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 #ifdef BE_THE_HEADER 11 12 #pragma clang system_header 13 14 namespace std { 15 namespace __atomic0 { 16 typedef int foobar; 17 } 18 namespace __atomic1 { 19 typedef void foobar; 20 } 21 22 inline namespace __atomic0 {} 23 } 24 25 #else 26 27 #define BE_THE_HEADER 28 #include "libstdcxx_atomic_ns_hack.cpp" 29 30 std::foobar fb; 31 32 using T = void; // expected-note {{here}} 33 using T = std::foobar; // expected-error {{different types ('std::foobar' (aka 'int') vs 'void')}} 34 35 #endif 36