[riot-notifications] [RIOT-OS/RIOT] core: fix c11 atomic definitions (fix gcc9 compilation) (#11514)

Marian Buschsieweke notifications at github.com
Wed May 15 14:16:54 CEST 2019

The parameters have to be qualified as Pointer to `volatile` memory here, as this is the official API specification. I think there is no other choice than casting the `void`-Pointer to `volatile` memory to a Pointer to `volatile uintXY_t`. This should for the given C code result in the same machine code to be generated anyway, just without relying on undefined behavior.

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