13 files changed, 984 insertions, 0 deletions
diff --git a/sys-libs/Manifest.gz b/sys-libs/Manifest.gz
index c0d814e3161a..6fa7cbc52567 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 2aff4cc0c463..f267cad108f3 100644
--- a/sys-libs/compiler-rt-sanitizers/Manifest
+++ b/sys-libs/compiler-rt-sanitizers/Manifest
@@ -6,11 +6,14 @@ DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78
 DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
 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-16.0.4.src.tar.xz 117996332 BLAKE2B 2ea3ef25290ce6180d271e42fbf5e02da973a21e3929c1ac8d1e3e7b268d39db97611e15654ca7e6527add24542d0eed0ee2b1b9d85dfd0ba661e55356bac5d3 SHA512 860bcb999005f55bed25691304983d7bf707f8e3246000595b412b9e88f4a1614be0adb43bbff9c30f49b969373fa0becab02a56ac37915a5f83c52ca8ea3f95
+DIST llvm-project-16.0.4.src.tar.xz.sig 566 BLAKE2B 43cb2147f12f98f864797158e8efcfed9c6780fae3b5c71c0f1aea19a4131ee91c36bdf5b10e44f478f2370c8d22a9038038ecd607f25a95f2d3e33628eb9ac0 SHA512 c902d1b652e6e144fcf74f550539f56665475b6bdf673ba5bf2f1731c3bb8f5717ed56433d488c54bbf2f429b432da84e0bfb4b5fb5f2b7fa208b4f24f682be7
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-7d436d56b60b36508b94e39d08761f1405a9c770.tar.gz 183363091 BLAKE2B e0d3520814b3455e33107715697f00d653ad46bb8d8200caf42c42743520f389217ea2e57449bbc2e98126b602b2aa344e4125e4b1f92152f7957a11a9b9a150 SHA512 65a8e30702217e5e1309efe3daeda5115eeb2e8d25238db1fa4e8dcfc729d75655a10b3394f2f70b7e7efb8ea33a31b6e2482065cc81805023101da00584a81e
 EBUILD compiler-rt-sanitizers-14.0.6.ebuild 6526 BLAKE2B 371b7d7bfbcacce1c04cf039b15f49bf5c8fb7de0352c4f477b92d1efe0c70442770ec0c6b60572cf5877b5c14492328cf727b2aa5c1dea761eb909aa1e1df6c SHA512 ee1f054abb9954eedd5b098afb1eb741cd2d7b1b329ef66ed3f25f8ed050227a31925852e3d893b0a9913e2ef2ac34efe89c66c19b562c586f7c0352a10a5814
 EBUILD compiler-rt-sanitizers-15.0.7.ebuild 6578 BLAKE2B 79b9477f9f426c7e5ffc07fe9e2abc86ee568d8e081ac5e5e3da3e3e169920fe8c0ce34f9a8ac03a4389f27ecb0b0ff7f5cf91622d614e03300f17ea97d20859 SHA512 9d23f6974edbe69e5d9fa53a3885e8e44741b5e5d90b0e72c6d191b70827d1e590a7c5a3373bc4fb4945a50db0eea5e119baeaeea956c6d92bb087410ce919b0
 EBUILD compiler-rt-sanitizers-16.0.3.ebuild 6550 BLAKE2B a3d856b59f3ad6ce433952a31081576c91576e764119720cf9af44dd54a1813f9f08da03c26cab7a4d00e8b44852197588b14eb52826419b353b44c926cf37bf SHA512 509c25c720fb1f4e3664491f41b23242dd24ba541cc319680cea6e0dc01bebe929af943281fe03473f49fff369b3021cc6abb0d5e6b8b1fd7fabc071961cdaa6
+EBUILD compiler-rt-sanitizers-16.0.4.ebuild 6550 BLAKE2B a3d856b59f3ad6ce433952a31081576c91576e764119720cf9af44dd54a1813f9f08da03c26cab7a4d00e8b44852197588b14eb52826419b353b44c926cf37bf SHA512 509c25c720fb1f4e3664491f41b23242dd24ba541cc319680cea6e0dc01bebe929af943281fe03473f49fff369b3021cc6abb0d5e6b8b1fd7fabc071961cdaa6
