Ticket #18656: foo.c

#include <fenv.h>
#include <stdio.h>

static double zero;
static double volatile qnand;
int volatile c;

static void
raise_invalid_comparison ()
{
  double volatile a, b;
  a = qnand; b = qnand;
  c = a > b;
}

int
main (int argc, char *argv[])
{
  qnand = zero / zero;
  feclearexcept (FE_ALL_EXCEPT);
  if (feenableexcept (FE_ALL_EXCEPT) == -1)
    return 2;
  raise_invalid_comparison ();
  return 0;
}