13 files changed, 1021 insertions, 0 deletions
diff --git a/sys-libs/Manifest.gz b/sys-libs/Manifest.gz
index 82dfb427f64d..debca27225a0 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 a30fcb6cabcf..ddfbf5af2899 100644
--- a/sys-libs/compiler-rt-sanitizers/Manifest
+++ b/sys-libs/compiler-rt-sanitizers/Manifest
@@ -6,6 +6,7 @@ DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43
 DIST llvm-project-17.0.6.src.tar.xz 127838860 BLAKE2B d6ede1a9fda8756995c3e0654111941649e15794179641806f18919f1dc68c41ca0cabd5693b5096d05dccc3a391cd20d34af1137bf8af92ed3117a1ce84d1b2 SHA512 6d85bf749e0d77553cc215cbfa61cec4ac4f4f652847f56f946b6a892a99a5ea40b6ab8b39a9708a035001f007986941ccf17e4635260a8b0c1fa59e78d41e30
 DIST llvm-project-17.0.6.src.tar.xz.sig 438 BLAKE2B 186e75b6a0fbfe1e85408589c149e1800fcc47d685b74e4260018e05cd08bc793d1d1197c9c50e177eea941a3d0c65cb0c583ce6dae449099b920adf8a508ef7 SHA512 f78c55053a6450625f3e95f52c305110b4468a9854fec75831b65b8d6ceee3c9206ab9e63c4b5fda8be9bd344f72cfbdaae0520ed240abd505e08ebeaa25d340
 DIST llvm-project-8d817f6479a5df874028a8b40fd30aecd3479005.tar.gz 204890108 BLAKE2B 8c57c556371b37d00cda753a40f1162e678d89fa40e8f2b90a38aab7e17f9debfb2ebad53a3a95aa530a9e3e2b4b735828e404e576c8f2738370ec41c28badce SHA512 a38ce082ca1b999888ee0a633b94a02258579591e6ce73ba4722eafb9f0610f9624887eca43e4a6ae567c07ffc014f4ea4137e905899407951265d7c93785f18
+DIST llvm-project-9eb0f86c279f40a792ec27bf0e9b491b8c90a640.tar.gz 205195168 BLAKE2B c3d051270958216196d6051d41e78168a7027714c5658c7edc70d274ed91f9d4ee16e8d1f92672bf252c65005c636c380766210ac3d80b4ac2f9f6305aefa29b SHA512 ee62acdfa756a2ddeb46fcafa364489885b6ecc50c87f365af42f308ebc87b9674c33c2f5a84c5169d9c9cada08e4fffe35d2eff48f05b70e791e27ac2c8b347
 DIST llvm-project-a085402ef54379758e6c996dbaedfcb92ad222b5.tar.gz 204569231 BLAKE2B 75403225fbe54f0921b279b237a90f1922b16997d1538fa5f225e04451fa2fc4a28e886efb7460ef0c26a3a964f0c57084e331b0736fa223926259c76d873200 SHA512 b8c6b0c7c0a4c369ecfa7ac71cf96549a19853e14bdf061b6b54429ce7ed998b236bb9ed3adbd6bf1c70c7e975508f751ebd0031ac2ff474d32216048a1c5f2d
 EBUILD compiler-rt-sanitizers-15.0.7.ebuild 6556 BLAKE2B e434e692cef521b574c9c566bb19f990910e25de620f284ae84204da588f4ed42996348ab1a9b58b4c4c4ae3f140fd8bcad42431416b15888f12e085cadcdbd6 SHA512 5f6b4ae9010ff21c7eefcb77cae85d73ef5d64cc961b0f6672e5158eb5242f55c6bf2bdadc3f18eb8a18fbdbd94442156539386d229aee3dbe6b953440cb39a6
 EBUILD compiler-rt-sanitizers-16.0.6.ebuild 6523 BLAKE2B 9e81f29f1928262b3ea0fdec218f4430351da68a569bfaeea007a4d4e7552be1aa0232bfe5e74b164103d9908f7ac3fe1dd790ce06bb2e5b2b05a82879b271c4 SHA512 f04019755779116adadc66e6f4485c2b100d737e793d9f8532081688c195a6dd7f0dd8cf9077febf424d52d21982d0a266f3e4c8f453a34b4f16c05437d2cb28
@@ -13,4 +14,5 @@ EBUILD compiler-rt-sanitizers-17.0.6.ebuild 6357 BLAKE2B fc5e42e7b52d57e2ed4e3c8
 EBUILD compiler-rt-sanitizers-18.0.0.9999.ebuild 6270 BLAKE2B fc7f9fac67dbafe30768b6b61b8828dd9323813a102c432e8a211a7e909e9f8dc47421b44427906bbba981d63f0b8fa9262e721de492a47bf5cd0c9a4c40946f SHA512 66b72446f8aaf6b07af34dd5d43d5556183ca18949673ac313a5dda5c74562c02bc6691b0c95a75609173c587bd378968e46f40663c75fab22ec8782a813ac21
 EBUILD compiler-rt-sanitizers-18.0.0_pre20240106.ebuild 6270 BLAKE2B fc7f9fac67dbafe30768b6b61b8828dd9323813a102c432e8a211a7e909e9f8dc47421b44427906bbba981d63f0b8fa9262e721de492a47bf5cd0c9a4c40946f SHA512 66b72446f8aaf6b07af34dd5d43d5556183ca18949673ac313a5dda5c74562c02bc6691b0c95a75609173c587bd378968e46f40663c75fab22ec8782a813ac21
 EBUILD compiler-rt-sanitizers-18.0.0_pre20240113.ebuild 6270 BLAKE2B fc7f9fac67dbafe30768b6b61b8828dd9323813a102c432e8a211a7e909e9f8dc47421b44427906bbba981d63f0b8fa9262e721de492a47bf5cd0c9a4c40946f SHA512 66b72446f8aaf6b07af34dd5d43d5556183ca18949673ac313a5dda5c74562c02bc6691b0c95a75609173c587bd378968e46f40663c75fab22ec8782a813ac21
