20 files changed, 933 insertions, 20 deletions
diff --git a/sys-libs/Manifest.gz b/sys-libs/Manifest.gz
index 9d74ad5749ec..ca15b46f0f48 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 7c6ede9a0d6f..7e8b4ddf931f 100644
--- a/sys-libs/compiler-rt-sanitizers/Manifest
+++ b/sys-libs/compiler-rt-sanitizers/Manifest
@@ -6,10 +6,12 @@ DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3
 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-rc1.tar.gz 134261735 BLAKE2B d29510495641c06e6d7a5ac165e6d34e0ba15d1a5b786534e186e341e3a0550cdd3d8a2b61deb3e2bf44c0b0ff8561224bf7f8cebc2ce9415639cb67ceae289e SHA512 4595a26df56eed7d5941240fe92116ad2f1c61639f0f464697c2c530a601347032fbad6802d1fa915ced8574c7b30ef05bc8c0be737784c844d3860892817e6e
+DIST llvmorg-12.0.1-rc2.tar.gz 134274147 BLAKE2B 2d3f6ce8d5239cf2e5ea52f4b9020d6a8fedb8d6a4df02ca0d8e4398237f4eb967865e1e65570d16cd191865281b9619a63905c1e1c47b31183b881e97e49867 SHA512 cdebb954016dc92251cd9c6281804f7a36e7bc8c6f101a6817d96cc121aba4d361fb99501c259409a29c90d7749b224be670c41177fe43fa64b730ff294831b8
 EBUILD compiler-rt-sanitizers-10.0.1-r1.ebuild 4513 BLAKE2B be188f8bef66099999a98b033ff18f132a1697beb8606f44a7bcaacabff7123439b09e4a34e03be51eebba4b4059461b5953888a99753fa7c58dab7ae3f89337 SHA512 97bb314099bdc4b4f237eca31da1d0ac5bf548c05a2691fa0c6c5308979fd654649ccf8e121cb1529b6261bd1045d55ca6e0bd851d3b8896d46f13f8becee821
 EBUILD compiler-rt-sanitizers-11.1.0-r1.ebuild 6036 BLAKE2B 0b573d9345f36f750283574bd5f2efe8d60ced8448a700b3571a2303a26a79fa1240c6347d28ba810f7619afc58afcd3e369b2a7769b3a2ebc303919701eddbe SHA512 960d2f6ee96dcefbe3cb9b6637676cc1f16cbb2904bb6913b6d1807afae61229d7774bebe0d3e50fff62bf7fcf5c289ad8b7a5c614ae2589b9b3c891103606ef
 EBUILD compiler-rt-sanitizers-12.0.0.ebuild 6085 BLAKE2B 4571a815cf55d95ad179e22ae351163e4df99634db9b89217b1ba17281b4945521bb99f03934fc97385d2854902dcd606939c4219a633935f78673c2475cbe9c SHA512 650437aa5152276a2cedfe8dbb2e1a43405f134702670f94f0434f54ccd837a5ec062417c7536581e9778a12012724872f4eaa9fbae5d2e51645d8016d39d262
 EBUILD compiler-rt-sanitizers-12.0.1.9999.ebuild 5885 BLAKE2B 7369edb9da3e3915eb72e684efa29e7a9b895211f400c8e2957495eff732afcf33d3b9a2d2a86fcfd973958eb7a9e5c49269b1221a7c30c5736d2dd284738445 SHA512 85df50370833bff9c73ebb6d11307349f6a437fd673aef608aa525fdf766f71debccc5ff0959253fc9f662050e727859625ce75cbee2e5084deaa07fcfe67d8a
 EBUILD compiler-rt-sanitizers-12.0.1_rc1.ebuild 5885 BLAKE2B 7369edb9da3e3915eb72e684efa29e7a9b895211f400c8e2957495eff732afcf33d3b9a2d2a86fcfd973958eb7a9e5c49269b1221a7c30c5736d2dd284738445 SHA512 85df50370833bff9c73ebb6d11307349f6a437fd673aef608aa525fdf766f71debccc5ff0959253fc9f662050e727859625ce75cbee2e5084deaa07fcfe67d8a
+EBUILD compiler-rt-sanitizers-12.0.1_rc2.ebuild 5885 BLAKE2B 7369edb9da3e3915eb72e684efa29e7a9b895211f400c8e2957495eff732afcf33d3b9a2d2a86fcfd973958eb7a9e5c49269b1221a7c30c5736d2dd284738445 SHA512 85df50370833bff9c73ebb6d11307349f6a437fd673aef608aa525fdf766f71debccc5ff0959253fc9f662050e727859625ce75cbee2e5084deaa07fcfe67d8a
 EBUILD compiler-rt-sanitizers-13.0.0.9999.ebuild 5885 BLAKE2B 7369edb9da3e3915eb72e684efa29e7a9b895211f400c8e2957495eff732afcf33d3b9a2d2a86fcfd973958eb7a9e5c49269b1221a7c30c5736d2dd284738445 SHA512 85df50370833bff9c73ebb6d11307349f6a437fd673aef608aa525fdf766f71debccc5ff0959253fc9f662050e727859625ce75cbee2e5084deaa07fcfe67d8a
 MISC metadata.xml 1341 BLAKE2B 27ba2b57b7ba21538680b5535aec8b0e8e772a040b25ac8c9285765ed00a485a01ce6dd47c32686c7d162d072f4d6d7d2e1a790e9bd867b61a460b01ad79bade SHA512 909a922e1b0e9649534d88bb7692b1d1d7a9d3d539a4926054dac834d672da065cfea5b2aab02dd23f2a7b0dde0eb0b10ae453990c3ecf99ec20f6a2d2bdbac6
diff --git a/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-12.0.1_rc2.ebuild b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-12.0.1_rc2.ebuild
new file mode 100644
index 000000000000..e96a02172283
--- /dev/null
+++ b/sys-libs/compiler-rt-sanitizers/compiler-rt-sanitizers-12.0.1_rc2.ebuild
@@ -0,0 +1,200 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{7..9} )
+inherit check-reqs cmake flag-o-matic llvm llvm.org python-any-r1
+
+DESCRIPTION="Compiler runtime libraries for clang (sanitizers & xray)"
+HOMEPAGE="https://llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="$(ver_cut 1-3)"
+KEYWORDS=""
+IUSE="+clang test elibc_glibc"
+# base targets
+IUSE+=" +libfuzzer +memprof +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="
+	|| ( ${SANITIZER_FLAGS[*]} libfuzzer profile xray )
+	test? (
+		cfi? ( ubsan )
+		gwp-asan? ( scudo )
+	)"
+RESTRICT="!test? ( test ) !clang? ( test )"
+
+CLANG_SLOT=${SLOT%%.*}
+# llvm-6 for new lit options
+DEPEND="
+	>=sys-devel/llvm-6"
+BDEPEND="
+	>=dev-util/cmake-3.16
+	clang? ( sys-devel/clang )
+	elibc_glibc? ( net-libs/libtirpc )
+	test? (
+		!<sys-apps/sandbox-2.13
+		$(python_gen_any_dep ">=dev-python/lit-5[\${PYTHON_USEDEP}]")
+		=sys-devel/clang-${PV%_*}*:${CLANG_SLOT}
+		sys-libs/compiler-rt:${SLOT}
+	)
+	${PYTHON_DEPS}"
+
+LLVM_COMPONENTS=( compiler-rt )
+LLVM_TEST_COMPONENTS=( llvm/lib/Testing/Support llvm/utils/unittest )
+LLVM_PATCHSET=9999-1
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+check_space() {
+	if use test; then
+		local CHECKREQS_DISK_BUILD=11G
+		check-reqs_pkg_pretend
+	fi
+}
+
+pkg_pretend() {
+	check_space
+}
+
+pkg_setup() {
+	check_space
+	llvm_pkg_setup
+	python-any-r1_pkg_setup
+}
+
+src_prepare() {
+	sed -i -e 's:-Werror::' lib/tsan/go/buildgo.sh || die
+
+	local flag
+	for flag in "${SANITIZER_FLAGS[@]}"; do
+		if ! use "${flag}"; then
+			local cmake_flag=${flag/-/_}
+			sed -i -e "/COMPILER_RT_HAS_${cmake_flag^^}/s:TRUE:FALSE:" \
+				cmake/config-ix.cmake || die
+		fi
+	done
+
+	# TODO: fix these tests to be skipped upstream
+	if use asan && ! use profile; then
+		rm test/asan/TestCases/asan_and_llvm_coverage_test.cpp || die
+	fi
+	if use ubsan && ! use cfi; then
+		> test/cfi/CMakeLists.txt || die
+	fi
+
+	llvm.org_src_prepare
+}
+
+src_configure() {
+	# pre-set since we need to pass it to cmake
+	BUILD_DIR=${WORKDIR}/compiler-rt_build
+
+	if use clang; then
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+	fi
+
+	local flag want_sanitizer=OFF
+	for flag in "${SANITIZER_FLAGS[@]}"; do
+		if use "${flag}"; then
+			want_sanitizer=ON
+			break
+		fi
+	done
+
+	local mycmakeargs=(
+		-DCOMPILER_RT_INSTALL_PATH="${EPREFIX}/usr/lib/clang/${SLOT}"
+		# use a build dir structure consistent with install
+		# this makes it possible to easily deploy test-friendly clang
+		-DCOMPILER_RT_OUTPUT_DIR="${BUILD_DIR}/lib/clang/${SLOT}"
+
+		-DCOMPILER_RT_INCLUDE_TESTS=$(usex test)
+		# builtins & crt installed by sys-libs/compiler-rt
+		-DCOMPILER_RT_BUILD_BUILTINS=OFF
+		-DCOMPILER_RT_BUILD_CRT=OFF
+		-DCOMPILER_RT_BUILD_LIBFUZZER=$(usex libfuzzer)
+		-DCOMPILER_RT_BUILD_MEMPROF=$(usex memprof)
+		-DCOMPILER_RT_BUILD_PROFILE=$(usex profile)
+		-DCOMPILER_RT_BUILD_SANITIZERS="${want_sanitizer}"
+		-DCOMPILER_RT_BUILD_XRAY=$(usex xray)
+
+		-DPython3_EXECUTABLE="${PYTHON}"
+	)
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_MAIN_SRC_DIR="${WORKDIR}/llvm"
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+
+			# they are created during src_test()
