* progmodes/cc-langs.el (c-emacs-variable-inits): new variable.

(c-lang-setvar): new macro.
(c-make-init-lang-vars-fun): Use the initialization forms in
c-emacs-variable-inits in addition to those in c-lang-variable-inits.
(comment-start, comment-end, comment-start-skip): Change these from
c-lang-defvar's to c-lang-setvar's.

* progmodes/cc-mode.el (c-make-emacs-variables-local): new macro,
which calls make-local-variable on the elements of
c-emacs-variable-inits.
(c-init-language-vars-for): Call this new macro.

1 files changed, 9 insertions, 0 deletions

diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 7343ec735e..eb5ae4b63b 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -153,12 +153,21 @@
 (defun c-leave-cc-mode-mode ()
   (setq c-buffer-is-cc-mode nil))
 
+;; Make the `c-lang-setvar' variables buffer local in the current buffer.
+;; These are typically standard emacs variables such as `comment-start'.
+(defmacro c-make-emacs-variables-local ()
+  `(progn
+     ,@(mapcan (lambda (init)
+		 `((make-local-variable ',(car init))))
+	       (cdr c-emacs-variable-inits))))
+
 (defun c-init-language-vars-for (mode)
   "Initialize the language variables for one of the language modes
 directly supported by CC Mode.  This can be used instead of the
 `c-init-language-vars' macro if the language you want to use is one of
 those, rather than a derived language defined through the language
 variable system (see \"cc-langs.el\")."
+  (c-make-emacs-variables-local)
   (cond ((eq mode 'c-mode)    (c-init-language-vars c-mode))
 	((eq mode 'c++-mode)  (c-init-language-vars c++-mode))
 	((eq mode 'objc-mode) (c-init-language-vars objc-mode))