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.