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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.lang.c
Subject: Re: C23 thoughts and opinions
Date: Tue, 28 May 2024 10:46:32 +0300
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On Tue, 28 May 2024 05:41:12 -0000 (UTC)
Lawrence D'Oliveiro <ldo@nz.invalid> wrote:

> On Sun, 26 May 2024 19:50:40 +0300, Michael S wrote:
> 
> > If I am not mistaken, gfortran by default treats extension .f
> > as "old FORTRAN" and extension .f90 as "new Fortran".  
> 
> The full list of recognized file extensions and their treatment is
> here
> <https://gcc.gnu.org/onlinedocs/gcc-14.1.0/gfortran/GNU-Fortran-and-GCC.html>.

Thank you.
So I remembered correctly, but did not realize that both old and new
variants (a.k.a fixed form and free form) are processed by the same
front end, f951. The driver programs (gcc, g++, gfortran) passes
dialect information to f951 as command line parameter. Fixed form is
chosen by -ffixed-form, free form appears to be the default.