This pragma selects an extended version of microlib that uses full standard ANSI C input and output functionality.
Microlib is an alternative library to the default C library. Only use this pragma if you are using microlib.
The following exceptions apply:
setbuf()are guaranteed to fail.
0 because the error and end-of-file indicators
are not supported.
guaranteed to fail because all streams are unbuffered.
This version of microlib
stdio can be retargeted
in the same way as the standardlib