a bug in font lock for c++ code

a bug in font lock for c++ code

[zwz]

I find that my c++ code does not show in color after an update of emacs 
recently.

As far as I can figure out, the problem can be reproduced by:
(defun my-c-mode-common-hook()
 (font-lock-add-keywords nil
    '(("\\<\\(FIXME\\):" 1 font-lock-warning-face prepend)
      ("\\<\\(and\\|or\\|not\\)\\>" .
       font-lock-keyword-face))))
(add-hook 'c++-mode-hook 'my-c-mode-common-hook)

I am running GNU Emacs 24.0.50.1 (i386-mingw-nt6.0.6002) of 2010-05-21.

Re: a bug in font lock for c++ code

[Alan Mackenzie]

Hi, zwz,

Thanks for the bug report.

On Mon, Jun 14, 2010 at 03:15:40PM +0000, zwz wrote:
> I find that my c++ code does not show in color after an update of emacs 
> recently.

> As far as I can figure out, the problem can be reproduced by:
> (defun my-c-mode-common-hook()
>  (font-lock-add-keywords nil
>     '(("\\<\\(FIXME\\):" 1 font-lock-warning-face prepend)
>       ("\\<\\(and\\|or\\|not\\)\\>" .
>        font-lock-keyword-face))))
> (add-hook 'c++-mode-hook 'my-c-mode-common-hook)

> I am running GNU Emacs 24.0.50.1 (i386-mingw-nt6.0.6002) of 2010-05-21.

Any chance you could provide a sample (preferably small) of C++ code
where the fontification goes wrong?

-- 
Alan Mackenzie (Nuremberg, Germany).

Re: a bug in font lock for c++ code

[zwz]

Alan Mackenzie <acm@muc.de> writes:

> Hi, zwz,
>
> Thanks for the bug report.
>
> On Mon, Jun 14, 2010 at 03:15:40PM +0000, zwz wrote:
>> I find that my c++ code does not show in color after an update of
> emacs
>> recently.
>
>> As far as I can figure out, the problem can be reproduced by:
>> (defun my-c-mode-common-hook()
>>  (font-lock-add-keywords nil
>>     '(("\\<\\(FIXME\\):" 1 font-lock-warning-face prepend)
>>       ("\\<\\(and\\|or\\|not\\)\\>" .
>>        font-lock-keyword-face))))
>> (add-hook 'c++-mode-hook 'my-c-mode-common-hook)
>
>> I am running GNU Emacs 24.0.50.1 (i386-mingw-nt6.0.6002) of
> 2010-05-21.
>
> Any chance you could provide a sample (preferably small) of C++ code
> where the fontification goes wrong?
Yes. Here is what I do
1. start the emacs with "emacs -q"
2. eval the code described above
3. create a new buffer, say main.cpp (or any buffer with c++-mode enabled)
4. insert into the buffer:
int main()
{}
5. you should see that there is no color for the type "int" or the
   function name "main"