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# 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="C++ runtime stack unwinder from LLVM"
HOMEPAGE="https://llvm.org/docs/ExceptionHandling.html"
LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
SLOT="0"
KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86 ~arm64-macos ~x64-macos"
IUSE="+clang debug static-libs test"
REQUIRED_USE="test? ( clang )"
RESTRICT="!test? ( test )"
RDEPEND="
!sys-libs/libunwind
"
DEPEND="
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}
)
!test? (
${PYTHON_DEPS}
)
test? (
$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
)
"
LLVM_COMPONENTS=( runtimes libunwind libcxx llvm/cmake cmake )
LLVM_TEST_COMPONENTS=( libc libcxxabi llvm/utils/llvm-lit )
llvm.org_set_globals
python_check_deps() {
use test || return 0
python_has_version "dev-python/lit[${PYTHON_USEDEP}]"
}
test_compiler() {
target_is_not_host && return
local compiler=${1}
shift
${compiler} ${CFLAGS} ${LDFLAGS} "${@}" -o /dev/null -x c - \
<<<'int main() { return 0; }' &>/dev/null
}
multilib_src_configure() {
if use clang; then
llvm_prepend_path -b "${LLVM_MAJOR}"
fi
local libdir=$(get_libdir)
# https://github.com/llvm/llvm-project/issues/56825
# also separately bug #863917
filter-lto
# Workaround for bgo #961153.
# TODO: Fix the multilib.eclass, so it sets CTARGET properly.
if ! is_crosspkg; then
export CTARGET=${CHOST}
fi
if use clang; then
local -x CC=${CTARGET}-clang-${LLVM_MAJOR}
local -x CXX=${CTARGET}-clang++-${LLVM_MAJOR}
strip-unsupported-flags
# The full clang configuration might not be ready yet. Use the partial
# configuration files that are guaranteed to exist even during initial
# installations and upgrades.
local flags=(
--config="${ESYSROOT}"/etc/clang/"${LLVM_MAJOR}"/gentoo-{rtlib,linker}.cfg
)
local -x CFLAGS="${CFLAGS} ${flags[@]}"
local -x CXXFLAGS="${CXXFLAGS} ${flags[@]}"
local -x LDFLAGS="${LDFLAGS} ${flags[@]}"
fi
# Check whether C compiler runtime is available.
if ! test_compiler "$(tc-getCC)"; then
local nolib_flags=( -nodefaultlibs -lc )
if test_compiler "$(tc-getCC)" "${nolib_flags[@]}"; then
local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
ewarn "${CC} seems to lack runtime, trying with ${nolib_flags[*]}"
elif test_compiler "$(tc-getCC)" "${nolib_flags[@]}" -nostartfiles; then
# Avoiding -nostartfiles earlier on for bug #862540,
# and set available entry symbol for bug #862798.
nolib_flags+=( -nostartfiles -e main )
local -x LDFLAGS="${LDFLAGS} ${nolib_flags[*]}"
ewarn "${CC} seems to lack runtime, trying with ${nolib_flags[*]}"
fi
fi
# Check whether C++ standard library is available,
local nostdlib_flags=( -nostdlib++ )
if ! test_compiler "$(tc-getCXX)" &&
test_compiler "$(tc-getCXX)" "${nostdlib_flags[@]}"
then
local -x LDFLAGS="${LDFLAGS} ${nostdlib_flags[*]}"
ewarn "${CXX} seems to lack runtime, trying with ${nostdlib_flags[*]}"
fi
# link to compiler-rt
# https://github.com/gentoo/gentoo/pull/21516
local use_compiler_rt=OFF
[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
# Respect upstream build type assumptions (bug #910436) where they do:
# -DLIBUNWIND_ENABLE_ASSERTIONS=ON =>
# -DCMAKE_BUILD_TYPE=DEBUG => -UNDEBUG
# -DCMAKE_BUILD_TYPE!=debug => -DNDEBUG
# -DLIBUNWIND_ENABLE_ASSERTIONS=OFF =>
# -UNDEBUG
# See also https://github.com/llvm/llvm-project/issues/86#issuecomment-1649668826.
use debug || append-cppflags -DNDEBUG
local mycmakeargs=(
-DLLVM_ROOT="${ESYSROOT}/usr/lib/llvm/${LLVM_MAJOR}"
-DCMAKE_C_COMPILER_TARGET="${CTARGET}"
-DCMAKE_CXX_COMPILER_TARGET="${CTARGET}"
-DPython3_EXECUTABLE="${PYTHON}"
-DLLVM_ENABLE_RUNTIMES="libunwind"
-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
-DLLVM_INCLUDE_TESTS=OFF
-DLIBUNWIND_ENABLE_ASSERTIONS=$(usex debug)
-DLIBUNWIND_ENABLE_STATIC=$(usex static-libs)
-DLIBUNWIND_INCLUDE_TESTS=$(usex test)
-DLIBUNWIND_INSTALL_HEADERS=ON
# cross-unwinding increases unwinding footprint (to account
# for the worst case) and causes some breakage on AArch64
# https://github.com/llvm/llvm-project/issues/152549
-DLIBUNWIND_ENABLE_CROSS_UNWINDING=OFF
# avoid dependency on libgcc_s if compiler-rt is used
-DLIBUNWIND_USE_COMPILER_RT=${use_compiler_rt}
)
if is_crosspkg; then
mycmakeargs+=(
# Without this, the compiler will compile a test program
# and fail due to no builtins.
-DCMAKE_C_COMPILER_WORKS=1
-DCMAKE_CXX_COMPILER_WORKS=1
# Install inside the cross sysroot.
-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/${CTARGET}/usr"
)
fi
if use test; then
mycmakeargs+=(
-DLLVM_ENABLE_RUNTIMES="libunwind;libcxxabi;libcxx"
-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-DLLVM_LIT_ARGS="$(get_lit_flags)"
-DLIBUNWIND_LIBCXX_PATH="${WORKDIR}/libcxx"
-DLIBCXXABI_LIBDIR_SUFFIX=
-DLIBCXXABI_ENABLE_SHARED=OFF
-DLIBCXXABI_ENABLE_STATIC=ON
-DLIBCXXABI_USE_LLVM_UNWINDER=ON
-DLIBCXXABI_INCLUDE_TESTS=OFF
-DLIBCXX_LIBDIR_SUFFIX=
-DLIBCXX_ENABLE_SHARED=OFF
-DLIBCXX_ENABLE_STATIC=ON
-DLIBCXX_CXX_ABI=libcxxabi
-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=OFF
-DLIBCXX_HAS_MUSL_LIBC=$(llvm_cmake_use_musl)
-DLIBCXX_HAS_GCC_S_LIB=OFF
-DLIBCXX_INCLUDE_TESTS=OFF
-DLIBCXX_INCLUDE_BENCHMARKS=OFF
)
fi
cmake_src_configure
}
multilib_src_test() {
local -x LIT_PRESERVES_TMP=1
cmake_build check-unwind
}
multilib_src_install() {
DESTDIR=${D} cmake_build install-unwind
}
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