I think internally in the Kamailio we are using the "arm64" definition for the Mac, e.g. used below (commit ab1831e).

src/core/atomic/atomic_unknown.h:
#if defined __CPU_arm64 && defined __OS_darwin
/* fallback to locking-variant of atomic ops for OSes used for development
* - MacOS with Apple silicon */
#else
#warning no native memory barrier implementations, falling back to slow lock
based workaround
#endif

The aarch64 used elsewhere is for actual ARM processors, like embedded systems.
We probably need to detect or anticipate this special architecture in the cmake as well.

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