Preprocess files with gcc/gfortran vs. cpp

[Jonathan Wakely]

On 19 February 2016 at 19:01, Nick Papior wrote:
> Am I missing some point here?
> I would have expected gcc/gfortran to use the _same_ preprocessing
> utility as that provided in cpp?

By default cpp works in C mode, but when invoked by the Fortran
front-end it runs in a different mode. If you use cpp -x f97-cpp-input
then it works in F95 mode, and you get results consistent with
invoking gcc on a .f file, or invoking gfortran.

I don't know why cpp treats C and Fortran input differently, but
that's why you don't see what you expect.