-extern int opt_all_field_names,
- opt_scope_field_names,
- opt_header_field_names,
- opt_context_field_names,
- opt_payload_field_names,
- opt_all_fields,
- opt_trace_field,
- opt_trace_domain_field,
- opt_trace_procname_field,
- opt_trace_vpid_field,
- opt_trace_hostname_field,
- opt_trace_default_fields,
- opt_loglevel_field,
- opt_emf_field,
- opt_callsite_field,
- opt_delta_field,
- opt_clock_cycles,
- opt_clock_seconds,
- opt_clock_date,
- opt_clock_gmt,
- opt_clock_force_correlate;