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fortran-ios

A script that acts like a Fortran compiler that uses Flang to build sources for iOS arm64.

Installation

Install Docker and open it to run the daemon. gfortran in /usr/local/bin is also recommended because if -arch arm64 is not passed to the script, it will use gfortran.

Make sure that '/Users' and '/var/folders' are present in Docker Desktop > Preferences > Resources > File Sharing.

Python 3 is also required.

You can build the project by running ./build.sh but it will take some time, so you can just download the release.

Usage

$ "<path/to/fortran-ios/bin/gfortran>" -arch arm64 -c test.f -o test.o
$ file test.o
test.o: Mach-O 64-bit object arm64

Then, link share/ios_flang_runtime.framework to your app that uses objects compiled with this project.

How it works

The flang compiler doesn't seem to officially support macOS, at least the version that can generate LLVM IR. So this project uses a Docker container with flang in it and compiles the given source into LLVM IR. Then, outside the container, llc compiles the LLVM IR into an object file.

The ios_flang_runtime framework contains the symbols needed at runtime by the Fortran object files to work. So an app containing Fortran code must link this framework. llc needs to be compiled from here to understand IR produced by flang.

The script is called gfortran so you can add the project to $PATH to build projects.

What worked with this

  • SciPy
  • Lapack