16 files changed, 1029 insertions, 610 deletions
diff --git a/sys-libs/libcxxabi/Manifest b/sys-libs/libcxxabi/Manifest
index 104b03477e7a..208843d5bdb6 100644
--- a/sys-libs/libcxxabi/Manifest
+++ b/sys-libs/libcxxabi/Manifest
@@ -1,4 +1,13 @@
-DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3c8a6ff1a1f152f94bfe362c07884339fe571ff7fe903ed3b3deb150b2fa868c387887a0dea2930dc08b81db71a5b1 SHA512 48078fff9293a87f1a973f3348f79506f04c3da774295f5eb67d74dd2d1aa94f0973f8ced3f4ab9e8339902071f82c603b43d5608ad7227046c4da769c5d2151
-DIST llvmorg-11.1.0.tar.gz 122776532 BLAKE2B ca842ff4afff8f44c82b5e7383962a9c45ca1c93b64fa4c6ebcd70a1d3849dbad2b8e4e24fba02d144c6266d7fab3607ebc6999b28c229cb35256cf40f26a985 SHA512 9a8ce022a935eed42fa71a224f2a207122aadcbef58ee855fdb4825f879e7d028e4dcff22c19b9d336db1c8bf63fb84372d44981acf84615f757e54306c92b81
-DIST llvmorg-12.0.0.tar.gz 134226215 BLAKE2B f9c3ba8c58571855caa4f206fd285c9b5be66672fb0814cb8bc0964a051f57f5d35013aa1e27cbda502652b37df1ec23474129109e76a42066847860db441dbe SHA512 0cff02155c5ac0d6db2b72d60d9819d5b5dd859663b45f721b1c7540239c2fceb1f57d9173f6870c49de851c242ed8e85c5c6d6577a1f8092a7c5dcd12513b26
-DIST llvmorg-12.0.1.tar.gz 134259748 BLAKE2B f41de787bc73ff2edfda1b22cc8602be6f65f37dd9e4c8888533cfa8c3ccdcf4f108aaab9de23ab0ab987966eb160f2a553a0bdff99461e71ddd5bfcd086090d SHA512 6eb0dc18e2c25935fabfdfc48b0114be0939158dfdef7b85b395fe2e71042672446af0e68750aae003c9847d10d1f63316fe95d3df738d18f249174292b1b9e1
+DIST llvm-project-15.0.7.src.tar.xz 110936452 BLAKE2B f3d277e2029157329e5be78b78af36b0826a1dfd9a337992499bf701e33149665bfc47d5e14978e38f342559629a559f8b2ce328705ba34fdf6830f5ae9721a5 SHA512 4836d3603f32e8e54434cbfa8ef33d9d473ac5dc20ebf9c67132653c73f4524931abd1084655eaee5f20bcfcb91bcc4bbc5c4a0b603ad0c9029c556e14dc4c52
+DIST llvm-project-15.0.7.src.tar.xz.sig 566 BLAKE2B 47dc8c82d86237b80c6d85f83a6c9a6e9e174cf8e7f367b071e0cd9481d7cd408e991337c5624e07f3f370f26387c814f212808575ed1c1b58404d3e3836b7df SHA512 fc6891b440dd1175eb8df3790590af8d36bc92301660f84744ae15123475aeb900a151e6a8e7998ded27ec4d86871903ad0b89cd61164943054c2e3bc8d8beb2
+DIST llvm-project-16.0.6.src.tar.xz 118013488 BLAKE2B 95192d39cbd2914e5609db365965f1c00bfea6c2d653b3996bd2acef8a2b37e37f6fc8a9d2b65711ad72657e0ef52c42f733053cf65051e7822f27396c30406d SHA512 89a67ebfbbc764cc456e8825ecfa90707741f8835b1b2adffae0b227ab1fe5ca9cce75b0efaffc9ca8431cae528dc54fd838867a56a2b645344d9e82d19ab1b7
+DIST llvm-project-16.0.6.src.tar.xz.sig 566 BLAKE2B 2060cebd5ed57cb8a86a44238c43dfd4b921649298b10c3d19da308374c1e49869174294e29943c2af459fe06428264e26881d6c1288ebbc48686cc2cf467c7a SHA512 ca249262c7102e0889ec1bdc6f71a3a6f0e7e5d5fbab8abcd6fccd2871e7955eff7af5b055a76006097baf0dfaf2f5069eff3035b3107fc552abdb2481b21447
