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diff --git a/clang-tools-extra/modularize/Modularize.h b/clang-tools-extra/modularize/Modularize.h
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+++ b/clang-tools-extra/modularize/Modularize.h
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+//===--- Modularize.h - Common definitions for Modularize -*- C++ -*-----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===--------------------------------------------------------------------===//
+///
+/// \file
+/// \brief Common definitions for Modularize.
+///
+//===--------------------------------------------------------------------===//
+
+#ifndef MODULARIZE_H
+#define MODULARIZE_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include <string>
+#include <vector>
+
+// Save the program name for error messages.
+extern const char *Argv0;
+// Save the command line for comments.
+extern std::string CommandLine;
+
+// Dependency types.
+typedef llvm::SmallVector<std::string, 4> DependentsVector;
+typedef llvm::StringMap<DependentsVector> DependencyMap;
+
+// Global function declarations.
+
+/// Create the module map file.
+/// \param ModuleMapPath The path to the module map file to be generated.
+/// \param HeaderFileNames The list of header files, absolute native paths.
+/// \param Dependencies Map of headers that depend on other headers.
+/// \param HeaderPrefix Tells the code where the headers are, if they
+///   aren's in the current directory, allowing the generator to strip
+///   the leading, non-relative beginning of the header paths.
+/// \brief RootModuleName If not empty, specifies that a root module
+///   should be created with this name.
+/// \returns True if successful.
+bool createModuleMap(llvm::StringRef ModuleMapPath,
+                     llvm::ArrayRef<std::string> HeaderFileNames,
+                     DependencyMap &Dependencies, llvm::StringRef HeaderPrefix,
+                     llvm::StringRef RootModuleName);
+
+#endif // MODULARIZE_H