+EBUILD compiler-rt-sanitizers-18.0.0_pre20240120.ebuild 6270 BLAKE2B fc7f9fac67dbafe30768b6b61b8828dd9323813a102c432e8a211a7e909e9f8dc47421b44427906bbba981d63f0b8fa9262e721de492a47bf5cd0c9a4c40946f SHA512 66b72446f8aaf6b07af34dd5d43d5556183ca18949673ac313a5dda5c74562c02bc6691b0c95a75609173c587bd378968e46f40663c75fab22ec8782a813ac21
 MISC metadata.xml 1412 BLAKE2B 75675507000fa6a6b8182e6b45a08a2716ae7fb9a7e3428dc8420464e4c1d1bdb5bea62cc2f553c579de5a4faa752b35cb3529d980fb07a055ff4ddf6e752707 SHA512 f05ea5168b923db72f4f5b53e9b748ebbcdae9eff09d86323313055933b47fc0089e1b2d73cd997d73dcfb2dca032344955816425fbddc09d27ca751463aadbb
diff --git a/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-18.0.0_pre20240120.ebuild b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-18.0.0_pre20240120.ebuild
new file mode 100644
index 000000000000..2ab1ae07e4c7
--- /dev/null
+++ b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-18.0.0_pre20240120.ebuild
@@ -0,0 +1,216 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+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}"
+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="
+	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_${cmake_flag^^}/s:TRUE:FALSE:" \
+				cmake/config-ix.cmake || die
+		fi
+	done
+
+	# TODO: fix these tests to be skipped upstream
+	if use asan && ! use profile; then
+		rm test/asan/TestCases/asan_and_llvm_coverage_test.cpp || die
+	fi
+	if use ubsan && ! use cfi; then
+		> test/cfi/CMakeLists.txt || die
+	fi
+	# hangs, sigh
+	rm test/tsan/getline_nohang.cpp || die
+
+	llvm.org_src_prepare
+}
+
+src_configure() {
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${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 e8ae29004a07..05980c992734 100644
--- a/sys-libs/compiler-rt/Manifest
+++ b/sys-libs/compiler-rt/Manifest
@@ -8,6 +8,7 @@ DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43
 DIST llvm-project-17.0.6.src.tar.xz 127838860 BLAKE2B d6ede1a9fda8756995c3e0654111941649e15794179641806f18919f1dc68c41ca0cabd5693b5096d05dccc3a391cd20d34af1137bf8af92ed3117a1ce84d1b2 SHA512 6d85bf749e0d77553cc215cbfa61cec4ac4f4f652847f56f946b6a892a99a5ea40b6ab8b39a9708a035001f007986941ccf17e4635260a8b0c1fa59e78d41e30
 DIST llvm-project-17.0.6.src.tar.xz.sig 438 BLAKE2B 186e75b6a0fbfe1e85408589c149e1800fcc47d685b74e4260018e05cd08bc793d1d1197c9c50e177eea941a3d0c65cb0c583ce6dae449099b920adf8a508ef7 SHA512 f78c55053a6450625f3e95f52c305110b4468a9854fec75831b65b8d6ceee3c9206ab9e63c4b5fda8be9bd344f72cfbdaae0520ed240abd505e08ebeaa25d340
 DIST llvm-project-8d817f6479a5df874028a8b40fd30aecd3479005.tar.gz 204890108 BLAKE2B 8c57c556371b37d00cda753a40f1162e678d89fa40e8f2b90a38aab7e17f9debfb2ebad53a3a95aa530a9e3e2b4b735828e404e576c8f2738370ec41c28badce SHA512 a38ce082ca1b999888ee0a633b94a02258579591e6ce73ba4722eafb9f0610f9624887eca43e4a6ae567c07ffc014f4ea4137e905899407951265d7c93785f18
+DIST llvm-project-9eb0f86c279f40a792ec27bf0e9b491b8c90a640.tar.gz 205195168 BLAKE2B c3d051270958216196d6051d41e78168a7027714c5658c7edc70d274ed91f9d4ee16e8d1f92672bf252c65005c636c380766210ac3d80b4ac2f9f6305aefa29b SHA512 ee62acdfa756a2ddeb46fcafa364489885b6ecc50c87f365af42f308ebc87b9674c33c2f5a84c5169d9c9cada08e4fffe35d2eff48f05b70e791e27ac2c8b347
 DIST llvm-project-a085402ef54379758e6c996dbaedfcb92ad222b5.tar.gz 204569231 BLAKE2B 75403225fbe54f0921b279b237a90f1922b16997d1538fa5f225e04451fa2fc4a28e886efb7460ef0c26a3a964f0c57084e331b0736fa223926259c76d873200 SHA512 b8c6b0c7c0a4c369ecfa7ac71cf96549a19853e14bdf061b6b54429ce7ed998b236bb9ed3adbd6bf1c70c7e975508f751ebd0031ac2ff474d32216048a1c5f2d
 EBUILD compiler-rt-15.0.7.ebuild 4238 BLAKE2B 22d56dbe24c92400bf58942390b06af70fddba89d8fecc9b85162dd7a41c6ee592eaaf883f5ad483f65f74fabccc28f94528688410ee36e2d5279efcc6066de0 SHA512 ca49d23def580d4dcfc4058768eeb9deb6e59ea44575da272d1c142fffe0bf4e3d3c7c9fa6182ab348a3aab11879af116a549cb1a3a03b27b4bf4151cf892aaa
 EBUILD compiler-rt-16.0.6-r4.ebuild 5213 BLAKE2B 9cb09df83ee48aa46a369318dfbda36299a57677231ac4d34308e18fd53e1d9c4b371a5cf7ec70c62c644b2c97b783d834f00ed3b9fccedebb001402243918c7 SHA512 a9307f77b527d7b6bfb1b7df3cda40f1d4c4c033e62f9dc8133748ae7f581f8e494e73b8b21f57920f2d9c3c9914eac3a940716430f20768f305a333f6f7ac8f
