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

From: Borislav Petkov
Date: Mon Feb 28 2011 - 13:24:49 EST

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:
> -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
> Cc: Michal Marek <mmarek@xxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: linux-kbuild@xxxxxxxxxxxxxxx
> Acked-by: Ingo Molnar <mingo@xxxxxxx>
> Signed-off-by: Borislav Petkov <bp@xxxxxxxxx>


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.


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