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Date: Wed, 25 Apr 2012 15:54:31 +0400 From: Konstantin Khlebnikov <khlebnikov@...nvz.org> To: Cong Wang <xiyou.wangcong@...il.com> CC: Linus Torvalds <torvalds@...ux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arch@...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 Cong Wang wrote: > 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. It cannot do this if expression has some side-effects, for example if it contains BUG(). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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