+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-18.1.6.src.tar.xz 132064976 BLAKE2B d38d8026068de371dc4bc288c68c8e441a126cf8e89e55a965f3b9e3a629a37d5743fd7859a60bedaddf27ff2da1e0f08c81806871ef542cb7c3f40b23b22cf5 SHA512 89ec276aa41bb2d76cfc3a72d8e728a9ce9176e02c085338b704790524fe329904cf311381805814faa8a6c79637620c01627bf122a51f89e0f3adb47e5df34c
+DIST llvm-project-18.1.6.src.tar.xz.sig 566 BLAKE2B 4b4a1ec2f084b0728134b9c04775db5938e571f1d7c7aa45b985bed490dcfd2cceab2069a43d4ce7766faec703310a376b83565af317e5f60bf10bc06a732395 SHA512 fbae037d39f4f1c13babafd42dee719f3d79f0e2142cc319f59fb319361a1db8ce65fa736a0e2a5e702ac49e3b8323374be6cfa1003f96b0887fa1894e2b6dee
+DIST llvm-project-18.1.7.src.tar.xz 132063384 BLAKE2B b8c37bd131fb5f3131bfab4fbad7aa811079ca10723faa14779253bc62b1ee08d4e04650e1da883297ed88a62d518b868a1f13cf57d03233254fd01209da5c02 SHA512 0f67818267803aca9d2bc9eb89335ee6dc56269e8066a0f8a48c4a959e8805dbf6bc839b9f96a92f86ee50d72e7cc326ffe18febb5eb06751ab54a217c0221c8
+DIST llvm-project-18.1.7.src.tar.xz.sig 566 BLAKE2B 9ae6d80eba5309ce3d5cba580df57c28dbcf429266b2ced622465e34ab2a7ae0f100d1e89c73a44abccd95a3367979344450fd53fb6a2baa029b929d3f13eee3 SHA512 7e5601e35f4fcaa4ed042638ae5a4fb90714c9dce58aa3f98e965568660b88294185621a4eb5547de262dca8a96f620db3f94932bb1776661e345dbe1266315c
+DIST llvm-project-5aabbf0602c48b67bb89fd37f95bf97c95ded488.tar.gz 212582616 BLAKE2B 78522148bb4993bd26b16f1e3f44c2baf617705667c7fb104edc844c4330017166c783adae2f0215ca7463c05d1eef30fdf02b13241a9497aaede36bb8580a26 SHA512 104e0b5b4f34102f2da03cd54fe9bf5f7fb6efb3a9745d8ec85caa5f92189fde4a5c02c327243d87ff5c7d24b3790fcabdf0ef7144e79e15765785ca72dd3841
+DIST llvm-project-702198fc9ac5dba392f9d9ba7c56467996343c0a.tar.gz 211764675 BLAKE2B b28203faf5c4e51236da3e3abac969cffe6f93ce6757a81b5a577187ec236fc0b124fe6a370d1f4e803deab781606a7caf0b411780cc84ee08a8de942c4fc479 SHA512 b4217403abf4166eb8eccfd304bcaa2e15d5b67c4f996d51e0745d197e4b9eda1dd5a5b1d7c384effc25f53bb1229edda9618e172abe3be1a94a9569f7c5b0b7
+DIST llvm-project-7dc2f6602212bf0a0433c157b70e4fc0d70bb730.tar.gz 211903416 BLAKE2B 4a2f12e0aa234d507d2fc2136a1d98a7624147ce6e401831743e640abcaceb5152c80ba2dc312f9256e4a04be2ad065d1a57dbe5dc24f2d3edc9d65888986710 SHA512 c9eb99f666fc15b29f01a1b2a4b3c6edd3a726033533111e60763c6313a4af8c9dba3396856d6650ac5e666d00941efcc944fac85a4483748bbbea9475e6daf8
diff --git a/sys-libs/libcxxabi/libcxxabi-10.0.1.ebuild b/sys-libs/libcxxabi/libcxxabi-10.0.1.ebuild
deleted file mode 100644
index 7aa13e0d8e6e..000000000000
--- a/sys-libs/libcxxabi/libcxxabi-10.0.1.ebuild
+++ /dev/null
@@ -1,115 +0,0 @@
-# Copyright 1999-2021 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-CMAKE_ECLASS=cmake
-PYTHON_COMPAT=( python3_{7..9} )
-inherit cmake-multilib llvm llvm.org python-any-r1 toolchain-funcs
-
-DESCRIPTION="Low level support for a standard C++ library"
-HOMEPAGE="https://libcxxabi.llvm.org/"
