e2ac8bb3f1
This new config option allows to control whether MicroPython uses its own internal printf or not (if not, an external one should be linked in). Accompanying this new option is the inclusion of lib/utils/printf.c in the core list of source files, so that ports no longer need to include it themselves.
This directory contains standard, low-level C libraries with emphasis on being independent and efficient. They can be used by any port.