Formerly cpp.texi.~30~

From-SVN: r13873

diff --git a/gcc/cpp.texi b/gcc/cpp.texi
index c3164b97b02e062955efc9d575981be96c561584..b8961db8cde37bd42ee67c1ec498f6b0b9a9d01c 100644 (file)
--- a/gcc/cpp.texi
+++ b/gcc/cpp.texi
@@ -2630,13 +2630,17 @@ comment, or whenever a Backslash-Newline appears in a @samp{//} comment.
 @item -Wall
 @findex -Wall
 Requests both @samp{-Wtrigraphs} and @samp{-Wcomment} (but not
-@samp{-Wtraditional}). 
+@samp{-Wtraditional} or @samp{-Wundef}). 
 
 @item -Wtraditional
 @findex -Wtraditional
 Warn about certain constructs that behave differently in traditional and
 ANSI C@.
 
+@item -Wundef
+@findex -Wundef
+Warn if an undefined identifier is evaluated in an @samp{#if} directive.
+
 @item -I @var{directory}
 @findex -I
 Add the directory @var{directory} to the head of the list of