re PR debug/58315 (Excessive memory use with -g)

	PR debug/58315
	* decl.c (start_preparsed_function): Use create_artificial_label
	for cdtor_label.

From-SVN: r220974

gcc/cp/ChangeLog

+2015-02-25  Jason Merrill  <jason@redhat.com>
+
+	PR debug/58315
+	* decl.c (start_preparsed_function): Use create_artificial_label
+	for cdtor_label.
+
 2015-02-17  Paolo Carlini  <paolo.carlini@oracle.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/cp/decl.c

@@ -13721,9 +13721,7 @@ start_preparsed_function (tree decl1, tree attrs, int flags)
       || (DECL_CONSTRUCTOR_P (decl1)
 	  && targetm.cxx.cdtor_returns_this ()))
     {
-      cdtor_label = build_decl (input_location, 
-				LABEL_DECL, NULL_TREE, void_type_node);
-      DECL_CONTEXT (cdtor_label) = current_function_decl;
+      cdtor_label = create_artificial_label (input_location);
     }
 
   start_fname_decls ();

gcc/testsuite/g++.dg/tree-ssa/deleted-label1.C

+// PR debug/58315
+// { dg-options "-O -g -fdump-tree-einline" }
+// { dg-final { scan-tree-dump-not "DEBUG <L0>" "einline" } }
+// { dg-final { cleanup-tree-dump "einline" } }
+
+// We used to emit useless NOTE_INSN_DELETED_DEBUG_LABELs for the
+// artificial cdtor_label.
+
+struct A
+{
+  ~A() {}
+};
+
+struct B: A {};
+
+int main()
+{
+  A a;
+}