llvm-runtimes/libcxxabi: Add 21.0.0_pre20250607 snapshot

Signed-off-by: Michał Górny <mgorny@gentoo.org>

llvm-runtimes/libcxxabi/Manifest

@@ -10,4 +10,5 @@ DIST llvm-project-19.1.7.src.tar.xz 141249332 BLAKE2B 1259ed7f9aca7b35e89d818bef
 DIST llvm-project-19.1.7.src.tar.xz.sig 438 BLAKE2B 4015140f4ba77de45039bdbdfbaf6f30e75705123d067ea97175d91d7a5b6a75008df01d99ae7aa16aaa3b101f3f41e38d01f04158f95a261d617b3ede0254cd SHA512 195797b06ac80a742e0ccbc03a50dc06dd2e04377d783d5474e3e72c5a75203b60292b047929312a411d22b137a239943fba414a4d136a2be14cbff978eb6bda
 DIST llvm-project-20.1.6.src.tar.xz 147239668 BLAKE2B ccd86730fdea3dd40ebf054661b854b9332204389db2205e1e7b2a7f140fc187cacb34de68aa9a63c15c1e17b1d0976c080cfdee7e2cb6b0dd5570001d84be12 SHA512 aae652fdc61bda3f80b1340a3270b687355bfb6817f4bc05dac2268a2f8c5fc677eadb515cda7c8518005f1dc39e7ce5d1c34bbc5a25f106ef8e6c8f1ecfdf6d
 DIST llvm-project-20.1.6.src.tar.xz.sig 566 BLAKE2B b7c48cfc1f6c9f513dadb8837b150e22043c215bf4958a8036c4077aeebdcf7c18223b0ce0ffbcacb2c7ddfeb06611b1022528ee04d3efda1ee1aa58367a9203 SHA512 0884048ff164a1f5caed0f1aabec173630a08ece98cf793d21b77fc969501e4f03daec39ae0fb124ad34a3436ceae66452e36a42c309f19790b7a87652482691
+DIST llvm-project-23d0c7348aacdfcb145a69e533a14131bae830cc.tar.gz 237123683 BLAKE2B 6713c82809a9793510615f54c3ad9b8b1d2449939b0c48ab10acd1a0db43b712b229356173c90b514bc91c08e9b2be7f8e54f797661b9743ae8c3aaa9acee15f SHA512 de94ab38f1d46124638d6e0650142a1612db27871ffa339c56224aba94a77f8ae6eb8c68ad0a5ed3fe000d7bff309d324cdb66a095be3c8211abfe600659bf1a
 DIST llvm-project-f8ca9e59cb438bd35b29a6d7cf6d72f50673aec9.tar.gz 236069626 BLAKE2B 5547770a22e5fd0240c0e435d0b0af0ebd789aa72d6829250917f2df605f9a95c6756bc1afc9b611b176c1ba8394c757b94789511b98b38c6ade6cca4c9ce7f6 SHA512 b1fffd7d4f5ede9bcda759bc59cdd47373a44a3bbd31a50d1d213e438a59f1da3cc96780a1d17ecaeb14454822921476406a6c37493354169f72e1fab7b3a3be

llvm-runtimes/libcxxabi/libcxxabi-21.0.0_pre20250607.ebuild

@@ -0,0 +1,111 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{11..14} )
+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+="
+	!<llvm-runtimes/libcxx-15
+"
+DEPEND="
+	${RDEPEND}
+	llvm-core/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	clang? (
+		llvm-core/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=(
+	libc llvm/include/llvm/{Demangle,Testing} 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="${EPREFIX}"/usr/include
+		# this is broken with standalone builds, and also meaningless
+		-DLIBCXXABI_USE_LLVM_UNWINDER=OFF
+
+		-DLIBCXX_ENABLE_SHARED=ON
+		-DLIBCXX_ENABLE_STATIC=OFF
+		-DLIBCXX_CXX_ABI=libcxxabi
+		-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
+		-DLIBCXX_HAS_MUSL_LIBC=$(llvm_cmake_use_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
+}