From: Ingo Molnar <mingo@elte.hu>
To: Paul Mundt <lethal@linux-sh.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf tools: Kill off -Wcast-align
Date: Mon, 26 Oct 2009 07:25:20 +0100 [thread overview]
Message-ID: <20091026062520.GA29580@elte.hu> (raw)
In-Reply-To: <20091026054000.GA13517@linux-sh.org>
* Paul Mundt <lethal@linux-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@linux-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
next prev parent reply other threads:[~2009-10-26 6:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-26 5:40 [PATCH] perf tools: Kill off -Wcast-align Paul Mundt
2009-10-26 6:25 ` Ingo Molnar [this message]
2009-10-26 9:47 ` Paul Mundt
2009-10-26 10:08 ` Pekka Enberg
2009-10-26 11:21 ` Ingo Molnar
2009-10-26 22:40 ` David Miller
2009-10-27 13:50 ` Ingo Molnar
2009-10-28 0:59 ` David Miller
2009-10-26 11:38 ` [tip:perf/urgent] perf tools: Remove -Wcast-align tip-bot for Paul Mundt
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