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cwarn/font-lock problem under HP-UX 10.20

From: Klaus Zeitler
Subject: cwarn/font-lock problem under HP-UX 10.20
Date: Mon, 3 Dec 2001 16:19:04 +0100 (MET)

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In GNU Emacs 21.1.2 (hppa2.0-hp-hpux10.20, OSF/Motif Version 1.2.6)
 of 2001-11-29 on nbghs10
configured using `configure  --with-gcc 
--with-x-toolkit=motif --x-includes=/usr/include/X11R6:/usr/local/gnu/include 
--x-libraries=/usr/lib/X11R6:/usr/local/gnu/lib --with-pop'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C.iso88591
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

1. start emacs with -q
2. M-x: global-font-lock-mode
3. in scratch buffer execute (add-hook 'c-mode-hook 'turn-on-cwarn-mode)
4. load e.g. the following buggy C file:

1  main ()
2  {
3    int x=5;
4    if (x=1);
5    {
6    }
7  }

5. in line 4 the "=" and the ";" should be highlighted with
   font-lock-warning face, but they aren't

6. turn off cwarn-mode and turn it on again with twice
   M-x cwarn-mode
   now line 4 is correctly highlighted

When I execute the first 4 steps on my GNU/Linux PC line 4 is
correctly highlighted, but not under HP-UX. I'm puzzled, this
is the first time that syntax highlighting acts differently on
two OS. I have no idea how to investigate this further.

Recent input:
- f o n t - l o c k - m o SPC <return> M-: C-g ( a 
d d - h o o k SPC ' c - m o d e - h o o k SPC ' t u 
r n - o n - c w a r n - m o d e ) C-j C-x C-f t s t 
/ x . <backspace> <backspace> c w SPC c <return> <escape> 
x c w a r n - m SPC <return> <escape> x <up> <return> 
<help-echo> <help-echo> <down-mouse-1> <mouse-1> <help-echo> 
<help-echo> <menu-bar> <help-menu> <report-emacs-b

Recent messages:
Loading font-lock...done
Global-Font-Lock mode enabled
list: Quit
Loading cc-mode...done
Loading cwarn...done
Fontifying cwarn.c... (regexps..................)
Loading cwarn...done
Cwarn mode is now off.
Cwarn mode is now on.
Loading emacsbug...done

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