llvm-runtimes/libcxxabi: Add 22.0.0_pre20251120 snapshot

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

llvm-runtimes/libcxxabi/Manifest

@@ -15,3 +15,4 @@ DIST llvm-project-21.1.5.src.tar.xz 158957032 BLAKE2B c056049214b18a17a3fd2dc86a
 DIST llvm-project-21.1.5.src.tar.xz.sig 119 BLAKE2B abf014908e981ea358ee38f6d1ef6c745ebbe51011fa7e83a514672bbad152fac92c95dd32a7b52a8d9c2a2a9ea1b44e447bb0bc5953f0f7bbd9ced34aa3c0cc SHA512 4e327c7d60525526ff3ac6ca58f1e753a57f841b88078a9bfe2a2ce91e4a5e17bcc52fd2f27f75801540610c1a56d57a3070243f13ad583e3526901b1f7be4a5
 DIST llvm-project-21.1.6.src.tar.xz 158947864 BLAKE2B eeda7b9903ef59319ad22e5e3a8b66a339cbbb7445ccb75fa09db6823371a22e9b66cb44c084fdeb16054f2e62a149f6e069d9726f269f667dbd6a631cb658c3 SHA512 f9e6c84828e40cb0a7894258b07240468a9d555c11496a1725bf959444362277a90ea822eeb8c9b51b3b7fecd4dd0b213a28a2f2effefbf43efdd21084d10afc
 DIST llvm-project-21.1.6.src.tar.xz.sig 119 BLAKE2B 2e3de87f4adb181740cfc8a5f8de3e6f4090f50d2f0dfa2670b27c0a6dde296b399ee017b5f6220aa80581a16c81afb5c96454d69dac8ce246713570470956b8 SHA512 637cc9f778f8303e80985469c3102573a9cf6264093b1a83fb494e34b5cb444f76cbb7d6d497d44b05250d56e25ec27dd9df685e0b78b23bb71e4bcd05a8facf
+DIST llvm-project-21c4c1502e3383988ba77eac75b13da7b9426957.tar.gz 254650569 BLAKE2B aaa8fffbe3b8ddcffa232c6cd078d33efc0f23453fd79b2ae71a0760b35da2ad17ffaed95d99c2548904468767d9f95af2ca4a59245e1ddf51a6612bda61cda4 SHA512 40a97c53cf7825b5c1e6867df74fa22e3b786a2ec9bcb478e1af0e6a165c582316c3c75b12f4704227b8e95cce91ab110acb10f2d8f30bc82319d6af4d201956

llvm-runtimes/libcxxabi/libcxxabi-22.0.0_pre20251120.ebuild

@@ -0,0 +1,148 @@
+# 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 crossdev flag-o-matic llvm.org llvm-utils
+inherit python-any-r1 toolchain-funcs
+
+DESCRIPTION="Low level support for a standard C++ library"
+HOMEPAGE="https://libcxxabi.llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
+SLOT="0"
+IUSE="+clang +static-libs test"
+REQUIRED_USE="test? ( clang )"
+RESTRICT="!test? ( test )"
+
+DEPEND="
+	${RDEPEND}
+	llvm-core/llvm:${LLVM_MAJOR}
+"
+BDEPEND="
+	clang? (
+		llvm-core/clang:${LLVM_MAJOR}
+		llvm-core/clang-linker-config:${LLVM_MAJOR}
+		llvm-runtimes/clang-rtlib-config:${LLVM_MAJOR}
+		llvm-runtimes/clang-unwindlib-config:${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}]"
+}
+
+test_compiler() {
+	target_is_not_host && return
+	$(tc-getCXX) ${CXXFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c - \
+		<<<'int main() { return 0; }' &>/dev/null
+}
+
+multilib_src_configure() {
+	# Workaround for bgo #961153.
+	# TODO: Fix the multilib.eclass, so it sets CTARGET properly.
+	if ! is_crosspkg; then
+		export CTARGET=${CHOST}
+	fi
+
+	if use clang; then
+		llvm_prepend_path -b "${LLVM_MAJOR}"
+		local -x CC=${CTARGET}-clang-${LLVM_MAJOR}
+		local -x CXX=${CTARGET}-clang++-${LLVM_MAJOR}
+		strip-unsupported-flags
+
+		# The full clang configuration might not be ready yet. Use the partial
+		# configuration of components that libunwind depends on.
+		local flags=(
+			--config="${ESYSROOT}"/etc/clang/"${LLVM_MAJOR}"/gentoo-{rtlib,unwindlib,linker}.cfg
+		)
+		local -x CFLAGS="${CFLAGS} ${flags[@]}"
+		local -x CXXFLAGS="${CXXFLAGS} ${flags[@]}"
+		local -x LDFLAGS="${LDFLAGS} ${flags[@]}"
+	fi
+
+	local nostdlib_flags=( -nostdlib++ )
+	if ! test_compiler && test_compiler "${nostdlib_flags[@]}"; then
+		local -x LDFLAGS="${LDFLAGS} ${nostdlib_flags[*]}"
+		ewarn "${CXX} seems to lack stdlib, trying with ${nostdlib_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=(
+		-DLLVM_ROOT="${ESYSROOT}/usr/lib/llvm/${LLVM_MAJOR}"
+
+		-DCMAKE_CXX_COMPILER_TARGET="${CTARGET}"
+		-DPython3_EXECUTABLE="${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 is_crosspkg; then
+		mycmakeargs+=(
+			# Without this, the compiler will compile a test program
+			# and fail due to no builtins.
+			-DCMAKE_C_COMPILER_WORKS=1
+			-DCMAKE_CXX_COMPILER_WORKS=1
+			# Install inside the cross sysroot.
+			-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/${CTARGET}/usr"
+		)
+	fi
+	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
+}