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pkgname=('flang-classic')
pkgver=20221103
_llvmver=15.0.3
pkgrel=1
pkgdesc="out-of-tree Fortran compiler targeting LLVM"
arch=('x86_64')
url="https://github.com/flang-compiler/flang"
license=('custom:Apache 2.0 with LLVM Exception')
depends=('libxml2' 'libffi' 'libedit')
makedepends=('cmake' 'python')
options=('staticlibs' '!lto')
source=("https://github.com/flang-compiler/classic-flang-llvm-project/archive/refs/tags/flang-${_llvmver}-${pkgver}.tar.gz"
"https://github.com/flang-compiler/flang/archive/refs/tags/flang_${pkgver}.tar.gz")
sha256sums=('20fd35b3408c38a6dd1d60335f30c86d362cf72f2bc53e45d45ae44122662032'
'8971e5a48fa47e2193f6b77ff2425430b14f04f4f586ba262aadd43e80ccd0f2')
prepare () {
# include string.h for getenv & atoi
curl -L https://github.com/llvm/llvm-project/commit/1b4fdf18.patch | patch -p1 -d classic-flang-llvm-project-flang-${_llvmver}-${pkgver}
# install flang2 in /bin
curl -L https://github.com/flang-compiler/flang/commit/1e75c4c5.patch | patch -p1 -d flang-flang_${pkgver}
}
build() {
# unset LIBOMP_USE_VERSION_SYMBOLS because of: /usr/bin/ld: ../../../../lib/libomp.so: version node not found for symbol omp_capture_affinity_@OMP_5.0
cmake -S classic-flang-llvm-project-flang-${_llvmver}-${pkgver}/llvm -B build_llvm -DCMAKE_INSTALL_PREFIX=/usr/lib/llvmcf -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_CLASSIC_FLANG=ON -DLLVM_ENABLE_PROJECTS="clang;openmp" -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_INCLUDE_BENCHMARKS=OFF -DLIBOMP_USE_VERSION_SYMBOLS=OFF -DLLVM_HOST_TRIPLE=$CHOST
make -C build_llvm
# for llvm-config
export PATH=$PWD/build_llvm/bin/:$PATH
cmake -S flang-flang_${pkgver}/runtime/libpgmath -B build_pgmath -DCMAKE_INSTALL_PREFIX=/usr/lib/llvmcf -DCMAKE_BUILD_TYPE=Release
make -C build_pgmath
# https://github.com/flang-compiler/flang/issues/1204
export CXXFLAGS="${CXXFLAGS} -Wno-error=format-security"
cmake -S flang-flang_${pkgver} -B build -DCMAKE_INSTALL_PREFIX=/usr/lib/llvmcf -DCMAKE_BUILD_TYPE=Release -DWITH_WERROR=OFF -DCMAKE_Fortran_COMPILER=$PWD/build_llvm/bin/flang -DCMAKE_Fortran_COMPILER_ID=Flang -DLLVM_TARGETS_TO_BUILD=X86 -DLIBPGMATH=$PWD/build_pgmath/lib/libpgmath.so -DFLANG_LIBOMP=$PWD/build_llvm/lib/libomp.so -DCMAKE_INSTALL_RPATH=/usr/lib/llvmcf/lib
make -C build
}
package() {
make DESTDIR="${pkgdir}" install -C build_llvm
make DESTDIR="${pkgdir}" install -C build_pgmath
make DESTDIR="${pkgdir}" install -C build
# Create symlinks from /usr/bin/ to /usr/lib/llvmcf/bin/
install -d "$pkgdir"/usr/{bin,include}
ln -s ../lib/llvmcf/bin/flang "$pkgdir/usr/bin/flang"
for fmod in iso_fortran_env iso_c_binding ieee_arithmetic ieee_exceptions ieee_features omp_lib omp_lib_kinds
do
ln -s ../lib/llvmcf/include/${fmod}.mod "$pkgdir/usr/include/${fmod}.mod"
done
}
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