-# libcxx is needed uncondtionally for the headers
-LLVM_COMPONENTS=( libcxx{abi,} )
-llvm.org_set_globals
-
-LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
-SLOT="0"
-KEYWORDS="amd64 arm arm64 x86"
-IUSE="+libunwind static-libs test elibc_musl"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	libunwind? (
-		|| (
-			>=sys-libs/libunwind-1.0.1-r1[static-libs?,${MULTILIB_USEDEP}]
-			>=sys-libs/llvm-libunwind-3.9.0-r1[static-libs?,${MULTILIB_USEDEP}]
-		)
-	)"
-# llvm-6 for new lit options
-DEPEND="${RDEPEND}
-	>=sys-devel/llvm-6"
-BDEPEND="
-	test? ( >=sys-devel/clang-3.9.0
-		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]') )"
-
-python_check_deps() {
-	has_version "dev-python/lit[${PYTHON_USEDEP}]"
-}
-
-pkg_setup() {
-	llvm_pkg_setup
-	use test && python-any-r1_pkg_setup
-}
-
-multilib_src_configure() {
-	# link against compiler-rt instead of libgcc if we are using clang with libunwind
-	local want_compiler_rt=OFF
-	if use libunwind && tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
-
-	local libdir=$(get_libdir)
-	local mycmakeargs=(
-		-DLIBCXXABI_LIBDIR_SUFFIX=${libdir#lib}
-		-DLIBCXXABI_ENABLE_SHARED=ON
-		-DLIBCXXABI_ENABLE_STATIC=$(usex static-libs)
-		-DLIBCXXABI_USE_LLVM_UNWINDER=$(usex libunwind)
-		-DLIBCXXABI_INCLUDE_TESTS=$(usex test)
-		-DLIBCXXABI_USE_COMPILER_RT=${want_compiler_rt}
-
-		-DLIBCXXABI_LIBCXX_INCLUDES="${WORKDIR}"/libcxx/include
-		# upstream is omitting standard search path for this
-		# probably because gcc & clang are bundling their own unwind.h
-		-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
-	)
-	if use test; then
-		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
-		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
-
-		mycmakeargs+=(
-			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-			-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
-		)
-	fi
-	cmake_src_configure
-}
-
-build_libcxx() {
-	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/$(get_libdir)"
-	local CMAKE_USE_DIR=${WORKDIR}/libcxx
-	local BUILD_DIR=${BUILD_DIR}/libcxx
-	local mycmakeargs=(
-		-DLIBCXX_LIBDIR_SUFFIX=
-		-DLIBCXX_ENABLE_SHARED=OFF
-		-DLIBCXX_ENABLE_STATIC=ON
-		-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
-		-DLIBCXX_CXX_ABI=libcxxabi
-		-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${S}"/include
-		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
-		-DLIBCXX_HAS_GCC_S_LIB=OFF
-		-DLIBCXX_INCLUDE_TESTS=OFF
-	)
-
-	cmake_src_configure
-	cmake_src_compile
-}
-
-multilib_src_test() {
-	# build a local copy of libc++ for testing to avoid circular dep
-	build_libcxx
-	mv "${BUILD_DIR}"/libcxx/lib/libc++* "${BUILD_DIR}/$(get_libdir)/" || die
-
-	local -x LIT_PRESERVES_TMP=1
-	cmake_build check-libcxxabi
-}
-
-multilib_src_install_all() {
-	insinto /usr/include/libcxxabi
-	doins -r include/.
