[Bug c/20318] RFE: add attribute to specify that a function never returns NULL

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-03 14:20 -------
Here is a reduced testcase for the SVN code:
void *g();

static void *count_and_verify_instructions(int *ninst,const unsigned char *p)
{
   if (p == ((void *)0))
    return g();
 *ninst = 0;
 return 0;
}
void f(int);
void *decode_window(const unsigned char *data)
{
  int ninst;
  void *svn_err__temp = count_and_verify_instructions(&ninst, data);
  if (svn_err__temp)
    return svn_err__temp;

  f (ninst);
  return 0;
}
----- cut ---------
g returns only non null values.

This reduced testcase comes from PR 21320 which comes from OLH.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2005-03-04 15:38:22         |2005-06-03 14:20:19
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20318