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diff --git a/examples/Tooling/ClangCheck.cpp b/examples/Tooling/ClangCheck.cpp
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+//===- examples/Tooling/ClangCheck.cpp - Clang check tool -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements a clang-check tool that runs the
+//  clang::SyntaxOnlyAction over a number of translation units.
+//
+//  Usage:
+//  clang-check <cmake-output-dir> <file1> <file2> ...
+//
+//  Where <cmake-output-dir> is a CMake build directory in which a file named
+//  compile_commands.json exists (enable -DCMAKE_EXPORT_COMPILE_COMMANDS in
+//  CMake to get this output).
+//
+//  <file1> ... specify the paths of files in the CMake source tree. This  path
+//  is looked up in the compile command database. If the path of a file is
+//  absolute, it needs to point into CMake's source tree. If the path is
+//  relative, the current working directory needs to be in the CMake source
+//  tree and the file must be in a subdirectory of the current working
+//  directory. "./" prefixes in the relative files will be automatically
+//  removed, but the rest of a relative path must be a suffix of a path in
+//  the compile command line database.
+//
+//  For example, to use clang-check on all files in a subtree of the source
+//  tree, use:
+//
+//    /path/in/subtree $ find . -name '*.cpp'| xargs clang-check /path/to/source
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Tooling/Tooling.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/system_error.h"
+
+/// \brief Returns the absolute path of 'File', by prepending it with
+/// 'BaseDirectory' if 'File' is not absolute. Otherwise returns 'File'.
+/// If 'File' starts with "./", the returned path will not contain the "./".
+/// Otherwise, the returned path will contain the literal path-concatenation of
+/// 'BaseDirectory' and 'File'.
+///
+/// \param File Either an absolute or relative path.
+/// \param BaseDirectory An absolute path.
+///
+/// FIXME: Put this somewhere where it is more generally available.
+static std::string GetAbsolutePath(
+    llvm::StringRef File, llvm::StringRef BaseDirectory) {
+  assert(llvm::sys::path::is_absolute(BaseDirectory));
+  if (llvm::sys::path::is_absolute(File)) {
+    return File;
+  }
+  llvm::StringRef RelativePath(File);
+  if (RelativePath.startswith("./")) {
+    RelativePath = RelativePath.substr(strlen("./"));
+  }
+  llvm::SmallString<1024> AbsolutePath(BaseDirectory);
+  llvm::sys::path::append(AbsolutePath, RelativePath);
+  return AbsolutePath.str();
+}
+
+int main(int argc, char **argv) {
+  if (argc < 3) {
+    llvm::outs() << "Usage: " << argv[0] << " <cmake-output-dir> "
+                 << "<file1> <file2> ...\n";
+    return 1;
+  }
+  // FIXME: We should pull how to find the database into the Tooling package.
+  llvm::OwningPtr<llvm::MemoryBuffer> JsonDatabase;
+  llvm::SmallString<1024> JsonDatabasePath(argv[1]);
+  llvm::sys::path::append(JsonDatabasePath, "compile_commands.json");
+  llvm::error_code Result =
+      llvm::MemoryBuffer::getFile(JsonDatabasePath, JsonDatabase);
+  if (Result != 0) {
+    llvm::outs() << "Error while opening JSON database: " << Result.message()
+                 << "\n";
+    return 1;
+  }
+  llvm::StringRef BaseDirectory(::getenv("PWD"));
+  for (int I = 2; I < argc; ++I) {
+    llvm::SmallString<1024> File(GetAbsolutePath(argv[I], BaseDirectory));
+    llvm::outs() << "Processing " << File << ".\n";
+    std::string ErrorMessage;
+    clang::tooling::CompileCommand LookupResult =
+        clang::tooling::FindCompileArgsInJsonDatabase(
+            File.str(), JsonDatabase->getBuffer(), ErrorMessage);
+    if (!LookupResult.CommandLine.empty()) {
+      if (!clang::tooling::RunToolWithFlags(
+               new clang::SyntaxOnlyAction,
+               LookupResult.CommandLine.size(),
+               clang::tooling::CommandLineToArgv(
+                   &LookupResult.CommandLine).data())) {
+        llvm::outs() << "Error while processing " << File << ".\n";
+      }
+    } else {
+      llvm::outs() << "Skipping " << File << ". Command line not found.\n";
+    }
+  }
+  return 0;
+}