------- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-09
21:55 -------
(In reply to comment #4)
> Pointer subtraction is only defined for pointers to the same array object.
> So this code has undefined behaviour.
Yes that might be true but we can get a testcase where it fails even though it
is valid code:
void abort (void);
int
main (void)
{
unsigned char *b;
unsigned size;
b = ((unsigned char *)&b)+1;
/* location of pointer on stack - pointer - constvar */
size = ((unsigned char *) &b) - b;
if (size!=-1)
abort ();
return 0;
}
--
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21985