 EBUILD compiler-rt-sanitizers-16.0.5.9999.ebuild 6248 BLAKE2B 8548074a3b572bc5b19e9a70ed91225678172cb43b71ad501811d3741367c56f1ffe0e1b528934f620e7d8a30bd1fc463ada54113bea16c322f1d821a8503756 SHA512 8825b15e4965e58365a96517831120e1d5c02130f83cc1150b7a107142782cee74830d3dc0234453291d0f487789cd005303d47269381ad45356e4fd779decf5
 EBUILD compiler-rt-sanitizers-17.0.0.9999.ebuild 6249 BLAKE2B 036338e02f018bd9cb01036851fcee5af58f012e15c4fcb55a207e519d2b553e83f2871869681055a9c672b091126e95d52a1c50a605a94e27b866b22dd64732 SHA512 94a1deb4cbba26d0e1aa02333c2d3375349b059e1fe75f26368ab54d13b276c27ea377f4cce9b1cdf0a508add5ddae4886a59bbb24cd8bec61a7e5d03660746c
 EBUILD compiler-rt-sanitizers-17.0.0_pre20230502.ebuild 6249 BLAKE2B 036338e02f018bd9cb01036851fcee5af58f012e15c4fcb55a207e519d2b553e83f2871869681055a9c672b091126e95d52a1c50a605a94e27b866b22dd64732 SHA512 94a1deb4cbba26d0e1aa02333c2d3375349b059e1fe75f26368ab54d13b276c27ea377f4cce9b1cdf0a508add5ddae4886a59bbb24cd8bec61a7e5d03660746c
diff --git a/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-16.0.4.ebuild b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-16.0.4.ebuild
new file mode 100644
index 000000000000..d7d5778a3c8c
--- /dev/null
+++ b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-16.0.4.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 8b56d8b0177e..eb6cba3c8831 100644
--- a/sys-libs/compiler-rt/Manifest
+++ b/sys-libs/compiler-rt/Manifest
@@ -6,11 +6,14 @@ DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78
 DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
 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-16.0.4.src.tar.xz 117996332 BLAKE2B 2ea3ef25290ce6180d271e42fbf5e02da973a21e3929c1ac8d1e3e7b268d39db97611e15654ca7e6527add24542d0eed0ee2b1b9d85dfd0ba661e55356bac5d3 SHA512 860bcb999005f55bed25691304983d7bf707f8e3246000595b412b9e88f4a1614be0adb43bbff9c30f49b969373fa0becab02a56ac37915a5f83c52ca8ea3f95
+DIST llvm-project-16.0.4.src.tar.xz.sig 566 BLAKE2B 43cb2147f12f98f864797158e8efcfed9c6780fae3b5c71c0f1aea19a4131ee91c36bdf5b10e44f478f2370c8d22a9038038ecd607f25a95f2d3e33628eb9ac0 SHA512 c902d1b652e6e144fcf74f550539f56665475b6bdf673ba5bf2f1731c3bb8f5717ed56433d488c54bbf2f429b432da84e0bfb4b5fb5f2b7fa208b4f24f682be7
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-7d436d56b60b36508b94e39d08761f1405a9c770.tar.gz 183363091 BLAKE2B e0d3520814b3455e33107715697f00d653ad46bb8d8200caf42c42743520f389217ea2e57449bbc2e98126b602b2aa344e4125e4b1f92152f7957a11a9b9a150 SHA512 65a8e30702217e5e1309efe3daeda5115eeb2e8d25238db1fa4e8dcfc729d75655a10b3394f2f70b7e7efb8ea33a31b6e2482065cc81805023101da00584a81e
 EBUILD compiler-rt-14.0.6-r1.ebuild 4248 BLAKE2B 56b00f1c57cdaf1cd6dd7f15e13c714461001c0c2fb25e565c1677745e3fe6e61714e2f037814fef3eb32ef6866d517c391cb5f63c852ed132d74b1b5b7ef393 SHA512 31cd40fe6c58a6a653d36e99586230c7686ccb2bcdfa1c8ead4331dec2fd8dc53afc2a1e9bdf165dc5b4f7580c8cd25bc7a68acfa9c881fd775187bd82e28f11
