20000111-1.c

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

/* Copyright (C) 2000  Free Software Foundation.

   by Alexandre Oliva  <[e-mail]>  */

/* { dg-do compile } */

__inline int
foo (int **q) {
  return *q && **q;
}

void
bar () {
  int **p;
  if (foo (p))
    do_something ();
}