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+2015-01-13 Alan Mackenzie <acm@muc.de>
+
+ Allow compilation during loading of Modes derived from a CC Mode mode.
+ Fixes debbugs#19206.
+
+ * progmodes/cc-bytecomp.el (cc-bytecomp-compiling-or-loading): new
+ function which walks the stack to discover whether we're compiling
+ or loading.
+ (cc-bytecomp-is-compiling): Reformulate, and move towards
+ beginning.
+ (cc-bytecomp-is-loading): New defsubst.
+ (cc-bytecomp-setup-environment, cc-bytecomp-restore-environment):
+ Use the above defsubsts.
+ (cc-require-when-compile, cc-bytecomp-defvar)
+ (cc-bytecomp-defun): Simplify conditionals.
+
+ * progmodes/cc-defs.el (cc-bytecomp-compiling-or-loading):
+ "Borrow" this function from cc-bytecomp.el.
+ (c-get-current-file): Reformulate using the above.
+ (c-lang-defconst): Prevent duplicate entries of file names in a
+ symbol's 'source property.
+ (c-lang-const): Use cc-bytecomp-is-compiling.
+
+ * progmodes/cc-langs.el (c-make-init-lang-vars-fun): Use
+ cc-bytecomp-is-compiling.
+
2015-01-13 Stefan Monnier <monnier@iro.umontreal.ca>
* emacs-lisp/eieio-core.el (eieio-defclass): Fix call to `defclass'