On Sun, 1 Jan 2023, 11:43 Hans Lonsdale via Gcc-help, <gcc-help@gcc.gnu.org>
wrote:

> Am trying to compile a free-format fortran file with some subroutines in
> it, with gfortran complaining
> about the file.  What is going on?
>
> gfortran -O3 -ffree-form -o kamkrai-sort.f
> gfortran: fatal error: no input files; unwilling to write output files
> compilation terminated.
>



The -o option names the output file, but you have told the compiler to use
your input file as the output file.