[Bug fortran/34536] New: Make support of 2.0**-3*5 tighter: Print warning by default

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

The problem with
  2.0**-3*5
is whether it should be interpreted as "2.0**(-3) * 5" or as "2.0**(-3*5)".
gfortran does the former, ifort the latter.

g95, openf95, sunf95 and (of cause) NAG f95 reject it always.
ifort: Accepts it, unless -stand f* is used.
gfortran: Warning for -pedantic, Error for -std=f*. Nothing for -Wall.

I would suggest to print at least a warning by default; or to shift it to
legacy, but having it without diagnostics by default can lead to wrong results.


-- 
           Summary: Make support of 2.0**-3*5 tighter: Print warning by
                    default
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          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=34536