union file

fastddsgen (4.0.2 version), based on struct.idl (include union.idl) file, generated cmake example, ld reported an error undefined reference calculate_serialized_size (union), the reason is that the union.idl file did not generate the unionPubSubTypes.cxx file, resulting in the unionCdrAux.ipp file not being included, ld reported an error, how to solve it, thank you