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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/50410] [4.6/4.7 Regression] ICE in record_reference
Date: Tue, 18 Oct 2011 07:23:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50410

--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-10-18 07:23:10 UTC ---
>>From the standard:
"C568 (R536) A data-i-do-object or a variable that appears as a
 data-stmt-object shall not be an object designator in which a
 pointer appears other than as the entire rightmost part-ref."

"C567 (R536) A variable whose designator appears as a
 data-stmt-object or a data-i-do-object shall not be a dummy
 argument, accessed by use or host association, in a named
 common block unless the DATA statement is in a block data
 program unit, in blank common, a function name, a function
 result name, an automatic object, or an allocatable variable."

To be fixed beyond the patch of attachment 25534
* ICE below (1) for init of DT with default init
* ICE below (2) with structure constructor, which initializes a pointer
(plus: test cases, revised error message wording)
* (3) Pointer init in DATA: Also "initial-data-target" is allowed

For the pointer init, see also PR 45290.

! =============== (1) =======================
module m
type t
  integer :: a  = 7
end type t
type t2
  integer :: b
end type t2
end module m

use m
implicit type(t)(x), type(t2)(y)
! ICE in trans:
! Invalid as "nonpointer object has default initialization"
DATA x%a/8/

! OK:
!DATA y%b/5/
!type(t2) :: y = t2(7) ! { dg-error "initializer already appears in a DATA
statement" }
end
! ============= (2) =========================
module m
  type t
    integer :: a
    integer, pointer :: bar
  end type t
end module m

subroutine test()
  use m
  type(t) :: x ! = t(4, null()) ! OK
 DATA x/t(4, null())/ ! ICE in the middle end
end subroutine test
! ============= (3) =========================
type t
  integer, pointer :: ptr
end type t
integer, target, save :: tgt

! Version A:
!type(t) :: x = t(tgt)
! Rejected with "has not been declared or is a variable,
!         which does not reduce to a constant expression"

! Version 2
type(t) :: x
DATA x%ptr /tgt/ ! error "must be a PARAMETER in DATA statement"

tgt = 7
print *, ptr
end