linux-kernel - Re: cscope: issue with symlinks in tools/testing/selftests/powerpc/copyloops/

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Message-ID: <20140407153647.GA17258@hmsreliant.think-freely.org>
Date:	Mon, 7 Apr 2014 11:36:47 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Gerhard Sittig <gsi@...x.de>
Cc:	Yann Droneaud <ydroneaud@...eya.com>,
	Hans-Bernhard Bröker 
	<broeker@...rs.sourceforge.net>, linux-kernel@...r.kernel.org,
	Neil Horman <nhorman@...rs.sourceforge.net>,
	cscope-devel@...ts.sourceforge.net,
	Anton Blanchard <anton@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org,
	Hans-Bernhard Broeker <broeker@...sik.rwth-aachen.de>
Subject: Re: cscope: issue with symlinks in
 tools/testing/selftests/powerpc/copyloops/

On Mon, Apr 07, 2014 at 02:42:59PM +0200, Gerhard Sittig wrote:
> On Mon, 2014-04-07 at 06:42 -0400, Neil Horman wrote:
> > 
> > On Thu, Apr 03, 2014 at 03:16:15PM +0200, Yann Droneaud wrote:
> > > 
> > > [ ... ]
> > > 
> > > cscope reports error when generating the cross-reference database:
> > > 
> > >     $ make ALLSOURCE_ARCHS=all O=./obj-cscope/ cscope
> > >       GEN     cscope
> > >     cscope: cannot find
> > > file /home/ydroneaud/src/linux/tools/testing/selftests/powerpc/copyloops/copyuser_power7.S
> > >     cscope: cannot find
> > > file /home/ydroneaud/src/linux/tools/testing/selftests/powerpc/copyloops/memcpy_64.S
> > >     cscope: cannot find
> > > file /home/ydroneaud/src/linux/tools/testing/selftests/powerpc/copyloops/memcpy_power7.S
> > >     cscope: cannot find
> > > file /home/ydroneaud/src/linux/tools/testing/selftests/powerpc/copyloops/copyuser_64.S
> > > 
> > > And when calling cscope from ./obj-cscope/ directory, it reports errors
> > > too.
> > > 
> > > Hopefully it doesn't stop it from working, so I'm still able to use
> > > cscope to browse kernel sources.
> > > 
> > No, it won't stop it from working, it just won't search those files.  I don't
> > recall exactly the reason, but IIRC there was a big discussion long ago about
> > symlinks and our ability to support them (around version 1.94 I think).  We
> > decided to not handle symlinks, as they would either point outside our search
> > tree, which we didn't want to include, or would point to another file in the
> > search tree, which made loading them pointless (as we would cover the search in
> > the pointed file).
> 
> So there are valid reasons to not process those filesystem
> entries.  Would it be useful to not emit the warnings then?  Or
> to silent those warnings when the user knows it's perfectly legal
> to skip those filesytem entries?  Like what you can do with the
> ctags(1) command and its --links option.
> 
I would see no problem with an option to do that.  I'd like to make it opt-in,
so that people who want to know about symlink issues will still see them, but
I'd be supportive of an option to quiet them
Neil

> 
> virtually yours
> Gerhard Sittig
> -- 
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr. 5, D-82194 Groebenzell, Germany
> Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office@...x.de
> 
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