This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug other/29694] missed warnings about comparisons which are always true/false.
- From: "pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Nov 2006 10:44:09 -0000
- Subject: [Bug other/29694] missed warnings about comparisons which are always true/false.
- References: <bug-29694-7667@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- 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>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29694