linux-kernel - Re: [PATCH -v5] kbuild: Add extra gcc checks

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Date:	Thu, 10 Mar 2011 12:56:06 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Sam Ravnborg <sam@...nborg.org>, Michal Marek <mmarek@...e.cz>,
	Borislav Petkov <bp@...en8.de>, torvalds@...ux-foundation.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, bp@...64.org
Subject: Re: [PATCH -v5] kbuild: Add extra gcc checks

On Thursday 10 March 2011, Ingo Molnar wrote:
> Also, adding 3 lines per object file is pretty ugly - would it be possible to create 
> a nicer, compact, single-line way to someone condense a CONFIG_ERROR opt-out 
> mechanism, the -Werror default and the single-object-file into a single rule?
> 
> Something like:
> 
>   obj-werror-y += sched.o

I haven't tried it, but it could work (or be made to work) recursively,
so you can link multiple objects together and have them use the same flag e.g.

obj-y += obj_werror.o
ccflags-obj_werror.o += -Werror
obj-werror-y += sched.o module.o user.o

	Arnd
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