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What's the degree of backward compatibility with FORTRAN releases? I imagine most FORTRAN codebases as being huge and old, so it makes me wonder how many can ad

• philshem 8y ago
  You can start with an awesome-fortran list: https://github.com/rabbiabram/awesome-fortran https://github.com/rabbiabram/awesome-fortran
• jhrmnn 8y ago
  Each new standard usually removes a very small number of features, but Fortran 2018 is mostly a superset of Fortran 77. Most compilers retain absolute backward compatibility, so they can compile a superset of Fortran 66 to 2018, and often some custom language extensions on top.
  • walshemj 8y ago
    Only some of the real ancient pre FORTRAN IV stuff has been removed.
• apaprocki 8y ago
  This will be of help as well: https://github.com/CodethinkLabs/fortrantools/blob/master/README.md https://github.com/CodethinkLabs/fortrantools/blob/master/RE... Most of the patches are upstreamed, but their gcc repo contains the patched versions on top of the latest gcc releases.
• wycy 8y ago
  In my experience nearly all standard old code will still compile just fine, except code which relied on compiler-specific extensions and directives. Unfortunately, there does tend to be a lot of code out there using these proprietary directives. Things like metacommands [0] will need to be converted to something standard (or removed) to work with modern compilers. [0] http://www.ousob.com/ng/fortran/ng4e22.php http://www.ousob.com/ng/fortran/ng4e22.php
• pletnes 8y ago
  I’ve compiled fortran code from approx 1965. Works the same today. I don’t know of anything that is as compatible as standard Fortran code. That being said, quite a few vendor extensions are floating around, and often old codebases rely on a few of these.