@@ -16,4 +17,5 @@ EBUILD compiler-rt-17.0.6.ebuild 5207 BLAKE2B 1148f3f652c85272932e323150297c5af1
 EBUILD compiler-rt-18.0.0.9999.ebuild 5100 BLAKE2B abb00661c56b19674be9cc974c0a42efa9e53ae4384b11042981561c276c0fedc981e5458aab9182bec29ae4a6cf33f178a3b3607af0a58f7cd6c68f5e73be36 SHA512 23811d805e6657e11c3914235ebe2a8df2aa0c28b66054125626f7450f02501340d16d6e3096caa0c5968f6e8f36644eae68d45dfb8a1717396f9b54627111b7
 EBUILD compiler-rt-18.0.0_pre20240106.ebuild 5100 BLAKE2B abb00661c56b19674be9cc974c0a42efa9e53ae4384b11042981561c276c0fedc981e5458aab9182bec29ae4a6cf33f178a3b3607af0a58f7cd6c68f5e73be36 SHA512 23811d805e6657e11c3914235ebe2a8df2aa0c28b66054125626f7450f02501340d16d6e3096caa0c5968f6e8f36644eae68d45dfb8a1717396f9b54627111b7
 EBUILD compiler-rt-18.0.0_pre20240113.ebuild 5100 BLAKE2B abb00661c56b19674be9cc974c0a42efa9e53ae4384b11042981561c276c0fedc981e5458aab9182bec29ae4a6cf33f178a3b3607af0a58f7cd6c68f5e73be36 SHA512 23811d805e6657e11c3914235ebe2a8df2aa0c28b66054125626f7450f02501340d16d6e3096caa0c5968f6e8f36644eae68d45dfb8a1717396f9b54627111b7
+EBUILD compiler-rt-18.0.0_pre20240120.ebuild 5100 BLAKE2B abb00661c56b19674be9cc974c0a42efa9e53ae4384b11042981561c276c0fedc981e5458aab9182bec29ae4a6cf33f178a3b3607af0a58f7cd6c68f5e73be36 SHA512 23811d805e6657e11c3914235ebe2a8df2aa0c28b66054125626f7450f02501340d16d6e3096caa0c5968f6e8f36644eae68d45dfb8a1717396f9b54627111b7
 MISC metadata.xml 416 BLAKE2B 79a58249c94b605ba57f346c4e05b43853cf6cfb8bb65a4f4e3c44039cccfdb83dd31bfaaaf398bcbdc393efabdfc7ed186fe775976c46227e74decf2c8f4fb2 SHA512 ce30c79a575e5933effb1fec36f9a4ef02d9f97f312feb39c55a88cbda9a1bae1d7af2ec4ad5f66212cbb2cdbfb26f1a436689f16f410153c9d65eb010264c48
diff --git a/sys-libs/compiler-rt/compiler-rt-18.0.0_pre20240120.ebuild b/sys-libs/compiler-rt/compiler-rt-18.0.0_pre20240120.ebuild
new file mode 100644
index 000000000000..364ccbcca438
--- /dev/null
+++ b/sys-libs/compiler-rt/compiler-rt-18.0.0_pre20240120.ebuild
@@ -0,0 +1,175 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+inherit cmake crossdev 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}"
+IUSE="+abi_x86_32 abi_x86_64 +clang +debug test"
+RESTRICT="!test? ( test ) !clang? ( test )"
+
+DEPEND="
+	sys-devel/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	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
+
+	if target_is_not_host || tc-is-cross-compiler ; then
+		# strips vars like CFLAGS="-march=x86_64-v3" for non-x86 architectures
+		CHOST=${CTARGET} strip-unsupported-flags
+		# overrides host docs otherwise
+		DOCS=()
+	fi
+	python-any-r1_pkg_setup
+}
+
+test_compiler() {
+	target_is_not_host && return
+	$(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}/${P}_build
+
+	if use clang && ! is_crosspkg; then
+		# Only do this conditionally to allow overriding with
+		# e.g. CC=clang-13 in case of breakage
+		if ! tc-is-clang ; then
+			local -x CC=${CHOST}-clang
+			local -x CXX=${CHOST}-clang++
+		fi
+
+		strip-unsupported-flags
+	fi
+
+	if ! is_crosspkg && ! test_compiler ; then
+		local nolib_flags=( -nodefaultlibs -lc )
+
+		if test_compiler "${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="${PYTHON}"
+	)
+
+	if use amd64 && ! target_is_not_host; then
+		mycmakeargs+=(
+			-DCAN_TARGET_i386=$(usex abi_x86_32)
+			-DCAN_TARGET_x86_64=$(usex abi_x86_64)
+		)
+	fi
+
+	if is_crosspkg; then
+		# Needed to target built libc headers
+		export CFLAGS="${CFLAGS} -isystem /usr/${CTARGET}/usr/include"
+		mycmakeargs+=(
+			# Without this, the compiler will compile a test program
+			# and fail due to no builtins.
+			-DCMAKE_C_COMPILER_WORKS=1
+			-DCMAKE_CXX_COMPILER_WORKS=1
+
+			# Without this, compiler-rt install location is not unique
+			# to target triples, only to architecture.
+			# Needed if you want to target multiple libcs for one arch.
