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

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Message-ID: <20110220171122.GA7050@elte.hu>
Date:	Sun, 20 Feb 2011 18:11:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Michal Marek <mmarek@...e.cz>, torvalds@...ux-foundation.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: Add extra gcc checks


* Borislav Petkov <bp@...en8.de> 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/?i=20110218091716.GA4384@bicker
> 
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Michal Marek <mmarek@...e.cz>
> Cc: linux-kbuild@...r.kernel.org
> Signed-off-by: Borislav Petkov <bp@...en8.de>

Nice.

Acked-by: Ingo Molnar <mingo@...e.hu>

We enable a lot of GCC warnings in tools/perf/ as well, and while there are false 
positives occasionally, the general effect on code quality is positive. We combine 
it with -Werror to make sure warnings do not accumulate.

Thanks,

	Ingo
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