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Subject: Re: [PATCH 2/2] Enable 'make CONFIG_FOO=y oldconfig'
From: David Woodhouse <dwmw2@infradead.org>
To: Michal Marek <mmarek@suse.cz>
Cc: Arnaud Lacombe <lacombar@gmail.com>, Andreas Schwab <schwab@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org,
        linux-kbuild@vger.kernel.org
Date: Thu, 11 Aug 2011 16:50:34 +0100
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On Thu, 2011-08-11 at 17:24 +0200, Michal Marek wrote:
> 
> One of my use cases for all.config is
> 
> $ cp .../older-working-config all.config
> $ make KCONFIG_ALLCONFIG=1 allmodconfig
> 
> i.e. reuse what is possible from an older config and enable all new
> options. Surely it sometimes results in suboptimal configuration with
> unwanted debug options enabled, but most of the time it works. I won't
> be happy if you make it hard fail because of renamed or removed config
> options. 

On the other hand, 'make CONFIG_FOO=y oldconfig' probably *should* fail.
Perhaps it should set what it *can*, if you try to set multiple options
at once — but if it can't set all of them, it should exit with failure
status... which will mean that no subsequent build target will happen.

-- 
dwmw2