 EBUILD compiler-rt-15.0.7.ebuild 4260 BLAKE2B ae8a86217b480bab08dc99d4c5a648bf99a0ef91fb41233956b4a5d1b10d5ed6b3c14d9c02c43e2c0b11dd19f4773ca995c113e48b14475b95b7ee7b821a72d1 SHA512 79da724a1d2483af0dbcc792d008fe994c4fe075db31c7dfcc64192005427137f0157e81345a4027e5a8ba9104f662bc51bf492bca96e1b46c35a44a1849ab84
 EBUILD compiler-rt-16.0.3.ebuild 4244 BLAKE2B b4fa336d5147d1f452cfe2d423d86a7d3c61747c537c7ad6d3925c0f8cb375e63a7ca3a233504f246bba3e8571552ee575852ef9d14c4f7386078d89bbda0f90 SHA512 f41f64f6bce1331285993ce6542fca86ae5e8fbe6bf2ebbd7b5393fef8916125efb571d4272d64f25667592f04783992b43feb241d64d3186ceab38a686eb75d
+EBUILD compiler-rt-16.0.4.ebuild 4244 BLAKE2B b4fa336d5147d1f452cfe2d423d86a7d3c61747c537c7ad6d3925c0f8cb375e63a7ca3a233504f246bba3e8571552ee575852ef9d14c4f7386078d89bbda0f90 SHA512 f41f64f6bce1331285993ce6542fca86ae5e8fbe6bf2ebbd7b5393fef8916125efb571d4272d64f25667592f04783992b43feb241d64d3186ceab38a686eb75d
 EBUILD compiler-rt-16.0.5.9999.ebuild 4165 BLAKE2B 5c1747ed91de0ac5c023f933703fabc2e226f025f8794e09db976b941241c068bb0b241bf9ef6514f01ac2a5642556be7635ddc640710c106c1be10ad3d6241d SHA512 8b293590412b9781aac94517a9e3843d3d08eb20e125fbed48cd28b64acb1cf41087084f652c0e01921ee90509ee2fc3f9ff1a7c6cf6958e82859005559e2573
 EBUILD compiler-rt-17.0.0.9999.ebuild 4166 BLAKE2B cd26aafb9d796d914dd260347378d57ae3e94594a9f204a866bdd3ad261794c0b04e7caff1d0182fb9f4e462dbbc15132106c0118dfdec9b61adce7732da40d7 SHA512 68218eef7361276b938f7b3d5e44483337bdcd988c7dc8abccfa8b56501b6e8cfb6395b6054bbc69972cc3d5b238627ade3715bf9d9853f43b0e1152d6fee41a
 EBUILD compiler-rt-17.0.0_pre20230502.ebuild 4166 BLAKE2B cd26aafb9d796d914dd260347378d57ae3e94594a9f204a866bdd3ad261794c0b04e7caff1d0182fb9f4e462dbbc15132106c0118dfdec9b61adce7732da40d7 SHA512 68218eef7361276b938f7b3d5e44483337bdcd988c7dc8abccfa8b56501b6e8cfb6395b6054bbc69972cc3d5b238627ade3715bf9d9853f43b0e1152d6fee41a
diff --git a/sys-libs/compiler-rt/compiler-rt-16.0.4.ebuild b/sys-libs/compiler-rt/compiler-rt-16.0.4.ebuild
new file mode 100644
index 000000000000..49b92c7f0e51
--- /dev/null
+++ b/sys-libs/compiler-rt/compiler-rt-16.0.4.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 6f48d8b54bc4..2de15d2c9a70 100644
--- a/sys-libs/libcxx/Manifest
+++ b/sys-libs/libcxx/Manifest
@@ -6,12 +6,15 @@ DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78
 DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
 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-16.0.4.src.tar.xz 117996332 BLAKE2B 2ea3ef25290ce6180d271e42fbf5e02da973a21e3929c1ac8d1e3e7b268d39db97611e15654ca7e6527add24542d0eed0ee2b1b9d85dfd0ba661e55356bac5d3 SHA512 860bcb999005f55bed25691304983d7bf707f8e3246000595b412b9e88f4a1614be0adb43bbff9c30f49b969373fa0becab02a56ac37915a5f83c52ca8ea3f95
