You need either to recompile MSL library to not use console IO buffering, or you can change this at runtime with setvbuf. e.g. "setvbuf(stdout, NULL, _IONBF, 0);"
If you decide to recompile MSL, you need to change _MSL_BUFFERED_CONSOLE define to 0 in ansi_prefix.PPCEABI.bare.h.
Regards,
Teo