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Date: Fri, 22 Feb 2013 15:12:26 -0500
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Subject: Re: [gentoo-user] "auto-config" of new gentoo-sources?
From: Mike Gilbert <floppym@gentoo.org>
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On Fri, Feb 22, 2013 at 1:52 PM, Jarry <mr.jarry@gmail.com> wrote:
> So my question is: how is this possible? Is maybe ".config"
> file from the old sources-tree copied to new sources-tree?
> Or is the actual configuration of running kernel somehow
> detected and ".config" file generated?
>

The latter. Have a look at DEFCONFIG_LIST init/Kconfig.