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diff --git a/include/llvm/WindowsManifest/WindowsManifestMerger.h b/include/llvm/WindowsManifest/WindowsManifestMerger.h
new file mode 100644
index 0000000000000..302d3705887b7
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+++ b/include/llvm/WindowsManifest/WindowsManifestMerger.h
@@ -0,0 +1,66 @@
+//===-- WindowsManifestMerger.h ---------------------------------*- C++-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===---------------------------------------------------------------------===//
+//
+// This file provides a utility for merging Microsoft .manifest files.  These
+// files are xml documents which contain meta-information about applications,
+// such as whether or not admin access is required, system compatibility,
+// versions, etc.  Part of the linking process of an executable may require
+// merging several of these .manifest files using a tree-merge following
+// specific rules.  Unfortunately, these rules are not documented well
+// anywhere.  However, a careful investigation of the behavior of the original
+// Microsoft Manifest Tool (mt.exe) revealed the rules of this merge.  As the
+// saying goes, code is the best documentation, so please look below if you are
+// interested in the exact merging requirements.
+//
+// Ref:
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa374191(v=vs.85).aspx
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_INCLUDE_LLVM_SUPPORT_WINDOWS_MANIFEST_MERGER_H
+#define LLVM_INCLUDE_LLVM_SUPPORT_WINDOWS_MANIFEST_MERGER_H
+
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+
+class MemoryBuffer;
+
+namespace windows_manifest {
+
+bool isAvailable();
+
+class WindowsManifestError : public ErrorInfo<WindowsManifestError, ECError> {
+public:
+  static char ID;
+  WindowsManifestError(const Twine &Msg);
+  void log(raw_ostream &OS) const override;
+
+private:
+  std::string Msg;
+};
+
+class WindowsManifestMerger {
+public:
+  WindowsManifestMerger();
+  ~WindowsManifestMerger();
+  Error merge(const MemoryBuffer &Manifest);
+
+  // Returns vector containing merged xml manifest, or uninitialized vector for
+  // empty manifest.
+  std::unique_ptr<MemoryBuffer> getMergedManifest();
+
+private:
+  class WindowsManifestMergerImpl;
+  std::unique_ptr<WindowsManifestMergerImpl> Impl;
+};
+
+} // namespace windows_manifest
+} // namespace llvm
+#endif