LemonBoy 518168edb2 compiler-rt: Avoid exposing atomic builtins when not supported ...

Let's a void any kind of compilation/LLVM errors for niche targets such
as AVR/MSP430 or ARM v6m. By not exporting any atomic builtin anymore
the user is free to provide their own implementation (that disable the
IRQs) or to provide the --single-threaded switch and forget about this.

2020-12-09 16:33:53 +01:00

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