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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/51610] New: [OOP] Class container does not properly handle POINTER and TARGET
Date: Sun, 18 Dec 2011 18:34:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51610

             Bug #: 51610
           Summary: [OOP] Class container does not properly handle POINTER
                    and TARGET
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid, rejects-valid
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org
                CC: janus@gcc.gnu.org, pault@gcc.gnu.org
            Blocks: 51605


The following program compiles - but it is invalid.

1. The TARGET attribute is required for "b" and "c"
   But if one tries to set it, one gets an error.
Expected: One can mark them as TARGET and without one gets an error
          for the CALL.

2. The "ptr => x" is invalid as "x" is not TARGET but no error is printed.
3. If one swaps the "x" and the "z" lines, one gets the error:
          ptr => x
          1
  Error: Non-POINTER in pointer association context (pointer assignment)
But one get also an error for the "ptr => y" and "ptr => z" lines.


Related is PR 51605: SELECT TYPE's associate-name needs to set TARGET attribute


       type t
       end type t
       class(t), allocatable :: a(:), b(:), c(:)
! Bogus error: Error: Duplicate TARGET attribute specified
!       target :: a, b, c
       allocate (a(1), b(1), c(1))
                       ! Requires: TARGET attribute - 
       call test(a, b, c) !   possibly not correctly diagnosed
     contains
       subroutine test(x, y, z)
        class(t), pointer, intent(in) :: z(:)
        class(t), target :: y(3)
        class(t) :: x(3)
        class(t), pointer :: ptr(:)
        ptr => x ! Invalid: "x" is not a TARGET
        ptr => y ! Valid: "x" is a TARGET
        ptr => z ! Valid: "z" is a POINTER
       end subroutine
     end