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# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
PYTHON_COMPAT=( python3_{13..14} )
inherit cmake flag-o-matic llvm.org python-any-r1 toolchain-funcs
DESCRIPTION="LLVM's Fortran frontend"
HOMEPAGE="https://flang.llvm.org/"
LICENSE="Apache-2.0-with-LLVM-exceptions"
SLOT="${LLVM_MAJOR}/${LLVM_SOABI}"
KEYWORDS="~amd64 ~arm64"
IUSE="+clang debug test"
RESTRICT="!test? ( test )"
DEPEND="
~llvm-core/clang-${PV}[debug=]
~llvm-core/llvm-${PV}[debug=]
~llvm-core/mlir-${PV}[debug=]
"
RDEPEND="
${DEPEND}
"
PDEPEND="
>=llvm-runtimes/flang-rt-${PV}:${LLVM_MAJOR}
"
BDEPEND="
clang? ( llvm-core/clang )
test? (
$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
)
"
LLVM_COMPONENTS=( flang cmake )
LLVM_TEST_COMPONENTS=(
clang/test/Driver mlir/test/lib
# for building flang-rt
runtimes flang-rt libc/shared llvm/{cmake,utils}
# openmp
openmp third-party/unittest
)
LLVM_USE_TARGETS=llvm+eq
llvm.org_set_globals
python_check_deps() {
python_has_version "dev-python/lit[${PYTHON_USEDEP}]"
}
pkg_pretend() {
if ! use clang && tc-is-gcc; then
ewarn "Building using GCC requires lots of memory (up to 10 GiB per process)."
ewarn "Consider enabling USE=clang."
ewarn "See https://gcc.gnu.org/PR119705"
fi
}
pkg_setup() {
use test && python-any-r1_pkg_setup
}
src_prepare() {
# create extra parent dir for relative CLANG_RESOURCE_DIR access
mkdir -p x/y || die
BUILD_DIR=${WORKDIR}/x/y/build
llvm.org_src_prepare
}
src_configure() {
if use clang; then
# Only do this conditionally to allow overriding with
# e.g. CC=clang-13 in case of breakage
if ! tc-is-clang ; then
local -x CC=${CHOST}-clang
local -x CXX=${CHOST}-clang++
fi
strip-unsupported-flags
fi
local mycmakeargs=(
-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/lib/llvm/${LLVM_MAJOR}"
-DLLVM_ROOT="${ESYSROOT}/usr/lib/llvm/${LLVM_MAJOR}"
-DCLANG_RESOURCE_DIR="../../../clang/${LLVM_MAJOR}"
-DBUILD_SHARED_LIBS=OFF
-DMLIR_LINK_MLIR_DYLIB=ON
# flang does not feature a dylib, so do not install libraries
# or headers
-DLLVM_INSTALL_TOOLCHAIN_ONLY=ON
# installed by llvm-runtimes/flang-rt
-DFLANG_INCLUDE_RUNTIME=OFF
# TODO: always enable to obtain reproducible tools
-DFLANG_INCLUDE_TESTS=$(usex test)
-DLLVM_TARGETS_TO_BUILD="${LLVM_TARGETS// /;}"
)
use test && mycmakeargs+=(
-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
-DLLVM_LIT_ARGS="$(get_lit_flags)"
)
# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
cmake_src_configure
}
build_runtimes() {
local -x FC=${BUILD_DIR}/bin/flang
local -x F77=${FC}
local CMAKE_USE_DIR=${WORKDIR}/runtimes
local BUILD_DIR=${WORKDIR}/runtimes_build
strip-unsupported-flags
local mycmakeargs=(
# cmake.eclass does not set if it we don't inherit fortran-2
# and upstream code relies on it being set before Fortran logic
# kicks in and reds envvars
-DCMAKE_Fortran_COMPILER="${FC}"
# we may not have a runtime yet
-DCMAKE_Fortran_COMPILER_WORKS=TRUE
# tests rddequire modules now
-DRUNTIMES_FORTRAN_MODULES=ON
-DLLVM_ENABLE_RUNTIMES="flang-rt;openmp"
# this package forces NO_DEFAULT_PATHS
-DLLVM_BINARY_DIR="${ESYSROOT}/usr/lib/llvm/${LLVM_MAJOR}"
-DLLVM_DEFAULT_TARGET_TRIPLE="${CHOST}"
# install inside the test tree
-DRUNTIMES_INSTALL_RESOURCE_PATH="${WORKDIR}/lib/clang/${LLVM_MAJOR}"
# work hard not to install anything else
-DLLVM_INSTALL_TOOLCHAIN_ONLY=ON
-DOPENMP_INSTALL_LIBDIR="${T}/discard"
-DFLANG_RT_INCLUDE_TESTS=OFF
-DLIBOMP_FORTRAN_MODULES_ONLY=ON
-DLIBOMP_USE_HWLOC=OFF
-DLIBOMP_OMPD_GDB_SUPPORT=OFF
-DLIBOMP_OMPT_SUPPORT=OFF
)
# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
cmake_src_configure
cmake_build install
}
src_test() {
# respect TMPDIR!
local -x LIT_PRESERVES_TMP=1
local -x LIT_XFAIL="Driver/fakeflang.F"
build_runtimes
cmake_build check-flang
}
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