bug#7570: 24.0.50; cc-mode: c-file-style in .dir-locals.el was ignored

[Kan-Ru Chen]

Create .dir-locals.el with:

,----
| cat > .dir-locals.el <<HERE
| ((nil
|   (indent-tabs-mode . t))
|  (c-mode
|   (c-file-style . "linux")))
| HERE
`----

Then `C-x C-f test.c C-h v c-file-style' shows:

,----
| c-file-style is a variable defined in `cc-vars.el'.
| Its value is "linux"
| Local in buffer test.c; global value is nil
`----

But `C-h v c-basic-offset' still gives:

,----
| c-basic-offset is a variable defined in `cc-vars.el'.
| Its value is 2
| Original value was set-from-style
`----

I found the commit to `c-before-hack-hook' in Jul 18, 2010
added check against `dir-local-variables-alist' and "call `c-set-style'
differently according to whether c-file-style was set in file or
directory local variables."  Which is not clear why directory local
variables should be treated differently.

The following code from cc-mode.el:692

,----
| (if (boundp 'dir-local-variables-alist)
|     ;; Determine whether `c-file-style' was set in the file's local
|     ;; variables or in a .dir-locals.el (a directory setting).
|     (let ((cfs-in-file-and-dir-count
|            (c-count-cfss file-local-variables-alist))
|           (cfs-in-dir-count (c-count-cfss dir-local-variables-alist)))
|       (c-set-style stile
|                    (= cfs-in-file-and-dir-count cfs-in-dir-count)))
|   (c-set-style stile)))
`----

eventually calls (c-set-style "linux" t) if `c-file-style' was only set
in .dir-locals.el.  Since the style is set default to "gnu" and
DONT-OVERRIDE is t, most style from "linux" will not apply.



In GNU Emacs 24.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2010-12-05 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20101204-1)
configured using `configure  '--build' 'x86_64-linux-gnu' '--host' 
'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.0.50/site-lisp:/usr/share/emacs/site-lisp'
 '--without-compress-info' '--with-x=yes' '--with-x-toolkit=gtk' 
'--with-imagemagick=yes' 'build_alias=x86_64-linux-gnu' 
'host_alias=x86_64-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 
-g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

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: en_US.UTF-8
  value of $XMODIFIERS: @im=uim
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  eldoc-mode: t
  display-battery-mode: t
  cua-mode: t
  show-paren-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  paredit-mode: t
  yas/global-mode: t
  yas/minor-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
  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:
ESC [ > 0 ; 2 6 6 ; 0 c ESC ] 1 1 ; r g b : 0 0 0 0 
/ 0 0 0 0 / 0 0 0 0 ESC \ ESC x r e p o r t - e m a 
c s TAB RET

Recent messages:
uim.el: starting uim-el-helper-agent... done
uim.el: starting uim-el-agent... done
Loading /etc/emacs/site-start.d/50uim-el.el (source)...done
Loading /etc/emacs/site-start.d/50yasnippet.el (source)...done
Loading /etc/emacs/site-start.d/51debian-el.el (source)...done
Loading /home/kanru/.recentf...done
Cleaning up the recentf list...done (0 removed)
Ido mode enabled
Loading /home/kanru/.emacs.d/custom.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.

