Usage: /usr/share/couchdb/erts-13.2.2.16/bin/yielding_c_fun [-h]
       /usr/share/couchdb/erts-13.2.2.16/bin/yielding_c_fun [-use_gc [-print_gc_info]]
                              [-log_max_mem_usage log_file]
                              [(( -f | -frec | -fnoauto | -fextenal) function_name)...
                               [-output_file_name output_file]
                               [-header_file_name header_file]
                               [-debug]
                               [-only_yielding_funs]
                               [-static_aux_funs]
                               input_c_file]]

Please see the README.md file for more details.