-}
diff --git a/sys-libs/libcxxabi/libcxxabi-11.1.0.ebuild b/sys-libs/libcxxabi/libcxxabi-11.1.0.ebuild
deleted file mode 100644
index fa0f31dbb563..000000000000
--- a/sys-libs/libcxxabi/libcxxabi-11.1.0.ebuild
+++ /dev/null
@@ -1,123 +0,0 @@
-# Copyright 1999-2021 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-CMAKE_ECLASS=cmake
-PYTHON_COMPAT=( python3_{7..9} )
-inherit cmake-multilib 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 ~riscv x86 ~x64-macos"
-IUSE="+libunwind static-libs test elibc_musl"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	libunwind? (
-		|| (
-			>=sys-libs/libunwind-1.0.1-r1[static-libs?,${MULTILIB_USEDEP}]
-			>=sys-libs/llvm-libunwind-3.9.0-r1[static-libs?,${MULTILIB_USEDEP}]
-		)
-	)"
-# llvm-6 for new lit options
-DEPEND="${RDEPEND}
-	>=sys-devel/llvm-6"
-BDEPEND="
-	test? ( >=sys-devel/clang-3.9.0
-		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
-	)"
-
-# libcxx is needed uncondtionally for the headers
-LLVM_COMPONENTS=( libcxx{abi,} )
-LLVM_TEST_COMPONENTS=( llvm/cmake )
-llvm.org_set_globals
-
-python_check_deps() {
-	has_version "dev-python/lit[${PYTHON_USEDEP}]"
-}
-
-pkg_setup() {
-	# darwin prefix builds do not have llvm installed yet, so rely on bootstrap-prefix
-	# to set the appropriate path vars to LLVM instead of using llvm_pkg_setup.
-	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
-		llvm_pkg_setup
-	fi
-	use test && python-any-r1_pkg_setup
-}
-
-multilib_src_configure() {
-	# link against compiler-rt instead of libgcc if we are using clang with libunwind
-	local want_compiler_rt=OFF
-	if use libunwind && tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
-
-	local libdir=$(get_libdir)
-	local mycmakeargs=(
-		-DLIBCXXABI_LIBDIR_SUFFIX=${libdir#lib}
-		-DLIBCXXABI_ENABLE_SHARED=ON
-		-DLIBCXXABI_ENABLE_STATIC=$(usex static-libs)
-		-DLIBCXXABI_USE_LLVM_UNWINDER=$(usex libunwind)
-		-DLIBCXXABI_INCLUDE_TESTS=$(usex test)
-		-DLIBCXXABI_USE_COMPILER_RT=${want_compiler_rt}
-
-		-DLIBCXXABI_LIBCXX_INCLUDES="${WORKDIR}"/libcxx/include
-		# upstream is omitting standard search path for this
-		# probably because gcc & clang are bundling their own unwind.h
-		-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
-	)
-	if use test; then
-		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
-		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
-
-		mycmakeargs+=(
-			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-			-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
-			-DPython3_EXECUTABLE="${PYTHON}"
-		)
-	fi
-	cmake_src_configure
-}
-
-build_libcxx() {
-	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/$(get_libdir)"
-	local CMAKE_USE_DIR=${WORKDIR}/libcxx
-	local BUILD_DIR=${BUILD_DIR}/libcxx
-	local mycmakeargs=(
-		-DLIBCXX_LIBDIR_SUFFIX=
-		-DLIBCXX_ENABLE_SHARED=OFF
-		-DLIBCXX_ENABLE_STATIC=ON
-		-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
-		-DLIBCXX_CXX_ABI=libcxxabi
-		-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${S}"/include
-		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
-		-DLIBCXX_HAS_GCC_S_LIB=OFF
-		-DLIBCXX_INCLUDE_TESTS=OFF
-	)
-
-	cmake_src_configure
-	cmake_src_compile
-}
-
-multilib_src_test() {
-	# build a local copy of libc++ for testing to avoid circular dep
-	build_libcxx
-	mv "${BUILD_DIR}"/libcxx/lib/libc++* "${BUILD_DIR}/$(get_libdir)/" || die
-
-	local -x LIT_PRESERVES_TMP=1
-	cmake_build check-cxxabi
-}
-
-multilib_src_install_all() {
-	insinto /usr/include/libcxxabi
-	doins -r include/.
