linux-kernel - Re: [PATCH] kbuild: incremental tags updating with GNU GLOBAL

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Message-ID: <20110725132040.GE4482@sepie.suse.cz>
Date:	Mon, 25 Jul 2011 15:20:40 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Víctor M. Jáquez L. <vjaquez@...lia.com>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	Jianbin Kang <kjbmail@...il.com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] kbuild: incremental tags updating with GNU GLOBAL

On Mon, Jul 11, 2011 at 03:17:25PM +0200, Víctor M. Jáquez L. wrote:
> On Mon, Jul 11, 2011 at 02:17:38PM +0200, Michal Marek wrote:
> > On 11.7.2011 12:26, Víctor Manuel Jáquez Leal wrote:
> > >Instead of generating the tag database each time the target is ran, is better
> > >just update incrementally the database. It will expend less time.
> > >
> > >Signed-off-by: Víctor Manuel Jáquez Leal<vjaquez@...lia.com>
> > >---
> > >  scripts/tags.sh |    6 +++++-
> > >  1 files changed, 5 insertions(+), 1 deletions(-)
> > >
> > >diff --git a/scripts/tags.sh b/scripts/tags.sh
> > >index 75c5d24..6a2fedc 100755
> > >--- a/scripts/tags.sh
> > >+++ b/scripts/tags.sh
> > >@@ -116,7 +116,11 @@ docscope()
> > >
> > >  dogtags()
> > >  {
> > >-	all_sources | gtags -f -
> > >+	if global -p; then
> > >+		global -u
> > >+	else
> > >+		all_sources | gtags -f -
> > >+	fi
> > 
> > Will this handle new source files properly?
> 
> I ran a quick test and yes, it does.

I installed global and tried it myself:
1) The first 'make gtags' run prints a rather confusing message (fixable)
 $ make gtags
   GEN     gtags
   global: GTAGS not found.
 $
2) A second run indexes the _whole_ tree, including everything under
arch/. The point of the tags.sh script is that it indexes only files
relevant to the current architecture. If someone wants to index the
whole tree, they can run global directly.

Michal
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