linux-kernel - Re: kbuild: Unnecessary recompiles on path change

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Message-ID: <alpine.LNX.1.10.0809111404520.24368@fbirervta.pbzchgretzou.qr>
Date:	Thu, 11 Sep 2008 14:07:53 -0400 (EDT)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Jeff Dike <jdike@...toit.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sam@...nborg.org
Subject: Re: kbuild: Unnecessary recompiles on path change

On Wednesday 2008-09-10 16:15, Jan Engelhardt wrote:

>Hi,
>
>I notice that my kernels get needlessy recompiled if I access the source 
>tree through a different directory. In other words, /lo/linux is the 
>kernel tree, and `mount --bind /lo /home/jengelh/lo` is in effect.
>
>I see the absolute path being stored in .*.o.cmd files, which seems like 
>all the explanation I need. I do remember that I left a comment 
>when something like that was afloating:
>http://www.nabble.com/-RFC-PATCH-3-6--kbuild:-convert-include-and-source-paths-td17064364.html
>
>As of v2.6.27-rc4-263-g5697a99, there's no gcov in (at least there is no 
>such thing in my .config when bulit with ARCH=um), but the issue with 
>absolute paths exists.

It seems that only ARCH=um builds have this issue.
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