-}
diff --git a/sys-libs/libcxxabi/libcxxabi-12.0.0.ebuild b/sys-libs/libcxxabi/libcxxabi-12.0.0.ebuild
deleted file mode 100644
index 26a66ae37f45..000000000000
--- a/sys-libs/libcxxabi/libcxxabi-12.0.0.ebuild
+++ /dev/null
@@ -1,122 +0,0 @@
-# Copyright 1999-2021 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-CMAKE_ECLASS=cmake
-PYTHON_COMPAT=( python3_{7..9} )
-inherit cmake-multilib llvm llvm.org python-any-r1 toolchain-funcs
-
-DESCRIPTION="Low level support for a standard C++ library"
-HOMEPAGE="https://libcxxabi.llvm.org/"
-
-LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
-SLOT="0"
-KEYWORDS="amd64 arm arm64 ~riscv x86 ~x64-macos"
-IUSE="+libunwind static-libs test elibc_musl"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	libunwind? (
-		|| (
-			>=sys-libs/libunwind-1.0.1-r1[static-libs?,${MULTILIB_USEDEP}]
-			>=sys-libs/llvm-libunwind-3.9.0-r1[static-libs?,${MULTILIB_USEDEP}]
-		)
-	)"
-# llvm-6 for new lit options
-DEPEND="${RDEPEND}
-	>=sys-devel/llvm-6"
-BDEPEND="
-	test? ( >=sys-devel/clang-3.9.0
-		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
-	)"
-
-# libcxx is needed uncondtionally for the headers
-LLVM_COMPONENTS=( libcxx{abi,} llvm/cmake/modules )
-llvm.org_set_globals
-
-python_check_deps() {
-	has_version "dev-python/lit[${PYTHON_USEDEP}]"
-}
-
-pkg_setup() {
-	# darwin prefix builds do not have llvm installed yet, so rely on bootstrap-prefix
-	# to set the appropriate path vars to LLVM instead of using llvm_pkg_setup.
-	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
-		llvm_pkg_setup
-	fi
-	use test && python-any-r1_pkg_setup
-}
-
-multilib_src_configure() {
-	# link against compiler-rt instead of libgcc if we are using clang with libunwind
-	local want_compiler_rt=OFF
-	if use libunwind && tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
-
-	local libdir=$(get_libdir)
-	local mycmakeargs=(
-		-DLIBCXXABI_LIBDIR_SUFFIX=${libdir#lib}
-		-DLIBCXXABI_ENABLE_SHARED=ON
-		-DLIBCXXABI_ENABLE_STATIC=$(usex static-libs)
-		-DLIBCXXABI_USE_LLVM_UNWINDER=$(usex libunwind)
-		-DLIBCXXABI_INCLUDE_TESTS=$(usex test)
-		-DLIBCXXABI_USE_COMPILER_RT=${want_compiler_rt}
-
-		-DLIBCXXABI_LIBCXX_INCLUDES="${WORKDIR}"/libcxx/include
-		# upstream is omitting standard search path for this
-		# probably because gcc & clang are bundling their own unwind.h
-		-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
-	)
-	if use test; then
-		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
-		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
-
-		mycmakeargs+=(
-			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-			-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
-			-DPython3_EXECUTABLE="${PYTHON}"
-		)
-	fi
-	cmake_src_configure
-}
-
-build_libcxx() {
-	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/$(get_libdir)"
-	local CMAKE_USE_DIR=${WORKDIR}/libcxx
-	local BUILD_DIR=${BUILD_DIR}/libcxx
-	local mycmakeargs=(
-		-DLIBCXX_LIBDIR_SUFFIX=
-		-DLIBCXX_ENABLE_SHARED=OFF
-		-DLIBCXX_ENABLE_STATIC=ON
-		-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
-		-DLIBCXX_CXX_ABI=libcxxabi
-		-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${S}"/include
-		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
-		-DLIBCXX_HAS_GCC_S_LIB=OFF
-		-DLIBCXX_INCLUDE_TESTS=OFF
-	)
-
-	cmake_src_configure
-	cmake_src_compile
-}
-
-multilib_src_test() {
-	# build a local copy of libc++ for testing to avoid circular dep
-	build_libcxx
-	mv "${BUILD_DIR}"/libcxx/lib/libc++* "${BUILD_DIR}/$(get_libdir)/" || die
-
-	local -x LIT_PRESERVES_TMP=1
-	cmake_build check-cxxabi
-}
-
-multilib_src_install_all() {
-	insinto /usr/include/libcxxabi
-	doins -r include/.
