--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/DebugInfo/PDB/PDBSymbolUnknown.cpp	Wed Feb 18 14:55:36 2015 +0900
@@ -0,0 +1,23 @@
+//===- PDBSymbolUnknown.cpp - -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/PDBSymbolUnknown.h"
+
+#include "llvm/DebugInfo/PDB/PDBSymbol.h"
+
+#include <utility>
+
+using namespace llvm;
+
+PDBSymbolUnknown::PDBSymbolUnknown(const IPDBSession &PDBSession,
+                                   std::unique_ptr<IPDBRawSymbol> Symbol)
+    : PDBSymbol(PDBSession, std::move(Symbol)) {}
+
+void PDBSymbolUnknown::dump(raw_ostream &OS, int Indent,
+                            PDB_DumpLevel Level, PDB_DumpFlags Flags) const {}