[Bug fortran/52789] gfortran sets -Wunused-parameter in the C sense as well as the Fortran sense

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52789

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-04-02
                 CC|                            |burnus at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #5 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-04-02 09:38:34 UTC ---
Confirmed.

 * * *

We have for GCC in general:

  Language Independent Options
  Warning Options
   -Wunused-parameter
      Warn whenever a function parameter is unused aside from its declaration.
  (It is automatically enabled with -Wunused or -Wall.)

And gfortran specific:
  -Wunused-dummy-argument
     Warn about unused dummy arguments. This option is implied by -Wall.
  -Wunused-parameter
     Contrary to gcc's meaning of -Wunused-parameter, gfortran's implementation
     of this option does not warn about unused dummy arguments (see
     -Wunused-dummy-argument), but about unused "PARAMETER" values.
     -Wunused-parameter is not included in -Wall but is implied by -Wall
     -Wextra.

 * * *

TODO:

* "-Wunused" does not imply any of the Fortran -Wunused-* warnings.
  But it should! Interestingly, is does not even seem to enable the middle end
  warnings.

* If only -Wunused-parameter is used - but no flag which implies
  -Wunused-dummy-argument, the parameter has to be eliminated for the
  middle-end handling. Thus, we need a gfc_option.* for it - and ensure
  that warn_unused_parameter has the proper value (e.g. 0 if only
  -Wunused-parameter is used.)