invoke.texi (-Wreturn-type): In C++, a missing return type is always an error.

	* invoke.texi (-Wreturn-type): In C++, a missing return type is
	always an error.

From-SVN: r34813

gcc/ChangeLog

+2000-06-30  Martin von Loewis  <loewis@informatik.hu-berlin.de>
+
+	* invoke.texi (-Wreturn-type): In C++, a missing return type is
+	always an error.
+
 2000-06-30  Catherine Moore  <clm@cygnus.com>
  
         * c-common.c (decl_attributes):  Differentiate between

gcc/invoke.texi

@@ -1553,9 +1553,13 @@ the enclosing @code{if}.  The resulting code would look like this:
 @end smallexample
 
 @item -Wreturn-type
-Warn whenever a function is defined with a return-type that defaults
-to @code{int}.  Also warn about any @code{return} statement with no
-return-value in a function whose return-type is not @code{void}.
+Warn whenever a function is defined with a return-type that defaults to
+@code{int}.  Also warn about any @code{return} statement with no
+return-value in a function whose return-type is not @code{void}. 
+
+For C++, a function without return type always produces a diagnostic
+message, even when @samp{-Wno-return-type} is specified. The only
+exceptions are @samp{main} and functions defined in system headers.
 
 @item -Wswitch
 Warn whenever a @code{switch} statement has an index of enumeral type