Currently, nowhere is documented that gfortran calls for .F, .FPP, .F90, .F95 and .F2003 the C Preprocessor (in the traditional mode, cf. PR 18428).
I don't know whether it fits better to gfortran.texi or invoke.texi. In addition, we don't document the option to call the preprocessor for files without capital letter (this is especially needed on operating systems where the file extension is case insensitive): -x f95-cpp-input -x f77-cpp-input and how to suppress the calling of the preprocessor, i.e. -x f77 -x f95 "f95" and "f95-cpp-input" are documented (or rather mentioned) in gcc(1). However, one should also add f77 and f77-cpp-input to the gcc manpage. (Cross ref: a "-cpp" option is proposed for gfortran in PR 18428) -- Summary: Document when CPP is called and document the f95-cpp- input option Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: documentation Severity: normal Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: burnus at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31547