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

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Message-ID: <20140408075610.GJ11339@book.gsilab.sittig.org>
Date:	Tue, 8 Apr 2014 09:56:10 +0200
From:	Gerhard Sittig <gsi@...x.de>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Yann Droneaud <ydroneaud@...eya.com>,
	Hans-Bernhard Bröker 
	<broeker@...rs.sourceforge.net>, linux-kernel@...r.kernel.org,
	Neil Horman <nhorman@...rs.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/

[ removed cscope-devel from Cc:, non-subscriber mails get blocked anyway ]

On Mon, 2014-04-07 at 14:42 +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.

For the record:  I got a response "off list" (actually to the
cscope list only which is closed for non-subscribers, while the
Linux related recipients were removed despite the fact that the
issue appears to be in Linux), see
http://article.gmane.org/gmane.comp.programming.tools.cscope.devel/105

This reponse suggests that the issue is not in cscope(1) itself,
but instead is in how the cscope(1) command got invoked.  Which
translates into "the Linux infrastructure does something wrong".

A quick search identifies ./scripts/tags.sh:all_target_sources()
as the spot where symlinks should get filtered out.  Where both
paths of all_target_sources() end up calling all_sources().


virtually yours
Gerhard Sittig
-- 
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