+			-DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON
+
+			-DCMAKE_ASM_COMPILER_TARGET="${CTARGET}"
+			-DCMAKE_C_COMPILER_TARGET="${CTARGET}"
+			-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
+		)
+	fi
+
+	if use prefix && [[ "${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 ed47ee982cf5..4cf74eb3b33e 100644
--- a/sys-libs/libcxx/Manifest
+++ b/sys-libs/libcxx/Manifest
@@ -7,6 +7,7 @@ DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43
 DIST llvm-project-17.0.6.src.tar.xz 127838860 BLAKE2B d6ede1a9fda8756995c3e0654111941649e15794179641806f18919f1dc68c41ca0cabd5693b5096d05dccc3a391cd20d34af1137bf8af92ed3117a1ce84d1b2 SHA512 6d85bf749e0d77553cc215cbfa61cec4ac4f4f652847f56f946b6a892a99a5ea40b6ab8b39a9708a035001f007986941ccf17e4635260a8b0c1fa59e78d41e30
 DIST llvm-project-17.0.6.src.tar.xz.sig 438 BLAKE2B 186e75b6a0fbfe1e85408589c149e1800fcc47d685b74e4260018e05cd08bc793d1d1197c9c50e177eea941a3d0c65cb0c583ce6dae449099b920adf8a508ef7 SHA512 f78c55053a6450625f3e95f52c305110b4468a9854fec75831b65b8d6ceee3c9206ab9e63c4b5fda8be9bd344f72cfbdaae0520ed240abd505e08ebeaa25d340
 DIST llvm-project-8d817f6479a5df874028a8b40fd30aecd3479005.tar.gz 204890108 BLAKE2B 8c57c556371b37d00cda753a40f1162e678d89fa40e8f2b90a38aab7e17f9debfb2ebad53a3a95aa530a9e3e2b4b735828e404e576c8f2738370ec41c28badce SHA512 a38ce082ca1b999888ee0a633b94a02258579591e6ce73ba4722eafb9f0610f9624887eca43e4a6ae567c07ffc014f4ea4137e905899407951265d7c93785f18
+DIST llvm-project-9eb0f86c279f40a792ec27bf0e9b491b8c90a640.tar.gz 205195168 BLAKE2B c3d051270958216196d6051d41e78168a7027714c5658c7edc70d274ed91f9d4ee16e8d1f92672bf252c65005c636c380766210ac3d80b4ac2f9f6305aefa29b SHA512 ee62acdfa756a2ddeb46fcafa364489885b6ecc50c87f365af42f308ebc87b9674c33c2f5a84c5169d9c9cada08e4fffe35d2eff48f05b70e791e27ac2c8b347
 DIST llvm-project-a085402ef54379758e6c996dbaedfcb92ad222b5.tar.gz 204569231 BLAKE2B 75403225fbe54f0921b279b237a90f1922b16997d1538fa5f225e04451fa2fc4a28e886efb7460ef0c26a3a964f0c57084e331b0736fa223926259c76d873200 SHA512 b8c6b0c7c0a4c369ecfa7ac71cf96549a19853e14bdf061b6b54429ce7ed998b236bb9ed3adbd6bf1c70c7e975508f751ebd0031ac2ff474d32216048a1c5f2d
 EBUILD libcxx-15.0.7-r1.ebuild 5283 BLAKE2B 4380fc5b851054a5ec226ee4c92a2b79511d73ac9b3f8bccc977211601eca36113fc0ae605854da53898507021f24a8b319197605c556244d84253bede7b84f4 SHA512 0a5859269422e794deb43ed960651a1dea830af28b5e395f32e28de8e67a1f399507340230af1c84248853f554e751709a60a9a78aeb0eb42804cb41907dbfce
 EBUILD libcxx-16.0.6.ebuild 5287 BLAKE2B fc7ce91f80be1d635a4693fe44f9379701dc3d4241b2eaa701338f02ae580a402661ee60f6349119935a8fb1ce1667b83895a9da8f4da897cc12e8d2a6ed7e76 SHA512 69e9c4ed649f70fd5fd7d84049d095b9e65494749181b2a81f05b473b4303ebc3a353187039e1fc1d270fc39342bca2785b2a75a0025232bee57e2a2506c7ef0
@@ -14,4 +15,5 @@ EBUILD libcxx-17.0.6.ebuild 5269 BLAKE2B dbc9cfac07759943f456cf6919b66b74da69e6a
 EBUILD libcxx-18.0.0.9999.ebuild 5601 BLAKE2B c11cf57ef6b6c209473b69b0c95c1a656387d3d32494c2a65537c67127a9d9b15a3153609b64c9046f29f29bdd916b0f482ddfad705612f4cdb78ea8ec68621c SHA512 a611b6bf010e315d5d3dc4454c6baf85e33579258ce990fab523a3daffadc3dac1bd51d035a42ed711dac5c5314ff3615cc67347178ecb84437e787fce29ed7e
 EBUILD libcxx-18.0.0_pre20240106.ebuild 5501 BLAKE2B acd2a9e00abb864ca387c95bb7d2acce2b5b3086eba1a9b5cb4c89ea37774170ba39708c8e258d07e214f6166b6f2c4391c7b55e621326fa410346c5c3a32463 SHA512 8fc3dbe5f1798fd69742802396787fc05aee5bf1f9e41f1369e84b3b564b987f9f3a76b0091ad780a8648e54d14acaf404e8ad89b6bef35c890caad0d9e3d9d2
 EBUILD libcxx-18.0.0_pre20240113.ebuild 5601 BLAKE2B c11cf57ef6b6c209473b69b0c95c1a656387d3d32494c2a65537c67127a9d9b15a3153609b64c9046f29f29bdd916b0f482ddfad705612f4cdb78ea8ec68621c SHA512 a611b6bf010e315d5d3dc4454c6baf85e33579258ce990fab523a3daffadc3dac1bd51d035a42ed711dac5c5314ff3615cc67347178ecb84437e787fce29ed7e
+EBUILD libcxx-18.0.0_pre20240120.ebuild 5601 BLAKE2B c11cf57ef6b6c209473b69b0c95c1a656387d3d32494c2a65537c67127a9d9b15a3153609b64c9046f29f29bdd916b0f482ddfad705612f4cdb78ea8ec68621c SHA512 a611b6bf010e315d5d3dc4454c6baf85e33579258ce990fab523a3daffadc3dac1bd51d035a42ed711dac5c5314ff3615cc67347178ecb84437e787fce29ed7e
