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bug#20629: 25.0.50; Regression: TAGS broken, can't find anything in C++

From: Jan Djärv
Subject: bug#20629: 25.0.50; Regression: TAGS broken, can't find anything in C++ files.
Date: Sat, 23 May 2015 13:54:55 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

This is the bad commit:

commit c7d601adefe130b773c1622a5aa8722d80709c1c
Author: Dmitry Gutov <address@hidden>
Date:   Sun May 10 00:36:46 2015 +0300

    Remove tag-symbol-match-p from etags-xref-find-definitions-tag-order

    * lisp/progmodes/etags.el (etags-xref-find-definitions-tag-order):
    Remove tag-symbol-match-p from the default value

The URL given in the description doesn't actually say why this change was made. It just asks if anyone has objections.
So if there is no justification for this change, I will revert it soonish.
C++ support in Emacs is kind of a big deal.

        Jan D.

Den 2015-05-22 07:57, Jan D. skrev:

Create this file as x.cc
class XX
     int foo();
     void bar();

     return 1;


main(int argc, char *argv[])
     XX xx;
     return 0;


Run etags on it:

% etags x.cc

In emacs, load the TAGS file, put the cursor on bar in xx.bar in main and
press ESC .
Emacs says: "No known definitions for: bar".
Put cursor on foo in foo(); in XX::bar(), press ESC .
Emacs says: "No known definitions for: foo".

If you do the same thing in 24.5, it works as expected, i.e. the cursor
jumps to respective member definition.
The TAGS file produced by trunk etags and 24.5 etags are exactly the same.

This regression makes the etags feature totally useless for C++.

      Jan D.

In GNU Emacs (x86_64-apple-darwin14.3.0, NS appkit-1347.57 Version
10.10.3 (Build 14D136))
  of 2015-05-22 on <anon>
Windowing system distributor `Apple', version 10.3.1347
Configured using:
  `configure --enable-checking --verbose --with-ns --without-x CFLAGS=-g'

Configured features:

Important settings:
   value of $LC_COLLATE: C
   value of $LANG: sv_SE.UTF-8
   locale-coding-system: utf-8-unix

Major mode: C++/l

Minor modes in effect:
   tooltip-mode: t
   global-eldoc-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   tool-bar-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   line-number-mode: t
   abbrev-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Starting a new list of tags tables
user-error: No known definitions for: bar
user-error: No known definitions for: foo

Load-path shadows:
None found.

(shadow sort gnus-util mail-extr emacsbug message dired format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils etags thingatpt xref cl-seq ring
eieio byte-opt gv bytecomp byte-compile cl-extra seq cconv eieio-core
cl-loaddefs pcase cl-lib cc-mode cc-fonts easymenu cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel ns-win term/common-win tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
cocoa ns multi-tty make-network-process emacs)

Memory information:
((conses 16 107206 5916)
  (symbols 48 21504 1)
  (miscs 40 49 143)
  (strings 32 21487 4677)
  (string-bytes 1 738790)
  (vectors 16 15321)
  (vector-slots 8 438795 3143)
  (floats 8 151 24)
  (intervals 56 245 4)
  (buffers 976 13))

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