--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/MCA/HardwareUnits/HardwareUnit.cpp	Wed Aug 14 19:46:37 2019 +0900
@@ -0,0 +1,24 @@
+//===------------------------- HardwareUnit.cpp -----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// This file defines the anchor for the base class that describes
+/// simulated hardware units.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MCA/HardwareUnits/HardwareUnit.h"
+
+namespace llvm {
+namespace mca {
+
+// Pin the vtable with this method.
+HardwareUnit::~HardwareUnit() = default;
+
+} // namespace mca
+} // namespace llvm