[Bug c/41882] gcc bug when comparing x to -x (linux, 32-bit)

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2009-10-30 22:23 -------
signed overflow invokes undefined behavior.  You can use -fwrapv to make it
wrapping.  Or you can use unsigned types for the comparison, like

 if ((unsigned)x != -(unsigned)x)


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41882