(Limitations and Known Bugs): State that the number of parens/brackets in

a k&r region is limited.

2 files changed, 13 insertions, 0 deletions

diff --git a/doc/misc/cc-mode.texi b/doc/misc/cc-mode.texi
index 8ac9588c305..0bbe639e6db 100644
--- a/doc/misc/cc-mode.texi
+++ b/doc/misc/cc-mode.texi
@@ -6760,6 +6760,14 @@ templates do not fare so well.  Sometimes a workaround is to refontify
 the expression after typing the closing @samp{>}.
 
 @item
+In a @dfn{k&r region} (the part of an old-fashioned C function
+declaration which specifies the types of its parameters, coming
+between the parameter list and the opening brace), there should be at
+most 20 top-level parenthesis and bracket pairs.  This limit has been
+imposed for performance reasons.  If it is violated, the source file
+might be incorrectly indented or fontified.
+
+@item
 On loading @ccmode{}, sometimes this error message appears:
 
 @example
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d162ea33fb1..9d267a7d863 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2008-03-07  Alan Mackenzie  <acm@muc.de>
+
+        * progmodes/cc-engine.el (c-in-knr-argdecl): Limit number of
+        paren/bracket pairs parsed, to solve performance problem.
+
 2008-03-07  Bastien Guerry  <bzg@altern.org>
 
         * bookmark.el (bookmark-set): Don't check for