Invoke the source file preprocessor, but do not compile.
Apply the fpp preprocessor to .F, .F90, .F95, and .F03 source files listed on the command line, and write the processed result on a file with the same name but with filename extension changed to .f (or .f95 or .f03), but do not compile.
Example:
f95 -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.