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diff --git a/tools/opt/NewPMDriver.h b/tools/opt/NewPMDriver.h
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+//===- NewPMDriver.h - Function to drive opt with the new PM ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// A single function which is called to drive the opt behavior for the new
+/// PassManager.
+///
+/// This is only in a separate TU with a header to avoid including all of the
+/// old pass manager headers and the new pass manager headers into the same
+/// file. Eventually all of the routines here will get folded back into
+/// opt.cpp.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_OPT_NEW_PM_DRIVER_H
+#define LLVM_TOOLS_OPT_NEW_PM_DRIVER_H
+
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+class LLVMContext;
+class Module;
+class tool_output_file;
+
+/// \brief Driver function to run the new pass manager over a module.
+///
+/// This function only exists factored away from opt.cpp in order to prevent
+/// inclusion of the new pass manager headers and the old headers into the same
+/// file. It's interface is consequentially somewhat ad-hoc, but will go away
+/// when the transition finishes.
+bool runPassPipeline(StringRef Arg0, LLVMContext &Context, Module &M,
+                     tool_output_file *Out, StringRef PassPipeline,
+                     bool NoOutput);
+}
+
+#endif