[Bug fortran/64273] New: Add support for "#pragma warning" etc.

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64273

            Bug ID: 64273
           Summary: Add support for "#pragma warning" etc.
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
        Depends on: 28662, 53934, 62226

Follow up to PR44054 and PR53552. See also related bugs PR28662, PR62226,
PR53934.

There are two possibilities, either to use a real
  #pragma warning
or to make it more Fortran-like and use
  !GCC$ warning directive

See PR44054 and PR53552.