* Warning Behavior
@ 2005-08-23 6:55 Ivan Novick
2005-08-23 7:09 ` Paolo Bonzini
2005-08-23 8:40 ` Andreas Schwab
0 siblings, 2 replies; 4+ messages in thread
From: Ivan Novick @ 2005-08-23 6:55 UTC (permalink / raw)
To: gcc
Hello,
How come the following code would not be considered a Warning?
Surely there is no possible way this would be intentional?
if (x<4);
x++;
Cheers,
Ivan
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Warning Behavior
2005-08-23 6:55 Warning Behavior Ivan Novick
@ 2005-08-23 7:09 ` Paolo Bonzini
2005-08-23 8:40 ` Andreas Schwab
1 sibling, 0 replies; 4+ messages in thread
From: Paolo Bonzini @ 2005-08-23 7:09 UTC (permalink / raw)
To: GCC Development, Ivan.Novick
Ivan Novick wrote:
> Hello,
>
> How come the following code would not be considered a Warning?
>
> Surely there is no possible way this would be intentional?
>
> if (x<4);
> x++;
When you consider macro expansion, it could:
#if SIZEOF_LONG == 4
#define WARN_FOR_BIG_VALUES \
printf ("hey, x is too big, keeping low bits only!")
#else
#define WARN_FOR_BIG_VALUES /* nothing */
#endif
...
long f (long long x)
{
if (x > LONG_MAX)
WARN_FOR_BIG_VALUES;
return x & LONG_MAX;
}
(I'm not saying this is good code).
Paolo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Warning Behavior
2005-08-23 6:55 Warning Behavior Ivan Novick
2005-08-23 7:09 ` Paolo Bonzini
@ 2005-08-23 8:40 ` Andreas Schwab
2005-08-23 13:34 ` jlh
1 sibling, 1 reply; 4+ messages in thread
From: Andreas Schwab @ 2005-08-23 8:40 UTC (permalink / raw)
To: Ivan Novick; +Cc: gcc
Ivan Novick <Ivan.Novick@makoglobal.com> writes:
> How come the following code would not be considered a Warning?
Try -Wextra.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, MaxfeldstraÃe 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-08-23 12:14 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2005-08-23 6:55 Warning Behavior Ivan Novick
2005-08-23 7:09 ` Paolo Bonzini
2005-08-23 8:40 ` Andreas Schwab
2005-08-23 13:34 ` jlh
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