Logger: can't compile with Intel + invalid enum value

The compiler complains about this:

runner_others.c(772): error #188: enumerated type mixed with another type
                            /* flag= */ 0, /* flag_data= */ 0);

for this call:

          logger_log_part(e->logger, p, xp, e, /* log_all_fields= */ 0,
                          /* flag= */ 0, /* flag_data= */ 0);

(and similar ones just below)

That's easy to fix in principle by using the correct enum type here rather than just 0. However, there is a more fundamental problem here.

The function expects an enum of type logger_special_flags whose definition is:

enum logger_special_flags {
  logger_flag_change_type = 1, /* Flag for a change of particle type */
  logger_flag_mpi_enter, /* Flag for a particle received from another  MPI rank                                                                                                                                                                                                           
                          */
  logger_flag_mpi_exit,  /* Flag for a particle sent to another MPI rank */
  logger_flag_delete,    /* Flag for a deleted particle */
  logger_flag_create,    /* Flag for a created particle */
} __attribute__((packed));

With this definition, 0 is not a valid value covered by the enum. Not sure whether the functions behave correctly down the line with this case not being handled.