 MISC metadata.xml 598 BLAKE2B b7a60449e0d8e4e7605ec203dfaa45b17a265b024e21a3bcfe05a3aeb6c3d19a1d2a218cb1f9ac9ed52296f0d6e723fed251f364341fb70cbd91b747962db580 SHA512 a23f912efff52c4687767023da826ace8c6e5dcd5e69ece86aabbea99da89e48ba81cdc292f03193e2e8a05743e62ebf4d4735d038e0cc4b42714fa277569335
diff --git a/sys-libs/libcxx/libcxx-18.0.0_pre20240120.ebuild b/sys-libs/libcxx/libcxx-18.0.0_pre20240120.ebuild
new file mode 100644
index 000000000000..a24b477a5ab8
--- /dev/null
+++ b/sys-libs/libcxx/libcxx-18.0.0_pre20240120.ebuild
@@ -0,0 +1,213 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+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"
+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-debug/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
+}
+
+src_prepare() {
+	# hanging tests
+	# https://github.com/llvm/llvm-project/issues/73791
+	rm ../libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_* || die
+	rm ../libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.*_equals* || die
+
+	cmake_src_prepare
+}
+
+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=${use_compiler_rt}
+		# this is broken with standalone builds, and also meaningless
+		-DLIBCXXABI_USE_LLVM_UNWINDER=OFF
+	)
+
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+			-DPython3_EXECUTABLE="${PYTHON}"
+		)
+	fi
+	cmake_src_configure
+}
+
+multilib_src_compile() {
+	cmake_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 148bb3edecf6..1deaa0e1053d 100644
--- a/sys-libs/libcxxabi/Manifest
+++ b/sys-libs/libcxxabi/Manifest
@@ -5,6 +5,7 @@ DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43
 DIST llvm-project-17.0.6.src.tar.xz 127838860 BLAKE2B d6ede1a9fda8756995c3e0654111941649e15794179641806f18919f1dc68c41ca0cabd5693b5096d05dccc3a391cd20d34af1137bf8af92ed3117a1ce84d1b2 SHA512 6d85bf749e0d77553cc215cbfa61cec4ac4f4f652847f56f946b6a892a99a5ea40b6ab8b39a9708a035001f007986941ccf17e4635260a8b0c1fa59e78d41e30
 DIST llvm-project-17.0.6.src.tar.xz.sig 438 BLAKE2B 186e75b6a0fbfe1e85408589c149e1800fcc47d685b74e4260018e05cd08bc793d1d1197c9c50e177eea941a3d0c65cb0c583ce6dae449099b920adf8a508ef7 SHA512 f78c55053a6450625f3e95f52c305110b4468a9854fec75831b65b8d6ceee3c9206ab9e63c4b5fda8be9bd344f72cfbdaae0520ed240abd505e08ebeaa25d340
 DIST llvm-project-8d817f6479a5df874028a8b40fd30aecd3479005.tar.gz 204890108 BLAKE2B 8c57c556371b37d00cda753a40f1162e678d89fa40e8f2b90a38aab7e17f9debfb2ebad53a3a95aa530a9e3e2b4b735828e404e576c8f2738370ec41c28badce SHA512 a38ce082ca1b999888ee0a633b94a02258579591e6ce73ba4722eafb9f0610f9624887eca43e4a6ae567c07ffc014f4ea4137e905899407951265d7c93785f18
+DIST llvm-project-9eb0f86c279f40a792ec27bf0e9b491b8c90a640.tar.gz 205195168 BLAKE2B c3d051270958216196d6051d41e78168a7027714c5658c7edc70d274ed91f9d4ee16e8d1f92672bf252c65005c636c380766210ac3d80b4ac2f9f6305aefa29b SHA512 ee62acdfa756a2ddeb46fcafa364489885b6ecc50c87f365af42f308ebc87b9674c33c2f5a84c5169d9c9cada08e4fffe35d2eff48f05b70e791e27ac2c8b347
 DIST llvm-project-a085402ef54379758e6c996dbaedfcb92ad222b5.tar.gz 204569231 BLAKE2B 75403225fbe54f0921b279b237a90f1922b16997d1538fa5f225e04451fa2fc4a28e886efb7460ef0c26a3a964f0c57084e331b0736fa223926259c76d873200 SHA512 b8c6b0c7c0a4c369ecfa7ac71cf96549a19853e14bdf061b6b54429ce7ed998b236bb9ed3adbd6bf1c70c7e975508f751ebd0031ac2ff474d32216048a1c5f2d
 EBUILD libcxxabi-15.0.7.ebuild 2911 BLAKE2B 5f2004d2f68fe4eddb0b22be82d28fcca7954d0e3ad9a5510744adc4d0dfd7a1ab9fd928404adcd3eeecc58703f51117d0a80e5895b53e0ae7b71621ad5a435c SHA512 5b8e2c6abdec785649aa41b7f05ab86ecab30ff0631d6078c9b1052b406c320c5847b8f16ffa6d9e62ba4a6bca5959b18770810924d6e6da264fb08d6ff738d0
 EBUILD libcxxabi-16.0.6.ebuild 2919 BLAKE2B e281e229f747de5d8f976852b5e4f27126d220f65c9f6a380968a5f0f1957405cd36a2f01211af46c3962a09a8258a03e0a06af63733b0f46663048207034f03 SHA512 debe5dd103de3b600fbd8e58e464e4d11e48e762711ae64406c64d05e6258e5c025ff1bac9f3d10f4cef49abd0058e86696a658f8f82f4000ef749108eb760f2
@@ -12,4 +13,5 @@ EBUILD libcxxabi-17.0.6.ebuild 2921 BLAKE2B 6166c3f497ac216dd2a687944527c165c82c