-}
diff --git a/sys-libs/libcxxabi/libcxxabi-12.0.1.ebuild b/sys-libs/libcxxabi/libcxxabi-12.0.1.ebuild
deleted file mode 100644
index 392b9a3630f5..000000000000
--- a/sys-libs/libcxxabi/libcxxabi-12.0.1.ebuild
+++ /dev/null
@@ -1,122 +0,0 @@
-# Copyright 1999-2021 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-CMAKE_ECLASS=cmake
-PYTHON_COMPAT=( python3_{8..10} )
-inherit cmake-multilib llvm llvm.org python-any-r1 toolchain-funcs
-
-DESCRIPTION="Low level support for a standard C++ library"
-HOMEPAGE="https://libcxxabi.llvm.org/"
-
-LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
-SLOT="0"
-KEYWORDS="~amd64 ~arm ~arm64 ~riscv ~x86 ~x64-macos"
-IUSE="+libunwind static-libs test elibc_musl"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	libunwind? (
-		|| (
-			>=sys-libs/libunwind-1.0.1-r1[static-libs?,${MULTILIB_USEDEP}]
-			>=sys-libs/llvm-libunwind-3.9.0-r1[static-libs?,${MULTILIB_USEDEP}]
-		)
-	)"
-# llvm-6 for new lit options
-DEPEND="${RDEPEND}
-	>=sys-devel/llvm-6"
-BDEPEND="
-	test? ( >=sys-devel/clang-3.9.0
-		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
-	)"
-
-# libcxx is needed uncondtionally for the headers
-LLVM_COMPONENTS=( libcxx{abi,} llvm/cmake/modules )
-llvm.org_set_globals
-
-python_check_deps() {
-	has_version "dev-python/lit[${PYTHON_USEDEP}]"
-}
-
-pkg_setup() {
-	# darwin prefix builds do not have llvm installed yet, so rely on bootstrap-prefix
-	# to set the appropriate path vars to LLVM instead of using llvm_pkg_setup.
-	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
-		llvm_pkg_setup
-	fi
-	use test && python-any-r1_pkg_setup
-}
-
-multilib_src_configure() {
-	# link against compiler-rt instead of libgcc if we are using clang with libunwind
-	local want_compiler_rt=OFF
-	if use libunwind && tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
-
-	local libdir=$(get_libdir)
-	local mycmakeargs=(
-		-DLIBCXXABI_LIBDIR_SUFFIX=${libdir#lib}
-		-DLIBCXXABI_ENABLE_SHARED=ON
-		-DLIBCXXABI_ENABLE_STATIC=$(usex static-libs)
-		-DLIBCXXABI_USE_LLVM_UNWINDER=$(usex libunwind)
-		-DLIBCXXABI_INCLUDE_TESTS=$(usex test)
-		-DLIBCXXABI_USE_COMPILER_RT=${want_compiler_rt}
-
-		-DLIBCXXABI_LIBCXX_INCLUDES="${WORKDIR}"/libcxx/include
-		# upstream is omitting standard search path for this
-		# probably because gcc & clang are bundling their own unwind.h
-		-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
-	)
-	if use test; then
-		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
-		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
-
-		mycmakeargs+=(
-			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-			-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
-			-DPython3_EXECUTABLE="${PYTHON}"
-		)
-	fi
-	cmake_src_configure
-}
-
-build_libcxx() {
-	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/$(get_libdir)"
-	local CMAKE_USE_DIR=${WORKDIR}/libcxx
-	local BUILD_DIR=${BUILD_DIR}/libcxx
-	local mycmakeargs=(
-		-DLIBCXX_LIBDIR_SUFFIX=
-		-DLIBCXX_ENABLE_SHARED=OFF
-		-DLIBCXX_ENABLE_STATIC=ON
-		-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
-		-DLIBCXX_CXX_ABI=libcxxabi
-		-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${S}"/include
-		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
-		-DLIBCXX_HAS_GCC_S_LIB=OFF
-		-DLIBCXX_INCLUDE_TESTS=OFF
-	)
-
-	cmake_src_configure
-	cmake_src_compile
-}
-
-multilib_src_test() {
-	# build a local copy of libc++ for testing to avoid circular dep
-	build_libcxx
-	mv "${BUILD_DIR}"/libcxx/lib/libc++* "${BUILD_DIR}/$(get_libdir)/" || die
-
-	local -x LIT_PRESERVES_TMP=1
-	cmake_build check-cxxabi
-}
-
-multilib_src_install_all() {
-	insinto /usr/include/libcxxabi
-	doins -r include/.
