bug#5600: 23.1; etags don't tag (defvar foo) declaration

[Kevin Ryde]

It'd be good if etags didn't tag defvar declaration forms, only actual
variable definitions.  For example it picks up

    (defvar message-indent-citation-function)

in longlines.el ahead of that variable's actual definition in
message.el, so M-. of that var goes to longlines.el first.

Perhaps something along the lines below.

I found the tripe-negative of while(!noninname) hard to follow and
thought a skip_name() could be clearer.  It might be shared by
Perl_functions, PHP_functions and Makefile_functions.

2010-02-18  Kevin Ryde  <user42@zip.com.au>

        * etags.c (Lisp_functions): Don't tag "(defvar foo)" declarations.
        (skip_name): New helper.

etags.c.defvar.diff
Description: Text Data

In GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.16.5)
 of 2009-09-14 on raven, modified by Debian
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' 
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' 
'--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim'
 '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g 
-O2' 'LDFLAGS=-g' 'CPPFLAGS=''