I'm not sure if it fixes everything, but I was able debug some of the meta-programming and find a discrepancy between gcc and Sun CC which causes normal usage to break. http://www.boost.org/doc/libs/1_39_0/boost/intrusive/detail/utilities.hpp template <class T> struct internal_base_hook_bool { template<bool Add> struct two_or_three {one _[2 + Add];}; template <class U> static one test(...); template <class U> static two_or_three test (detail::bool_* = 0); static const std::size_t value = sizeof(test<T>(0)); }; On gcc it does what it's suppose to; value = 1 - iff T has no boost_intrusive_tags::is_base_hook 2 - iff T::boost_intrusive_tags::is_base_hook=false 3 - iff T::boost_intrusive_tags::is_base_hook=true On Sun CC it's always 1. So this is a usage of SFINAE which doesn't seem to work on SunCC, but other examples do work just fine: class_has_move_assign here: http://www.boost.org/doc/libs/1_38_0/boost/unordered/detail/move.hpp Note how they use a second test(int) function. This works on Sun CC! 1) I've never submitted a change. Will someone else take this over or do I need to dive in and submit changes to the repository? Do I need to talk this library's owner first? 2) Is this a definite CC compiler bug?