I get a ton of warnings (well over 5000 in the code base I am compiling) from function_base.hpp when compiling with gcc. boost-1.46.0/include/boost/function/function_base.hpp:321: warning: dereferencing type-punned pointer will break strict-aliasing rules boost-1.46.0/include/boost/function/function_base.hpp:325: warning: dereferencing type-punned pointer will break strict-aliasing rules This has been a known problem for a very long time, and the work around is quite simple. Replace reinterpret_cast(&in_buffer.data)->~Functor(); with functor_type* p = reinterpret_cast(&in_buffer.data); p->~Functor(); and replace reinterpret_cast(&out_buffer.data)->~Functor(); with functor_type* p = reinterpret_cast(&out_buffer.data); p->~Functor(); Would it be a reasonable request to have this simple patch applied to the boost source code? Respectfully, Justin