linux-kernel - Re: [PATCH] kbuild: specify absolute paths for cscope

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Message-ID: <4B1514C8.3000505@suse.cz>
Date:	Tue, 01 Dec 2009 14:06:16 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Sam Ravnborg <sam@...nborg.org>, linux-kbuild@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: specify absolute paths for cscope

On 1.12.2009 10:42, Daniel Vetter wrote:
> I've just tried to use cscope with a working directory not equal to the
> directory where cscope.out resides:
> 
> $ cscope -d -f src/cscope.out
> 
> It can't handle relative paths. When I try to open a file (via a
> reference) from within cscope, it calls up vim with the wrong path.  So I
> think this is a fundamental cscope bug (and not a vim problem).  As I've
> already said, every tutorial on the web I could find uses absolute paths,
> too, so the problem seems to be common, as is the work-around.  Therefore
> please apply this patch (perhaps changing my comment to "cscope is broken
> with relative paths, work around it via absolute paths").

OK, you convinced me. I applied it to for-next, with a minor edit to fix
O= builds (the tree variable is an absolute path already):
http://repo.or.cz/w/linux-kbuild.git/commitdiff/037aaae02ecf3925b843316868743c755d73fb22
I hope the next guy won't come and complain the he moved linux-2.6.xy to
linux-2.6.xy.orig and cscope stopped working :).


On 30.11.2009 19:11, Sam Ravnborg wrote:
> For tags I recall we fall back to absolute path only for O=... builds.
> This made the tags file considerably smaller for a non O=.. build
> thus speeding up the search.
> 
> So unconditionally using absolute paths for cscope may have drawbacks.

I tried it and this part seems OK. Generating the database took more or
less the same time, cscope.out grew by less than 1% and opening cscope
and running a query for 'printk' slowed down by about 8%, I think that's
bearable.

Michal
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