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From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 26 Nov 2009 14:13:53 +0100
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Subject: [Qemu-devel] Re: [PATCH] Makefile: Add missing rule for
	config-devices.mak
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To: qemu-devel@nongnu.org


> What about overwriting it automatically when it was not modified
> by the user? This would only need a backup copy of the original
> default configuration. I assume that most users don't change
> config-devices.mak, so they would be happy with this solution.
> Calling "make defconfig" is only the second best solution for them.
>
> A more sophisticated solution could try to create a patch from
> original default configuration and user modified configuration.
> Make could try to apply this patch to the new default configuration,
> and if there is no conflict, all is fine as well.

What about writing an include directive for the default config instead? 
  Then the user can add his overrides to the bottom of the include.

Paolo