yota9 added a comment. The problem here is that if you would remove the freestanding condition and run this test it would fail since "-target-feature" "+outline-atomics" would be passed to the clang. And usually we don't want the compiler to use any external symbols in freestanding mode, this is the reason why -fno-builtin is implied with freestanding option. So it seems to be logical to me to disable outline-atomics too in this situation even if the compiler have runtime library available
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