--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/lib/Lex/PPCallbacks.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,13 @@
+//===--- PPCallbacks.cpp - Callbacks for Preprocessor actions ---*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Lex/PPCallbacks.h"
+
+using namespace clang;
+
+void PPChainedCallbacks::anchor() { }