[Bug fortran/80142] New: [7 Regression] Warning: No location in expression ... with -O / -ffrontend-optimize

["anlauf at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80142

            Bug ID: 80142
           Summary: [7 Regression] Warning: No location in expression ...
                    with -O / -ffrontend-optimize
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anlauf at gmx dot de
  Target Milestone: ---

Hello all,

current trunk produces a strange warning for the following code
when either optimization is enabled or -ffrontend-optimize:


% gfc-trunk -c gfcbug140.f90 -ffrontend-optimize
gfcbug140.f90:14:43:

     if (any (basis == wv_CDV_list(:))) then
                                           1
Warning: No location in expression near (1)
gfcbug140.f90:14:43: Warning: No location in expression near (1)


% cat gfcbug140.f90
! Bug with -O / -ffrontend-optimize
MODULE gfcbug140
  implicit none
  integer ,parameter :: WV_NONE        =  1
  integer, parameter :: WV_CDV_4       =  23
  integer, parameter :: WV_CDV_8       =  24
  integer, parameter :: wv_CDV_list(2) = [ WV_CDV_4, WV_CDV_8 ]
  integer            :: basis          = WV_NONE
contains
  subroutine wave_1d (x)
    real, intent(inout) :: x(:,:)
    integer             :: oldbase
    oldbase = basis
    if (any (basis == wv_CDV_list(:))) then
    end if
    basis = oldbase
  end subroutine wave_1d
  !-
  subroutine mr_gp_mat (A)
    real, intent(inout) :: A (:,:)
    call wave_1d (A)
  end subroutine mr_gp_mat
end module gfcbug140