Formerly cpp.texi.~30~

From-SVN: r13873

Formerly cpp.texi.~30~
From-SVN: r13873
977cc2e1 · Richard Kenner · e5bad25e · 977cc2e1
Commit 977cc2e1 authored 28 years ago by Richard Kenner
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gcc/cpp.texi
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--- 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