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Message-Id: <20090528004100.3716e00d.akpm@linux-foundation.org>
Date: Thu, 28 May 2009 00:41:00 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Amerigo Wang <amwang@...hat.com>
Cc: linux-kernel@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [Patch] kbuild: fix a compile warning
On Fri, 15 May 2009 03:51:18 -0400 Amerigo Wang <amwang@...hat.com> wrote:
>
> I got this warning:
With which gcc version?
> HOSTCC scripts/basic/fixdep
> scripts/basic/fixdep.c: In function 'traps':
> scripts/basic/fixdep.c:377: warning: dereferencing type-punned pointer will break strict-aliasing rules
> scripts/basic/fixdep.c:379: warning: dereferencing type-punned pointer will break strict-aliasing rules
>
(wtf?)
>
> --- a/scripts/basic/fixdep.c
> +++ b/scripts/basic/fixdep.c
> @@ -373,10 +373,11 @@ void print_deps(void)
> void traps(void)
> {
> static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
> + int *p = (int *)test;
>
> - if (*(int *)test != INT_CONF) {
> + if (*p != INT_CONF) {
> fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",
> - *(int *)test);
> + *p);
> exit(2);
> }
> }
--
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