-}
diff --git a/sys-libs/libcxxabi/libcxxabi-13.0.0.9999.ebuild b/sys-libs/libcxxabi/libcxxabi-13.0.0.9999.ebuild
deleted file mode 100644
index 5df21898489a..000000000000
--- a/sys-libs/libcxxabi/libcxxabi-13.0.0.9999.ebuild
+++ /dev/null
@@ -1,122 +0,0 @@
-# Copyright 1999-2021 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-CMAKE_ECLASS=cmake
-PYTHON_COMPAT=( python3_{8..10} )
-inherit cmake-multilib llvm llvm.org python-any-r1 toolchain-funcs
-
-DESCRIPTION="Low level support for a standard C++ library"
-HOMEPAGE="https://libcxxabi.llvm.org/"
-
-LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
-SLOT="0"
-KEYWORDS=""
-IUSE="+libunwind static-libs test elibc_musl"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	libunwind? (
-		|| (
-			>=sys-libs/libunwind-1.0.1-r1[static-libs?,${MULTILIB_USEDEP}]
-			>=sys-libs/llvm-libunwind-3.9.0-r1[static-libs?,${MULTILIB_USEDEP}]
-		)
-	)"
-# llvm-6 for new lit options
-DEPEND="${RDEPEND}
-	>=sys-devel/llvm-6"
-BDEPEND="
-	test? ( >=sys-devel/clang-3.9.0
-		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
-	)"
-
-# libcxx is needed uncondtionally for the headers
-LLVM_COMPONENTS=( libcxx{abi,} llvm/cmake/modules )
-llvm.org_set_globals
-
-python_check_deps() {
-	has_version "dev-python/lit[${PYTHON_USEDEP}]"
-}
-
-pkg_setup() {
-	# darwin prefix builds do not have llvm installed yet, so rely on bootstrap-prefix
-	# to set the appropriate path vars to LLVM instead of using llvm_pkg_setup.
-	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
-		llvm_pkg_setup
-	fi
-	use test && python-any-r1_pkg_setup
-}
-
-multilib_src_configure() {
-	# link against compiler-rt instead of libgcc if we are using clang with libunwind
-	local want_compiler_rt=OFF
-	if use libunwind && tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
-
-	local libdir=$(get_libdir)
-	local mycmakeargs=(
-		-DLIBCXXABI_LIBDIR_SUFFIX=${libdir#lib}
-		-DLIBCXXABI_ENABLE_SHARED=ON
-		-DLIBCXXABI_ENABLE_STATIC=$(usex static-libs)
-		-DLIBCXXABI_USE_LLVM_UNWINDER=$(usex libunwind)
-		-DLIBCXXABI_INCLUDE_TESTS=$(usex test)
-		-DLIBCXXABI_USE_COMPILER_RT=${want_compiler_rt}
-
-		-DLIBCXXABI_LIBCXX_INCLUDES="${WORKDIR}"/libcxx/include
-		# upstream is omitting standard search path for this
-		# probably because gcc & clang are bundling their own unwind.h
-		-DLIBCXXABI_LIBUNWIND_INCLUDES="${EPREFIX}"/usr/include
-	)
-	if use test; then
-		local clang_path=$(type -P "${CHOST:+${CHOST}-}clang" 2>/dev/null)
-		[[ -n ${clang_path} ]] || die "Unable to find ${CHOST}-clang for tests"
-
-		mycmakeargs+=(
-			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-			-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
-			-DPython3_EXECUTABLE="${PYTHON}"
-		)
-	fi
-	cmake_src_configure
-}
-
-build_libcxx() {
-	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/$(get_libdir)"
-	local CMAKE_USE_DIR=${WORKDIR}/libcxx
-	local BUILD_DIR=${BUILD_DIR}/libcxx
-	local mycmakeargs=(
-		-DLIBCXX_LIBDIR_SUFFIX=
-		-DLIBCXX_ENABLE_SHARED=OFF
-		-DLIBCXX_ENABLE_STATIC=ON
-		-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF
-		-DLIBCXX_CXX_ABI=libcxxabi
-		-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${S}"/include
-		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
-		-DLIBCXX_HAS_GCC_S_LIB=OFF
-		-DLIBCXX_INCLUDE_TESTS=OFF
-	)
-
-	cmake_src_configure
-	cmake_src_compile
-}
-
-multilib_src_test() {
-	# build a local copy of libc++ for testing to avoid circular dep
-	build_libcxx
-	mv "${BUILD_DIR}"/libcxx/lib/libc++* "${BUILD_DIR}/$(get_libdir)/" || die
-
-	local -x LIT_PRESERVES_TMP=1
-	cmake_build check-cxxabi
-}
-
-multilib_src_install_all() {
-	insinto /usr/include/libcxxabi
-	doins -r include/.
