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diff --git a/include/clang/Basic/VersionTuple.h b/include/clang/Basic/VersionTuple.h
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+//===- VersionTuple.h - Version Number Handling -----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines the VersionTuple class, which represents a version in
+// the form major[.minor[.subminor]].
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_BASIC_VERSIONTUPLE_H
+#define LLVM_CLANG_BASIC_VERSIONTUPLE_H
+
+#include "llvm/ADT/Optional.h"
+#include <string>
+
+namespace llvm {
+  class raw_ostream;
+}
+
+namespace clang {
+
+/// \brief Represents a version number in the form major[.minor[.subminor]].
+class VersionTuple {
+  unsigned Major;
+  unsigned Minor : 31;
+  unsigned Subminor : 31;
+  unsigned HasMinor : 1;
+  unsigned HasSubminor : 1;
+
+public:
+  VersionTuple() 
+    : Major(0), Minor(0), Subminor(0), HasMinor(false), HasSubminor(false) { }
+
+  explicit VersionTuple(unsigned Major)
+    : Major(Major), Minor(0), Subminor(0), HasMinor(false), HasSubminor(false)
+  { }
+
+  explicit VersionTuple(unsigned Major, unsigned Minor)
+    : Major(Major), Minor(Minor), Subminor(0), HasMinor(true), 
+      HasSubminor(false)
+  { }
+
+  explicit VersionTuple(unsigned Major, unsigned Minor, unsigned Subminor)
+    : Major(Major), Minor(Minor), Subminor(Subminor), HasMinor(true), 
+      HasSubminor(true)
+  { }
+
+  /// \brief Determine whether this version information is empty
+  /// (e.g., all version components are zero).
+  bool empty() const { return Major == 0 && Minor == 0 && Subminor == 0; }
+
+  /// \brief Retrieve the major version number.
+  unsigned getMajor() const { return Major; }
+
+  /// \brief Retrieve the minor version number, if provided.
+  llvm::Optional<unsigned> getMinor() const { 
+    if (!HasMinor)
+      return llvm::Optional<unsigned>();
+    return Minor;
+  }
+
+  /// \brief Retrieve the subminor version number, if provided.
+  llvm::Optional<unsigned> getSubminor() const { 
+    if (!HasSubminor)
+      return llvm::Optional<unsigned>();
+    return Subminor;
+  }
+
+  /// \brief Determine if two version numbers are equivalent. If not
+  /// provided, minor and subminor version numbers are considered to be zero.
+  friend bool operator==(const VersionTuple& X, const VersionTuple &Y) {
+    return X.Major == Y.Major && X.Minor == Y.Minor && X.Subminor == Y.Subminor;
+  }
+
+  /// \brief Determine if two version numbers are not equivalent. If
+  /// not provided, minor and subminor version numbers are considered to be 
+  /// zero.
+  friend bool operator!=(const VersionTuple &X, const VersionTuple &Y) {
+    return !(X == Y);
+  }
+
+  /// \brief Determine whether one version number precedes another. If not
+  /// provided, minor and subminor version numbers are considered to be zero.
+  friend bool operator<(const VersionTuple &X, const VersionTuple &Y) {
+    if (X.Major != Y.Major)
+      return X.Major < Y.Major;
+
+    if (X.Minor != Y.Minor)
+      return X.Minor < Y.Minor;
+
+    return X.Subminor < Y.Subminor;
+  }
+
+  /// \brief Determine whether one version number follows another. If not
+  /// provided, minor and subminor version numbers are considered to be zero.
+  friend bool operator>(const VersionTuple &X, const VersionTuple &Y) {
+    return Y < X;
+  }
+
+  /// \brief Determine whether one version number precedes or is
+  /// equivalent to another. If not provided, minor and subminor
+  /// version numbers are considered to be zero.
+  friend bool operator<=(const VersionTuple &X, const VersionTuple &Y) {
+    return !(Y < X);
+  }
+
+  /// \brief Determine whether one version number follows or is
+  /// equivalent to another. If not provided, minor and subminor
+  /// version numbers are considered to be zero.
+  friend bool operator>=(const VersionTuple &X, const VersionTuple &Y) {
+    return !(X < Y);
+  }
+
+  /// \brief Retrieve a string representation of the version number/
+  std::string getAsString() const;
+};
+
+/// \brief Print a version number.
+llvm::raw_ostream& operator<<(llvm::raw_ostream &Out, const VersionTuple &V);
+
+} // end namespace clang
+#endif // LLVM_CLANG_BASIC_VERSIONTUPLE_H