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Date: Wed, 9 Mar 2011 18:56:25 +0100
From: Sam Ravnborg <sam@ravnborg.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Michal Marek <mmarek@suse.cz>, Borislav Petkov <bp@alien8.de>,
        Arnd Bergmann <arnd@arndb.de>, torvalds@linux-foundation.org,
        x86@kernel.org, linux-kernel@vger.kernel.org,
        linux-kbuild@vger.kernel.org, bp@amd64.org
Subject: Re: [PATCH -v5] kbuild: Add extra gcc checks
Message-ID: <20110309175625.GA29181@merkur.ravnborg.org>
References: <20110301083529.GA767@liondog.tnic> <20110309144504.GA1096@sepie.suse.cz> <20110309151134.GA15730@elte.hu>
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> Another, related, very nice kbuild feature would be to allow for arch maintainers to 
> mark certain files as "should only build fine without warnings" - i.e. -Werror 
> should be the default. There would be a Kconfig feature to opt out of this, 
> CONFIG_CC_IGNORE_WARNINGS=y or so. This would allow for people to still build the 
> kernel with old (or buggy) versions of GCC.

To add -Werror for all files conditionally you can do:

    ccflags-$(CONFIG_WERROR) += -Werror

For individual files we can then drop -Werror like this:

    CFLAGS_REMOVE_foobar.o := -Werror

So it should be doable with the existing infrastructure.

	Sam