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

Borislav Petkov
2011-02-28T18:24:44Z

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@suse.cz>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: linux-kbuild@vger.kernel.org
> Acked-by: Ingo Molnar <mingo@elte.hu>
> Signed-off-by: Borislav Petkov <bp@alien8.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.