From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vincent Legoll <vincent.legoll@gmail.com>
Subject: Re: [PATCHES] gnu: linux-libre: Update to 4.16
Date: Sun, 8 Apr 2018 10:28:06 +0200
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To: Mark H Weaver <mhw@netris.org>
Cc: guix-devel <guix-devel@gnu.org>

Hello,

On Sun, Apr 8, 2018 at 3:10 AM, Mark H Weaver <mhw@netris.org> wrote:
> Leo Famulari <leo@famulari.name> writes:
>
>> On Sat, Apr 07, 2018 at 02:36:04PM -0400, Mark H Weaver wrote:
>>> One more thing: I had to add 'flex' and 'bison' as native-inputs because
>>> the build system in 4.16 now concludes that they need to be re-run for
>>> some reason.  This could perhaps be avoided by adding a phase to touch
>>> the generated files, but I didn't try it.
>>
>> I noticed this too while building 4.16 with Debian's tooling (`make
>> bindeb-pkg`).
>
> That's interesting.  I guess the timestamps in your unpacked source
> directory were probably not zeroed, so I guess that timestamps are not
> the issue here.

This is not specific to guix / guixsd building the kernel.

I think that's intentional, the kbuild system has been modified to always
regenerate the files from their sources.

See lkml discussion:
https://lkml.org/lkml/2017/8/19/49

See commit:
29c833061c1d8c2d1d23a62e7061561eadd76cdb

Merged in :
562f36ed28e6faa4245ea2ca1392d90ab98ebbe8

Hope that helps

-- 
Vincent Legoll