+DIST llvm-project-16.0.4.src.tar.xz.sig 566 BLAKE2B 43cb2147f12f98f864797158e8efcfed9c6780fae3b5c71c0f1aea19a4131ee91c36bdf5b10e44f478f2370c8d22a9038038ecd607f25a95f2d3e33628eb9ac0 SHA512 c902d1b652e6e144fcf74f550539f56665475b6bdf673ba5bf2f1731c3bb8f5717ed56433d488c54bbf2f429b432da84e0bfb4b5fb5f2b7fa208b4f24f682be7
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-7d436d56b60b36508b94e39d08761f1405a9c770.tar.gz 183363091 BLAKE2B e0d3520814b3455e33107715697f00d653ad46bb8d8200caf42c42743520f389217ea2e57449bbc2e98126b602b2aa344e4125e4b1f92152f7957a11a9b9a150 SHA512 65a8e30702217e5e1309efe3daeda5115eeb2e8d25238db1fa4e8dcfc729d75655a10b3394f2f70b7e7efb8ea33a31b6e2482065cc81805023101da00584a81e
 EBUILD libcxx-14.0.6.ebuild 6949 BLAKE2B 963ece6dbc81f876b8894dd2be0ab4fd5e555dcd09feaf014e30411150f43c9f401910741ded4ecaa05d35f0a2bcf3eb7ce519d4019f464075c31db0c9b6523c SHA512 4c73189a6b719bb10527000b30b83c8811aa462d51bc51bd5b2ff703184e01d8805f0b998479116a39e878ef7486c14e2bfef62bd62b1a20718906eb778a0228
 EBUILD libcxx-15.0.7-r1.ebuild 5307 BLAKE2B 43ff3b320e3050127edf77b51afdb77f25c1dc8826c6b29e8a72f809479df78c661aa2882e6fa9459dd360b379d2a6bbd31d910942d40e49199feafa807a6f4a SHA512 be7372fa0a81a45a55e5896ca507e6a4c29e14f4f152154f43529fcb12c8a96ca0c620b432c1481e8c41bb588d4d3f3c479fb9c7ba2483e53881ffcd9ca7004e
 EBUILD libcxx-15.0.7.ebuild 5282 BLAKE2B 9c1dc8c9ac37ecad2c31231d04068fc60d29df72a393e507e46f12dc093ef11f475ca3df2806551450ea37372dd6739b58b68e7b65290e4ffc18b6fb6085f319 SHA512 f068764ad081f16471f1c3f126095bb5fc61f6151327e50fb6724c93ab33906c72f763b848cb6b0a25b532344a3b6d2b100ed070a6c8bcb7d2e9a4d43e128957
 EBUILD libcxx-16.0.3.ebuild 5294 BLAKE2B 83f9a04af5773a5dcf9f0ba430684e2527695b9b41b8f704a779abb2a9e74060c8450e888f0ccc89bd5befdb32a93706ad2cb82ba309792a1f79297d8a9315d9 SHA512 deed56905f464c6b0baca63585753dbf8975fd2db72493ff8adda9a4ed8cdcb4ca3ef7fcdea6227d6680dca949963f438aaa36947e9045e98a582813eec4defc
+EBUILD libcxx-16.0.4.ebuild 5294 BLAKE2B 83f9a04af5773a5dcf9f0ba430684e2527695b9b41b8f704a779abb2a9e74060c8450e888f0ccc89bd5befdb32a93706ad2cb82ba309792a1f79297d8a9315d9 SHA512 deed56905f464c6b0baca63585753dbf8975fd2db72493ff8adda9a4ed8cdcb4ca3ef7fcdea6227d6680dca949963f438aaa36947e9045e98a582813eec4defc
 EBUILD libcxx-16.0.5.9999.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
 EBUILD libcxx-17.0.0.9999.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
 EBUILD libcxx-17.0.0_pre20230502.ebuild 5239 BLAKE2B 397730a8caf3ca40b19225c6742bc885608d0ed93b04857992564c5040d2bc2196718b0372b497289616d1b334fca9b5e48b1a87604618a4435570df67bf2db0 SHA512 0f6d63282362faf2e845d65ec7f027d38d4d7fc84bfcb4302951cfe279504742f28404da2286f9c5a7439f56a07c20912bfad9d43a42b5a17e9a8b141b06805b
diff --git a/sys-libs/libcxx/libcxx-16.0.4.ebuild b/sys-libs/libcxx/libcxx-16.0.4.ebuild