 EBUILD libcxxabi-18.0.0.9999.ebuild 2957 BLAKE2B d4072cab29cc5452165b99dfc51c6b651e385e54e6e070ce8d7360e5418dc00c4f0263965a47220b3289d82f81de012ddf41b5b5c04700900084342d25c40d58 SHA512 c3f7718792b7539926b2754d49092b704f0e3a1ef0455f0d345abca187ede31e105ba2980e0e4d338b5451123aab156c78f43b0ee7834d421172ee3e1002edff
 EBUILD libcxxabi-18.0.0_pre20240106.ebuild 2857 BLAKE2B e0c737c68e94b697e39977e61807b978643626b4a8e86720177cc0ca5e8edfec61d96698fb3acac6f6420bcf8319e26ffade15ee0f35cc8aaa864affd0b2ff42 SHA512 3825c3b0c104950135ee87e6bc34418718cbc6a95ad545e132a264e7f1be6c42f0eaafd9a1773cf0d125cb71bd543324cb37e7ab00780e92f5e55aa24da38631
 EBUILD libcxxabi-18.0.0_pre20240113.ebuild 2957 BLAKE2B d4072cab29cc5452165b99dfc51c6b651e385e54e6e070ce8d7360e5418dc00c4f0263965a47220b3289d82f81de012ddf41b5b5c04700900084342d25c40d58 SHA512 c3f7718792b7539926b2754d49092b704f0e3a1ef0455f0d345abca187ede31e105ba2980e0e4d338b5451123aab156c78f43b0ee7834d421172ee3e1002edff
+EBUILD libcxxabi-18.0.0_pre20240120.ebuild 2957 BLAKE2B d4072cab29cc5452165b99dfc51c6b651e385e54e6e070ce8d7360e5418dc00c4f0263965a47220b3289d82f81de012ddf41b5b5c04700900084342d25c40d58 SHA512 c3f7718792b7539926b2754d49092b704f0e3a1ef0455f0d345abca187ede31e105ba2980e0e4d338b5451123aab156c78f43b0ee7834d421172ee3e1002edff
 MISC metadata.xml 438 BLAKE2B 0a830a06a53a6cdaf138ad7620fe366fae05c1c1451267d6a58caf7da5ce8f5a26d302fab53b9460920074ab5a65991d3bd24fde087809e8dc12188dd94c7676 SHA512 d53e13c497569636fb453a159c5ca5ddfabf8e5debd5f92e5149c52d54c876753842ab73293d6d08e2d9b279363b4f0c743eed3a5027a61246c6b60496be8e87
diff --git a/sys-libs/libcxxabi/libcxxabi-18.0.0_pre20240120.ebuild b/sys-libs/libcxxabi/libcxxabi-18.0.0_pre20240120.ebuild
new file mode 100644
index 000000000000..2c496689828b
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-18.0.0_pre20240120.ebuild
@@ -0,0 +1,117 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+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"
+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="${EPREFIX}"/usr/include
+		# this is broken with standalone builds, and also meaningless
+		-DLIBCXXABI_USE_LLVM_UNWINDER=OFF
+
+		-DLIBCXX_LIBDIR_SUFFIX=
+		-DLIBCXX_ENABLE_SHARED=ON
+		-DLIBCXX_ENABLE_STATIC=OFF
+		-DLIBCXX_CXX_ABI=libcxxabi
+		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
+		-DLIBCXX_HAS_MUSL_LIBC=$(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 ce1025101366..30c3833facb6 100644
--- a/sys-libs/libomp/Manifest
+++ b/sys-libs/libomp/Manifest
@@ -6,6 +6,7 @@ DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43
 DIST llvm-project-17.0.6.src.tar.xz 127838860 BLAKE2B d6ede1a9fda8756995c3e0654111941649e15794179641806f18919f1dc68c41ca0cabd5693b5096d05dccc3a391cd20d34af1137bf8af92ed3117a1ce84d1b2 SHA512 6d85bf749e0d77553cc215cbfa61cec4ac4f4f652847f56f946b6a892a99a5ea40b6ab8b39a9708a035001f007986941ccf17e4635260a8b0c1fa59e78d41e30
 DIST llvm-project-17.0.6.src.tar.xz.sig 438 BLAKE2B 186e75b6a0fbfe1e85408589c149e1800fcc47d685b74e4260018e05cd08bc793d1d1197c9c50e177eea941a3d0c65cb0c583ce6dae449099b920adf8a508ef7 SHA512 f78c55053a6450625f3e95f52c305110b4468a9854fec75831b65b8d6ceee3c9206ab9e63c4b5fda8be9bd344f72cfbdaae0520ed240abd505e08ebeaa25d340
 DIST llvm-project-8d817f6479a5df874028a8b40fd30aecd3479005.tar.gz 204890108 BLAKE2B 8c57c556371b37d00cda753a40f1162e678d89fa40e8f2b90a38aab7e17f9debfb2ebad53a3a95aa530a9e3e2b4b735828e404e576c8f2738370ec41c28badce SHA512 a38ce082ca1b999888ee0a633b94a02258579591e6ce73ba4722eafb9f0610f9624887eca43e4a6ae567c07ffc014f4ea4137e905899407951265d7c93785f18
+DIST llvm-project-9eb0f86c279f40a792ec27bf0e9b491b8c90a640.tar.gz 205195168 BLAKE2B c3d051270958216196d6051d41e78168a7027714c5658c7edc70d274ed91f9d4ee16e8d1f92672bf252c65005c636c380766210ac3d80b4ac2f9f6305aefa29b SHA512 ee62acdfa756a2ddeb46fcafa364489885b6ecc50c87f365af42f308ebc87b9674c33c2f5a84c5169d9c9cada08e4fffe35d2eff48f05b70e791e27ac2c8b347
 DIST llvm-project-a085402ef54379758e6c996dbaedfcb92ad222b5.tar.gz 204569231 BLAKE2B 75403225fbe54f0921b279b237a90f1922b16997d1538fa5f225e04451fa2fc4a28e886efb7460ef0c26a3a964f0c57084e331b0736fa223926259c76d873200 SHA512 b8c6b0c7c0a4c369ecfa7ac71cf96549a19853e14bdf061b6b54429ce7ed998b236bb9ed3adbd6bf1c70c7e975508f751ebd0031ac2ff474d32216048a1c5f2d
