-F

Invoke the source file preprocessor, but do not compile.

SPARC: 77/90 x86:77

Apply the fpp preprocessor to .F files (and .F90 files with f90) and write the processed result on a file with the same name but with suffix changed to .f (or .f90), but do not compile.

Example:

f77 -F source.F

writes the processed source file to source.f

fpp is the default preprocessor for Fortran. The C preprocessor, cpp, can be selected instead by specifying -xpp=cpp.