[Bug fortran/31547] New: Document when CPP is called and document the f95-cpp-input option

["burnus at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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