[riot-notifications] [RIOT-OS/RIOT] cpu/fe310: Use newlib_syscalls_default stub implementations (#15857)

Alexandre Abadie notifications at github.com
Tue Jan 26 14:18:19 CET 2021

@aabadie approved this pull request.

Tested several applications on the hifive1b: `examples/default` (stdio), `tests/malloc`, `tests/posix_semaphore`, `tests/posix_sleep`. All are still working.

Compared to master, I'm also noticing a significant firmware size reduction (~1KB with `examples/default`):

- master:
   text	   data	    bss	    dec	    hex	filename
  19418	    128	   2348	  21894	   5586	/work/riot/RIOT/examples/default/bin/hifive1b/default.elf
- this PR:
   text	   data	    bss	    dec	    hex	filename
  18490	    128	   2340	  20958	   51de	/work/riot/RIOT/examples/default/bin/hifive1b/default.elf

Thanks for the cleanup. ACK

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