:type 'c-extra-types-widget
:group 'c)
+(defvar c-noise-macro-with-parens-name-re "\\<\\>")
+(defvar c-noise-macro-name-re "\\<\\>")
+
+(defcustom c-noise-macro-names nil
+ "A list of names of macros which expand to nothing, or compiler extensions
+like \"????\" which are syntactic noise. Such a macro/extension is complete in
+itself, never having parentheses. All these names must be syntactically valid
+identifiers.
+
+If you change this variable's value, call the function
+`c-make-noise-macro-regexps' to set the necessary internal variables (or do
+this implicitly by reinitializing C/C++/Objc Mode on any buffer)."
+ :type '(repeat :tag "List of names" string)
+ :group 'c)
+(put 'c-noise-macro-names 'safe-local-variable #'c-string-list-p)
+
+(defcustom c-noise-macro-with-parens-names nil
+ "A list of names of macros \(or compiler extensions like \"__attribute__\")
+which optionally have arguments in parentheses, and which expand to nothing.
+These are recognized by CC Mode only in declarations."
+ :type '(regexp :tag "List of names (possibly empty)" string)
+ :group 'c)
+(put 'c-noise-macro-with-parens-names 'safe-local-variable #'c-string-list-p)
+
+(defun c-make-noise-macro-regexps ()
+ ;; Convert `c-noise-macro-names' and `c-noise-macro-with-parens-names' into
+ ;; `c-noise-macro-name-re' and `c-noise-macro-with-parens-name-re'.
+ (setq c-noise-macro-with-parens-name-re
+ (cond ((null c-noise-macro-with-parens-names) "\\<\\>")
+ ((consp c-noise-macro-with-parens-names)
+ (concat (regexp-opt c-noise-macro-with-parens-names t)
+ "\\([^[:alnum:]_$]\\|$\\)"))
+ ((stringp c-noise-macro-with-parens-names)
+ (copy-sequence c-noise-macro-with-parens-names))
+ (t (error "c-make-noise-macro-regexps: \
+c-noise-macro-with-parens-names is invalid: %s" c-noise-macro-with-parens-names))))
+ (setq c-noise-macro-name-re
+ (cond ((null c-noise-macro-names) "\\<\\>")
+ ((consp c-noise-macro-names)
+ (concat (regexp-opt c-noise-macro-names t)
+ "\\([^[:alnum:]_$]\\|$\\)"))
+ ((stringp c-noise-macro-names)
+ (copy-sequence c-noise-macro-names))
+ (t (error "c-make-noise-macro-regexps: \
+c-noise-macro-names is invalid: %s" c-noise-macro-names)))))
\f
;; Non-customizable variables, still part of the interface to CC Mode
+ ;; The following two are preparations for Emacs 25.2 (2016-05-09):
+ (put 'c-noise-macro-names 'safe-local-variable #'c-string-list-p)
+ (put 'c-noise-macro-with-parens-names 'safe-local-variable #'c-string-list-p)
+
(defvar c-macro-with-semi-re nil
;; Regular expression which matches a (#define'd) symbol whose expansion
;; ends with a semicolon.