* mangle.c (write_type): Mangle decltype(auto).

From-SVN: r198150

gcc/cp/ChangeLog

+2013-04-22  Jason Merrill  <jason@redhat.com>
+
+	* mangle.c (write_type): Mangle decltype(auto).
+
 2013-04-19  Jason Merrill  <jason@redhat.com>
 
 	N3638 changes to return type deduction

gcc/cp/mangle.c

@@ -2019,7 +2019,10 @@ write_type (tree type)
 	    case TEMPLATE_TYPE_PARM:
 	      if (is_auto (type))
 		{
-		  write_identifier ("Da");
+		  if (AUTO_IS_DECLTYPE (type))
+		    write_identifier ("Dc");
+		  else
+		    write_identifier ("Da");
 		  ++is_builtin_type;
 		  break;
 		}

gcc/testsuite/g++.dg/cpp1y/auto-mangle1.C

+// Mangling for decltype(auto)
+// { dg-options "-std=c++1y" }
+
+void f();
+
+// { dg-final { scan-assembler "_Z2g1IiEDcv" } }
+template <class T> decltype(auto) g1() { return &f; }
+template decltype(auto) g1<int>();
+
+// { dg-final { scan-assembler "_Z2g2IiEDav" } }
+template <class T> auto g2() { return &f; }
+template auto g2<int>();