code: def add_flags(self, flag_name, flags, target_name=None, configuration_name=None):
          
          for configuration in self.objects.get_configurations_on_targets(target_name, configuration_name):
              configuration.add_flags(flag_name, flags)
docs: Adds the given flags to the flag_name section of the target on the configurations
          :param flag_name: name of the flag to be added the values to
          :param flags: A string or array of strings
          :param target_name: Target name or list of target names to add the flag to or None for every target
          :param configuration_name: Configuration name to add the flag to or None for every configuration
          :return: void