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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/49624] New: ICE with pointer-bound remapping
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49624

           Summary: ICE with pointer-bound remapping
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org


Assume:
  integer, target :: A(100)
  integer,pointer :: P(:,:)
  p(10,1:) => A
  end

Compiling the program with gfortran results in:

test.f90:4:0: internal compiler error: in gfc_trans_pointer_assignment, at
fortran/trans-expr.c:5081


While the following variant gives:
  p(1:10,1:) => A
  1
Error: Either all or none of the upper bounds must be specified at (1)

Also the valid "p(1:10,1:10) => A" works.


I think the compiler is right about rejecting the code, one finds:

R733 pointer-assignment-stmt
         is  data-pointer-object [ (bounds-spec-list) ] => data-target
         or  data-pointer-object (bounds-remapping-list ) => data-target
       [...]
R735 bounds-spec is lower-bound-expr :
R736 bounds-remapping is lower-bound-expr : upper-bound-expr
C716 (R733) If bounds-spec-list is specified, the number of bounds-specs
            shall equal the rank of data-pointer-object.
C717 (R733) If bounds-remapping-list is specified, the number of
            bounds-remappings shall equal the rank of data-pointer-object.
C718 (R733) If bounds-remapping-list is not specified, the ranks of
            data-pointer-object and data-target shall be the same.


Thus, for bounds remapping both lower and upper bounds are required.