linux-kernel - Re: Build-failure with old files in build-directory (Was: Linux 3.9 released)

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Date:	Fri, 03 May 2013 09:47:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthias Schniedermeyer <ms@...d.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: Build-failure with old files in build-directory (Was: Linux 3.9
 released)

On 04/29/2013 01:36 AM, Matthias Schniedermeyer wrote:
> On 28.04.2013 17:56, Linus Torvalds wrote:
> 
> I'm not sure if it is supported, but building with a O= -directory that 
> was previously used to build a 3.8.9-kernel that was "clean"ed (but not 
> "mrproper"ed) before building 3.9 results in a build-failure:
> make[2]: *** No rule to make target `/xssd/usr_src/ko/leeloo/include/config/hz.h', needed by `kernel/hz.bc'.  Stop.
> 
> After deleting everything in the KBUILD_OUTPUT-directory, except the 
> .config-file, the kernel-build worked again.
> 
> At least in the past a "clean" seamed to be enough. I had a file with a 
> 2.6.39-name inside, so it seams i have build my kernels this way for the 
> last few releases.
> 

This seems to be the fundamental problem here... include/config is used
to track dependencies on configuration, but it looks like there are
events that seem to delete include/config without them being regenerated?

	-hpa


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