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diff --git a/clang-r344140b/include/clang/Lex/ExternalPreprocessorSource.h b/clang-r344140b/include/clang/Lex/ExternalPreprocessorSource.h
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+++ b/clang-r344140b/include/clang/Lex/ExternalPreprocessorSource.h
@@ -0,0 +1,48 @@
+//===- ExternalPreprocessorSource.h - Abstract Macro Interface --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the ExternalPreprocessorSource interface, which enables
+//  construction of macro definitions from some external source.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_LEX_EXTERNALPREPROCESSORSOURCE_H
+#define LLVM_CLANG_LEX_EXTERNALPREPROCESSORSOURCE_H
+
+namespace clang {
+
+class IdentifierInfo;
+class Module;
+
+/// Abstract interface for external sources of preprocessor
+/// information.
+///
+/// This abstract class allows an external sources (such as the \c ASTReader)
+/// to provide additional preprocessing information.
+class ExternalPreprocessorSource {
+public:
+  virtual ~ExternalPreprocessorSource();
+
+  /// Read the set of macros defined by this external macro source.
+  virtual void ReadDefinedMacros() = 0;
+
+  /// Update an out-of-date identifier.
+  virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0;
+
+  /// Return the identifier associated with the given ID number.
+  ///
+  /// The ID 0 is associated with the NULL identifier.
+  virtual IdentifierInfo *GetIdentifier(unsigned ID) = 0;
+
+  /// Map a module ID to a module.
+  virtual Module *getModule(unsigned ModuleID) = 0;
+};
+
+}
+
+#endif