gxxint.texi: G++ now implements namespaces.

	* gxxint.texi: G++ now implements namespaces.

	* decl.c (pop_label): Don't warn about unused labels more than
	once.
	* semantics.c (finish_goto_stmt): Always marked used labels as
	used.

From-SVN: r29505

gcc/cp/ChangeLog

+1999-09-18  Paul Burchard <burchard@pobox.com>
+
+	* gxxint.texi: G++ now implements namespaces.
+	
 1999-09-18  Mark Mitchell  <mark@codesourcery.com>
 
+	* decl.c (pop_label): Don't warn about unused labels more than
+	once.
+	* semantics.c (finish_goto_stmt): Always marked used labels as
+	used.
+
 	* decl.c (layout_var_decl): Change prototype.  Call layout_decl
 	even when the declaration is external.
 	(cp_finish_decl): Adjust call to layout_var_decl.

gcc/cp/decl.c

@@ -1125,14 +1125,17 @@ pop_label (link)
 {
   tree label = TREE_VALUE (link);
 
-  if (DECL_INITIAL (label) == NULL_TREE)
+  if (!processing_template_decl && doing_semantic_analysis_p ())
     {
-      cp_error_at ("label `%D' used but not defined", label);
-      /* Avoid crashing later.  */
-      define_label (input_filename, 1, DECL_NAME (label));
+      if (DECL_INITIAL (label) == NULL_TREE)
+	{
+	  cp_error_at ("label `%D' used but not defined", label);
+	  /* Avoid crashing later.  */
+	  define_label (input_filename, 1, DECL_NAME (label));
+	}
+      else if (warn_unused && !TREE_USED (label))
+	cp_warning_at ("label `%D' defined but not used", label);
     }
-  else if (warn_unused && !TREE_USED (label))
-    cp_warning_at ("label `%D' defined but not used", label);
 
   SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), TREE_PURPOSE (link));
 }

gcc/cp/gxxint.texi

@@ -1602,7 +1602,7 @@ The int parameter is a basic type, and does not receive a B encoding...
 @subsection Qualified names
 
 Both C++ and Java allow a class to be lexically nested inside another
-class.  C++ also supports namespaces (not yet implemented by G++).
+class.  C++ also supports namespaces.
 Java also supports packages.
 
 These are all mangled the same way:  First the letter @samp{Q}

gcc/cp/semantics.c

@@ -642,6 +642,11 @@ finish_goto_stmt (destination)
   if (TREE_CODE (destination) == IDENTIFIER_NODE)
     destination = lookup_label (destination);
 
+  /* We warn about unused labels with -Wunused.  That means we have to
+     mark the used labels as used.  */
+  if (TREE_CODE (destination) == LABEL_DECL)
+    TREE_USED (destination) = 1;
+    
   if (building_stmt_tree ())
     add_tree (build_min_nt (GOTO_STMT, destination));
   else
@@ -650,7 +655,6 @@ finish_goto_stmt (destination)
 
       if (TREE_CODE (destination) == LABEL_DECL)
 	{
-	  TREE_USED (destination) = 1;
 	  label_rtx (destination);
 	  expand_goto (destination); 
 	}

gcc/testsuite/g++.old-deja/g++.pt/warn2.C

+// Build don't link:
+// Special g++ Options: -Wall
+// Origin: Jeroen@MMR.be
+
+template <typename T>
+void f()
+{
+  for(;;)
+    for(;;)
+      goto a;
+
+ a:
+  ;
+}
+
+void g()
+{
+  f<long>();
+}