nestfunc-4.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Origin: [e-mail]
   Test that return values come out right from a 1000-level call chain to
   functions without parameters that each need at least one "long"
   preserved.  Exposed problems related to the MMIX port.  */

long level = 0;
extern long foo (void);
extern long bar (void);

#ifdef STACK_SIZE
#define DEPTH ((STACK_SIZE) / 512 + 1)
#else
#define DEPTH 500
#endif

int
main (void)
{
  if (foo () == -42)
    exit (0);

  abort ();
}

long
foo (void)
{
  long tmp = ++level;
  return bar () + tmp;
}

long
bar (void)
{
  long tmp = level;
  return tmp > DEPTH - 1 ? -42 - tmp : foo () - tmp;
}