+			-DCOMPILER_RT_TEST_COMPILER="${BUILD_DIR}/lib/llvm/${CLANG_SLOT}/bin/clang"
+			-DCOMPILER_RT_TEST_CXX_COMPILER="${BUILD_DIR}/lib/llvm/${CLANG_SLOT}/bin/clang++"
+		)
+
+		# same flags are passed for build & tests, so we need to strip
+		# them down to a subset supported by clang
+		CC=${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang \
+		CXX=${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang++ \
+		strip-unsupported-flags
+	fi
+
+	if use prefix && [[ "${CHOST}" == *-darwin* ]] ; then
+		mycmakeargs+=(
+			# setting -isysroot is disabled with compiler-rt-prefix-paths.patch
+			# this allows adding arm64 support using SDK in EPREFIX
+			-DDARWIN_macosx_CACHED_SYSROOT="${EPREFIX}/MacOSX.sdk"
+			# Set version based on the SDK in EPREFIX
+			# This disables i386 for SDK >= 10.15
+			# Will error if has_use tsan and SDK < 10.12
+			-DDARWIN_macosx_OVERRIDE_SDK_VERSION="$(realpath ${EPREFIX}/MacOSX.sdk | sed -e 's/.*MacOSX\(.*\)\.sdk/\1/')"
+			# Use our libtool instead of looking it up with xcrun
+			-DCMAKE_LIBTOOL="${EPREFIX}/usr/bin/${CHOST}-libtool"
+		)
+	fi
+
+	cmake_src_configure
+
+	if use test; then
+		local sys_dir=( "${EPREFIX}"/usr/lib/clang/${SLOT}/lib/* )
+		[[ -e ${sys_dir} ]] || die "Unable to find ${sys_dir}"
+		[[ ${#sys_dir[@]} -eq 1 ]] || die "Non-deterministic compiler-rt install: ${sys_dir[*]}"
+
+		# copy clang over since resource_dir is located relatively to binary
+		# therefore, we can put our new libraries in it
+		mkdir -p "${BUILD_DIR}"/lib/{llvm/${CLANG_SLOT}/{bin,$(get_libdir)},clang/${SLOT}/include} || die
+		cp "${EPREFIX}"/usr/lib/llvm/${CLANG_SLOT}/bin/clang{,++} \
+			"${BUILD_DIR}"/lib/llvm/${CLANG_SLOT}/bin/ || die
+		cp "${EPREFIX}"/usr/lib/clang/${SLOT}/include/*.h \
+			"${BUILD_DIR}"/lib/clang/${SLOT}/include/ || die
+		cp "${sys_dir}"/*builtins*.a \
+			"${BUILD_DIR}/lib/clang/${SLOT}/lib/${sys_dir##*/}/" || die
+		# we also need LLVMgold.so for gold-based tests
+		if [[ -f ${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/$(get_libdir)/LLVMgold.so ]]; then
+			ln -s "${EPREFIX}"/usr/lib/llvm/${CLANG_SLOT}/$(get_libdir)/LLVMgold.so \
+				"${BUILD_DIR}"/lib/llvm/${CLANG_SLOT}/$(get_libdir)/ || die
+		fi
+	fi
+}
+
+src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	# disable sandbox to have it stop clobbering LD_PRELOAD
+	local -x SANDBOX_ON=0
+	# wipe LD_PRELOAD to make ASAN happy
+	local -x LD_PRELOAD=
+
+	cmake_build check-all
+}
diff --git a/sys-libs/compiler-rt/Manifest b/sys-libs/compiler-rt/Manifest
index a88cfbf61460..d27adb555fe3 100644
--- a/sys-libs/compiler-rt/Manifest
+++ b/sys-libs/compiler-rt/Manifest
@@ -6,10 +6,12 @@ DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3
 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-rc1.tar.gz 134261735 BLAKE2B d29510495641c06e6d7a5ac165e6d34e0ba15d1a5b786534e186e341e3a0550cdd3d8a2b61deb3e2bf44c0b0ff8561224bf7f8cebc2ce9415639cb67ceae289e SHA512 4595a26df56eed7d5941240fe92116ad2f1c61639f0f464697c2c530a601347032fbad6802d1fa915ced8574c7b30ef05bc8c0be737784c844d3860892817e6e
+DIST llvmorg-12.0.1-rc2.tar.gz 134274147 BLAKE2B 2d3f6ce8d5239cf2e5ea52f4b9020d6a8fedb8d6a4df02ca0d8e4398237f4eb967865e1e65570d16cd191865281b9619a63905c1e1c47b31183b881e97e49867 SHA512 cdebb954016dc92251cd9c6281804f7a36e7bc8c6f101a6817d96cc121aba4d361fb99501c259409a29c90d7749b224be670c41177fe43fa64b730ff294831b8
 EBUILD compiler-rt-10.0.1.ebuild 2782 BLAKE2B cdc7937f616e86c3394d1cc68eeea05f3eebdcac051ca48e477d3a2cb765be1d616159f72a2b77ac21a0c2a4ebf1cc79f9d9cd23a2a1c7b26a4a252142c3af21 SHA512 4380bb10112f745e0034d36be105a1b4df159f34adafdd2b24157dc3652881ab8792e7758555ce167f59e2c3360b5d36b5d4f8d456df44fa5ee754f3c310677a
 EBUILD compiler-rt-11.1.0.ebuild 3506 BLAKE2B fea54ca4aabe9bf35afc64a579ae18eb4491eeecb58ede43369ba9c294f624851214525f399cfa3adadee70ca66cbe64821376272b9965304266bcfc07b9f220 SHA512 f50906ee9f3b044a251ddd56db6ce10d3d2b632ffa7d3fd608cc5d7320e8d4b47b1ada26965b5fc9bb746e77c1b01ec61b5f719bc6bb2805720df035fca993da
 EBUILD compiler-rt-12.0.0.ebuild 3545 BLAKE2B 98aa5cd6f5ad6f5570d432811731dc96ed330f7d923628edbf5fd58a24f28f2c70c5e7ef912f5c367c0de6a38e4b06cca4bfc8f412f377d507e64df611757ffd SHA512 e4345c91a92b697641eeb621102a35d287c8c690eba039a160f98ef12f93f33bcf1d35f5f3c6341eb07be62678a601567152cc908786fb3d4f70995fe94ace58
 EBUILD compiler-rt-12.0.1.9999.ebuild 3471 BLAKE2B d45d3843d7a644b4b9739c3b0db74b102235b2c418ceb7cf13410bef9fec17cebbdad0fec1563cb3b5122db96ccca520e13acd7967027b466a315f23147ed57a SHA512 bb3e2c1c852e5182f73b9a22a13fe5013adabaf34526be7e775412caaae078b6b81d9a66db38b3f0ccf61bed72b52f94ddca793f257d91de1a31e400a45fa23d
 EBUILD compiler-rt-12.0.1_rc1.ebuild 3471 BLAKE2B d45d3843d7a644b4b9739c3b0db74b102235b2c418ceb7cf13410bef9fec17cebbdad0fec1563cb3b5122db96ccca520e13acd7967027b466a315f23147ed57a SHA512 bb3e2c1c852e5182f73b9a22a13fe5013adabaf34526be7e775412caaae078b6b81d9a66db38b3f0ccf61bed72b52f94ddca793f257d91de1a31e400a45fa23d
+EBUILD compiler-rt-12.0.1_rc2.ebuild 3471 BLAKE2B d45d3843d7a644b4b9739c3b0db74b102235b2c418ceb7cf13410bef9fec17cebbdad0fec1563cb3b5122db96ccca520e13acd7967027b466a315f23147ed57a SHA512 bb3e2c1c852e5182f73b9a22a13fe5013adabaf34526be7e775412caaae078b6b81d9a66db38b3f0ccf61bed72b52f94ddca793f257d91de1a31e400a45fa23d
 EBUILD compiler-rt-13.0.0.9999.ebuild 3471 BLAKE2B d45d3843d7a644b4b9739c3b0db74b102235b2c418ceb7cf13410bef9fec17cebbdad0fec1563cb3b5122db96ccca520e13acd7967027b466a315f23147ed57a SHA512 bb3e2c1c852e5182f73b9a22a13fe5013adabaf34526be7e775412caaae078b6b81d9a66db38b3f0ccf61bed72b52f94ddca793f257d91de1a31e400a45fa23d
 MISC metadata.xml 333 BLAKE2B fc411d2ccf9b848ed7ba71d6a1eb01c54237a38e3c612c22d39549f6b23ebc3179dd08c855852a72b9a4f4ae89418a078048702324df27b4fac11c36e80f846b SHA512 ca50c4e5ef7d52c167bca6a4ab2961a1f7f82d0e84722ec65b8ae44d0ff8a4a7db1dce630f6f18f7b526f77c432af7ebc9a29564659631bad1e3900b6f1df49b
diff --git a/sys-libs/compiler-rt/compiler-rt-12.0.1_rc2.ebuild b/sys-libs/compiler-rt/compiler-rt-12.0.1_rc2.ebuild
new file mode 100644
index 000000000000..caf0b9268efd
--- /dev/null
+++ b/sys-libs/compiler-rt/compiler-rt-12.0.1_rc2.ebuild
@@ -0,0 +1,124 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{7..9} )
+inherit cmake flag-o-matic llvm llvm.org python-any-r1 toolchain-funcs
+
+DESCRIPTION="Compiler runtime library for clang (built-in part)"
+HOMEPAGE="https://llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="$(ver_cut 1-3)"
+KEYWORDS=""
+IUSE="+clang test"
+RESTRICT="!test? ( test ) !clang? ( test )"
+
+CLANG_SLOT=${SLOT%%.*}
+# llvm-6 for new lit options
+DEPEND="
+	>=sys-devel/llvm-6"
+BDEPEND="
+	>=dev-util/cmake-3.16
+	clang? ( sys-devel/clang )
+	test? (
+		$(python_gen_any_dep ">=dev-python/lit-9.0.1[\${PYTHON_USEDEP}]")
+		=sys-devel/clang-${PV%_*}*:${CLANG_SLOT}
+	)
+	${PYTHON_DEPS}"
+
+LLVM_COMPONENTS=( compiler-rt )
+LLVM_PATCHSET=9999-1
+llvm.org_set_globals
+
+python_check_deps() {
+	use test || return 0
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+pkg_pretend() {
+	if ! use clang && ! tc-is-clang; then
+		ewarn "Building using a compiler other than clang may result in broken atomics"
+		ewarn "library. Enable USE=clang unless you have a very good reason not to."
