extend.texi (Strong Using): Warn users against using this feature.

	* doc/extend.texi (Strong Using): Warn users against using this
	feature.

From-SVN: r80826

gcc/ChangeLog

+2004-04-18  Mark Mitchell  <mark@codesourcery.com>
+
+	* doc/extend.texi (Strong Using): Warn users against using this
+	feature.
+
 2004-04-18  Richard Sandiford  <rsandifo@redhat.com>
 
 	* config/mips/mips-protos.h (m16_usym8_4, m16_usym5_4): Delete.

gcc/doc/extend.texi

@@ -8226,6 +8226,11 @@ See also @xref{Strong Using}.
 @node Strong Using
 @section Strong Using
 
+@strong{Caution:} The semantics of this extension are not fully
+defined.  Users should refrain from using this extension as its
+semantics may change subtly over time.  It is possible that this
+extension wil be removed in future versions of G++.
+
 A using-directive with @code{__attribute ((strong))} is stronger
 than a normal using-directive in two ways: