https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97242
Bug ID: 97242
Summary: Pointer assignment: Noncontiguous target to contiguous
pointer wrongly accepted.
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
Target Milestone: ---
The lines:
P => B(i)%A(:,::3,::4) ! <<<
P => C(::2,::2,::2) ! <<<
are wrongly accepted – although the compiler can know that it is invalid →
gfc_is_not_contiguous() should detect this.
--------------
implicit none
type t
integer, allocatable :: A(:,:,:)
end type t
type(t), target :: B(5)
integer, pointer, contiguous :: P(:,:,:)
integer, target :: C(5,5,5)
integer :: i
i = 1
! OK: contiguous
P => B(i)%A
P => B(i)%A(:,:,:)
P => C
P => C(:,:,:)
call foo (B(i)%A)
call foo (B(i)%A(:,:,:))
call foo (C)
call foo (C(:,:,:))
! Invalid - not contiguous
! "If the pointer object has the CONTIGUOUS attribute, the pointer target shall
be contiguous."
! → known to be noncontigous (not always checkable, however)
P => B(i)%A(:,::3,::4) ! <<<
P => C(::2,::2,::2) ! <<<
! This following is stricter:
! C1541 The actual argument corresponding to a dummy pointer with the
! CONTIGUOUS attribute shall be simply contiguous (9.5.4).
call foo (B(i)%A(:,::3,::4)) ! { dg-error "must be simply contiguous" }
call foo (C(::2,::2,::2)) ! { dg-error "must be simply contiguous" }
contains
subroutine foo(Q)
integer, pointer, intent(in), contiguous :: Q(:,:,:)
end subroutine foo
end
