cpu/common/esp8266: use 'awk/printf' instead of 'echo' #12850
Merged
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Contribution description
This is a fix for the same issue encountered with the esp32 in #12244
With the new esp toolchain from #11108, this breaks on OSX.
So this changes the uses of "echo -n" to printf, in the same way as #12282
Testing procedure
Same as #12282
Issues/PRs references
Fixes issue #12244 for the esp8266