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Fortran compiler

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LFortran is a modern open-source (BSD licensed) interactive Fortran compiler built on top of LLVM. It can execute user's code interactively to allow exploratory work (much like Python, MATLAB or Julia) as well as compile to binaries with the goal to run user's code on modern architectures such as multi-core CPUs and GPUs.



All documentation, installation instructions, motivation, design, ... is available at:

Which is generated using the files in the doc directory.


The main development repository is at GitLab:

Please use it to open issues or send merge requests.

Main mailinglist:

You can also chat with us on Zulip (project chat).

CI status on master:


macOS: Build Status

Windows: Build status

We maintain an official GitHub read-only mirror (please do not send pull requests there, use our GitLab repository instead).

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