--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils/not/not.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,45 @@
+//===- not.cpp - The 'not' testing tool -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+int main(int argc, const char **argv) {
+  bool ExpectCrash = false;
+
+  ++argv;
+  --argc;
+
+  if (argc > 0 && StringRef(argv[0]) == "--crash") {
+    ++argv;
+    --argc;
+    ExpectCrash = true;
+  }
+
+  if (argc == 0)
+    return 1;
+
+  std::string Program = sys::FindProgramByName(argv[0]);
+
+  std::string ErrMsg;
+  int Result = sys::ExecuteAndWait(Program, argv, 0, 0, 0, 0, &ErrMsg);
+  if (Result < 0) {
+    errs() << "Error: " << ErrMsg << "\n";
+    if (ExpectCrash)
+      return 0;
+    return 1;
+  }
+
+  if (ExpectCrash)
+    return 1;
+
+  return Result == 0;
+}