[riot-notifications] [RIOT-OS/RIOT] sys/Makefile.include: check for newlib_nano instead of USE_NANO_SPECS (#11883)

Gaëtan Harter notifications at github.com
Mon Jul 22 19:02:35 CEST 2019

The issue from `tests/thread_float` is that `thread_yield()` is called from interrupt context which switch out of the interrupt for `msba2` like `thread_yield_higher` as shown in #11759 (must be the same for `msp430`).

Nothing in the documentation says if it is supposed to work in interrupt or not.
Interrupts have their own `sched_context_switch_request = 1;` to trigger `thread_yield_higher()`.

How an interrupt is supposed to trigger a normal `thread_yield()`?

This should be moved to a separated issue though and does not block this PR.

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