[Bug fortran/98701] I compiled a program with gfortran on Mac (Big Sur, version 11.1) and g77 on Windows 10. I get two very different results for identical input files with the results from the one compiled by gfortran being wrong.

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98701

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And given the warnings, if the code uses exact floating point comparisons, it
might behave differently if there is even 1 ulp difference (which is quite
possible on a lot of code).