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/usr/share/emacs/24.0.50/lisp/gnus/nndraft
/home/kanru/src/mirror/gnus/lisp/nnspool hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnspool
/home/kanru/src/mirror/gnus/lisp/nnregistry hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnregistry
/home/kanru/src/mirror/gnus/lisp/score-mode hides 
/usr/share/emacs/24.0.50/lisp/gnus/score-mode
/home/kanru/src/mirror/gnus/lisp/nndoc hides 
/usr/share/emacs/24.0.50/lisp/gnus/nndoc
/home/kanru/src/mirror/gnus/lisp/compface hides 
/usr/share/emacs/24.0.50/lisp/gnus/compface
/home/kanru/src/mirror/gnus/lisp/nngateway hides 
/usr/share/emacs/24.0.50/lisp/gnus/nngateway
/home/kanru/src/mirror/gnus/lisp/qp hides /usr/share/emacs/24.0.50/lisp/gnus/qp
/home/kanru/src/mirror/gnus/lisp/nnbabyl hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnbabyl
/home/kanru/src/mirror/gnus/lisp/gnus-logic hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-logic
/home/kanru/src/mirror/gnus/lisp/gnus-html hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-html
/home/kanru/src/mirror/gnus/lisp/gnus-score hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-score
/home/kanru/src/mirror/gnus/lisp/spam-report hides 
/usr/share/emacs/24.0.50/lisp/gnus/spam-report
/home/kanru/src/mirror/gnus/lisp/legacy-gnus-agent hides 
/usr/share/emacs/24.0.50/lisp/gnus/legacy-gnus-agent
/home/kanru/src/mirror/gnus/lisp/mm-view hides 
/usr/share/emacs/24.0.50/lisp/gnus/mm-view
/home/kanru/src/mirror/gnus/lisp/auth-source hides 
/usr/share/emacs/24.0.50/lisp/gnus/auth-source
/home/kanru/src/mirror/gnus/lisp/gnus-bookmark hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-bookmark
/home/kanru/src/mirror/gnus/lisp/gnus-diary hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-diary
/home/kanru/src/mirror/gnus/lisp/rfc2231 hides 
/usr/share/emacs/24.0.50/lisp/gnus/rfc2231
/home/kanru/src/mirror/gnus/lisp/nnvirtual hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnvirtual
/home/kanru/src/mirror/gnus/lisp/sieve hides 
/usr/share/emacs/24.0.50/lisp/gnus/sieve
/home/kanru/src/mirror/gnus/lisp/gnus-agent hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-agent
/home/kanru/src/mirror/gnus/lisp/gnus-fun hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-fun
/home/kanru/src/mirror/gnus/lisp/nntp hides 
/usr/share/emacs/24.0.50/lisp/gnus/nntp
/home/kanru/src/mirror/gnus/lisp/gmm-utils hides 
/usr/share/emacs/24.0.50/lisp/gnus/gmm-utils
/home/kanru/src/mirror/gnus/lisp/spam hides 
/usr/share/emacs/24.0.50/lisp/gnus/spam
/home/kanru/src/mirror/gnus/lisp/gnus-uu hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-uu
/home/kanru/src/mirror/gnus/lisp/mm-util hides 
/usr/share/emacs/24.0.50/lisp/gnus/mm-util
/home/kanru/src/mirror/gnus/lisp/nnml hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnml
/home/kanru/src/mirror/gnus/lisp/gnus-mlspl hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-mlspl
/home/kanru/src/mirror/gnus/lisp/mml hides 
/usr/share/emacs/24.0.50/lisp/gnus/mml
/home/kanru/src/mirror/gnus/lisp/mail-source hides 
/usr/share/emacs/24.0.50/lisp/gnus/mail-source
/home/kanru/src/mirror/gnus/lisp/nnmairix hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnmairix
/home/kanru/src/mirror/gnus/lisp/utf7 hides 
/usr/share/emacs/24.0.50/lisp/gnus/utf7
/home/kanru/src/mirror/gnus/lisp/nnmaildir hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnmaildir
/home/kanru/src/mirror/gnus/lisp/smiley hides 
/usr/share/emacs/24.0.50/lisp/gnus/smiley
/home/kanru/src/mirror/gnus/lisp/nnmbox hides 
/usr/share/emacs/24.0.50/lisp/gnus/nnmbox
/home/kanru/src/mirror/gnus/lisp/gnus-cache hides 
/usr/share/emacs/24.0.50/lisp/gnus/gnus-cache
/home/kanru/src/mirror/gnus/lisp/.dir-locals hides 
/usr/share/emacs/24.0.50/lisp/gnus/.dir-locals
/home/kanru/src/mirror/gnus/lisp/shr-color hides 
/usr/share/emacs/24.0.50/lisp/gnus/shr-color
/home/kanru/src/mirror/gnus/lisp/time-date hides 
/usr/share/emacs/24.0.50/lisp/calendar/time-date
/home/kanru/src/mirror/gnus/lisp/parse-time hides 
/usr/share/emacs/24.0.50/lisp/calendar/parse-time

Features:
(shadow sort flyspell ispell mail-extr message sendmail rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
emacsbug eldoc uuid calc-misc sha1 hex-util calc-ext calc calc-loaddefs
calc-macs my-bbdb bbdb timezone my-misc openwith battery cua-base
my-bindings byte-opt warnings bytecomp byte-compile starter-kit-lisp
starter-kit-misc ido paren tramp-cache tramp-sh shell comint ring tramp
regexp-opt tramp-compat auth-source netrc gnus-util password-cache
format-spec tramp-loaddefs recentf tree-widget wid-edit ansi-color
china-util starter-kit-bindings windmove starter-kit-defuns imenu
thingatpt paredit uniquify saveplace info gnus-load debian-el
debian-el-loaddefs yasnippet derived edmacro kmacro easymenu assoc cl
uim-leim uim advice help-fns advice-preload uim-helper uim-candidate
uim-preedit uim-key uim-util uim-debug uim-keymap uim-var uim-version
slime-autoloads muse-autoloads emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode dpkg-dev-el dpkg-dev-el-loaddefs
bbdb-autoloads tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win
x-dnd tool-bar dnd fontset image fringe 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 loaddefs button minibuffer faces
cus-face files text-properties overlay md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)