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From: "stefan.mauerberger at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/57966] New: Using a TBP to specify the shape of a dummy argument
Date: Wed, 24 Jul 2013 10:40:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57966

            Bug ID: 57966
           Summary: Using a TBP to specify the shape of a dummy argument
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stefan.mauerberger at gmail dot com

Created attachment 30542
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30542&action=edit
minimal example

Hi There!

I am faced with some weired behavior. Because it is a little hard to describe I
am providing an example:

There is a DDT 'config_cls' whose pure TBP 'my_size' does nothing but returning
10 .
> TYPE config_cls
> CONTAINS
>     PROCEDURE, NOPASS :: my_size
> END TYPE

> PURE INTEGER FUNCTION my_size()
>     my_size = 10
> END FUNCTION my_size

In addition there is a subroutine 'my_sub' which expects a dummy argument of
explicit shape 'config%my_size()'. 
> SUBROUTINE my_sub( field )
>     REAL, INTENT(INOUT) :: field( config%my_size() )
>     !REAL, INTENT(INOUT), CONTIGUOUS :: field(:) ! Assumed shape works
>     !REAL, INTENT(INOUT) :: field( my_size() ) ! works, too

> END SUBROUTINE my_sub
As far as I can see this is valid Fortran code. However, gfortran complains
that config%my_size() is not a function. Well, this is wrong (for non dummy
arguments it works perfectly fine)!

Attached, there is a minimal example. Compiling it with gfortran terminates
with:
> test.f90:33.22:
>
>        REAL :: field( config%my_size() )
>                      1
> Error: 'my_size' at (1) should be a FUNCTION

Any ideas? 

Cheers, Stefan 

Actually, ifort 12.1.6, nag 5.3.2 and pgfortran 13.4 are just fine.