1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <iostream>
10 
11 // istream cerr;
12 
13 // RUN: %{build}
14 // RUN: %{exec} %t.exe 2> %t.err
15 // RUN: grep -e 'Hello World!' %t.err
16 
17 #include <iostream>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 int main(int, char**)
23 {
24 
25     std::cerr << "Hello World!\n";
26 
27 #ifdef _LIBCPP_HAS_NO_STDOUT
28     assert(std::cerr.tie() == NULL);
29 #else
30     assert(std::cerr.tie() == &std::cout);
31 #endif
32     assert(std::cerr.flags() & std::ios_base::unitbuf);
33 
34   return 0;
35 }
36