new file mode 100644
index 000000000000..cdbee6be92d6
--- /dev/null
+++ b/sys-libs/libcxx/libcxx-16.0.4.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 785427000a07..05664db89f43 100644
--- a/sys-libs/libcxxabi/Manifest
+++ b/sys-libs/libcxxabi/Manifest
@@ -4,11 +4,14 @@ DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78
 DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
 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-16.0.4.src.tar.xz 117996332 BLAKE2B 2ea3ef25290ce6180d271e42fbf5e02da973a21e3929c1ac8d1e3e7b268d39db97611e15654ca7e6527add24542d0eed0ee2b1b9d85dfd0ba661e55356bac5d3 SHA512 860bcb999005f55bed25691304983d7bf707f8e3246000595b412b9e88f4a1614be0adb43bbff9c30f49b969373fa0becab02a56ac37915a5f83c52ca8ea3f95
+DIST llvm-project-16.0.4.src.tar.xz.sig 566 BLAKE2B 43cb2147f12f98f864797158e8efcfed9c6780fae3b5c71c0f1aea19a4131ee91c36bdf5b10e44f478f2370c8d22a9038038ecd607f25a95f2d3e33628eb9ac0 SHA512 c902d1b652e6e144fcf74f550539f56665475b6bdf673ba5bf2f1731c3bb8f5717ed56433d488c54bbf2f429b432da84e0bfb4b5fb5f2b7fa208b4f24f682be7
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-7d436d56b60b36508b94e39d08761f1405a9c770.tar.gz 183363091 BLAKE2B e0d3520814b3455e33107715697f00d653ad46bb8d8200caf42c42743520f389217ea2e57449bbc2e98126b602b2aa344e4125e4b1f92152f7957a11a9b9a150 SHA512 65a8e30702217e5e1309efe3daeda5115eeb2e8d25238db1fa4e8dcfc729d75655a10b3394f2f70b7e7efb8ea33a31b6e2482065cc81805023101da00584a81e
 EBUILD libcxxabi-14.0.6.ebuild 3385 BLAKE2B 4de1316298a9ca1fab72d50484e01346b51a9d14eade701ebcb65100984a63b5bbf3cbea8640dc30e665539cf4af4edd5e1cf4efe7761c6e7cd050ba3d82c3ec SHA512 e23fbcd217ab40c2250bb4ab1fbd7845f9619d0333d2177b20051f9fded815c6b49f806201bf8a023db71287ec73c7ba6b4fa85a1256bef8c7861a2a4f480c31
 EBUILD libcxxabi-15.0.7.ebuild 2910 BLAKE2B 0384b9de395b7725422b07d31439af21c120173a2fa24393bf81e6c150b28977368234aa9f602bafcd46126e9f325cf9314b1f8ed26f1baedcfcda8102240cf7 SHA512 1e0114e9236fb02037229aaf03f736efc0bf8362c1aaa8353b527693b1759ca228cbaf783ada136129b221b464bf341fb54be825f9f5d405212554022de524c1
 EBUILD libcxxabi-16.0.3.ebuild 2922 BLAKE2B deb13575bf9827c2e53b9e9d6179c4cb1db4f6e2a2ab63455a6170883f10c2a2acffd82089e4465f3b07794d16bd81f58edc675a9b5a14a0d3423cc1854b4c57 SHA512 46352684087b70b767fa241510318432491f9aad1f9ea83059093f2ed7af8d61e24884a4958f7008f27ef6735de109084b3b28c8f83db31b6f0cd2830f9480e6
+EBUILD libcxxabi-16.0.4.ebuild 2922 BLAKE2B deb13575bf9827c2e53b9e9d6179c4cb1db4f6e2a2ab63455a6170883f10c2a2acffd82089e4465f3b07794d16bd81f58edc675a9b5a14a0d3423cc1854b4c57 SHA512 46352684087b70b767fa241510318432491f9aad1f9ea83059093f2ed7af8d61e24884a4958f7008f27ef6735de109084b3b28c8f83db31b6f0cd2830f9480e6
 EBUILD libcxxabi-16.0.5.9999.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
 EBUILD libcxxabi-17.0.0.9999.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
