re PR c++/27820 (ICE with duplicate label)

	PR c++/27820
	* decl.c (define_label): Return error_mark_node on error.
	* semantics.c (finish_label_stmt): Don't call
	add_stmt for invalid labels.

	* g++.dg/other/label1.C: New test.


Co-Authored-By: Andrew Pinski <pinskia@gmail.com>

From-SVN: r115265

gcc/cp/ChangeLog

+2006-06-29  Lee Millward  <lee.millward@gmail.com>
+	    Andrew Pinski  <pinskia@gmail.com>
+
+	PR c++/27820
+	* decl.c (define_label): Return error_mark_node on error.
+	* semantics.c (finish_label_stmt): Don't call
+	add_stmt for invalid labels.
+	
 2006-07-06  Jason Merrill  <jason@redhat.com>
 
 	PR c++/28279

gcc/cp/decl.c

@@ -2543,7 +2543,10 @@ define_label (location_t location, tree name)
     pedwarn ("label named wchar_t");
 
   if (DECL_INITIAL (decl) != NULL_TREE)
-    error ("duplicate label %qD", decl);
+    {
+      error ("duplicate label %qD", decl);
+      POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
+    }
   else
     {
       struct named_label_use_entry *use;

gcc/cp/semantics.c

@@ -1293,6 +1293,10 @@ tree
 finish_label_stmt (tree name)
 {
   tree decl = define_label (input_location, name);
+
+  if (decl  == error_mark_node)
+    return error_mark_node;
+
   return add_stmt (build_stmt (LABEL_EXPR, decl));
 }
 

gcc/testsuite/ChangeLog

+2006-07-07  Lee Millward  <lee.millward@gmail.com>
+
+	PR c++/27820
+	* g++.dg/other/label1.C: New test.
+	
 2006-07-07   Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/28268

gcc/testsuite/g++.dg/other/label1.C

+//PR c++/27820
+
+void foo()
+{
+    L: L: ; // { dg-error "duplicate label" }
+}
+