+	fi
+}
+
+pkg_setup() {
+	# Darwin Prefix builds do not have llvm installed yet, so rely on
+	# bootstrap-prefix to set the appropriate path vars to LLVM instead
+	# of using llvm_pkg_setup.
+	if [[ ${CHOST} != *-darwin* ]] || has_version dev-lang/llvm; then
+		llvm_pkg_setup
+	fi
+	python-any-r1_pkg_setup
+}
+
+test_compiler() {
+	$(tc-getCC) ${CFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c - \
+		<<<'int main() { return 0; }' &>/dev/null
+}
+
+src_configure() {
+	# pre-set since we need to pass it to cmake
+	BUILD_DIR=${WORKDIR}/${P}_build
+
+	local nolib_flags=( -nodefaultlibs -lc )
+	if use clang; then
+		local -x CC=${CHOST}-clang
+		local -x CXX=${CHOST}-clang++
+		strip-unsupported-flags
+		# ensure we can use clang before installing compiler-rt
+		local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
+	elif ! test_compiler; then
+		if test_compiler "${nolib_flags[@]}"; then
+			local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
+			ewarn "${CC} seems to lack runtime, trying with ${nolib_flags[*]}"
+		fi
+	fi
+
+	local mycmakeargs=(
+		-DCOMPILER_RT_INSTALL_PATH="${EPREFIX}/usr/lib/clang/${SLOT}"
+
+		-DCOMPILER_RT_INCLUDE_TESTS=$(usex test)
+		-DCOMPILER_RT_BUILD_LIBFUZZER=OFF
+		-DCOMPILER_RT_BUILD_MEMPROF=OFF
+		-DCOMPILER_RT_BUILD_PROFILE=OFF
+		-DCOMPILER_RT_BUILD_SANITIZERS=OFF
+		-DCOMPILER_RT_BUILD_XRAY=OFF
+
+		-DPython3_EXECUTABLE="${PYTHON}"
+	)
+
+	if use prefix && [[ "${CHOST}" == *-darwin* ]] ; then
+		mycmakeargs+=(
+			# setting -isysroot is disabled with compiler-rt-prefix-paths.patch
+			# this allows adding arm64 support using SDK in EPREFIX
+			-DDARWIN_macosx_CACHED_SYSROOT="${EPREFIX}/MacOSX.sdk"
+			# Set version based on the SDK in EPREFIX.
+			# This disables i386 for SDK >= 10.15
+			-DDARWIN_macosx_OVERRIDE_SDK_VERSION="$(realpath ${EPREFIX}/MacOSX.sdk | sed -e 's/.*MacOSX\(.*\)\.sdk/\1/')"
+			# Use our libtool instead of looking it up with xcrun
+			-DCMAKE_LIBTOOL="${EPREFIX}/usr/bin/${CHOST}-libtool"
+		)
+	fi
+
+	if use test; then
+		mycmakeargs+=(
+			-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+			-DLLVM_LIT_ARGS="$(get_lit_flags)"
+
+			-DCOMPILER_RT_TEST_COMPILER="${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang"
+			-DCOMPILER_RT_TEST_CXX_COMPILER="${EPREFIX}/usr/lib/llvm/${CLANG_SLOT}/bin/clang++"
+		)
+	fi
+
+	cmake_src_configure
+}
+
+src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+
+	cmake_build check-builtins
+}
diff --git a/sys-libs/glibc/Manifest b/sys-libs/glibc/Manifest
index b25dac6e3499..ec48e97a7a13 100644
--- a/sys-libs/glibc/Manifest
+++ b/sys-libs/glibc/Manifest
@@ -32,7 +32,7 @@ EBUILD glibc-2.25-r11.ebuild 6071 BLAKE2B aed6cdc8141eb47e7f734ca59e98314d0c5340
 EBUILD glibc-2.30-r9.ebuild 43403 BLAKE2B 039f1e866d0ecbe7e6805265694800ed4873a5643b5ccbaedd18c24ab42bdb2797bd4a597d3cb5321a527eb4feda555b31a143ce80f984774f2ae5498b57c45f SHA512 b9843ca092e6814b23ac1b9741bec02bd9d54a6d48df3caf451e65eae8db2068137a425c9d03d86daccdf67c856f8bf1c8200b8c95461fcbc7aa790599fdccd6
 EBUILD glibc-2.31-r7.ebuild 44522 BLAKE2B 1adfba68c35d3af5ec8476b2fe5d3bebf13880eeacb5aaa8438b41b98f5b275f0816a0e654446f62ee2f34f412c5c6e72befcc0deb8988b6faec2c53a07601a9 SHA512 5247b1d75efa86b1a1c85a09219f54d402aae8aaecf0e377ca663a984daf7c69ea97b3072fe83a20002ec7d72661ec7737fbc72982122b58c26cb5bc89997548
 EBUILD glibc-2.32-r8.ebuild 44853 BLAKE2B 724f95c0ed2cda18dc2edcaa03b0783a2bc603b72a67e1451535040ddc83be6d1a90ad4b30f9623140b5c0a329ecafb6f19793390137e629d43a3c26e202b28a SHA512 0973b86c266e40203e301cf0c6f8fddc4273c002ffb8fd6c16f6e78f2cfdfbea95fda04adfebb8ee84a14dc950763ba706eadadb2e83f7982b800bee636d5d8f
-EBUILD glibc-2.33-r1.ebuild 45023 BLAKE2B 9e900bf100a7242efa2023ac31191bb3983600c93e933c1a41dff16cb0ebf0c7fb2bfd3e98e08cda854c475f1bc79c008f0f6fdc1835eb27332c29b60d8562a6 SHA512 cbfe1246fffa6f0789a09a5dd8bb1415d587b106aaf375280b65033ee3fe0bb8cf708d0ec56fee4c61a090288d9487f34bafcb7900457c484e1c990fc55db49f
+EBUILD glibc-2.33-r1.ebuild 45214 BLAKE2B ea9dab58bfaf378357bb9a3dd7759926b0cf1489c9782263d2abc850f8bc71d755c400919ddc29801eea40d13ed96cf83404f0009cf7680e4c8733b829995dbf SHA512 d5846e7f146776ae4d687807593b6740fc34d01be29323d33584b6038d69fa3898830e421e3c3574df12d7abf9603758f6087eecf2b6aee64b56f164802b6fae
 EBUILD glibc-2.33.ebuild 43992 BLAKE2B b5fd1fa3b2e2b727574028241e7805cab448b37d3975502f12140e2cd6cf98784af36393a1116c13ebaa490db3f18b7b20a56bd53343015abc521201c193eb3f SHA512 911c152ce3ff50ff79db9d53b570ff0fcf837549a072656fef8ad429d02788f89d6ee1266605c539dcbcf273aa791cf075043e8b4895eb8d67404be531631086
-EBUILD glibc-9999.ebuild 45035 BLAKE2B 1868d9c2d762697c31de330955fbfc8a201e15e7f631e2e20fe99eda85716044709a3d1c353841cf2339f040e37bee542a46f95d2e2546bd66319ad7a8130822 SHA512 f8e2257dbffda00fba7c1caad84856944ee9c893ec53ec00cc2b4dbfe1ff2b3f7bc2e9a97c6df93c4b80e416ecdd9320026017e2c0354019ca179c5775662f4b
+EBUILD glibc-9999.ebuild 45226 BLAKE2B fd577636a5b85c4d7610c79e18898ca13aad7643760c7a17f4625964f59b757bbe44eaba7f19c88a17fd1887d8b17fed996465c7ac93d9bbce68ab7ea90576b0 SHA512 38cec7e40c3b2406d86b7ab05f42e5cd9a4556f8444914c2410b589db96a1ec4fd739ceed7f0c550aac90aab4a3f1024100c55364d6eb7612926251b8483f32e
 MISC metadata.xml 1611 BLAKE2B 3bd777c160ea20cdbd86cca791d9fd4ff02f8d100344235ec74fff37d5cae1e7119e0ec26969707e75a983dcdb23e994559c8be128ef40fa0ec9ed655017466d SHA512 08be6d085ac47b140fff17a3be8cee77e066a4536cdce76fa44c77875dec2a9dc236ff67ff44301abf75cb196d1902feb2a139dda420220248b46dd9cdb16b9f
diff --git a/sys-libs/glibc/glibc-2.33-r1.ebuild b/sys-libs/glibc/glibc-2.33-r1.ebuild
index fc5b4b0474f9..5e971e697fef 100644
--- a/sys-libs/glibc/glibc-2.33-r1.ebuild
+++ b/sys-libs/glibc/glibc-2.33-r1.ebuild
@@ -940,6 +940,11 @@ glibc_do_configure() {
