linux-kernel - Re: [PATCH 2/5] kbuild: LLVMLinux: Adapt warnings for compilation with clang

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Date:	Tue, 25 Feb 2014 18:38:51 -0800
From:	Behan Webster <behanw@...verseincode.com>
To:	Dave Jones <davej@...hat.com>, mmarek@...e.cz, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org,
	sparse@...isli.org, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-sparse@...r.kernel.org,
	torvalds@...ux-foundation.org, dwmw2@...radead.org,
	pageexec@...email.hu,
	Jan-Simon Möller 
	<dl9pf@....de>, Mark Charlebois <mcharleb@...il.com>
Subject: Re: [PATCH 2/5] kbuild: LLVMLinux: Adapt warnings for compilation
 with clang

On 02/25/14 17:17, Dave Jones wrote:
> On Tue, Feb 25, 2014 at 05:08:40PM -0800, behanw@...verseincode.com wrote:
>   
>   > When compiling kernel with clang, disable warnings which are too noisy, and
>   > add the clang flag catch-undefined-behavior.
>   >
>   > +# Clang
>   > +warning-1 += $(call cc-disable-warning, initializer-overrides)
>   > +warning-1 += $(call cc-disable-warning, unused-value)
>   > +warning-1 += $(call cc-disable-warning, format)
>   > +warning-1 += $(call cc-disable-warning, unknown-warning-option)
>   > +warning-1 += $(call cc-disable-warning, self-assign)
>   > +warning-1 += $(call cc-disable-warning, sign-compare)
>   > +warning-1 += $(call cc-disable-warning, format-zero-length)
>   > +warning-1 += $(call cc-disable-warning, uninitialized)
>   > +warning-1 += $(call cc-option, -fcatch-undefined-behavior)
>
> Do you have a pointer to an example log-file from before this change ?
> I'm curious for eg, which self-assign warnings are showing up,
> because I've been fixing up the ones that Coverity found, of which
> there are only a dozen or so left iirc.
I count 22 in this particular x86 kernel build (some of which you may 
well have fixed already). Enjoy.

http://buildbot.llvm.linuxfoundation.org/self-assign-build.log.txt

Perhaps I should re-enable that warning, considering the number has 
dropped so dramatically from when I last checked over a year ago.

Thanks,

Behan

-- 
Behan Webster
behanw@...verseincode.com

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