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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99506] internal compiler error: in record_reference, at
 cgraphbuild.c:64
Date: Wed, 10 Mar 2021 07:53:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99506

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Priority|P3                          |P4
   Last reconfirmed|                            |2021-03-10
            Version|unknown                     |11.0
     Ever confirmed|0                           |1
                 CC|                            |marxin at gcc dot gnu.org

--- Comment #1 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Reduced test-case:

module numeric_kinds
  integer, parameter :: single =3D kind(1.0)
  integer, parameter :: double =3D selected_real_kind(2*precision(1.0_singl=
e))
end module  numeric_kinds
module indices
contains
  function find_idx(x, xx) result(idx)
  end function find_idx
  function nearest_idx(x, xx) result(idx)
      if (x < xx0) then
         if (xx0 - x < 0/2) then
         end if
      end if
      do
         if (dl >=3D 0 .and. last_dl <=3D 0) then
         end if
      end do
   end function nearest_idx
  function close_enough_idx(x, xx, eps, verbose) result(res)
    logical, intent(in), optional:: verbose
    if (abs0 <=3D eps) then
      if (present(verbose)) then
        if (verbose .eqv. .true.) then
        end if
      end if
    end if
  end function close_enough_idx
end module indices
program fix_track_partials
  use numeric_kinds, only: double
  character(*), parameter:: &
      youf =3D "track-partial-nws200-y-grid.dat"
  integer, parameter:: &
      lonw100 =3D 10000, lats100 =3D -4000, dlon100 =3D 10, dlat100 =3D 10
  integer, parameter:: imax =3D 50, jmax =3D 350
  integer, dimension(*), parameter:: &
      latt100 =3D [((lats100 + dlat100 * j - dlat100/2), j=3D1,jmax)]
  real(double), dimension(*), parameter:: &
      latt =3D [(latt100(i)/100.d0, j=3D1,jmax)]
  real(double), dimension(:), allocatable:: xs, ys, xs_fixed, ys_fixed
  call move_to_nearest(ys_fixed, pnts=3Dys, axis=3Dlatt)
contains
  subroutine read_track(xs, ys, file)
  end subroutine read_track
  subroutine save_track(xs, ys, file)
  end subroutine save_track
  subroutine move_to_nearest(res, pnts, axis)
    real(double), intent(out):: res(:)
    real(double), intent(in) :: pnts(:), axis(:)
  end subroutine move_to_nearest
  subroutine extend_arr_double(arr, idx, mes)
  end subroutine extend_arr_double
  subroutine shrink_arr_double(arr, idx, mes)
  end subroutine shrink_arr_double
end program fix_track_partials


It's very old, at least as old as GCC 4.8.0.=