 		# -march= option tricks build system to infer too
 		# high ISA level: https://sourceware.org/PR27318
 		libc_cv_include_x86_isa_level=no
+		# Explicit override of https://sourceware.org/PR27991
+		# exposes a bug in glibc's configure:
+		# https://sourceware.org/PR27991
+		libc_cv_have_x86_lahf_sahf=no
+		libc_cv_have_x86_movbe=no
 
 		${EXTRA_ECONF}
 	)
diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index 112a714c393e..e2bc0dad8669 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -941,6 +941,11 @@ glibc_do_configure() {
 		# -march= option tricks build system to infer too
 		# high ISA level: https://sourceware.org/PR27318
 		libc_cv_include_x86_isa_level=no
+		# Explicit override of https://sourceware.org/PR27991
+		# exposes a bug in glibc's configure:
+		# https://sourceware.org/PR27991
+		libc_cv_have_x86_lahf_sahf=no
+		libc_cv_have_x86_movbe=no
 
 		${EXTRA_ECONF}
 	)
diff --git a/sys-libs/libcxx/Manifest b/sys-libs/libcxx/Manifest
index bad1472d2164..4a87cc1e3f8b 100644
--- a/sys-libs/libcxx/Manifest
+++ b/sys-libs/libcxx/Manifest
@@ -6,10 +6,12 @@ DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3
 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-rc1.tar.gz 134261735 BLAKE2B d29510495641c06e6d7a5ac165e6d34e0ba15d1a5b786534e186e341e3a0550cdd3d8a2b61deb3e2bf44c0b0ff8561224bf7f8cebc2ce9415639cb67ceae289e SHA512 4595a26df56eed7d5941240fe92116ad2f1c61639f0f464697c2c530a601347032fbad6802d1fa915ced8574c7b30ef05bc8c0be737784c844d3860892817e6e
+DIST llvmorg-12.0.1-rc2.tar.gz 134274147 BLAKE2B 2d3f6ce8d5239cf2e5ea52f4b9020d6a8fedb8d6a4df02ca0d8e4398237f4eb967865e1e65570d16cd191865281b9619a63905c1e1c47b31183b881e97e49867 SHA512 cdebb954016dc92251cd9c6281804f7a36e7bc8c6f101a6817d96cc121aba4d361fb99501c259409a29c90d7749b224be670c41177fe43fa64b730ff294831b8
 EBUILD libcxx-10.0.1.ebuild 5796 BLAKE2B c3c1e4d49ad96de1338998d35b0495ba2aa448db3558988bbbc9e5d4603d3d2ded354b1c04b186b0134be930edd72c931240ac3a068744e72e18087fc1550160 SHA512 7fbae29d2658305ddac7854a96e353ccf1901fcc6b1c15370d7a69a602f41b7d9f1afdd91018ea5be949955b3f8f1424903b5bac13d840e8f8c72ffcf7d7d34d
 EBUILD libcxx-11.1.0.ebuild 6661 BLAKE2B 93445de819484ea32a708d2ff616501d715e7fd3a3f4204f143e64c40bc89ebceb8e50c80215c6b54d7c8a3cce00fcecaac099298b41e010bf77655563d30a20 SHA512 ce56f24e7b4aed1405e682af6b3cb48bad6617d5b7e2ecf5b990fae4f7d6badc479a583ef24801e34b0155c12354a7b76a414402f89c31f228315eb92f279a62
 EBUILD libcxx-12.0.0.ebuild 6914 BLAKE2B e06a7f82b838785de55c9c936cedd9d4bd3ca819812cf43a98ce533c5f7551d60dec4040f11820068850a23af1111d0a156d398ad8dafefbcc301ed41254855f SHA512 76afcac7759e44a70bc10adc1217446c7c1665f9f1264c2c49363732023e684683df2490d0bc4abd565a04ca1dbf355c8e1bc4d7b88bb2932e0fe35527e0e746
 EBUILD libcxx-12.0.1.9999.ebuild 6622 BLAKE2B b525c9be28a7ac16ec07275c59e68fb003a7423512c94c297014f884d40323b6776313ced81e09f5e15cc1489e95e42b561f8e3e961bc461b37e58ab928edf62 SHA512 335d114c131ed3a6653f59f3a66bdb4115f277b2d8aacd3c2fbc78519b9fdaedaade3a2f53a66f36c18feb3cde8a6fb95fe8e34889626c17dd896bd6a8f8cfad
 EBUILD libcxx-12.0.1_rc1.ebuild 6622 BLAKE2B b525c9be28a7ac16ec07275c59e68fb003a7423512c94c297014f884d40323b6776313ced81e09f5e15cc1489e95e42b561f8e3e961bc461b37e58ab928edf62 SHA512 335d114c131ed3a6653f59f3a66bdb4115f277b2d8aacd3c2fbc78519b9fdaedaade3a2f53a66f36c18feb3cde8a6fb95fe8e34889626c17dd896bd6a8f8cfad
+EBUILD libcxx-12.0.1_rc2.ebuild 6622 BLAKE2B b525c9be28a7ac16ec07275c59e68fb003a7423512c94c297014f884d40323b6776313ced81e09f5e15cc1489e95e42b561f8e3e961bc461b37e58ab928edf62 SHA512 335d114c131ed3a6653f59f3a66bdb4115f277b2d8aacd3c2fbc78519b9fdaedaade3a2f53a66f36c18feb3cde8a6fb95fe8e34889626c17dd896bd6a8f8cfad
 EBUILD libcxx-13.0.0.9999.ebuild 6622 BLAKE2B b525c9be28a7ac16ec07275c59e68fb003a7423512c94c297014f884d40323b6776313ced81e09f5e15cc1489e95e42b561f8e3e961bc461b37e58ab928edf62 SHA512 335d114c131ed3a6653f59f3a66bdb4115f277b2d8aacd3c2fbc78519b9fdaedaade3a2f53a66f36c18feb3cde8a6fb95fe8e34889626c17dd896bd6a8f8cfad
 MISC metadata.xml 621 BLAKE2B d8b68920ece0e3a700f1e425cf72a4ca7e75cf4b0b35e1ac6db9374d32020fc9f62b434da2108ad5b3538a46a2a7f4f5de7aa1640cd4b10046f2480ebb89450d SHA512 e1b0c874a6d229e098ffe7c0c2827502f2cdbf74fb7a0254687a0ca75dde74db06ef2bc79bfe8b526c413b13beac27b8261eab8d0b8df36011790dada3eae421
diff --git a/sys-libs/libcxx/libcxx-12.0.1_rc2.ebuild b/sys-libs/libcxx/libcxx-12.0.1_rc2.ebuild
new file mode 100644
index 000000000000..1f529867fb7b
--- /dev/null
+++ b/sys-libs/libcxx/libcxx-12.0.1_rc2.ebuild
@@ -0,0 +1,211 @@
+# 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="New implementation of the C++ standard library, targeting C++11"
+HOMEPAGE="https://libcxx.llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="elibc_glibc elibc_musl +libcxxabi +libunwind static-libs test"
+REQUIRED_USE="libunwind? ( libcxxabi )"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	libcxxabi? ( ~sys-libs/libcxxabi-${PV}[libunwind=,static-libs?,${MULTILIB_USEDEP}] )
+	!libcxxabi? ( >=sys-devel/gcc-4.7:=[cxx] )"
+# llvm-6 for new lit options
+# clang-3.9.0 installs necessary target symlinks unconditionally
+# which removes the need for MULTILIB_USEDEP
+DEPEND="${RDEPEND}
+	>=sys-devel/llvm-6"
+BDEPEND="
+	test? (
+		>=dev-util/cmake-3.16
+		>=sys-devel/clang-3.9.0
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+	)"
+
+DOCS=( CREDITS.TXT )
+
+LLVM_COMPONENTS=( libcxx{,abi} llvm/{cmake/modules,utils/llvm-lit} )
+LLVM_PATCHSET=9999-1
+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
+
+	if ! use libcxxabi && ! tc-is-gcc ; then
+		eerror "To build ${PN} against libsupc++, you have to use gcc. Other"
+		eerror "compilers are not supported. Please set CC=gcc and CXX=g++"
+		eerror "and try again."
