I'm speaking from memory and it's possible that the situation has changed since 1.39 and the message is now spurious. If so send a small test case which shows that the library has a bug.
Robert Ramey
The case you highlight is correct, and should produce a warning message. However a small variation shown below produces the same message, which I believe is wrong . This warning message is present in1.39, 1.40 on HPUX and AIX , on Linux/gcc there is _no_ such warning. class concrete { ... }; class base { ~virtual base(); ... vector<boost::shared_ptr<concrete> > vec_; }; class derived : public base { .... }; BOOST_CLASS_EXPORT(Derived); Here you will see the same warning message, saying that class 'concrete' should be polymorphic. Best regards. Ta, Avi