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 // FILE_DEPENDENCIES: %t.exe
14 // RUN: %{build}
15 // RUN: %{exec} %t.exe 2> %t.err
16 // RUN: grep -e 'Hello World!' %t.err
17 
18 #include <iostream>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 
23 int main(int, char**)
24 {
25 
26     std::cerr << "Hello World!\n";
27 
28 #ifdef _LIBCPP_HAS_NO_STDOUT
29     assert(std::cerr.tie() == NULL);
30 #else
31     assert(std::cerr.tie() == &std::cout);
32 #endif
33     assert(std::cerr.flags() & std::ios_base::unitbuf);
34 
35   return 0;
36 }
37