+		die
+	fi
+}
+
+test_compiler() {
+	$(tc-getCXX) ${CXXFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c++ - \
+		<<<'int main() { return 0; }' &>/dev/null
+}
+
+src_configure() {
+	# note: we need to do this before multilib kicks in since it will
+	# alter the CHOST
+	local cxxabi cxxabi_incs
+	if use libcxxabi; then
+		cxxabi=libcxxabi
+		cxxabi_incs="${EPREFIX}/usr/include/libcxxabi"
+	else
+		local gcc_inc="${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() {
+	# we want -lgcc_s for unwinder, and for compiler runtime when using
+	# gcc, clang with gcc runtime (or any unknown compiler)
+	local extra_libs=() want_gcc_s=ON want_compiler_rt=OFF
+	if use libunwind; then
+		# work-around missing -lunwind upstream
+		extra_libs+=( -lunwind )
+		# if we're using libunwind and clang with compiler-rt, we want
+		# to link to compiler-rt instead of -lgcc_s
+		if tc-is-clang; then
+			local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
+			   ${LDFLAGS} -print-libgcc-file-name)
+			if [[ ${compiler_rt} == *libclang_rt* ]]; then
+				want_gcc_s=OFF
+				want_compiler_rt=ON
+				extra_libs+=( "${compiler_rt}" )
+			fi
+		fi
+	elif [[ ${CHOST} == *-darwin* ]] && tc-is-clang; then
+		# clang-based darwin prefix disables libunwind useflag during
+		# bootstrap, because libunwind is not in the prefix yet.
+		# override the default, though, because clang based libcxx
+		# should never use gcc_s on Darwin.
+		want_gcc_s=OFF
+		# compiler_rt is not available in EPREFIX during bootstrap,
+		# so we cannot link to it yet anyway, so keep the defaults
+		# of want_compiler_rt=OFF and extra_libs=()
+	fi
+
+	# bootstrap: cmake is unhappy if compiler can't link to stdlib
+	local nolib_flags=( -nodefaultlibs -lc )
+	if ! test_compiler; then
+		if test_compiler "${nolib_flags[@]}"; then
+			local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
+			ewarn "${CXX} seems to lack runtime, trying with ${nolib_flags[*]}"
+		fi
+	fi
+
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		-DLIBCXX_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=$(usex elibc_musl)
+		-DLIBCXX_HAS_GCC_S_LIB=${want_gcc_s}
+		-DLIBCXX_INCLUDE_TESTS=$(usex test)
+		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+		-DCMAKE_SHARED_LINKER_FLAGS="${extra_libs[*]} ${LDFLAGS}"
+	)
+
+	if use test; then
+		local clang_path=$(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="${PYTHON}"
+		)
+	fi
+	cmake_src_configure
+}
+
+multilib_src_test() {
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check-cxx
+}
+
+# Usage: deps
+gen_ldscript() {
+	local output_format
+	output_format=$($(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 ( $@ )
+END_LDSCRIPT
+}
+
+gen_static_ldscript() {
+	local libdir=$(get_libdir)
+	local cxxabi_lib=$(usex libcxxabi "libc++abi.a" "libsupc++.a")
+
+	# Move it first.
+	mv "${ED}/usr/${libdir}/libc++.a" "${ED}/usr/${libdir}/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 ${cxxabi_lib} $(usex libunwind libunwind.a libgcc_eh.a)"
+	# On Linux/glibc it does not link without libpthread or libdl. It is
+	# fine on FreeBSD.
+	use elibc_glibc && deps+=" libpthread.a libdl.a"
+
+	gen_ldscript "${deps}" > "${ED}/usr/${libdir}/libc++.a" || die
+}
+
+gen_shared_ldscript() {
+	local libdir=$(get_libdir)
+	# libsupc++ doesn't have a shared version
+	local cxxabi_lib=$(usex libcxxabi "libc++abi.so" "libsupc++.a")
+
+	mv "${ED}/usr/${libdir}/libc++.so" "${ED}/usr/${libdir}/libc++_shared.so" || die
+	local deps="libc++_shared.so ${cxxabi_lib} $(usex libunwind libunwind.so libgcc_s.so)"
+
+	gen_ldscript "${deps}" > "${ED}/usr/${libdir}/libc++.so" || die
+}
+
+multilib_src_install() {
+	cmake_src_install
+	if [[ ${CHOST} != *-darwin* ]] ; then
+		gen_shared_ldscript
+		use static-libs && gen_static_ldscript
+	fi
+}
+
+pkg_postinst() {
+	elog "This package (${PN}) is mainly intended as a replacement for the C++"
+	elog "standard library when using clang."
+	elog "To use it, instead of libstdc++, use:"
+	elog "    clang++ -stdlib=libc++"
+	elog "to compile your C++ programs."
+}
diff --git a/sys-libs/libcxxabi/Manifest b/sys-libs/libcxxabi/Manifest
index be21b3d8a287..d757257f6a59 100644
--- a/sys-libs/libcxxabi/Manifest
+++ b/sys-libs/libcxxabi/Manifest
@@ -2,10 +2,12 @@ DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3
 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-rc1.tar.gz 134261735 BLAKE2B d29510495641c06e6d7a5ac165e6d34e0ba15d1a5b786534e186e341e3a0550cdd3d8a2b61deb3e2bf44c0b0ff8561224bf7f8cebc2ce9415639cb67ceae289e SHA512 4595a26df56eed7d5941240fe92116ad2f1c61639f0f464697c2c530a601347032fbad6802d1fa915ced8574c7b30ef05bc8c0be737784c844d3860892817e6e
+DIST llvmorg-12.0.1-rc2.tar.gz 134274147 BLAKE2B 2d3f6ce8d5239cf2e5ea52f4b9020d6a8fedb8d6a4df02ca0d8e4398237f4eb967865e1e65570d16cd191865281b9619a63905c1e1c47b31183b881e97e49867 SHA512 cdebb954016dc92251cd9c6281804f7a36e7bc8c6f101a6817d96cc121aba4d361fb99501c259409a29c90d7749b224be670c41177fe43fa64b730ff294831b8
 EBUILD libcxxabi-10.0.1.ebuild 3237 BLAKE2B 828cabd1bccb0f7dc672648fd1143f1913df2b3f075194da3b053413ad8e0ff8f8669ce6263fa51ed0b02702e0bd611a77f4009e57a7d2659362db21c5665e4e SHA512 b9fef273fea1343aab604c3606fa4b9ed340e0e6f649e68f81f1285d96374f440ab787937b203ee5eba5b8e867a5926b48f63d8739c326fd1a646193635dd65e
 EBUILD libcxxabi-11.1.0.ebuild 3559 BLAKE2B dc74318b252f772fbc6833e413ee2dd9b682c01ae3bca88a78d2f7854aa374311474f7af9f19453e4b4fbb6db4149e8330db7632faf710a0aeb2e0d741119096 SHA512 18632637cb6fb86a3c003ba66f6a80aece299f50e356870599bb932fa100ba3e51293cee71576cc994a7e2b5f56f3b4ec8b4d3eae6202322d50a9bc0aa922ac3
 EBUILD libcxxabi-12.0.0.ebuild 3546 BLAKE2B b6accd4747ac9a1b30161de15e961062819e527c39a4d8a6e755e58a75862b1b12162539bf9716db2be8739b9aa2fefe16cede125b504e9d5e2d60f291fe8e35 SHA512 2fb42faa0ac7d7e5d1651494264163857561eb746ea381030bf03495152c8c060cb0be0793ba96f1ec5c4c9e3ea88b48644f587b4f52979c7eadad6992809e0a
 EBUILD libcxxabi-12.0.1.9999.ebuild 3505 BLAKE2B fe4d762e646ab8a6daad3ca1da7d63c34ffb6735a6bb6657e03e724428422706d821057715369cd818ecc696453620d7f2473535ac031ec0cc0a5bc6f4ec2186 SHA512 40ce77407d30efc2ada70d0166bcadbc4140e33275ecf537dcbd7580e3e8fc9ff030a29ba6be4a67bcadc9835ee8b1a2cd3fef07085c57df4792c04b445b0d7b
 EBUILD libcxxabi-12.0.1_rc1.ebuild 3505 BLAKE2B fe4d762e646ab8a6daad3ca1da7d63c34ffb6735a6bb6657e03e724428422706d821057715369cd818ecc696453620d7f2473535ac031ec0cc0a5bc6f4ec2186 SHA512 40ce77407d30efc2ada70d0166bcadbc4140e33275ecf537dcbd7580e3e8fc9ff030a29ba6be4a67bcadc9835ee8b1a2cd3fef07085c57df4792c04b445b0d7b
