re PR c++/58965 ([c++11] ICE with member initializer in static union)

	PR c++/58965
	* mangle.c (write_guarded_var_name): Handle null DECL_NAME.

From-SVN: r206405

gcc/cp/ChangeLog

+2014-01-07  Jason Merrill  <jason@redhat.com>
+
+	PR c++/58965
+	* mangle.c (write_guarded_var_name): Handle null DECL_NAME.
+
 2014-01-07  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* semantics.c (trait_expr_value, [CPTK_IS_BASE_OF]): Implement

gcc/cp/mangle.c

@@ -3775,7 +3775,8 @@ mangle_conv_op_name_for_type (const tree type)
 static void
 write_guarded_var_name (const tree variable)
 {
-  if (strncmp (IDENTIFIER_POINTER (DECL_NAME (variable)), "_ZGR", 4) == 0)
+  if (DECL_NAME (variable)
+      && strncmp (IDENTIFIER_POINTER (DECL_NAME (variable)), "_ZGR", 4) == 0)
     /* The name of a guard variable for a reference temporary should refer
        to the reference, not the temporary.  */
     write_string (IDENTIFIER_POINTER (DECL_NAME (variable)) + 4);

gcc/testsuite/g++.dg/cpp0x/nsdmi-union3.C

+// PR c++/58965
+// { dg-require-effective-target c++11 }
+
+void foo()
+{
+  static union
+  {
+    int i = i;
+  };
+}