Fontify untyped function declarations in C Mode correctly.

Also correct two bugs where deleting WS at a BOL could leave an untyped
function declaration unfontified.

* lisp/progmodes/cc-engine.el (c-find-decl-spots): Don't set the flag
"top-level" when we're in a macro.
(c-forward-decl-or-cast-1): Recognize top-level "foo(bar)" or "foo()" in C
Mode as a implicitly typed function declaration.
(c-just-after-func-arglist-p): Don't get confused by "defined (foo)" inside a
macro.  It's not a function plus arglist.

* lisp/progmodes/cc-langs.el (c-cpp-expr-functions-key): New defconst and
defvar.

* lisp/progmodes/cc-mode.el (c-fl-decl-end): After c-forward-declarator, move
over any following parenthesis expression (i.e. parameter list).
(c-change-expand-fl-region): When c-new-END is at a BOL, include that line in
the returned region, to cope with deletions at column 0.

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 8867453e85c..b0e5fe47a7c 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -1571,6 +1571,8 @@ Note that this is a strict tail, so won't match, e.g. \"0x....\".")
 		   (and (c-beginning-of-macro)
 			(progn (c-end-of-macro) (point))))))
 	(when (and (c-forward-declarator lim)
+		   (or (not (eq (char-after) ?\())
+		       (c-go-list-forward nil lim))
 		   (eq (c-forward-token-2 1 nil lim) 0))
 	  (c-backward-syntactic-ws)
 	  (point))))))
@@ -1589,7 +1591,7 @@ Note that this is a strict tail, so won't match, e.g. \"0x....\".")
 	    (or (c-fl-decl-start c-new-BEG) (c-point 'bol c-new-BEG))
 	    c-new-END
 	    (or (c-fl-decl-end c-new-END)
-		(c-point 'bonl (max (1- c-new-END) (point-min)))))))
+		(c-point 'bonl c-new-END)))))
 
 (defun c-context-expand-fl-region (beg end)
   ;; Return a cons (NEW-BEG . NEW-END), where NEW-BEG is the beginning of a