+EBUILD libcxxabi-12.0.1_rc2.ebuild 3505 BLAKE2B fe4d762e646ab8a6daad3ca1da7d63c34ffb6735a6bb6657e03e724428422706d821057715369cd818ecc696453620d7f2473535ac031ec0cc0a5bc6f4ec2186 SHA512 40ce77407d30efc2ada70d0166bcadbc4140e33275ecf537dcbd7580e3e8fc9ff030a29ba6be4a67bcadc9835ee8b1a2cd3fef07085c57df4792c04b445b0d7b
 EBUILD libcxxabi-13.0.0.9999.ebuild 3505 BLAKE2B fe4d762e646ab8a6daad3ca1da7d63c34ffb6735a6bb6657e03e724428422706d821057715369cd818ecc696453620d7f2473535ac031ec0cc0a5bc6f4ec2186 SHA512 40ce77407d30efc2ada70d0166bcadbc4140e33275ecf537dcbd7580e3e8fc9ff030a29ba6be4a67bcadc9835ee8b1a2cd3fef07085c57df4792c04b445b0d7b
 MISC metadata.xml 350 BLAKE2B 67b70b8d7292327882a845b76667ce24fee728cd84f27ed7e329bc7963631cba4c28bafce5e6a5fefb4ba1df5c7fd572b3b0d7a2b31ef649496f2f991b691bff SHA512 317dd7b59a711dd0461b5369f7e31ea196882b018e047e1dbae8077274d06cb68542c8762efb852cce0b8021bedea69c19aa0c124b9414a36cf1a9c00e0b9703
diff --git a/sys-libs/libcxxabi/libcxxabi-12.0.1_rc2.ebuild b/sys-libs/libcxxabi/libcxxabi-12.0.1_rc2.ebuild
new file mode 100644
index 000000000000..8c24d9691115
--- /dev/null
+++ b/sys-libs/libcxxabi/libcxxabi-12.0.1_rc2.ebuild
@@ -0,0 +1,122 @@
+# 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=""
+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/libomp/Manifest b/sys-libs/libomp/Manifest
index 792825390737..6c3a8eae469a 100644
--- a/sys-libs/libomp/Manifest
+++ b/sys-libs/libomp/Manifest
@@ -2,10 +2,12 @@ DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3
 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-rc1.tar.gz 134261735 BLAKE2B d29510495641c06e6d7a5ac165e6d34e0ba15d1a5b786534e186e341e3a0550cdd3d8a2b61deb3e2bf44c0b0ff8561224bf7f8cebc2ce9415639cb67ceae289e SHA512 4595a26df56eed7d5941240fe92116ad2f1c61639f0f464697c2c530a601347032fbad6802d1fa915ced8574c7b30ef05bc8c0be737784c844d3860892817e6e
+DIST llvmorg-12.0.1-rc2.tar.gz 134274147 BLAKE2B 2d3f6ce8d5239cf2e5ea52f4b9020d6a8fedb8d6a4df02ca0d8e4398237f4eb967865e1e65570d16cd191865281b9619a63905c1e1c47b31183b881e97e49867 SHA512 cdebb954016dc92251cd9c6281804f7a36e7bc8c6f101a6817d96cc121aba4d361fb99501c259409a29c90d7749b224be670c41177fe43fa64b730ff294831b8
 EBUILD libomp-10.0.1.ebuild 2893 BLAKE2B 6085966e4e392ded8492c6b398d3a14ba5205aee8ecf3f63d0853e463f1bf007ff3b3c31555eb7cb566cc8c4bdc580e9d0ce38ca7cd58785820a7949e2969024 SHA512 e1b7b17dd0800908adbb06b29c7ef2d5bd73c66784104b554c59e5c5176c9c49c5432e0ecd72c6e3c00e71def839342cbedbd666f3886afa3ea92d8fc94ba591
 EBUILD libomp-11.1.0.ebuild 2901 BLAKE2B e18155f24e5d0aa2de9a1976c818777e8d2d16092aa5e58b5c38197461a0b4ca5967ec161140b2a63835a0cfa601eb31fc08cbaa492088269808d6d803c7a47a SHA512 23a429ded341114ea3c4282b974520146ea0734e01b5863c837d119517b39365b537126091f5efcf752ca7860bccf0e0e2d763b507e903321532db87bcd42b79
 EBUILD libomp-12.0.0.ebuild 2951 BLAKE2B 347b96e146742f7127314e3eb35ee13a3f040b3ab87aba7570a12cf1a2d44f918b110059d7a821b349224b7233d13be0ad110acf5cd2e4328762ed1e52bd665a SHA512 acb0a94b89b6f9f7a67a8cb20976e0cf0cfddc05d3e7fcd198d4cf3ab3742f5b80f88c4b39be71d3c89201010f936bf4981736ed2a21975b0a43e3898cc90693
 EBUILD libomp-12.0.1.9999.ebuild 2885 BLAKE2B a4ae00d8e2500cc8c76999c17624a3a2ebe6107c34f9deb90cb12de77c4656dd110275e073ab9413332f0fa9c2a86d860a620c85a36555e5996d358c1e25e522 SHA512 ba72ef7a346ac74297526df15949395a18750625b048c26650a7cdec4212af72dcb2b9c8d68dc117abeb7bce9aba4f0b0de1134bcacd841d1a475f77f4a77157
 EBUILD libomp-12.0.1_rc1.ebuild 2885 BLAKE2B a4ae00d8e2500cc8c76999c17624a3a2ebe6107c34f9deb90cb12de77c4656dd110275e073ab9413332f0fa9c2a86d860a620c85a36555e5996d358c1e25e522 SHA512 ba72ef7a346ac74297526df15949395a18750625b048c26650a7cdec4212af72dcb2b9c8d68dc117abeb7bce9aba4f0b0de1134bcacd841d1a475f77f4a77157
+EBUILD libomp-12.0.1_rc2.ebuild 2885 BLAKE2B a4ae00d8e2500cc8c76999c17624a3a2ebe6107c34f9deb90cb12de77c4656dd110275e073ab9413332f0fa9c2a86d860a620c85a36555e5996d358c1e25e522 SHA512 ba72ef7a346ac74297526df15949395a18750625b048c26650a7cdec4212af72dcb2b9c8d68dc117abeb7bce9aba4f0b0de1134bcacd841d1a475f77f4a77157
 EBUILD libomp-13.0.0.9999.ebuild 2885 BLAKE2B a4ae00d8e2500cc8c76999c17624a3a2ebe6107c34f9deb90cb12de77c4656dd110275e073ab9413332f0fa9c2a86d860a620c85a36555e5996d358c1e25e522 SHA512 ba72ef7a346ac74297526df15949395a18750625b048c26650a7cdec4212af72dcb2b9c8d68dc117abeb7bce9aba4f0b0de1134bcacd841d1a475f77f4a77157
 MISC metadata.xml 825 BLAKE2B 9c4afd81e02ecba9db7cac8487acf4e9dcbf772d62ee46c5c95510f1c624b52e0005786d06c119d4d7f0bf498fbd9cae2f9200a27ea427c9d6e83a5d74d45c1c SHA512 b2ba293ffb87f06c21172607234e8f69730d8ade0732fe98a5bc876353a01853dbef8cbe0ace0f6a556f2ae7217facee040349b460815dc2cf2f3b48cfd46762
diff --git a/sys-libs/libomp/libomp-12.0.1_rc2.ebuild b/sys-libs/libomp/libomp-12.0.1_rc2.ebuild
new file mode 100644
index 000000000000..0fd7afe0ff42
--- /dev/null
+++ b/sys-libs/libomp/libomp-12.0.1_rc2.ebuild
@@ -0,0 +1,106 @@
+# 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 linux-info llvm.org python-any-r1
+
+DESCRIPTION="OpenMP runtime library for LLVM/clang compiler"
+HOMEPAGE="https://openmp.llvm.org"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="cuda hwloc kernel_linux offload ompt test"
+# CUDA works only with the x86_64 ABI
+REQUIRED_USE="offload? ( cuda? ( abi_x86_64 ) )"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	hwloc? ( sys-apps/hwloc:0=[${MULTILIB_USEDEP}] )
+	offload? (
+		virtual/libelf:=[${MULTILIB_USEDEP}]
+		dev-libs/libffi:=[${MULTILIB_USEDEP}]
+		cuda? ( dev-util/nvidia-cuda-toolkit:= )
+	)"
+# 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? ( virtual/pkgconfig )
+	test? (
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+		>=sys-devel/clang-6
+	)"
+
+LLVM_COMPONENTS=( openmp llvm/include )
+llvm.org_set_globals
+
+python_check_deps() {
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+kernel_pds_check() {
+	if use kernel_linux && kernel_is -lt 4 15 && kernel_is -ge 4 13; then
+		local CONFIG_CHECK="~!SCHED_PDS"
+		local ERROR_SCHED_PDS="\
+PDS scheduler versions >= 0.98c < 0.98i (e.g. used in kernels >= 4.13-pf11
+< 4.14-pf9) do not implement sched_yield() call which may result in horrible
+performance problems with libomp. If you are using one of the specified
+kernel versions, you may want to disable the PDS scheduler."
