I’m currently working with legacy Fortran code, and I’m interested in modernizing it to take advantage of the features and improvements introduced in Fortran 90 and later versions. The existing codebase is written in Fortran 77 and contains many outdated practices. My goal is to make the code more …

I would suggest you first change the build system to FPM , second add as many as necessary tests in FPM to be able to detect possible bugs during modernization of the code.

This work by @Arjen might be of help: [image] Fortran Monthly Call: May 2023 FYI, I have created a new Github project for my description of old FORTRAN 77 programming idioms - GitHub - arjenmarkus/old-programming-idioms: Explain old-style programming idioms used in FORTRA…

I think that the first step is to make a regression test. If you are going to make systematic changes you need to know that you haven’t broken anything :wink: fpt ( http://simconglobal.com ) will probably do a large part of what you want. It will change the code to free format, pretty-print it, an…

Modernizing Fortran Code: Transitioning to Fortran 90+

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alozada September 4, 2023, 11:55am 4

See: Tools for refactoring legacy codes

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Modernizing Fortran Code: Transitioning to Fortran 90+

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