[boost] [function] Function scope static not thread safe

The following code in function_template.hpp has me concerned: template<typename Functor> void assign_to(Functor f) { static vtable_type stored_vtable(f); if (stored_vtable.assign_to(f, functor)) vtable = &stored_vtable; else vtable = 0; } The function scope statics are not thread-safe as far as I know and this is potentially a show stopper for us (we're in the process of upgrading from 1.33.1 to 1.34+. Same usage in boost.serialization caused our application (very heavy threaded) to crash. Is there any plan to fix this? Or I'm wrong and this is not a problem. Regards, Sean