+
+		check_extra_config
+	fi
+}
+
+pkg_pretend() {
+	kernel_pds_check
+}
+
+pkg_setup() {
+	use test && python-any-r1_pkg_setup
+}
+
+multilib_src_configure() {
+	local libdir="$(get_libdir)"
+	local mycmakeargs=(
+		-DOPENMP_LIBDIR_SUFFIX="${libdir#lib}"
+
+		-DLIBOMP_USE_HWLOC=$(usex hwloc)
+		-DLIBOMP_OMPT_SUPPORT=$(usex ompt)
+
+		-DOPENMP_ENABLE_LIBOMPTARGET=$(usex offload)
+
+		# do not install libgomp.so & libiomp5.so aliases
+		-DLIBOMP_INSTALL_ALIASES=OFF
+		# disable unnecessary hack copying stuff back to srcdir
+		-DLIBOMP_COPY_EXPORTS=OFF
+	)
+	use offload && mycmakeargs+=(
+		# this is non-fatal and libomp checks for CUDA conditionally
+		# to ABI, so we can just ignore passing the wrong value
+		# on non-amd64 ABIs
+		-DCMAKE_DISABLE_FIND_PACKAGE_CUDA=$(usex !cuda)
+	)
+	use test && mycmakeargs+=(
+		# this project does not use standard LLVM cmake macros
+		-DOPENMP_LLVM_LIT_EXECUTABLE="${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/libsmbios/Manifest b/sys-libs/libsmbios/Manifest
index 1fdcdd1c8723..b07c0873b4d3 100644
--- a/sys-libs/libsmbios/Manifest
+++ b/sys-libs/libsmbios/Manifest
@@ -2,4 +2,4 @@ AUX libsmbios-2.2.28-cppunit-tests.patch 350 BLAKE2B c735096c5fe0e33eec728e28009
 AUX libsmbios-2.4.3-avoid_bashisms.patch 2909 BLAKE2B 426ca128f142307ea89cc5003c298518115805a518b348345f154094e34be932721aa6c880612fa7fe3473bc1156bf7c2dc1ce085dd9511ddeaf58e54d2464e1 SHA512 d2199481d87527ce7e90ca355cdfaf48a859982e67090e248034139b19ce2d61717e9887d246c7bd6b1e46f3f97cf6ec6bbdf04e3091c513221cb42d0f1431b3
 DIST libsmbios-2.4.3.tar.gz 644140 BLAKE2B 684bff4f6cf755796f785e9a93d4ddbe2a1af52082cdebc27d203772a6a2a0259edb4b9d19921f90fc78b48d54700223fbc2628665b963ebcb601010ff4340ab SHA512 7f6fb36fa9653e123b416b275953fb5652025e76dac3b4ec5600168e193ea56f8ac3ea1a3b5db29d2770e73d88152d712a35bf77a9b3fc5596570fae885585ad
 EBUILD libsmbios-2.4.3.ebuild 1788 BLAKE2B e4872329f12b1529e54d562aa55d18b8ec0a8d6e45bdd6104eba316f7e79057cb1a7a1e98791603f9a9c2bee26e0513762bf6e94a2a95904e8efcecd838082b9 SHA512 4c207f4bdd39d352d28d3312fd2e72dac8b4e4b434c3dd5bb96d93ecf12e1f377d8c96e4e4bfdd80a10bc9043df83bc30e23915cc936d75ff73da0d08e8109e7
-MISC metadata.xml 564 BLAKE2B 9692567feec851f92126289afe0b4117d9e397615dcbd265b73cf8883417739899b26bd9ee2fb6621c61e3c18262858fa78b7975edf4f87f7032356ccdd4c875 SHA512 68273bacd56e8af3314737d8bda5e09c8ce9c089e5d942b4a2afd86187f702d3d5fa9419db5042f660aaa8ab12d0eeb69cfa14c7fc26589e1b4a638dde83b92a
+MISC metadata.xml 682 BLAKE2B a40ca216545f32cafca19b9a7b10b496d4e05b9a36b99476e87b0149c4ac8b305d7ceed7069a242862517d5d0f5c5fec1a6563c9ad8d4e14bbee81bf079c8b58 SHA512 0270fc658002ff0bdd1b7edf7ba0d59c64ef9e03ac033a76bfe6aec498ccde74daec4b066bdab9598e49c2bc0c6d1d2fb054ed60556fd2ebf25b2240e998026d
diff --git a/sys-libs/libsmbios/metadata.xml b/sys-libs/libsmbios/metadata.xml
index 426debbdad90..842c57e6157a 100644
--- a/sys-libs/libsmbios/metadata.xml
+++ b/sys-libs/libsmbios/metadata.xml
@@ -5,6 +5,10 @@
     <email>polynomial-c@gentoo.org</email>
     <name>Lars Wendler</name>
   </maintainer>
+  <maintainer type="person">
+    <email>whissi@gentoo.org</email>
+    <name>Thomas Deutschmann</name>
+  </maintainer>
   <longdescription>The libsmbios project aims towards providing access to as much
 BIOS information as possible. It does this by providing a library of functions
 that can be used as well as sample binaries.</longdescription>
diff --git a/sys-libs/libxcrypt/Manifest b/sys-libs/libxcrypt/Manifest
index d96148e5b2a6..47a16f39b773 100644
--- a/sys-libs/libxcrypt/Manifest
+++ b/sys-libs/libxcrypt/Manifest
@@ -9,4 +9,4 @@ EBUILD libxcrypt-4.4.16.ebuild 4191 BLAKE2B 64921e9c8bb070e5810504344ebda777acd4
 EBUILD libxcrypt-4.4.17.ebuild 4261 BLAKE2B 621c91e359a6d2c4d3e152b9c2590e676bfb2d5dee5d50ee7247418e37710e1a486a47b690fc015830f1464ed2eb83facec5385f3435b03359a83e38cb1f347b SHA512 f148a47f62ef9aff0fd3fde65d00df2f5819e28b44ea60fed5d04d0aa5efe7dab5eb71b9d1735fb9ce6647af12705dc6cb6a3eae06eece12874e5ba7844bc228
 EBUILD libxcrypt-4.4.19.ebuild 4215 BLAKE2B 60b120aa9a9af60001c4180c2e7ba4bf9e0410b00a206aea3c4ce09e6c5af1c633b4a35e99d76a40435680e1be0a782dfed2c971a7d6d9d1b363d3f69a55e16a SHA512 0323090b8e5a909565000b7929174081a5a2fde35f08fc5b523a47c739375141c747b1d2d923f43fd80ef0913d02dc1d365eb23c8c082935560f87abfbc85acb
 EBUILD libxcrypt-4.4.20.ebuild 4215 BLAKE2B 60b120aa9a9af60001c4180c2e7ba4bf9e0410b00a206aea3c4ce09e6c5af1c633b4a35e99d76a40435680e1be0a782dfed2c971a7d6d9d1b363d3f69a55e16a SHA512 0323090b8e5a909565000b7929174081a5a2fde35f08fc5b523a47c739375141c747b1d2d923f43fd80ef0913d02dc1d365eb23c8c082935560f87abfbc85acb
-MISC metadata.xml 856 BLAKE2B e9fea1aa08f5b3f0abdd4d490973da2f133ea90e3a366d4549361233f51e674cc646b2fb6b4b15bca72d5a4e3b36be9a06e55afd3a4cb8f439d3958f09f8af25 SHA512 862cf3201efbecfc23167ecd1f6798f6729ba4e76749c174d17baf8aa4887f21d36f40234f35bc1b896e4384d110033b3f2260f01930b926f759e0243039adf8
+MISC metadata.xml 830 BLAKE2B 21022e8e6a34737874590a560010f2a8fd1fb11275b4f675d195b66af70ebf8f28a2d881bab0a6653b0b1fbc09c14b99339f43d6f07fd8ffe282f951c64a4f96 SHA512 03dafb661b2273d25c7e282bb91ba01a371734446e12d140d5c5c469172e62f768de6d2a0f5bcdcdae7275f4ba0ad46de69c546b381c1f0bf338cdb487267773
diff --git a/sys-libs/libxcrypt/metadata.xml b/sys-libs/libxcrypt/metadata.xml
index d84b73d6af1e..21bf25d8b116 100644
--- a/sys-libs/libxcrypt/metadata.xml
+++ b/sys-libs/libxcrypt/metadata.xml
@@ -1,20 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-  <maintainer type="project">
-    <email>hardened@gentoo.org</email>
-    <name>Gentoo Hardened</name>
-  </maintainer>
-  <longdescription>
-        Crypt library for DES, MD5, and blowfish. Libxcrypt is a replacement for
-        libcrypt, which comes with the GNU C Library. It supports DES crypt,
-        MD5, and passwords with blowfish encryption.
-  </longdescription>
-  <use>
-    <flag name="compat">Build with compatibility interfaces for other crypt implementations</flag>
-    <flag name="system">Install as system libcrypt.so rather than to an alternate directory (will collide with sys-libs/glibc's version)</flag>
-  </use>
-  <upstream>
-    <remote-id type="github">besser82/libxcrypt</remote-id>
-  </upstream>
+	<maintainer type="project">
+		<email>toolchain@gentoo.org</email>
+		<name>Gentoo Toolchain Project</name>
+	</maintainer>
+	<longdescription>
+		Crypt library for DES, MD5, and blowfish. Libxcrypt is a replacement for
+		libcrypt, which comes with the GNU C Library. It supports DES crypt,
+		MD5, and passwords with blowfish encryption.
