Comment 3 for bug 1228333

The command line above does not say "no defaults" so there might be a default file loaded somewhere. The reason I'm asking is that --binlog option is generated only when opt_bin_logname global variable is set. And it does not happen here. Next thing to check is that you're running the latest 5.6.

--binlog option is 5.6 specific, it is to transfer the last binlog file that contains MySQL "gtids" to sync them between the nodes.