http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53543
Bug #: 53543 Summary: [unordered_map] conflict with __is_convertible clang intrinsic Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: zeratul...@hotmail.com The trunk implementation of unordered_map uses the following alias template at class scope: template<typename _Pair> using __is_convertible = std::is_convertible<_Pair, value_type>; Clang cannot compile this because __is_convertible is a clang intrinsic (much like how __is_base_of is a gcc intrinsic). I asked on the clang mailing list what can be done about this, and they suggested: "Since GCC 4.8 is not yet released, and Clang versions with the __is_convertible intrinsic are, the best solution would be to politely ask the libstdc++ maintainers to change this name." Would it be possible to entertain this request?