linux-kernel - Re: [PATCH -v4] kbuild: Add extra gcc checks

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Message-ID: <20110228182440.GA12411@a1.tnic>
Date:	Mon, 28 Feb 2011 19:24:40 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Sam Ravnborg <sam@...nborg.org>, Michal Marek <mmarek@...e.cz>
Cc:	torvalds@...ux-foundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	linux-kbuild@...r.kernel.org, bp@...64.org
Subject: Re: [PATCH -v4] kbuild: Add extra gcc checks

On Mon, Feb 21, 2011 at 12:03:22PM +0100, Borislav Petkov wrote:
> 
> Add a 'W=1' Makefile switch which adds additional checking per build
> object.
> 
> The idea behind this option is targeted at developers who, in the
> process of writing their code, want to do the occasional
> 
> make W=1 [target.o]
> 
> and let gcc do more extensive code checking for them. Then, they
> could eyeball the output for valid gcc warnings about various
> bugs/discrepancies which are not reported during the normal build
> process.
> 
> For more background information and a use case, read through this
> thread: http://marc.info/?l=kernel-janitors&m=129802065918147&w=2
> 
> -v4: Enable this for gcc only. Also, check for options which are not
> supported by every gcc version we use to build the kernel. Adding those
> checks for _every_ option slows down the build noticeably so be sensible
> here and add it only when your gcc version chokes on a particular
> option.
> 
> -v[2..3]: move to Makefile.build
> 
> Cc: Michal Marek <mmarek@...e.cz>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: linux-kbuild@...r.kernel.org
> Acked-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Borislav Petkov <bp@...en8.de>

Ping?

Michal, Sam,

any news here? FWIW, I've been build-testing amd64_edac.c with it and
have caught a bunch of buglets with it. IMHO, it really helps to enable
more extensive gcc checking in debugging builds.

Thanks.

-- 
Regards/Gruss,
Boris.
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