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diff --git a/lib/Tooling/CommandLineClangTool.cpp b/lib/Tooling/CommandLineClangTool.cpp
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+++ b/lib/Tooling/CommandLineClangTool.cpp
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+//===--- CommandLineClangTool.cpp - command-line clang tools driver -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements the CommandLineClangTool class used to run clang
+//  tools as separate command-line applications with a consistent common
+//  interface for handling compilation database and input files.
+//
+//  It provides a common subset of command-line options, common algorithm
+//  for locating a compilation database and source files, and help messages
+//  for the basic command-line interface.
+//
+//  It creates a CompilationDatabase, initializes a ClangTool and runs a
+//  user-specified FrontendAction over all TUs in which the given files are
+//  compiled.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Tooling/CommandLineClangTool.h"
+#include "clang/Tooling/Tooling.h"
+
+using namespace clang::tooling;
+using namespace llvm;
+
+static const char *MoreHelpText =
+    "\n"
+    "-p <build-path> is used to read a compile command database.\n"
+    "\n"
+    "\tFor example, it can be a CMake build directory in which a file named\n"
+    "\tcompile_commands.json exists (use -DCMAKE_EXPORT_COMPILE_COMMANDS=ON\n"
+    "\tCMake option to get this output). When no build path is specified,\n"
+    "\tclang-check will attempt to locate it automatically using all parent\n"
+    "\tpaths of the first input file. See:\n"
+    "\thttp://clang.llvm.org/docs/HowToSetupToolingForLLVM.html for an\n"
+    "\texample of setting up Clang Tooling on a source tree.\n"
+    "\n"
+    "<source0> ... specify the paths of source files. These paths are looked\n"
+    "\tup in the compile command database. If the path of a file is absolute,\n"
+    "\tit needs to point into CMake's source tree. If the path is relative,\n"
+    "\tthe current working directory needs to be in the CMake source tree and\n"
+    "\tthe file must be in a subdirectory of the current working directory.\n"
+    "\t\"./\" prefixes in the relative files will be automatically removed,\n"
+    "\tbut the rest of a relative path must be a suffix of a path in the\n"
+    "\tcompile command database.\n"
+    "\n";
+
+CommandLineClangTool::CommandLineClangTool() :
+    BuildPath("p", cl::desc("Build path"), cl::Optional),
+    SourcePaths(cl::Positional, cl::desc("<source0> [... <sourceN>]"),
+                cl::OneOrMore),
+    MoreHelp(MoreHelpText) {
+}
+
+void CommandLineClangTool::initialize(int argc, const char **argv) {
+  Compilations.reset(FixedCompilationDatabase::loadFromCommandLine(argc, argv));
+  cl::ParseCommandLineOptions(argc, argv);
+  if (!Compilations) {
+    std::string ErrorMessage;
+    if (!BuildPath.empty()) {
+      Compilations.reset(CompilationDatabase::autoDetectFromDirectory(
+                              BuildPath, ErrorMessage));
+    } else {
+      Compilations.reset(CompilationDatabase::autoDetectFromSource(
+                              SourcePaths[0], ErrorMessage));
+    }
+    if (!Compilations)
+      llvm::report_fatal_error(ErrorMessage);
+  }
+}
+
+int CommandLineClangTool::run(FrontendActionFactory *ActionFactory) {
+  ClangTool Tool(*Compilations, SourcePaths);
+  return Tool.run(ActionFactory);
+}