 EBUILD libcxxabi-17.0.0_pre20230502.ebuild 2867 BLAKE2B 1565024272821f5db0817703d3c344ef2286c0f8cfd09756a9b9ee75482cb89b618b302162bb1cd6b9a4fab3d5e716853fef94015d254a44bd282c50b2b945cc SHA512 b7d17ef8afb5d4415377a9f2b4c9e6a0defec0262c5c8d730036a1c25e8eb2c8fa79c3d67adef58f33b905d43b80d61934dccf1121b7d0669d6e14905655f421
diff --git a/sys-libs/libcxxabi/libcxxabi-16.0.4.ebuild b/sys-libs/libcxxabi/libcxxabi-16.0.4.ebuild
new file mode 100644
index 000000000000..e5d488bf1341
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-16.0.4.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 fc98fc83987e..d0e3f79e3886 100644
--- a/sys-libs/libomp/Manifest
+++ b/sys-libs/libomp/Manifest
@@ -6,11 +6,14 @@ DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78
 DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
 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-16.0.4.src.tar.xz 117996332 BLAKE2B 2ea3ef25290ce6180d271e42fbf5e02da973a21e3929c1ac8d1e3e7b268d39db97611e15654ca7e6527add24542d0eed0ee2b1b9d85dfd0ba661e55356bac5d3 SHA512 860bcb999005f55bed25691304983d7bf707f8e3246000595b412b9e88f4a1614be0adb43bbff9c30f49b969373fa0becab02a56ac37915a5f83c52ca8ea3f95
+DIST llvm-project-16.0.4.src.tar.xz.sig 566 BLAKE2B 43cb2147f12f98f864797158e8efcfed9c6780fae3b5c71c0f1aea19a4131ee91c36bdf5b10e44f478f2370c8d22a9038038ecd607f25a95f2d3e33628eb9ac0 SHA512 c902d1b652e6e144fcf74f550539f56665475b6bdf673ba5bf2f1731c3bb8f5717ed56433d488c54bbf2f429b432da84e0bfb4b5fb5f2b7fa208b4f24f682be7
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-7d436d56b60b36508b94e39d08761f1405a9c770.tar.gz 183363091 BLAKE2B e0d3520814b3455e33107715697f00d653ad46bb8d8200caf42c42743520f389217ea2e57449bbc2e98126b602b2aa344e4125e4b1f92152f7957a11a9b9a150 SHA512 65a8e30702217e5e1309efe3daeda5115eeb2e8d25238db1fa4e8dcfc729d75655a10b3394f2f70b7e7efb8ea33a31b6e2482065cc81805023101da00584a81e
 EBUILD libomp-14.0.6-r1.ebuild 3917 BLAKE2B d92540af690dd622122ad1a4ed2548afa141f1254fbe9a9b3d34286b36f0fa70ccaf915f218c1bea8c68377ea20724db9443d365e2e5f290707f444d3ff47ca5 SHA512 433ae63716103af5aa493c7dbae43f10003cac95abaae579dcb61cba6390da4b9b3fc921e410ba899719bd170fa153a7b3d66c8776c37fd074066173c1fea160
 EBUILD libomp-15.0.7-r2.ebuild 3474 BLAKE2B c75fddce61b7e8fe837b4c5bc1b7dacfbe4bc1572537dd7c44c23f894d05b104e8946d896b3b19d78de32a87d866d5911a0f3a8f81796469bba2753d051b2105 SHA512 7dc7c5fd7cd370acadfdf6e15ed09cde0798312ed3c72e770596aecb5817a4ec1477cc1092e3c159d1988bba4200808259705206f80d8fd0019fe07c34f4455d
 EBUILD libomp-16.0.3.ebuild 3993 BLAKE2B 12ea9bf058a78f1a4439ee65528a592b0fed0a1234e3c318a748f9bf8e520763c7ffda28719f00abbb01fb1a77798f1094ed48fc344d1ea12999a0bbe60a8675 SHA512 b517da1c7c983f21969377852743b5015f6ea86ec078f330d100c8a5bc39de6ee0aa488a15f1702ea765a958ec9ea8903226d81a3ba154273cfa8a5e615cb3b5
