bug#18072: 24.3; cc-mode indentation is broken

[Juhani Åhman]

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org. Please check that
the From: line contains a valid email address. After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug. If you can, give a recipe
starting from `emacs -Q':

I can't reliably reproduce the bug.
All I can say that the auto-indentation thingymajig in cc-mode stops working at
random every 5-15 minutes or so.
I can get it working again by reloading the file I am editing.
When the indentation is broken, pressing enter will leave no indentation
space for braces and such.

it looks like this

if(1) {
foo();
bar();
zot();
}

when it should look like this

if(1) {
    foo();
    bar();
    zot();
}

I'm pretty sure the indentation was working in some previous version,
about two years ago or so, but not in any of the newer versions of Emacs.


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
`bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.3/etc/DEBUG.


In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.12.2)
of 2014-06-11 on var-lib-archbuild-staging-x86_64-jgc
Windowing system distributor `The X.Org Foundation', version 11.0.11502000
Configured using:
`configure '--prefix=/usr' '--sysconfdir=/etc' '--libexecdir=/usr/lib'
'--localstatedir=/var' '--with-x-toolkit=gtk3' '--with-xft'
'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
--param=ssp-buffer-size=4'
'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
value of $LC_COLLATE: fi_FI.UTF-8
value of $LC_CTYPE: fi_FI.UTF-8
value of $LC_MESSAGES: en_US.UTF-8
value of $LC_MONETARY: fi_FI.UTF-8
value of $LC_NUMERIC: en_US.UTF-8
value of $LC_TIME: en_DK.UTF-8
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
electric-indent-mode: t
cua-mode: t
global-subword-mode: t
subword-mode: t
show-paren-mode: t
global-hl-line-mode: t
tooltip-mode: t
mouse-wheel-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
column-number-mode: t
line-number-mode: t
transient-mark-mode: t

Recent input:
M-x c o - m
C-a C-k C-g M-x r e o
p e p o
r

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading /home/fzzy/.emacs.d/session.10ded9d363000140534073900000004430047...done
Restored session data
Making completion list... [3 times]
Quit
Making completion list... [2 times]

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message idna 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 mail-prsvr mail-utils help-mode easymenu electric preview-latex
tex-site auto-loads cc-styles cc-align cc-engine cc-vars cc-defs
bison-mode-autoloads glsl-mode-autoloads go-mode-autoloads package
cua-base subword bs paren edmacro kmacro hl-line delsel server time-date
tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar
dnd 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)