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diff --git a/clang-r353983e/include/clang/Basic/MacroBuilder.h b/clang-r353983e/include/clang/Basic/MacroBuilder.h
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+++ b/clang-r353983e/include/clang/Basic/MacroBuilder.h
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+//===--- MacroBuilder.h - CPP Macro building utility ------------*- 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
+/// Defines the clang::MacroBuilder utility class.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_MACROBUILDER_H
+#define LLVM_CLANG_BASIC_MACROBUILDER_H
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace clang {
+
+class MacroBuilder {
+  raw_ostream &Out;
+public:
+  MacroBuilder(raw_ostream &Output) : Out(Output) {}
+
+  /// Append a \#define line for macro of the form "\#define Name Value\n".
+  void defineMacro(const Twine &Name, const Twine &Value = "1") {
+    Out << "#define " << Name << ' ' << Value << '\n';
+  }
+
+  /// Append a \#undef line for Name.  Name should be of the form XXX
+  /// and we emit "\#undef XXX".
+  void undefineMacro(const Twine &Name) {
+    Out << "#undef " << Name << '\n';
+  }
+
+  /// Directly append Str and a newline to the underlying buffer.
+  void append(const Twine &Str) {
+    Out << Str << '\n';
+  }
+};
+
+}  // end namespace clang
+
+#endif