linux-kernel - Re: "eliminate warn_on_slowpath()" change causes many gcc-3.2.3 warnings

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Message-ID: <20090117213852.GC1700@bombadil.infradead.org>
Date:	Sat, 17 Jan 2009 16:38:52 -0500
From:	Kyle McMartin <kyle@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kyle McMartin <kyle@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Mikael Pettersson <mikpe@...uu.se>,
	linux-kernel@...r.kernel.org
Subject: Re: "eliminate warn_on_slowpath()" change causes many gcc-3.2.3
	warnings

On Sat, Jan 17, 2009 at 01:07:58PM -0800, H. Peter Anvin wrote:
> Kyle McMartin wrote:
> > 
> > How about something utterly evil? (Since you can't pass a zero-length
> > string to a printf attributed function either...)
> > 
> 
> ?!
> 
> *That* should definitely be permitted... anything else is an utter bug.
> 

Sadly, 
kyle@...tethathostname ~ $ cat foo.c
#include <stdio.h>
int main(void) {
	printf("");
	return 0;
}
kyle@...tethathostname ~ $ gcc -O2 -Wall -o foo foo.c
foo.c: In function âmainâ:
foo.c:3: warning: zero-length printf format string

gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) 
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