 EBUILD libomp-15.0.7-r6.ebuild 3474 BLAKE2B e8ab2666defb3a2d0582f0413ade0efce3d5e5d42ee935dc89915c079dd3d7e2c9dde77edb4e3dadee7b1a60a311615f253feef33f73dee90a0ddc9383bbfaa1 SHA512 e6e672ff57b1419b33b2c0da4e2535005b720e3cd34fa18245fdf319bbe70235bcbaa8baeca36381684041f57032ef4a7f0ece4ad1a84336ebd3087759fe31e9
 EBUILD libomp-16.0.6.ebuild 3988 BLAKE2B 31eee2f5b764917a62cb307fab6dd0744594dc0ebdc04c359a85eb6372421a42431dd9de792671e1f0d326d798df1bbae5949529a22d7f2a99cae02d6734a37b SHA512 4e62220e10ab0aa1b64ae9557055b1ac6ecc145ae81cbe94445a335ad4e0d7e541dd13db4ffcffaaf80a50e2f13136982828d4d0211e5dc925a0b6ef2a2825a7
@@ -13,4 +14,5 @@ EBUILD libomp-17.0.6.ebuild 3991 BLAKE2B 12cfa3e181654b85caee03e7f288631f5cbdb85
 EBUILD libomp-18.0.0.9999.ebuild 4142 BLAKE2B 8fd0abaecb796b94a750c09ea99fcb790095ff72b5b83e53467d04e2e8bbfa18bc4a03ed628f87eb356e7269ddecb21e4cab47bb3a1e6a4a0d0a1bfa06fcabde SHA512 c5208e853dc96ac20320fce2f5a9baf514c96b75492c12ea7fe7c8fa24ebb7939c952c660482e59138e19d2ba23bf2327270cf96678742b6eeb50f5cc61657ee
 EBUILD libomp-18.0.0_pre20240106.ebuild 3910 BLAKE2B 7d42af77f9a57c5d38402eadd153ea32d9349c67428bdbf7941fc5aa093d7f4db37d38f77f0c9f20f45a04c809eac577b650a7608c0752415fc1a3d6edd8bc6d SHA512 fcb0c040fd64054d43e9ef7ffedba057d653978d30019b9fff5e7221abd5fea6205d85115ed320d098d069cc2b7a760486d36239653b60a784097ae95926a865
 EBUILD libomp-18.0.0_pre20240113.ebuild 4142 BLAKE2B 8fd0abaecb796b94a750c09ea99fcb790095ff72b5b83e53467d04e2e8bbfa18bc4a03ed628f87eb356e7269ddecb21e4cab47bb3a1e6a4a0d0a1bfa06fcabde SHA512 c5208e853dc96ac20320fce2f5a9baf514c96b75492c12ea7fe7c8fa24ebb7939c952c660482e59138e19d2ba23bf2327270cf96678742b6eeb50f5cc61657ee
+EBUILD libomp-18.0.0_pre20240120.ebuild 4142 BLAKE2B 8fd0abaecb796b94a750c09ea99fcb790095ff72b5b83e53467d04e2e8bbfa18bc4a03ed628f87eb356e7269ddecb21e4cab47bb3a1e6a4a0d0a1bfa06fcabde SHA512 c5208e853dc96ac20320fce2f5a9baf514c96b75492c12ea7fe7c8fa24ebb7939c952c660482e59138e19d2ba23bf2327270cf96678742b6eeb50f5cc61657ee
 MISC metadata.xml 883 BLAKE2B 127e896b82a49633a6866b33ca776ebe2dd149a5d04da4484a53186f219a85db0ab9d826bc1cc61d4df9fa54c9bcc546be070a0b28985174925fd947aa09cca2 SHA512 dc32cae01401feb93eede6506b3955c766ff19b44976fcc67277559b23ac151993377daeed9ba83b2dd71dbdeea330cd1208dcb0c9c5f56be270883b31f9b15f
diff --git a/sys-libs/libomp/libomp-18.0.0_pre20240120.ebuild b/sys-libs/libomp/libomp-18.0.0_pre20240120.ebuild
new file mode 100644
index 000000000000..1d41ecc498a1
--- /dev/null
+++ b/sys-libs/libomp/libomp-18.0.0_pre20240120.ebuild
@@ -0,0 +1,157 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+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}"
+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 [[ ${build_omptarget} == ON ]]; then
+		local ffi_cflags=$($(tc-getPKG_CONFIG) --cflags-only-I libffi)
+		local ffi_ldflags=$($(tc-getPKG_CONFIG) --libs-only-L libffi)
+		mycmakeargs+=(
+			-DFFI_INCLUDE_DIR="${ffi_cflags#-I}"
+			-DFFI_LIBRARY_DIR="${ffi_ldflags#-L}"
+		)
+
+		if has "${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 336b1625c29f..acb6a14a9656 100644
--- a/sys-libs/llvm-libunwind/Manifest
+++ b/sys-libs/llvm-libunwind/Manifest
@@ -5,6 +5,7 @@ DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43
 DIST llvm-project-17.0.6.src.tar.xz 127838860 BLAKE2B d6ede1a9fda8756995c3e0654111941649e15794179641806f18919f1dc68c41ca0cabd5693b5096d05dccc3a391cd20d34af1137bf8af92ed3117a1ce84d1b2 SHA512 6d85bf749e0d77553cc215cbfa61cec4ac4f4f652847f56f946b6a892a99a5ea40b6ab8b39a9708a035001f007986941ccf17e4635260a8b0c1fa59e78d41e30
 DIST llvm-project-17.0.6.src.tar.xz.sig 438 BLAKE2B 186e75b6a0fbfe1e85408589c149e1800fcc47d685b74e4260018e05cd08bc793d1d1197c9c50e177eea941a3d0c65cb0c583ce6dae449099b920adf8a508ef7 SHA512 f78c55053a6450625f3e95f52c305110b4468a9854fec75831b65b8d6ceee3c9206ab9e63c4b5fda8be9bd344f72cfbdaae0520ed240abd505e08ebeaa25d340
 DIST llvm-project-8d817f6479a5df874028a8b40fd30aecd3479005.tar.gz 204890108 BLAKE2B 8c57c556371b37d00cda753a40f1162e678d89fa40e8f2b90a38aab7e17f9debfb2ebad53a3a95aa530a9e3e2b4b735828e404e576c8f2738370ec41c28badce SHA512 a38ce082ca1b999888ee0a633b94a02258579591e6ce73ba4722eafb9f0610f9624887eca43e4a6ae567c07ffc014f4ea4137e905899407951265d7c93785f18
