* Re: unsigned comparison warning
[not found] ` <489098BF.4070004@picochip.com>
@ 2008-07-30 22:07 ` Manuel López-Ibáñez
2008-09-23 13:06 ` Hariharan Sandanagobalane
0 siblings, 1 reply; 3+ messages in thread
From: Manuel López-Ibáñez @ 2008-07-30 22:07 UTC (permalink / raw)
To: Hariharan; +Cc: Ian Lance Taylor, gcc-help
2008/7/30 Hariharan <hariharans@picochip.com>:
> Thanks Ian. I will raise this in gcc-help mailing list.
GCC versions previous to 4.3 were inconsistent. This was fixed in GCC
4.3 by grouping all similar warnings under -Wtype-limits which is
enabled by -Wextra.
See http://gcc.gnu.org/gcc-4.3/changes.html
Cheers,
Manuel.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: unsigned comparison warning
2008-07-30 22:07 ` unsigned comparison warning Manuel López-Ibáñez
@ 2008-09-23 13:06 ` Hariharan Sandanagobalane
0 siblings, 0 replies; 3+ messages in thread
From: Hariharan Sandanagobalane @ 2008-09-23 13:06 UTC (permalink / raw)
To: Manuel López-Ibáñez; +Cc: gcc-help
Thanks Manuel. I personally feel that this warning should be a part of
-Wall.
Cheers
Hari
Manuel López-Ibáñez wrote:
> 2008/7/30 Hariharan <hariharans@picochip.com>:
>> Thanks Ian. I will raise this in gcc-help mailing list.
>
> GCC versions previous to 4.3 were inconsistent. This was fixed in GCC
> 4.3 by grouping all similar warnings under -Wtype-limits which is
> enabled by -Wextra.
>
> See http://gcc.gnu.org/gcc-4.3/changes.html
>
> Cheers,
>
> Manuel.
^ permalink raw reply [flat|nested] 3+ messages in thread
* unsigned comparison warning
@ 2008-07-30 19:18 Hariharan
0 siblings, 0 replies; 3+ messages in thread
From: Hariharan @ 2008-07-30 19:18 UTC (permalink / raw)
To: gcc-help, Hariharan Sandanagobalane
Hello,
I found something rather strange with the unsigned comparison warnings
in GCC.
If i had,
unsigned char a;
int foo ()
{
if (a >= 0)
return 0;
else
return 1;
}
and i did gcc -O2 -c trial.c, then i get a warning
trial.c:6: warning: comparison is always true due to limited range of
data type
It works the same way if i used an unsigned short. But, if i use
unsigned int/long, i dont get this warning. This is on x86. Is there an
explanation for this?
I had initially tried this with 4.1.1 (default on RHE5), but Ian
mentioned that the behaviour is the same on mainline with -Wextra.
Cheers
Hari
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-07-30 22:07 ` unsigned comparison warning Manuel López-Ibáñez
2008-09-23 13:06 ` Hariharan Sandanagobalane
2008-07-30 19:18 Hariharan
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