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I'm trying to get emacs (23.3 on Arch Linux) to map Ctrl+F12 to the built-in "compile" function when in C-mode (actually CC-mode, which comes built-in as well). So far I've tried the following:

(defun my-c-mode-common-hook (define-key c-mode-map (kbd "C-<f12>") 'compile))
(add-hook 'c-mode-common-hook 'my-c-mode-common-hook)

and:

(eval-after-load 'c-mode
  '(define-key c-mode-map (kbd "C-<f12>") 'compile))

But neither works; I get <C-f12> is undefined. Based on what I've read here, here, and here, I can't see why it isn't working. Any thoughts?

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I tried the fix I mentioned in my answer on an archlinux guest and I was unable to get C-F12 to work. However changing to just F12 did work. This may be a distro specific bug. Would love to hear if you get this working. –  vschum Aug 7 '11 at 23:50
    
@vschum: Using Gilles' version of the (eval-after-load) approach seems to work. –  Wolf Aug 8 '11 at 13:20

2 Answers 2

up vote 2 down vote accepted

C mode (and specifically the c-mode-map variable) is provided by a package called cc-mode, not c-mode.

(eval-after-load 'cc-mode
  '(define-key c-mode-map (kbd "C-<f12>") 'compile))

For your other method, as vschum has already answered, you're missing the argument list in your defun. Furthermore, c-mode-common-hook isn't the right place for this: it's executed each time you enter C mode. The right time to add your binding is when C mode loads; you can do that either through the general eval-after-load mechanism as above, or through c-initialization-hook:

(defun my-c-mode-common-hook ()
  (define-key c-mode-map (kbd "C-<f12>") 'compile))
(add-hook 'c-initialization-hook 'my-c-mode-common-hook)
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You've got a typo. You're missing the argument definition for the defun. In this case, since the function my-c-mode-common-hook doesn't take any argumentr, add an empty set of parens after the function name.

(defun my-c-mode-common-hook ()
    (define-key c-mode-map (kbd "C-<f12>") 'compile))
(add-hook 'c-mode-common-hook 'my-c-mode-common-hook)
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