linux-kernel - Re: [PATCH 1/4] compiler.h: introduce unused

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Message-ID: <4F97E550.4060208@gmail.com>
Date:	Wed, 25 Apr 2012 19:51:44 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/4] compiler.h: introduce unused_expression() macro

On 04/25/2012 07:26 PM, Konstantin Khlebnikov wrote:
> Sometimes we want to check some expressions correctness in compile-time without
> generating extra code. "(void)(e)" does not work if expression has side-effects.
> This patch introduces macro unused_expression() which helps in this situation.
>

Interesting, I am wondering why gcc doesn't eliminate the code as we 
pass either -O2 or -Os to it.
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