAKE2B 12ea9bf058a78f1a4439ee65528a592b0fed0a1234e3c318a748f9bf8e520763c7ffda28719f00abbb01fb1a77798f1094ed48fc344d1ea12999a0bbe60a8675 SHA512 b517da1c7c983f21969377852743b5015f6ea86ec078f330d100c8a5bc39de6ee0aa488a15f1702ea765a958ec9ea8903226d81a3ba154273cfa8a5e615cb3b5
 EBUILD libomp-17.0.0.9999.ebuild 3921 BLAKE2B 2aa5aa2719a4f9a7f244cd92fb819d0fafc81d7f806d1b295c583159e0884c14c04bf1188d8c9e315c4cd2e1d3940311cd4e80f03e501958cd3b38e1c0567ab9 SHA512 c6f7bbf7296b24154a170c47044851c7331564af58cdca813ac13903535e49438c9165c8c811e72ad18e0a2db4e890f9dce163f6f07b0b1d60a473e455402b00
 EBUILD libomp-17.0.0_pre20230325.ebuild 3920 BLAKE2B f128f041db9ab95beed986fad4fce1d70d30688dff973aa15a1ffb268f248ade667da316effe8de491d836bebc289a30a691910d1159c7a2563cbaad42f1bfbc SHA512 56a8a37f77c4690041fa9d274b3b52a5cc41588e02961b157f078adafe882bf66957d4d729037baf25f1257a0cb2af5f83e432c2d214234cf6942bf31eb7bd9d
 EBUILD libomp-17.0.0_pre20230414.ebuild 3920 BLAKE2B f128f041db9ab95beed986fad4fce1d70d30688dff973aa15a1ffb268f248ade667da316effe8de491d836bebc289a30a691910d1159c7a2563cbaad42f1bfbc SHA512 56a8a37f77c4690041fa9d274b3b52a5cc41588e02961b157f078adafe882bf66957d4d729037baf25f1257a0cb2af5f83e432c2d214234cf6942bf31eb7bd9d
diff --git a/sys-libs/libomp/libomp-16.0.3.ebuild b/sys-libs/libomp/libomp-16.0.3.ebuild
new file mode 100644
index 000000000000..72038b861daa
--- /dev/null
+++ b/sys-libs/libomp/libomp-16.0.3.ebuild
@@ -0,0 +1,151 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{9..11} )
+inherit flag-o-matic cmake-multilib linux-info llvm llvm.org
+inherit python-single-r1 toolchain-funcs
+
+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/${LLVM_SOABI}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~x86 ~amd64-linux ~x64-macos"
+IUSE="
+	debug gdb-plugin hwloc offload ompt test
+	llvm_targets_AMDGPU llvm_targets_NVPTX
+"
+REQUIRED_USE="
+	gdb-plugin? ( ${PYTHON_REQUIRED_USE} )
+"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	gdb-plugin? ( ${PYTHON_DEPS} )
+	hwloc? ( >=sys-apps/hwloc-2.5:0=[${MULTILIB_USEDEP}] )
+	offload? (
+		dev-libs/libffi:=[${MULTILIB_USEDEP}]
+		~sys-devel/llvm-${PV}[${MULTILIB_USEDEP}]
+		llvm_targets_AMDGPU? ( dev-libs/rocr-runtime:= )
+	)
+"
+# 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_DEPS}
+		$(python_gen_cond_dep '
+			dev-python/lit[${PYTHON_USEDEP}]
+		')
+		sys-devel/clang
+	)
+"
+
+LLVM_COMPONENTS=( openmp cmake llvm/include )
+llvm.org_set_globals
+
+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=${LLVM_MAJOR} llvm_pkg_setup
+	if use gdb-plugin || use test; then
+		python-single-r1_pkg_setup
+	fi
+}
+
+multilib_src_configure() {
+	# LTO causes issues in other packages building, #870127
+	filter-lto
+
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+
+	local build_omptarget=OFF
+	# upstream disallows building libomptarget when sizeof(void*) != 8
+	if use offload &&
+		"$(tc-getCC)" ${CFLAGS} ${CPPFLAGS} -c -x c - -o /dev/null \
+		<<-EOF &>/dev/null
+			int test[sizeof(void *) == 8 ? 1 : -1];
+		EOF
+	then
+		build_omptarget=ON
+	fi
+
+	local libdir="$(get_libdir)"
+	local mycmakeargs=(
+		-DOPENMP_LIBDIR_SUFFIX="${libdir#lib}"
+
+		-DLIBOMP_USE_HWLOC=$(usex hwloc)
+		-DLIBOMP_OMPD_GDB_SUPPORT=$(multilib_native_usex gdb-plugin)
+		-DLIBOMP_OMPT_SUPPORT=$(usex ompt)
+
+		-DOPENMP_ENABLE_LIBOMPTARGET=${build_omptarget}
+
