Since 2015, Nvidia has supported Flang: a Fortran compiler frontend to LLVM.
Flang is supported by
Cmake ≥ 3.10,
although CMake ≥ 3.14 is recommended in general to support more Fortran 2008 features.
Meson ≥ 0.50 supports Flang as well.
Flang is increasing
support for Fortran 2008, including
Flang f18 is a new LLVM Fortran compiler front-end based in C++17 instead of the monolithic C code inherited from PGI that become the first-generation Flang.
Flang is invoked in CMake ≥ 3.10 by
FC=flang CC=clang CXX=clang++ cmake ..
How to install Flang
Pick ONE of the following:
- Download the latest Flang Linux binary release
- Compile from source (not recommended for casual Flang users)
Download Flang binary
Flang prerelease binaries are provided for Linux. OSX, Windows, BSD support is in work.
Download Flang binary and extract to
export PATH=$PATH:$HOME/.local/flang/bin export LD_LIBRARY_PATH=$HOME/.local/flang/lib/:$LD_LIBRARY_PATH
Open a new Terminal and check
For casual use, consider starting instead by downloading the Flang binary as above.
Building the LLVM Flang Fortran compiler from source is a resource-intensive process.
- You need a moderately powerful PC to compile Flang with > 100 GB of free space on the drive you build Flang on. Flang install is small, but Flang build process requires a lot of drive space.
- Don’t use too much RAM with the
makefor building Flang. It maxed out RAM on a PC with 32 GB of RAM with
make -j. Try just plain
- follow the Flang build instructions sequentially. Don’t try to build later parts while earlier parts are still building, this will not work properly.