+EBUILD libomp-16.0.4.ebuild 3993 BLAKE2B 12ea9bf058a78f1a4439ee65528a592b0fed0a1234e3c318a748f9bf8e520763c7ffda28719f00abbb01fb1a77798f1094ed48fc344d1ea12999a0bbe60a8675 SHA512 b517da1c7c983f21969377852743b5015f6ea86ec078f330d100c8a5bc39de6ee0aa488a15f1702ea765a958ec9ea8903226d81a3ba154273cfa8a5e615cb3b5
 EBUILD libomp-16.0.5.9999.ebuild 3920 BLAKE2B f128f041db9ab95beed986fad4fce1d70d30688dff973aa15a1ffb268f248ade667da316effe8de491d836bebc289a30a691910d1159c7a2563cbaad42f1bfbc SHA512 56a8a37f77c4690041fa9d274b3b52a5cc41588e02961b157f078adafe882bf66957d4d729037baf25f1257a0cb2af5f83e432c2d214234cf6942bf31eb7bd9d
 EBUILD libomp-17.0.0.9999.ebuild 3921 BLAKE2B 2aa5aa2719a4f9a7f244cd92fb819d0fafc81d7f806d1b295c583159e0884c14c04bf1188d8c9e315c4cd2e1d3940311cd4e80f03e501958cd3b38e1c0567ab9 SHA512 c6f7bbf7296b24154a170c47044851c7331564af58cdca813ac13903535e49438c9165c8c811e72ad18e0a2db4e890f9dce163f6f07b0b1d60a473e455402b00
 EBUILD libomp-17.0.0_pre20230502.ebuild 3921 BLAKE2B 2aa5aa2719a4f9a7f244cd92fb819d0fafc81d7f806d1b295c583159e0884c14c04bf1188d8c9e315c4cd2e1d3940311cd4e80f03e501958cd3b38e1c0567ab9 SHA512 c6f7bbf7296b24154a170c47044851c7331564af58cdca813ac13903535e49438c9165c8c811e72ad18e0a2db4e890f9dce163f6f07b0b1d60a473e455402b00
diff --git a/sys-libs/libomp/libomp-16.0.4.ebuild b/sys-libs/libomp/libomp-16.0.4.ebuild
new file mode 100644
index 000000000000..72038b861daa
--- /dev/null
+++ b/sys-libs/libomp/libomp-16.0.4.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 aaf73be5b81b..d04347d97c79 100644
--- a/sys-libs/llvm-libunwind/Manifest
+++ b/sys-libs/llvm-libunwind/Manifest
@@ -4,11 +4,14 @@ DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78
 DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
 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-16.0.4.src.tar.xz 117996332 BLAKE2B 2ea3ef25290ce6180d271e42fbf5e02da973a21e3929c1ac8d1e3e7b268d39db97611e15654ca7e6527add24542d0eed0ee2b1b9d85dfd0ba661e55356bac5d3 SHA512 860bcb999005f55bed25691304983d7bf707f8e3246000595b412b9e88f4a1614be0adb43bbff9c30f49b969373fa0becab02a56ac37915a5f83c52ca8ea3f95
+DIST llvm-project-16.0.4.src.tar.xz.sig 566 BLAKE2B 43cb2147f12f98f864797158e8efcfed9c6780fae3b5c71c0f1aea19a4131ee91c36bdf5b10e44f478f2370c8d22a9038038ecd607f25a95f2d3e33628eb9ac0 SHA512 c902d1b652e6e144fcf74f550539f56665475b6bdf673ba5bf2f1731c3bb8f5717ed56433d488c54bbf2f429b432da84e0bfb4b5fb5f2b7fa208b4f24f682be7
 DIST llvm-project-52882de0e641487329c9e093a90ea3dad01842c8.tar.gz 182953335 BLAKE2B 98682729992d73202e35b540d5d0d87e2acf44e4ab6896a0b6f9ac4a7423f55ad370ae1d7e919a6c86dc7f138a66890ac89b852b03305612d248ab567833f8be SHA512 3685aff0f648e9b477e1e01edebe4799498c21587e2ed5577e2fdef98bb21ea215e206606a11692fbb93a0989fd59fd324faff2c4d97b7afca0851b53f123f05
