[Bug fortran/61615] Failure to resolve correct generic with TYPE(C_PTR) arguments

["dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61615

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2014-07-12
     Ever confirmed|0                           |1

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
If I use Fortran pointers as below, I get the "expected" output

MODULE foo
  USE iso_c_binding
  IMPLICIT NONE
  INTERFACE bar
    MODULE PROCEDURE bar_s
    MODULE PROCEDURE bar_a1d
  END INTERFACE bar
CONTAINS
  SUBROUTINE bar_s(a, b)
    real, pointer :: a, b
    WRITE (0, *) 'in bar_s'
  END SUBROUTINE bar_s

  SUBROUTINE bar_a1d(a, b)
    real, pointer :: a(:), b(:)
    WRITE (0, *) 'in bar_a1d'
  END SUBROUTINE bar_a1d
END MODULE foo

PROGRAM cptr_array_vs_scalar_arg
  USE foo
  USE iso_c_binding
  IMPLICIT NONE
  INTEGER, TARGET :: i
  real, pointer :: a, b
  real, pointer :: c(:), d(:)
  CALL bar(a, b)
  CALL bar(c, d)
END PROGRAM cptr_array_vs_scalar_arg

I don't understand how the code in comment 0 can distinguish bar_s from bar_a1d
based on the variable locations in memory, nor why it chooses bar_a1d.