linux-kernel - Re: [PATCH] perf: fix gcc4.6 build failure with unused-but-set warning

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Date:	Fri, 3 Jun 2011 09:41:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Darren Hart <dvhart@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Bruce Ashfield <bruce.ashfield@...driver.com>
Subject: Re: [PATCH] perf: fix gcc4.6 build failure with unused-but-set
 warning


* Darren Hart <dvhart@...ux.intel.com> wrote:

> This patch creates a new perf/Makefile variable, LESS_WARNINGS and 
> adds -Wno-unused-but-set-variable. The new variable helps 
> distinguish between the added warnings in EXTRA_WARNINGS versus 
> those we want to remove, including the existing -Wno-system-headers 
> which I moved to LESS_WARNINGS.

Btw., while you resolved the issue, it would nevertheless nice to 
introduce a 'make WERROR=0' build method that removes -Werror.

Would you be interested in sending a patch for that?

There would be several advantages of such a patch:

 - GCC often introduces new warnings with lots of false positives - 
   breaking -Werror builds. WERROR=0 would allow one to build perf 
   without much fuss - while people would still send patches to avoid 
   the fuss of having to type WERROR=0 :-)

 - bisecting back to commits that produce a (mostly harmless) warning 
   on some compiler is more difficult. With WERROR=0 one could bisect 
   without worrying about harmless warnings.

Thanks,

	Ingo
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