linux-kernel - Re: [PATCH] use %p for pointers

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Message-ID: <452D566A.50705@zytor.com>
Date:	Wed, 11 Oct 2006 13:39:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jakub Jelinek <jakub@...hat.com>
CC:	Al Viro <viro@....linux.org.uk>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>, torvalds@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use %p for pointers

Jakub Jelinek wrote:
> On Wed, Oct 11, 2006 at 11:45:10AM -0700, H. Peter Anvin wrote:
>> Al Viro wrote:
>>> %p will do no such thing in the kernel.  As for the difference...  %x
>>> might happen to work on some architectures (where sizeof(void 
>>> *)==sizeof(int)),
>>> but it's not portable _and_ not right.  %p is proper C for that...
>> It's really too bad gcc bitches about %#p, because that's arguably The 
>> Right Thing.
> 
> It is correct that gcc warns about %#p, that invokes undefined behavior
> in ISO C99.
> 

Yes, it's a bug in the standard.

	-hpa

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