 DIST llvm-project-7d436d56b60b36508b94e39d08761f1405a9c770.tar.gz 183363091 BLAKE2B e0d3520814b3455e33107715697f00d653ad46bb8d8200caf42c42743520f389217ea2e57449bbc2e98126b602b2aa344e4125e4b1f92152f7957a11a9b9a150 SHA512 65a8e30702217e5e1309efe3daeda5115eeb2e8d25238db1fa4e8dcfc729d75655a10b3394f2f70b7e7efb8ea33a31b6e2482065cc81805023101da00584a81e
 EBUILD llvm-libunwind-14.0.6-r1.ebuild 3161 BLAKE2B ba7b19ed2bc77b52eee0b04d938541d2eb4053b65a641e55e54ebac85adcd432fa60b2b484003890bc96be83d61410bb58c2f3a86f12a7c574044a8e10427db9 SHA512 11854f9ef2a552a96e51c618958e553d4cd4affc78312845a223d0fe6d2ff62e8f8b2b3c29ad4a093b08a6df63b230f21b9ef6b63440058322f6a00f160df3e4
 EBUILD llvm-libunwind-15.0.7.ebuild 3032 BLAKE2B 9b47e894db1a764f3eca3135f4caba68261953f4433af017b7bb53181e345ad26c570733f997022c53c9ef49a0a3b823188d92cfcc16a2113825d767b1ffab2a SHA512 0b68480fb2a8e5a351574e81fbcff824cd324754ed40378f06fec12fedbba94a921043d72db6ecc37f8b0680b7f518bbbd8d63f69ce8d84f86ca522653d293fb
 EBUILD llvm-libunwind-16.0.3.ebuild 3045 BLAKE2B e0704cc1c6a743ecd3c073df9456f7a549896a9992083ee650803f199d4285a7666fc819245fe3e5762046d8df875291283059033287b9e1f9d71345e86a20a2 SHA512 4da2d464da0d7f438e782bbb539c394588c046af0c1415718ffa2e43e6500eaa60aedefe58b814281c41873a4ebae8b01f5299798583e9662a347a95ed5a5e69
+EBUILD llvm-libunwind-16.0.4.ebuild 3045 BLAKE2B e0704cc1c6a743ecd3c073df9456f7a549896a9992083ee650803f199d4285a7666fc819245fe3e5762046d8df875291283059033287b9e1f9d71345e86a20a2 SHA512 4da2d464da0d7f438e782bbb539c394588c046af0c1415718ffa2e43e6500eaa60aedefe58b814281c41873a4ebae8b01f5299798583e9662a347a95ed5a5e69
 EBUILD llvm-libunwind-16.0.5.9999.ebuild 2978 BLAKE2B 9143fac20e5d73511c56e8015c4758075bf62329b64428b9244812f2fe5fa32772c9ad29e3e7beb1aaa2ff3ef70ee69f9673c0becf7df09f4e2fc5d348c03512 SHA512 b790b15702e2ba0367c771d58dfe975f7b97bb6a90acca97d1180b1b3ba44893575bc92ee1cfe037c308b3191f3d1b8309a0a658cd8617b0993bfa8ce4630d97
 EBUILD llvm-libunwind-17.0.0.9999.ebuild 2979 BLAKE2B 6c50c9b69b0cc8fa3799e9506b5d45946ea2606dc53d0925976633c2209f6148653e8b12bc31b76f56c4963d64b27971aec00c9e4da89d0489a76d1ba61a9f37 SHA512 e09e4bdbd8af6a470894c5950d81edf7574eba7c56f922c5447777247fa886dde958b8ee13257ca40cd7cee8af9f91fd6b9c11cf42a53b48bee0aacb469270ee
 EBUILD llvm-libunwind-17.0.0_pre20230502.ebuild 2979 BLAKE2B 6c50c9b69b0cc8fa3799e9506b5d45946ea2606dc53d0925976633c2209f6148653e8b12bc31b76f56c4963d64b27971aec00c9e4da89d0489a76d1ba61a9f37 SHA512 e09e4bdbd8af6a470894c5950d81edf7574eba7c56f922c5447777247fa886dde958b8ee13257ca40cd7cee8af9f91fd6b9c11cf42a53b48bee0aacb469270ee
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-16.0.4.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-16.0.4.ebuild
new file mode 100644
index 000000000000..049f6bc1cc17
--- /dev/null
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-16.0.4.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
+}