[Bug fortran/57469] New: Erroneous warning for unused dummy arguments used in namelist

[vladimir.fuka at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57469

            Bug ID: 57469
           Summary: Erroneous warning for unused dummy arguments used in
                    namelist
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vladimir.fuka at gmail dot com

This code:

   subroutine read_command_line(line,a,b)
     character(*),intent(in) :: line
     intent(inout) :: a,b
     namelist /cmd/ a,b

     read(line,nml = cmd)
   end

produces this warning with gfortran-4.8 20130509:

gfortran warning.f90 -c -Wall
warning.f90:1.38:

   subroutine read_command_line(line,a,b)
                                      1
Warning: Unused dummy argument 'a' at (1)
warning.f90:1.40:

   subroutine read_command_line(line,a,b)
                                        1
Warning: Unused dummy argument 'b' at (1)




For intent(out) it produces:

Warning: Dummy argument 'a' at (1) was declared INTENT(OUT) but was not set

But i understand it may be correct.