GNU bug report logs - #45375
cc-mode indentation sometimes doesn't work

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Herman, Géza <geza.herman <at> gmail.com>
Subject: bug#45375: closed (Re: bug#46400: bug#45375: cc-mode indentation
 sometimes doesn't work)
Date: Tue, 23 Feb 2021 11:33:02 +0000

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Your bug report

#45375: cc-mode indentation sometimes doesn't work

which was filed against the emacs,cc-mode package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 45375 <at> debbugs.gnu.org.

-- 
45375: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=45375
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Alan Mackenzie <acm <at> muc.de>
To: Herman <at> debbugs.gnu.org, Géza <geza.herman <at> gmail.com>
Cc: "Basil L. Contovounesios" <contovob <at> tcd.ie>, 45375-done <at> debbugs.gnu.org,
 46400-done <at> debbugs.gnu.org
Subject: Re: bug#46400: bug#45375: cc-mode indentation sometimes doesn't work
Date: Tue, 23 Feb 2021 11:32:00 +0000

Hello, Géza.

On Sun, Feb 14, 2021 at 11:11:28 +0000, Alan Mackenzie wrote:
> On Sat, Feb 13, 2021 at 19:43:31 +0100, Herman, Géza wrote:

[ .... ]

> In bug #46400, I think Konstantin's bisecting threw up the wrong commit,
> since cache bugs tend to be very slippery to pin down.

> > Thank you for looking at this!

> A pleasure!  I intend to commit the patch below in a few days time, if I
> don't hear back from anybody that it's giving trouble.  This patch fixes
> the bug when applied to that commit from December
> (9022df70270243f211c54ccd66800320148b8434).  It should apply cleanly to
> master.

I have now applied the patch to all the relevant places, and I am
closing the bugs with this post.

[ .... ]

> > Geza

-- 
Alan Mackenzie (Nuremberg, Germany).

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From: Herman, Géza <geza.herman <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: cc-mode indentation sometimes doesn't work
Date: Wed, 23 Dec 2020 00:02:17 +0100

On current master (6af31fd71ff1a403c199c479577bcc145a547db1) indentation 
of C/C++ files sometimes doesn't work. I've bisected it: commit 
"9022df7027 Optimise c-parse-state for large buffers with few (if any) 
braces." introduced this behavior.

This is how to reproduce: check out 
9022df70270243f211c54ccd66800320148b8434, and execute "emacs -Q 
xdisp.c". Jump to line 2989 with M-g M-g 2989, move the cursor to the 
end of line of "Lisp_Object retval;", and press enter. The cursor will 
be moved to the correct place (correctly indented, cursor will be placed 
below the 'L' character of the previous line). Then push enter at end of 
line of "va_list ap;". For me, cursor will jump to the beginning of the 
line, it won't be indented. If I keep pressing enters, the next failure 
will be at "va_end (ap);". I'm not sure whether this exact steps 
reproduces for everyone, but it happened me 5 of 5 trials. If I don't 
press enter at the first line ("Lisp_Object retval;"), the problem 
doesn't happen for any of this function lines. But it will happen for 
somewhere else, if I keep trying (move around the file, press enter at 
random places: if will fail sooner or later).

For my configuration (without -Q), this problem happens quite frequently 
during editing C++ code.

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