Piotr Caban (@piotr) commented about dlls/msvcrt/cpp.c:
DEFINE_RTTI_DATA2( __non_rtti_object, 0, &bad_typeid_rtti_base_descriptor, &exception_rtti_base_descriptor, ".?AV__non_rtti_object@@" ) #endif
+#ifdef __x86_64__ DEFINE_CXX_EXCEPTION0( exception, exception_dtor ) +#endif
This is looking wrong, probably the line needs to be removed instead.