+		# do not install libgomp.so & libiomp5.so aliases
+		-DLIBOMP_INSTALL_ALIASES=OFF
+		# disable unnecessary hack copying stuff back to srcdir
+		-DLIBOMP_COPY_EXPORTS=OFF
+		# prevent trying to access the GPU
+		-DLIBOMPTARGET_AMDGPU_ARCH=LIBOMPTARGET_AMDGPU_ARCH-NOTFOUND
+	)
+
+	if [[ ${build_omptarget} == ON ]]; then
+		if has "${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 fb0b8e509527..51e66fc1c963 100644
--- a/sys-libs/llvm-libunwind/Manifest
+++ b/sys-libs/llvm-libunwind/Manifest
@@ -7,6 +7,8 @@ DIST llvm-project-16.0.1.src.tar.xz 117990772 BLAKE2B 298189ce6d7245711e5bd3e03f
 DIST llvm-project-16.0.1.src.tar.xz.sig 566 BLAKE2B 06c03d789e63ab30bba4c56ba9ec91400d804448482d6a7fd395252b3b9166a5ee7a42a94c2074aa0d1809a3327f993d8932211f3fc05ad281db64c17b2a7094 SHA512 f42db28eb8280db06b1c78fa7a7aaea3a79499cecee1a64ce18c49b90c755b3a78fc93f01d1855887c7918ccc927c3b6147cfc916520f05d4cef65381ca6fe60
 DIST llvm-project-16.0.2.src.tar.xz 117995768 BLAKE2B b329b2b123428f3a966a96f074a75520f07d12fc13ec755403cff2346b23195e6a0c05ca9e789b4cf5b4b3557a922bd41d8dffb6056ee33fbbf2b81001511fae SHA512 4ca76aaaca8812a06a94071e7444a3213d85dca51ea86f6125f854776f69a3e088a92d0621e3911e526f280b35bfb778fb3742c6010d3ed1eba605c08720377c
 DIST llvm-project-16.0.2.src.tar.xz.sig 566 BLAKE2B 8243748ac27e4eec3cc011371e179e19f1005336f07d956fd358f649d1429c8d0ea22ecc376b1dec9fe3db971467ad1dd63e97bb089885d0e1994eeab26b6fd7 SHA512 dbe9367a259954a38f2369b2f226726162090227f1a5ae8c8809eaae47cad7b3b26c754633e6e5c54cacd6360a504d7ba4c659d9232c1648388d657a2aaad10c
+DIST llvm-project-16.0.3.src.tar.xz 117998136 BLAKE2B 6117586a117c30515e9a5623ab91d29ba65d33c8041274de0ecdbce08ae4fe1c8c3b120db9ca625f42fdbb2301537b4ffe8f7add701c178282be4f583fa0c8ca SHA512 2eb5eca1cbee92a499d7fba5729b61f31186353bc0545b17eefa300cf2b27c8d9a2f307443b2c1c9fe1b0ba412abf5143fdd4d25aaeb33d975a9a834221d7602
+DIST llvm-project-16.0.3.src.tar.xz.sig 566 BLAKE2B bbd96268b006fecffd7402452ae7559bd2ea42c7b771999f58893a48d66b1b056b476a7022c70e2ab8f11dba8318ccc141f97a05ece3b9ed3b4405a6890b0c3a SHA512 cdd5e1c2a252ba58f9b7f8687d6cf9a330c188988707bd72f4632a8158a2db9ac180b3936da99b87e7e99886c39cb8517ebbb04b7d1be198e76964e31ec8dc58
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-5c60a08c696c0420ddc5fdad5b8e50a7528cb3bf.tar.gz 182291041 BLAKE2B f5997611e0293df515d4494d14895cc8fbe22b536f5c419e4ad7d098acbf2b1046ceb332d865eacdae0b7fa1a77b78090551976835dd1b95b5270c9f6e12e410 SHA512 6cda8e55b4fc70e94838c772c56213c811affda96fb98a03d432348f995a313447d0e0e84533350e1fda3162d82633b260ccd8e3b1d59d3216187b44dc5556fb
 DIST llvm-project-5ea158077ec9ca50857ede5cbb0b27c61663fd55.tar.gz 182543024 BLAKE2B 32f5a9ddaa6c7e283d97256d7bd68634f2f8ed6d7167e743ba8076809ea1a3a7159f9ccc56a6e5a8838481cade07389669d8a35b17b5922da0cbef04c80131f8 SHA512 3d180c04ef39adbc9c6ee485e21cdf63fde362f0a22026b00a6d3eba6243e4c8e96fc088335f31051e54f4546d62569131a671d2e655ea735d597361f5732827
@@ -15,6 +17,7 @@ EBUILD llvm-libunwind-15.0.7.ebuild 3032 BLAKE2B 9b47e894db1a764f3eca3135f4caba6
 EBUILD llvm-libunwind-16.0.1.ebuild 3045 BLAKE2B e0704cc1c6a743ecd3c073df9456f7a549896a9992083ee650803f199d4285a7666fc819245fe3e5762046d8df875291283059033287b9e1f9d71345e86a20a2 SHA512 4da2d464da0d7f438e782bbb539c394588c046af0c1415718ffa2e43e6500eaa60aedefe58b814281c41873a4ebae8b01f5299798583e9662a347a95ed5a5e69
