[riot-notifications] [RIOT-OS/RIOT] sys: stdio_null: add null driver (#10741)

Kaspar Schleiser notifications at github.com
Thu Jan 10 12:34:45 CET 2019

> Nevertheless, we should investigate if an alternative without any dependency to `stdio` (but without `#ifdefs` around every `printf()`) is viable.

Well, one way is to use ```LOG_``` macros instead of printf, as they can be disabled completely. Dropping stdio_uart and periph/uart goes a long way, but being able to also drop newlib's stdio code has the most wins...

+1 for adding this, even if the only user is the bootloader on EFM32.

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