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diff --git a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
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index 00000000000..aed545697fb
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+++ b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
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+//===--- tools/extra/clang-tidy/ClangTidyMain.cpp - Clang tidy tool -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+///  \file This file implements a clang-tidy tool.
+///
+///  This tool uses the Clang Tooling infrastructure, see
+///    http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
+///  for details on setting it up with LLVM source tree.
+///
+//===----------------------------------------------------------------------===//
+
+#include "../ClangTidy.h"
+#include "clang/Driver/OptTable.h"
+#include "clang/Driver/Options.h"
+#include "llvm/Support/CommandLine.h"
+#include <vector>
+
+using namespace clang::ast_matchers;
+using namespace clang::driver;
+using namespace clang::tooling;
+using namespace llvm;
+
+cl::OptionCategory ClangTidyCategory("clang-tidy options");
+
+cl::list<std::string>
+Ranges(cl::Positional, cl::desc("<range0> [... <rangeN>]"), cl::OneOrMore);
+
+static cl::opt<std::string> Checks(
+    "checks",
+    cl::desc("Regular expression matching the names of the checks to be run."),
+    cl::init(".*"), cl::cat(ClangTidyCategory));
+static cl::opt<bool> Fix("fix", cl::desc("Fix detected errors if possible."),
+                         cl::init(false), cl::cat(ClangTidyCategory));
+
+// FIXME: Add option to list name/description of all checks.
+
+int main(int argc, const char **argv) {
+  cl::ParseCommandLineOptions(argc, argv, "TBD\n");
+  OwningPtr<clang::tooling::CompilationDatabase> Compilations(
+      FixedCompilationDatabase::loadFromCommandLine(argc, argv));
+  if (!Compilations)
+    return 0;
+  // FIXME: Load other compilation databases.
+
+  SmallVector<clang::tidy::ClangTidyError, 16> Errors;
+  clang::tidy::runClangTidy(Checks, *Compilations, Ranges, &Errors);
+  clang::tidy::handleErrors(Errors, Fix);
+
+  return 0;
+}