Re: Spurious rebuilds of raid6 and drivers/media/video in 2.6.16

[Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>]

Sam Ravnborg schrieb:
> On Thu, Mar 30, 2006 at 01:55:55PM +0200, Carl-Daniel Hailfinger wrote:
> 
>>Hi,
>>
>>if I copy a compiled kernel tree to another location and run
>>make again in the new directory, a few files always get rebuilt.
>>These files only are rebuilt if the tree is a copy of another
>>tree and they are rebuilt only once.
>>Any ideas why this is the case?
> 
> The reason why the predictive rebuild happens is that in some parts
> of the kbuild files it has been necessary to use absolute paths.
> One example is the oiu2c shell script where we use the full path
> to locate the shell script.
> The reason why a full path is used is that this shall also work when
> compiling the kernel using make O=...

Thanks for the information.

> So the rebuild will happen. It would be possible to minimize the places
> where a rebuild is triggered when moving the source tree, but I have not
> seen any benefit doing so lately.

Well, it would cause less confusion. It seems that ~90% of rebuilt files
are due to the following makefiles where full paths to includes are
specified:
./drivers/media/video/cx88/Makefile
./drivers/media/video/Makefile
./drivers/media/video/cx25840/Makefile
./drivers/media/video/saa7134/Makefile
./drivers/media/video/em28xx/Makefile

Any objections to fix these?


Regards,
Carl-Daniel
-- 
http://www.hailfinger.org/