[Bug libstdc++/52104] go1 fails to link on Solaris 8/9 x86 with native TLS

["redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52104

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-03 10:48:16 UTC ---
Are you sure this is using native TLS?

This part of the 49204 commit:

    (__future_base::_Async_state_common::_M_join): Serialize attempts to
    join thread.

adds:

    void _M_join() { std::call_once(_M_once, &thread::join, ref(_M_thread)); }

which is called from the destructor, which is defined in future.o

That calls call_once, which creates the missing symbol:

  template<typename _Callable, typename... _Args>
    void
    call_once(once_flag& __once, _Callable&& __f, _Args&&... __args)
    {
#ifdef _GLIBCXX_HAVE_TLS
      auto __bound_functor = std::__bind_simple(std::forward<_Callable>(__f),
          std::forward<_Args>(__args)...);
      __once_callable = &__bound_functor;
      __once_call = &__once_call_impl<decltype(__bound_functor)>;
#else
      unique_lock<mutex> __functor_lock(__get_once_mutex());
      auto __callable = std::__bind_simple(std::forward<_Callable>(__f),
          std::forward<_Args>(__args)...);
      __once_functor = [&]() { __callable(); };
      __set_once_functor_lock_ptr(&__functor_lock);
#endif

So the lambda and std::function are only used when _GLIBCXX_HAVE_TLS is not
defined