[boost] [Serialization] virtual function and virtual inheritance

Hi, I have a compilation error with a virtual function inside a virtual base class. For example, I just add a function f() inside the unit test : "test_diamond.cpp". class base { ... virtual void f() =0; ... }; class derived1 { ... virtual void f(){} ... }; gcc 4.3, returns me an error: error: no unique final overrider for `virtual void base::f()' in `boost::detail::is_virtual_base_of_impl<derived1, final, mpl_::bool_< true> >::X' The same code works properly with msvc 2005. Best regards, Fabien Castan