Re: C23 thoughts and opinions

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.