[Bug middle-end/50790] ICE in copy_constant on divide by expression that evaluates to zero

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50790

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org
          Component|fortran                     |middle-end

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-10-19 
15:23:55 UTC ---
-fdump-tree-original:

      static integer(kind=4) C.1534 = 3 / 0;
      _gfortran_transfer_integer_write (&dt_parm.0, &C.1534, 4);

It gives with 4.7 the ICE:
  internal compiler error: in copy_constant, at varasm.c:3031

I think it is - at least in general - not be detectable in the front end but
only in the ME.



A similar C test case works (cf. below for a simpler version); I think there is
no compiler option to print a warning -- at least -Wall -Wextra don't.

int
main ()
{
  int i = 3;
  printf ("%d\n", 3/(i-i));
  return 0;
}