linux-kernel - Re: [PATCH] perf tools: Kill off -Wcast-align

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Message-ID: <20091026062520.GA29580@elte.hu>
Date:	Mon, 26 Oct 2009 07:25:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Kill off -Wcast-align


* Paul Mundt <lethal@...ux-sh.org> wrote:

> The present use of -Wcast-align causes the build to blow up on SH due to
> generating a "cast increases required alignment of target type" error on
> each invocation of list_for_each_entry().
> 
> It seems that this was previously reported and killed off in the ia64
> support patch, but nothing seems to have happened with that. Presumably
> the same problem still remains there, too.
> 
> Signed-off-by: Paul Mundt <lethal@...ux-sh.org>

Is this a GCC bug producing false positive warnings? The GCC manpage 
says:

       -Wcast-align
           Warn whenever a pointer is cast such that the required alignment of the
           target is increased.  For example, warn if a "char *" is cast to an
           "int *" on machines where integers can only be accessed at two- or
           four-byte boundaries.

Which looks moderately useful - if it works.

	Ingo
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