g++'s cool messages (1)

In file included from ../cache/CostFunction.hpp:3, from Session.hpp:56, from Session.cpp:44: ../metadata/UserPreferences.hpp: In copy constructor `Feature::Feature(const Feature&)': ../metadata/UserPreferences.hpp:193: warning: cannot pass objects of non-POD type `const struct Feature' through `...'; call will abort at runtime ../metadata/UserPreferences