[Bug fortran/93554] New: [8/9/10 Regression] ICE in expand_oacc_for, at omp-expand.c:6035

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93554

            Bug ID: 93554
           Summary: [8/9/10 Regression] ICE in expand_oacc_for, at
                    omp-expand.c:6035
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

With an unused allocatable array b, down to r6 :


$ cat z1.f90
program p
   type t
      integer :: a
      integer, allocatable :: b(:)
   end type
   type(t) :: x
   integer :: i
   !$acc kernels
   !$acc loop private(x)
   do i = 0, 31
      x%a = 1
   end do
   !$acc end kernels
end


$ gfortran-5 -c z1.f90 -fopenacc
$
$ gfortran-10-20200202 -c z1.f90 -fopenacc
during GIMPLE pass: ompexp
z1.f90:9:0:

    9 |    !$acc loop private(x)
      |
internal compiler error: in expand_oacc_for, at omp-expand.c:6035
0xbc7e0b expand_oacc_for
        ../../gcc/omp-expand.c:6034
0xbdaa27 expand_omp_for
        ../../gcc/omp-expand.c:6539
0xbdb5ea expand_omp
        ../../gcc/omp-expand.c:8817
0xbdb8de expand_omp
        ../../gcc/omp-expand.c:8803
0xbdd4ad execute_expand_omp
        ../../gcc/omp-expand.c:9046