clang/test/SemaCXX/libstdcxx_atomic_ns_hack.cpp

   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