This must've happened during the last month or two. I'm not sure who's to blame for it, but now when I'm trying to byte-compile a mode derived from c-mode, Emacs can't find any of c-mode functions referenced in the derived mode.
I've looked into cc-bytecom.el and (I'm not sure if it is new, but looks like it is) it defines two macros: cc-requre and cc-provide. I can't really understand what they are doing, but they seem to prevent Emacs from finding out that these functions must be available. If, in my code, I try to substitute (requre 'cc-mode) to (cc-requre 'cc-mode) nothing changes.
The said macros only seem to apply to the compilation time, but I can't tell for sure, they also call (eval-when-compile (cc-bytecomp-restore-environment)) and (eval-when-compile (cc-bytecomp-load (symbol-name ,cc-part))). I'm having hard time figuring what does it do.
I don't see the problem you describe: when I compile the haxe-mode files, I just see a warning about several c-mode functions, saying that they may be undefined at runtime, because haxe-mode.el calls those functions but only loads the correspond files inside an eval-when-compile.
BTW, those warnings seem to be due to some weird code, probably copied from the infamous cc-bytecomp. The patch below seem to result in a clean compilation:
=== modified file 'haxe-help.el'
--- haxe-help.el 2012-10-16 14:41:06 +0000
+++ haxe-help.el 2012-10-16 15:11:37 +0000
@@ -33,7 +33,6 @@
;;; Code:
-(eval-when-compile (require 'cl))
(require 'cl)
(defcustom haxe-help-location
=== modified file 'haxe-mode.el'
--- haxe-mode.el 2012-10-16 14:41:06 +0000
+++ haxe-mode.el 2012-10-16 15:21:23 +0000
@@ -77,7 +77,6 @@
(require 'cc-bytecomp)
(require 'cc-mode)
(require 'cc-fonts)
-;; (cc-require-when-compile 'cc-langs)
(require 'cc-langs)
(require 'compile)
@@ -91,18 +90,6 @@
(require 'haxe-log)
;; ------------------- my change -------------------------------------
-;; The language constants are needed when compiling.
-(eval-when-compile
- (let ((load-path
- (if (and (boundp 'byte-compile-dest-file)
- (stringp byte-compile-dest-file))
- (cons (file-name-directory byte-compile-dest-file) load-path)
- load-path)))
- (load "cc-mode" nil t)
- (load "cc-fonts" nil t)
- (load "cc-langs" nil t)
- (load "cc-bytecomp" nil t)))
-
(eval-and-compile
;; Tell the language constant system about haXe and base it on Java.
(c-add-language 'haxe-mode 'java-mode))
@@ -387,7 +374,7 @@
(c-fontify-types-and-refs
((c-promote-possible-types t)
(parse-sexp-lookup-properties
- (cc-eval-when-compile
+ (eval-when-compile
(boundp 'parse-sexp-lookup-properties))))
(save-restriction
(narrow-to-region (point) limit)