mac/clang-cxx-library/libstdc%2B%2B.cc

// Copyright (c) 2013 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <string>
#ifndef __GLIBCXX__
#error expected std library: libstdc++
#endif

int main() { return 0; }