+	</longdescription>
+	<use>
+		<flag name="compat">Build with compatibility interfaces for other crypt implementations</flag>
+		<flag name="system">Install as system libcrypt.so rather than to an alternate directory (will collide with sys-libs/glibc's version)</flag>
+	</use>
+	<upstream>
+		<remote-id type="github">besser82/libxcrypt</remote-id>
+	</upstream>
 </pkgmetadata>
diff --git a/sys-libs/llvm-libunwind/Manifest b/sys-libs/llvm-libunwind/Manifest
index 342c49026863..d5c1a06b9332 100644
--- a/sys-libs/llvm-libunwind/Manifest
+++ b/sys-libs/llvm-libunwind/Manifest
@@ -2,10 +2,12 @@ DIST llvmorg-10.0.1.tar.gz 120880730 BLAKE2B 30f19f56c4d1f6abcda5fec76256219d1e3
 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-rc1.tar.gz 134261735 BLAKE2B d29510495641c06e6d7a5ac165e6d34e0ba15d1a5b786534e186e341e3a0550cdd3d8a2b61deb3e2bf44c0b0ff8561224bf7f8cebc2ce9415639cb67ceae289e SHA512 4595a26df56eed7d5941240fe92116ad2f1c61639f0f464697c2c530a601347032fbad6802d1fa915ced8574c7b30ef05bc8c0be737784c844d3860892817e6e
+DIST llvmorg-12.0.1-rc2.tar.gz 134274147 BLAKE2B 2d3f6ce8d5239cf2e5ea52f4b9020d6a8fedb8d6a4df02ca0d8e4398237f4eb967865e1e65570d16cd191865281b9619a63905c1e1c47b31183b881e97e49867 SHA512 cdebb954016dc92251cd9c6281804f7a36e7bc8c6f101a6817d96cc121aba4d361fb99501c259409a29c90d7749b224be670c41177fe43fa64b730ff294831b8
 EBUILD llvm-libunwind-10.0.1.ebuild 3185 BLAKE2B 150bde0a85684ac2cbc01d20139e458f57377c2c9692037e7fec432019b16f073d6e14d772dfee190ab8a682e4b133f538dce51fce3ede54e8e20152575ac7c1 SHA512 4cdf4ce69be5ca630701d4e41bdcfead01eac10ced7edc39a9b20628e3225b65b33ac493d3010f8ac8cfe5cce73b70bb2d4988d1ea00f2766efdbe30c03aa6de
 EBUILD llvm-libunwind-11.1.0.ebuild 3223 BLAKE2B c39bdefd6bf0656db7d84f3cd868da01aa4b37f51c729951d1bcb73336f6ab1d8beb114a7d10d79c1441ce945b03aaf9444481e5e1b3e7dd7fdb9a7e971c451d SHA512 ad8cb081326e4dd6cd888882fabcc3fa1a152c37b28197c9565d46d8f8419f233a1a9f6cc9f3bcfe4ba1441cf97147dafb684e3eb60453020d2b64ccfb56d1c1
 EBUILD llvm-libunwind-12.0.0.ebuild 3239 BLAKE2B 04a0b9de0107e28b22fbbe4e94e55969cdd7040710e3d76d8f2c57ef820d556463cb8bda5b450221383f48b989cd923ce3ec3fd63a1514d8e6b95f4a91d797cb SHA512 6ff67dcd84b49c8092a18e27b4e9db3a745c1e77035d86134b8ff1150010f1f3e3b993d99d04c60529594df6e5b2260c0d1c01746dac333ef7e70fea9c1e257a
 EBUILD llvm-libunwind-12.0.1.9999.ebuild 3191 BLAKE2B c6d413951aed1e093b629506afdb3f76f5887239dc4aedd1d9f7063549d2cad5b286d253df25aacb20116ad6ac6f85453d357eb96de02611d18d5f136d62ebc4 SHA512 99693bac2c943e756f4c7b586d78add1811f91c0bf9bad235bb9a9feb4df1edb779d1e01759ff86a484e48a8bca2ebd6740d5a4c4cdf9dbddab6ebc6a0bd8591
 EBUILD llvm-libunwind-12.0.1_rc1.ebuild 3191 BLAKE2B c6d413951aed1e093b629506afdb3f76f5887239dc4aedd1d9f7063549d2cad5b286d253df25aacb20116ad6ac6f85453d357eb96de02611d18d5f136d62ebc4 SHA512 99693bac2c943e756f4c7b586d78add1811f91c0bf9bad235bb9a9feb4df1edb779d1e01759ff86a484e48a8bca2ebd6740d5a4c4cdf9dbddab6ebc6a0bd8591
+EBUILD llvm-libunwind-12.0.1_rc2.ebuild 3191 BLAKE2B c6d413951aed1e093b629506afdb3f76f5887239dc4aedd1d9f7063549d2cad5b286d253df25aacb20116ad6ac6f85453d357eb96de02611d18d5f136d62ebc4 SHA512 99693bac2c943e756f4c7b586d78add1811f91c0bf9bad235bb9a9feb4df1edb779d1e01759ff86a484e48a8bca2ebd6740d5a4c4cdf9dbddab6ebc6a0bd8591
 EBUILD llvm-libunwind-13.0.0.9999.ebuild 3191 BLAKE2B c6d413951aed1e093b629506afdb3f76f5887239dc4aedd1d9f7063549d2cad5b286d253df25aacb20116ad6ac6f85453d357eb96de02611d18d5f136d62ebc4 SHA512 99693bac2c943e756f4c7b586d78add1811f91c0bf9bad235bb9a9feb4df1edb779d1e01759ff86a484e48a8bca2ebd6740d5a4c4cdf9dbddab6ebc6a0bd8591
 MISC metadata.xml 302 BLAKE2B ef8858b3c26dfa1727e57685381dbf71eb74008e74127b06467aaff9eea2fd7f3fdcdb1819529b8e828d42720745855e948d608bbe3eb40778fe1e4e260118ad SHA512 d5e641d63402052ef7af157f98998868a816d5e5072424725b09ded5c2477b26aaafbb8874473367a860d3fc365e0f4f0db451315ec4be3df23cce4c1194f2d7
diff --git a/sys-libs/llvm-libunwind/llvm-libunwind-12.0.1_rc2.ebuild b/sys-libs/llvm-libunwind/llvm-libunwind-12.0.1_rc2.ebuild
new file mode 100644
index 000000000000..bf538b66689b
--- /dev/null
+++ b/sys-libs/llvm-libunwind/llvm-libunwind-12.0.1_rc2.ebuild
@@ -0,0 +1,124 @@
+# 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
+
+DESCRIPTION="C++ runtime stack unwinder from LLVM"
+HOMEPAGE="https://github.com/llvm-mirror/libunwind"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+KEYWORDS=""
+IUSE="debug static-libs test"
+RESTRICT="!test? ( test )"
+
+RDEPEND="!sys-libs/libunwind"
+# llvm-6 for new lit options
+DEPEND="
+	>=sys-devel/llvm-6"
+BDEPEND="
+	test? ( >=sys-devel/clang-3.9.0
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
+	)"
+
+LLVM_COMPONENTS=( libunwind libcxx llvm/cmake/modules )
+LLVM_TEST_COMPONENTS=( libcxxabi )
+llvm.org_set_globals
+
+python_check_deps() {
+	has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+pkg_setup() {
+	use test && python-any-r1_pkg_setup
+}
+
+multilib_src_configure() {
+	local libdir=$(get_libdir)
+
+	local mycmakeargs=(
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+		-DLIBUNWIND_ENABLE_ASSERTIONS=$(usex debug)
+		-DLIBUNWIND_ENABLE_STATIC=$(usex static-libs)
+		-DLLVM_INCLUDE_TESTS=$(usex test)
+
+		# support non-native unwinding; given it's small enough,
+		# enable it unconditionally
+		-DLIBUNWIND_ENABLE_CROSS_UNWINDING=ON
+	)
+	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}"
+			-DLIBUNWIND_LIBCXX_PATH="${WORKDIR}/libcxx"
+		)
+	fi
+
+	cmake_src_configure
+}
+
+build_libcxxabi() {
+	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/$(get_libdir)"
+	local CMAKE_USE_DIR=${WORKDIR}/libcxxabi
+	local BUILD_DIR=${BUILD_DIR}/libcxxabi
+	local mycmakeargs=(
+		-DLIBCXXABI_LIBDIR_SUFFIX=
+		-DLIBCXXABI_ENABLE_SHARED=OFF
+		-DLIBCXXABI_ENABLE_STATIC=ONF
+		-DLIBCXXABI_USE_LLVM_UNWINDER=ON
+		-DLIBCXXABI_INCLUDE_TESTS=OFF
+
+		-DLIBCXXABI_LIBCXX_INCLUDES="${WORKDIR}"/libcxx/include
+		-DLIBCXXABI_LIBUNWIND_INCLUDES="${S}"/include
+	)
+
+	cmake_src_configure
+	cmake_src_compile
+}
+
+build_libcxx() {
+	local -x LDFLAGS="${LDFLAGS} -L${BUILD_DIR}/libcxxabi/lib -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
+		-DLIBCXXABI_USE_LLVM_UNWINDER=ON
+		-DLIBCXX_CXX_ABI=libcxxabi
+		-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${WORKDIR}"/libcxxabi/include
+		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
+		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
+		-DLIBCXX_HAS_GCC_S_LIB=OFF
+		-DLIBCXX_INCLUDE_TESTS=OFF
+	)
+
+	cmake_src_configure
+	cmake_src_compile
+}
+
+multilib_src_test() {
+	# build local copies of libc++ & libc++abi for testing to avoid
+	# circular deps
+	build_libcxxabi
+	build_libcxx
+	mv "${BUILD_DIR}"/libcxx*/lib/libc++* "${BUILD_DIR}/$(get_libdir)/" || die
+
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check-unwind
+}
+
+multilib_src_install() {
+	cmake_src_install
+
+	# install headers like sys-libs/libunwind
+	doheader "${S}"/include/*.h
+}