[Bug other/29694] missed warnings about comparisons which are always true/false.

pluto at agmk dot net gcc-bugzilla@gcc.gnu.org
Fri Nov 3 10:44:00 GMT 2006



------- Comment #2 from pluto at agmk dot net  2006-11-03 10:44 -------
(In reply to comment #1)
> Adding -W/-Wextra and we get a warning:
> t.c: In function �foo�:
> t.c:3: warning: comparison of unsigned expression < 0 is always false
> t.c:5: warning: comparison of unsigned expression >= 0 is always true
> 
> 
> I always forget what -Wextra is for.

what about -Walways-true ?

<man>

-Walways-true

   Warn about comparisons which are always true such as testing if
   unsigned values are greater than or equal to zero. This warning
   is enabled by -Wall.

</man>


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29694



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