BatLog.MakeBuild a logger module with custom, fixed output, prefix and flags
val logf : ?fp:string -> ('a, S.t BatIO.output, unit) Pervasives.format -> 'aAs Printf.printf, only the message is printed to the logging output and prefixed with status information per the current flags and the currently set prefix.
fatal s logs the message s and then calls exit 1. This exits the program with return code 1.
val fatalf : ?fp:string -> ('a, S.t BatIO.output, unit) Pervasives.format -> 'afatalf allows a format string (as Printf.printf)and the arguments to that format string to build the logging message. Exits the program with return code 1.