gcc/testsuite/gfortran.dg/pointer_remapping_10.f90

   1 ! { dg-do run }
   2 ! { dg-options "-fcheck=all" }
   3 !
   4 ! PR fortran/71194
   5 !
   6 ! Contributed by T Kondic
   7 !
   8 program ice
   9 implicit none
  10 integer, parameter :: pa=10, pb=20
  11 complex, target :: a(pa*pb)
  12 real, pointer:: ptr(:,:) =>null()
  13 integer :: i, j, cnt
  14 logical :: negative
  15
  16   do i = 1, size(a)
  17     a(i) = cmplx(i,-i)
  18   end do
  19
  20   ! Was ICEing before with bounds checks
  21   ptr(1:pa*2,1:pb) => conv2real(a)
  22
  23   negative = .false.
  24   cnt = 1
  25   do i = 1, ubound(ptr,dim=2)
  26     do j = 1, ubound(ptr,dim=1)
  27       if (negative) then
  28         if (-cnt /= ptr(j, i)) STOP 1
  29         cnt = cnt + 1
  30         negative = .false.
  31       else
  32         if (cnt /= ptr(j, i)) STOP 2
  33         negative = .true.
  34       end if
  35     end do
  36   end do
  37
  38 contains
  39   function conv2real(carr)
  40     use, intrinsic :: iso_c_binding
  41     ! returns real pointer to a complex array
  42     complex, contiguous, intent(inout), target  :: carr(:)
  43     real,contiguous,pointer :: conv2real(:)
  44     call c_f_pointer(c_loc(carr),conv2real,[size(carr)*2])
  45   end function conv2real
  46 end program