linux-kernel - Re: [PATCH] kbuild: unconditionally clobber include/linux/version.h on distclean

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Message-ID: <16324.1392504881@warthog.procyon.org.uk>
Date:	Sat, 15 Feb 2014 22:54:41 +0000
From:	David Howells <dhowells@...hat.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [PATCH] kbuild: unconditionally clobber include/linux/version.h on distclean

Paul Gortmaker <paul.gortmaker@...driver.com> wrote:

> As of v3.7, the UAPI changes relocated headers around such that the
> kernel version header lived in a new place.
> 
> If a person is bisecting and if you go back to pre-UAPI days,
> you will create an include/linux/version.h  -- then if you checkout a
> post-UAPI kernel, and even run "make distclean" it still won't delete
> that old version file.  So you get a situation like this:
> 
> $ grep -R LINUX_VERSION_CODE include/
> include/generated/uapi/linux/version.h:#define LINUX_VERSION_CODE 200192
> include/linux/version.h:#define LINUX_VERSION_CODE 132646
> 
> The value in that second line is representative of a v2.6.38 version.
> And it will be sourced/used, hence leading to strange behaviours, such
> as drivers/staging content (which typically hasn't been purged of version
> ifdefs) failing to build.
> 
> Since it is a subtle mode of failure, lets always clobber the old
> file when doing a distclean.
> 
> Cc: Michal Marek <mmarek@...e.cz>
> Cc: David Howells <dhowells@...hat.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Acked-by: David Howells <dhowells@...hat.com>
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