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I have emacs 22.2.1. Is it safe, or even recommended, to update cc-mode to the latest?

+2  A: 

EDIT: Damyan's answer is much more informative.

No. The cc-mode the sourceforge project made its last release on February 2006, well before Emacs 22.2. Currently cc-mode is bundled with Emacs, so the only way to upgrade would be to take the related elisp sources from newer Emacs and backport them yourself.

Laurynas Biveinis
+2  A: 

See http://cc-mode.sourceforge.net/release.php for the cc-mode maintainer's position on this.

Damyan