bug#14167: 24.3; m4-mode uses word syntax for "_"

[Tom Tromey]

I noticed today that m4-mode uses word syntax for "_".
This makes forward-word et al act in a surprising way.
This patch seems to fix the problem for me, but I'm not sure if it has
other consequences.

=== modified file 'lisp/progmodes/m4-mode.el'
--- lisp/progmodes/m4-mode.el   2013-01-02 16:13:04 +0000
+++ lisp/progmodes/m4-mode.el   2013-04-09 16:06:09 +0000
@@ -95,7 +95,7 @@
 (modify-syntax-entry ?{  "_" m4-mode-syntax-table)
 (modify-syntax-entry ?}  "_" m4-mode-syntax-table)
 (modify-syntax-entry ?*  "w" m4-mode-syntax-table)
-(modify-syntax-entry ?_  "w" m4-mode-syntax-table)
+(modify-syntax-entry ?_  "_" m4-mode-syntax-table)
 (modify-syntax-entry ?\"  "w" m4-mode-syntax-table)
 (modify-syntax-entry ?\"  "w" m4-mode-syntax-table)
 




In GNU Emacs 24.3.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.6.4)
 of 2013-04-05 on barimba
Bzr revision: 111341 rgm@gnu.org-20130330165228-li5kficdh8tzr37k
Windowing system distributor `Fedora Project', version 11.0.11303000
Configured using:
 `configure '--prefix=/home/tromey/Space/EmacsBzr/emacs-mt/install''

Important settings:
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: m4

Minor modes in effect:
  global-auto-revert-mode: t
  shell-dirtrack-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-spelling-mode: t
  erc-truncate-mode: t
  diff-auto-refine-mode: t
  erc-status-mode: t
  erc-services-mode: t
  erc-networks-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
w e r e SPC C-l n o t SPC c o m p a t i b l e SPC w 
i t h SPC C + + 1 1 . <return> d n l <return> A C _ 
D M-/ ( [ g l <backspace> l i b c x x _ c h M-/ <M-backspace> 
<M-backspace> C-/ C-/ M-b M-b M-f C-u C-u C-f C-k s 
d M-/ C-h C-g ] C-x C-s C-z n C-x C-f C-g C-z n C-h 
m C-h f C-g <help-echo> <help-echo> <down-mouse-1> 
<mouse-2> <help-echo> C-x C-f C-g C-x 1 C-l C-SPC C-v 
C-u C-SPC M-v M-v C-v C-l C-u C-n C-s ? _ C-a C-f C-h 
f <return> C-z n C-x C-f C-a M-f M-f M-b M-r e m a 
c s <return> C-e <M-backspace> <M-backspace> <M-backspace> 
t r <tab> <M-backspace> e m <tab> C-g C-z n C-a C-SPC 
C-e M-w C-z n C-x b * s c r <tab> <return> M-> C-y 
M-b M-b M-b M-b M-b M-d _ C-e C-z o C-z o C-j C-z o 
C-x b <return> M-b M-b M-b C-z o C-z o C-x 1 C-l M-x 
r e p o r t C-g C-z n C-x C-f M-p M-r e m a c s <return> 
C-e <M-backspace> t r <tab> <M-backspace> <M-backspace> 
<M-backspace> t r <tab> e <backspace> <backspace> <tab> 
/ l i s <tab> p r o g <tab> m 4 <tab> <return> C-s 
? _ C-u C-p C-u C-p C-e M-b C-h f <return> C-h v s 
t a n d a r d - s y n <tab> C-g <help-echo> <down-mouse-1> 
<mouse-2> C-x 1 C-h C-g C-u C-n C-u C-n M-b M-b M-b 
M-b M-d _ C-x C-s C-z n M-x r e p o r t - e m <tab> 
<return>

Recent messages:
Type C-x 1 to delete the help window, C-M-v to scroll help.
Quit
Mark set [3 times]
Quit
Mark saved where search started
Type C-x 1 to delete the help window.
Quit

Saving file 
/home/tromey/Space/EmacsBzr/emacs-mt/trunk/lisp/progmodes/m4-mode.el...
Wrote /home/tromey/Space/EmacsBzr/emacs-mt/trunk/lisp/progmodes/m4-mode.el

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Features:
(shadow emacsbug m4-mode find-dired grep find-file find-func iswitchb
smerge-mode cal-move jimb-patch dired-aux autoconf autoconf-mode
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ange-ftp comint ansi-color ring server bbdb-autoloads time-date tooltip
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fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
register page menu-bar rfn-eshadow timer select scroll-bar mouse
jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

Tom