linux-kernel - Re: [PATCH] kbuild: add documentation of KBUILD_BUILD

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Message-ID: <55297BE2.60401@suse.cz>
Date:	Sat, 11 Apr 2015 21:54:10 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Nicholas Mc Guire <der.herr@...r.at>,
	Jonathan Corbet <corbet@....net>
CC:	Nicholas Mc Guire <hofrat@...dl.org>, linux-kbuild@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: add documentation of KBUILD_BUILD_VERSION

Dne 11.4.2015 v 15:20 Nicholas Mc Guire napsal(a):
> On Sat, 11 Apr 2015, Jonathan Corbet wrote:
> 
>> On Sun,  5 Apr 2015 08:44:28 +0200
>> Nicholas Mc Guire <hofrat@...dl.org> wrote:
>>
>>> KBUILD_BUILD_VERSION is currently not documented but it is
>>> needed when rebuilding a kernel that should result in the identical
>>> binary. This is a brief documentation of KBUILD_BUILD_VERSION.
>>
>> Can we add something like the above to the document itself so that
>> readers have an idea of why they might want to tweak this?
>>
>> Either way, I can take it in the docs tree if that's best..Michal?
>>
> I thought of that but it would be inconsistent as all other descriptions
> here are only the function not the use.

Most of the entries in this file predate efforts at deterministic
builds, so I'd prefer usefulness over consistency here :-).


> I did not find a file where 
> the problem of identical rebuild would really fit.

... unless, of course, you want to start a new file covering this topic.
Because it's not just the few override variables, but also some options
have to be turned off (I remember CONFIG_GCOV_KERNEL) and the paths must
be the same, or relative paths must be used.

Michal
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