-}
diff --git a/sys-libs/libcxxabi/libcxxabi-15.0.7.ebuild b/sys-libs/libcxxabi/libcxxabi-15.0.7.ebuild
new file mode 100644
index 000000000000..047a5a0e8d28
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-15.0.7.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 ~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/libcxxabi/libcxxabi-16.0.6.ebuild b/sys-libs/libcxxabi/libcxxabi-16.0.6.ebuild
new file mode 100644
index 000000000000..b9dcfb43e585
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-16.0.6.ebuild
@@ -0,0 +1,116 @@
+# 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"
+KEYWORDS="amd64 arm arm64 ~loong ~riscv sparc x86 ~arm64-macos ~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/libcxxabi/libcxxabi-17.0.6.ebuild b/sys-libs/libcxxabi/libcxxabi-17.0.6.ebuild
new file mode 100644
index 000000000000..b9dcfb43e585
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-17.0.6.ebuild
@@ -0,0 +1,116 @@
+# 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"
+KEYWORDS="amd64 arm arm64 ~loong ~riscv sparc x86 ~arm64-macos ~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/libcxxabi/libcxxabi-18.1.6.ebuild b/sys-libs/libcxxabi/libcxxabi-18.1.6.ebuild
new file mode 100644
index 000000000000..8865a2ce4c2c
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-18.1.6.ebuild
@@ -0,0 +1,111 @@
+# 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.org llvm-utils python-any-r1
+inherit 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 ~arm64-macos ~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[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	llvm_prepend_path "${LLVM_MAJOR}"
+
+	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/libcxxabi/libcxxabi-18.1.7.ebuild b/sys-libs/libcxxabi/libcxxabi-18.1.7.ebuild
new file mode 100644
index 000000000000..8865a2ce4c2c
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-18.1.7.ebuild
@@ -0,0 +1,111 @@
+# 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.org llvm-utils python-any-r1
+inherit 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 ~arm64-macos ~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[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	llvm_prepend_path "${LLVM_MAJOR}"
+
+	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/libcxxabi/libcxxabi-19.0.0.9999.ebuild b/sys-libs/libcxxabi/libcxxabi-19.0.0.9999.ebuild
new file mode 100644
index 000000000000..903f8e866cb6
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-19.0.0.9999.ebuild
@@ -0,0 +1,110 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..13} )
+inherit cmake-multilib flag-o-matic llvm.org llvm-utils python-any-r1
+inherit 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[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	llvm_prepend_path "${LLVM_MAJOR}"
+
+	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/libcxxabi/libcxxabi-19.0.0_pre20240518.ebuild b/sys-libs/libcxxabi/libcxxabi-19.0.0_pre20240518.ebuild
new file mode 100644
index 000000000000..d45de5993114
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-19.0.0_pre20240518.ebuild
@@ -0,0 +1,110 @@
+# 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.org llvm-utils python-any-r1
+inherit 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[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	llvm_prepend_path "${LLVM_MAJOR}"
+
+	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/libcxxabi/libcxxabi-19.0.0_pre20240525.ebuild b/sys-libs/libcxxabi/libcxxabi-19.0.0_pre20240525.ebuild
new file mode 100644
index 000000000000..d45de5993114
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-19.0.0_pre20240525.ebuild
@@ -0,0 +1,110 @@
+# 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.org llvm-utils python-any-r1
+inherit 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[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	llvm_prepend_path "${LLVM_MAJOR}"
+
+	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/libcxxabi/libcxxabi-19.0.0_pre20240608.ebuild b/sys-libs/libcxxabi/libcxxabi-19.0.0_pre20240608.ebuild
new file mode 100644
index 000000000000..903f8e866cb6
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-19.0.0_pre20240608.ebuild
@@ -0,0 +1,110 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..13} )
+inherit cmake-multilib flag-o-matic llvm.org llvm-utils python-any-r1
+inherit 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[${PYTHON_USEDEP}]"
+}
+
+multilib_src_configure() {
+	llvm_prepend_path "${LLVM_MAJOR}"
+
+	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/libcxxabi/metadata.xml b/sys-libs/libcxxabi/metadata.xml
index 78c7d7d981b6..9dfed369952d 100644
--- a/sys-libs/libcxxabi/metadata.xml
+++ b/sys-libs/libcxxabi/metadata.xml
@@ -1,10 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
 	<maintainer type="project">
 		<email>llvm@gentoo.org</email>
 	</maintainer>
 	<use>
-		<flag name="libunwind">Use libunwind instead of libgcc_s for stack unwinding, thus avoiding dependency on gcc</flag>
+		<flag name="clang">Force building using installed clang (rather
+			than the default CC/CXX; required for testing).</flag>
 	</use>
+	<upstream>
+		<remote-id type="github">llvm/llvm-project</remote-id>
+	</upstream>
 </pkgmetadata>