1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
2 
3 // libstdc++ 4.6.x contains a bug where it defines std::__atomic[0,1,2] as a
4 // non-inline namespace, then selects one of those namespaces and reopens it
5 // as inline, as a strange way of providing something like a using-directive.
6 // Clang has an egregious hack to work around the problem, by allowing a
7 // namespace to be converted from non-inline to inline in this one specific
8 // case.
9 
10 // the last 4.6 release was 2013, so the hack is removed.  This checks __atomic
11 // is not special.
12 #ifdef BE_THE_HEADER
13 
14 #pragma clang system_header
15 
16 namespace std {
17 namespace __atomic0 { // expected-note {{previous definition}}
18 typedef int foobar;
19 } // namespace __atomic0
20 namespace __atomic1 {
21 typedef void foobar;
22 } // namespace __atomic1
23 
24 inline namespace __atomic0 {} // expected-error {{cannot be reopened as inline}}
25 } // namespace std
26 
27 #else
28 
29 #define BE_THE_HEADER
30 #include "libstdcxx_atomic_ns_hack.cpp"
31 
32 std::foobar fb; // expected-error {{no type named 'foobar' in namespace}}
33 
34 #endif
35