 EBUILD llvm-libunwind-16.0.2.ebuild 3045 BLAKE2B e0704cc1c6a743ecd3c073df9456f7a549896a9992083ee650803f199d4285a7666fc819245fe3e5762046d8df875291283059033287b9e1f9d71345e86a20a2 SHA512 4da2d464da0d7f438e782bbb539c394588c046af0c1415718ffa2e43e6500eaa60aedefe58b814281c41873a4ebae8b01f5299798583e9662a347a95ed5a5e69
 EBUILD llvm-libunwind-16.0.3.9999.ebuild 2978 BLAKE2B 9143fac20e5d73511c56e8015c4758075bf62329b64428b9244812f2fe5fa32772c9ad29e3e7beb1aaa2ff3ef70ee69f9673c0becf7df09f4e2fc5d348c03512 SHA512 b790b15702e2ba0367c771d58dfe975f7b97bb6a90acca97d1180b1b3ba44893575bc92ee1cfe037c308b3191f3d1b8309a0a658cd8617b0993bfa8ce4630d97
+EBUILD llvm-libunwind-16.0.3.ebuild 3045 BLAKE2B e0704cc1c6a743ecd3c073df9456f7a549896a9992083ee650803f199d4285a7666fc819245fe3e5762046d8df875291283059033287b9e1f9d71345e86a20a2 SHA512 4da2d464da0d7f438e782bbb539c394588c046af0c1415718ffa2e43e6500eaa60aedefe58b814281c41873a4ebae8b01f5299798583e9662a347a95ed5a5e69
 EBUILD llvm-libunwind-17.0.0.9999.ebuild 2979 BLAKE2B 6c50c9b69b0cc8fa3799e9506b5d45946ea2606dc53d0925976633c2209f6148653e8b12bc31b76f56c4963d64b27971aec00c9e4da89d0489a76d1ba61a9f37 SHA512 e09e4bdbd8af6a470894c5950d81edf7574eba7c56f922c5447777247fa886dde958b8ee13257ca40cd7cee8af9f91fd6b9c11cf42a53b48bee0aacb469270ee
 EBUILD llvm-libunwind-17.0.0_pre20230325.ebuild 2978 BLAKE2B 9143fac20e5d73511c56e8015c4758075bf62329b64428b9244812f2fe5fa32772c9ad29e3e7beb1aaa2ff3ef70ee69f9673c0becf7df09f4e2fc5d348c03512 SHA512 b790b15702e2ba0367c771d58dfe975f7b97bb6a90acca97d1180b1b3ba44893575bc92ee1cfe037c308b3191f3d1b8309a0a658cd8617b0993bfa8ce4630d97
 EBUILD llvm-libunwind-17.0.0_pre20230414.ebuild 2978 BLAKE2B 9143fac20e5d73511c56e8015c4758075bf62329b64428b9244812f2fe5fa32772c9ad29e3e7beb1aaa2ff3ef70ee69f9673c0becf7df09f4e2fc5d348c03512 SHA512 b790b15702e2ba0367c771d58dfe975f7b97bb6a90acca97d1180b1b3ba44893575bc92ee1cfe037c308b3191f3d1b8309a0a658cd8617b0993bfa8ce4630d97
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-16.0.3.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-16.0.3.ebuild
new file mode 100644
index 000000000000..049f6bc1cc17
--- /dev/null
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-16.0.3.ebuild
@@ -0,0 +1,123 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{9..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="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86 ~x64-macos"
+IUSE="+clang debug static-libs test"
+REQUIRED_USE="test? ( clang )"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	!sys-libs/libunwind
+"
+DEPEND="
+	sys-devel/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	clang? (
+		sys-devel/clang:${LLVM_MAJOR}
+	)
+	!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
+	python_has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+pkg_setup() {
+	LLVM_MAX_SLOT=${LLVM_MAJOR} llvm_pkg_setup
+	python-any-r1_pkg_setup
+}
+
+multilib_src_configure() {
+	local libdir=$(get_libdir)
+
+	# https://github.com/llvm/llvm-project/issues/56825
+	# also separately bug #863917
+	filter-lto
+
+	if use clang; then
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	# link to compiler-rt
+	# https://github.com/gentoo/gentoo/pull/21516
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
+
+	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${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
+}