+DIST llvm-project-9eb0f86c279f40a792ec27bf0e9b491b8c90a640.tar.gz 205195168 BLAKE2B c3d051270958216196d6051d41e78168a7027714c5658c7edc70d274ed91f9d4ee16e8d1f92672bf252c65005c636c380766210ac3d80b4ac2f9f6305aefa29b SHA512 ee62acdfa756a2ddeb46fcafa364489885b6ecc50c87f365af42f308ebc87b9674c33c2f5a84c5169d9c9cada08e4fffe35d2eff48f05b70e791e27ac2c8b347
 DIST llvm-project-a085402ef54379758e6c996dbaedfcb92ad222b5.tar.gz 204569231 BLAKE2B 75403225fbe54f0921b279b237a90f1922b16997d1538fa5f225e04451fa2fc4a28e886efb7460ef0c26a3a964f0c57084e331b0736fa223926259c76d873200 SHA512 b8c6b0c7c0a4c369ecfa7ac71cf96549a19853e14bdf061b6b54429ce7ed998b236bb9ed3adbd6bf1c70c7e975508f751ebd0031ac2ff474d32216048a1c5f2d
 EBUILD llvm-libunwind-15.0.7.ebuild 3032 BLAKE2B 9b47e894db1a764f3eca3135f4caba68261953f4433af017b7bb53181e345ad26c570733f997022c53c9ef49a0a3b823188d92cfcc16a2113825d767b1ffab2a SHA512 0b68480fb2a8e5a351574e81fbcff824cd324754ed40378f06fec12fedbba94a921043d72db6ecc37f8b0680b7f518bbbd8d63f69ce8d84f86ca522653d293fb
 EBUILD llvm-libunwind-16.0.6-r1.ebuild 3427 BLAKE2B 64039b2f0476a6b93aba54cca4ef3ad7310a240a4e8b10c6d625eb40a45b8c60cf37eca4391344872ceeed22db0c33d6af5d60b5c3246ff9d395ccc8def87d53 SHA512 77f71992f3749b4e85f8426e073aae6d829aaa5705a7ff5545063823dc7eb12fb70c5ec1c2b691422bcb3a4396c44ef2ba535ada2cf47e15ae825cc894b3726d
@@ -12,4 +13,5 @@ EBUILD llvm-libunwind-17.0.6.ebuild 3430 BLAKE2B 76ad096d3beb0290ca9555ea6ee84cf
 EBUILD llvm-libunwind-18.0.0.9999.ebuild 3355 BLAKE2B ed26a365a02c8fd7c5432b0386240e447dfb719cbb688d3d88cb47f8054c927aca29004a8719bc279cf7ea6b033d8ccb73ccfe6f4c508486f85c622360a5d247 SHA512 33ae579cfc54e35fdf777b760800f5b048395887973a157ee17ddc37fd60a844f09c5dbc550fca3a90bc887eceb72535fbab9a950cab252fe117b034f9b143a3
 EBUILD llvm-libunwind-18.0.0_pre20240106.ebuild 3355 BLAKE2B 9082db8b72435be9eb39bd2ed250ed6320f657d5ada1f56e3ae39538e54ff53603a33dd99c471d4cee1db52321df2bbf6844d240bab344ffe8e8b2735989f0b7 SHA512 8544a067dbffb9e4d58e16c77072d5eef1170212ff311aa596ab7619023d727907d7060f61e5dea0a890cdc1334b616c89b1ac7b5c254e3a9163273aab487ca2
 EBUILD llvm-libunwind-18.0.0_pre20240113.ebuild 3355 BLAKE2B 9082db8b72435be9eb39bd2ed250ed6320f657d5ada1f56e3ae39538e54ff53603a33dd99c471d4cee1db52321df2bbf6844d240bab344ffe8e8b2735989f0b7 SHA512 8544a067dbffb9e4d58e16c77072d5eef1170212ff311aa596ab7619023d727907d7060f61e5dea0a890cdc1334b616c89b1ac7b5c254e3a9163273aab487ca2
+EBUILD llvm-libunwind-18.0.0_pre20240120.ebuild 3355 BLAKE2B 9082db8b72435be9eb39bd2ed250ed6320f657d5ada1f56e3ae39538e54ff53603a33dd99c471d4cee1db52321df2bbf6844d240bab344ffe8e8b2735989f0b7 SHA512 8544a067dbffb9e4d58e16c77072d5eef1170212ff311aa596ab7619023d727907d7060f61e5dea0a890cdc1334b616c89b1ac7b5c254e3a9163273aab487ca2
 MISC metadata.xml 438 BLAKE2B 2a36fbbc59e137056029c62aef6d167d9c82531c2582d7bad5cb13cc36e5c4c9518ffe8c56d06bbcfd97ad22eda71a8b776f3984195f53d06cf45659b438dc00 SHA512 4f18b054072d00e5440faa31a59f9ef587d035b5f25e30913f0b1449debee967fa794fae2548e87db3fb2177ce853ab075e1f11f3cc763f5d7fdf06147108845
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-18.0.0_pre20240120.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-18.0.0_pre20240120.ebuild
new file mode 100644
index 000000000000..73ad1389deb4
--- /dev/null
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-18.0.0_pre20240120.ebuild
@@ -0,0 +1,131 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+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"
+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
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
+
+	# Respect upstream build type assumptions (bug #910436) where they do:
+	# -DLIBUNWIND_ENABLE_ASSERTIONS=ON =>
+	#       -DCMAKE_BUILD_TYPE=DEBUG  => -UNDEBUG
+	#       -DCMAKE_BUILD_TYPE!=debug => -DNDEBUG
+	# -DLIBUNWIND_ENABLE_ASSERTIONS=OFF =>
+	#       -UNDEBUG
+	# See also https://github.com/llvm/llvm-project/issues/86#issuecomment-1649668826.
+	use debug || append-cppflags -DNDEBUG
+
+	local mycmakeargs=(
+		-DCMAKE_CXX_COMPILER_TARGET="${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
+}