text: 
  const double dnan = 1.0/0.0 - 1.0/0.0;
  double x = 1.0;
  
  extern void link_error (void);
  extern void abort (void);
  
  main ()
  {
  #if ! defined (__vax__) && ! defined (_CRAY)
    /* NaN is an IEEE unordered operand.  All these test should be false.  */
    if (dnan == dnan)
      link_error ();
    if (dnan != x)
      x = 1.0;
    else
      link_error ();
  
    if (dnan < x)
      link_error ();
    if (dnan > x)
      link_error ();
    if (dnan <= x)
      link_error ();
    if (dnan >= x)
      link_error ();
    if (dnan == x)
      link_error ();
  #endif
    exit (0);
  }
  
  #ifndef __OPTIMIZE__
  void link_error (void)
  {
    abort ();
  }
  #endif
  
  