Simplify atomic availability detection. #400
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Dirbaio
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- `cfg(target_has_atomic)` is stable now, use that. - Hardcode in `build.rs` the list of targets with load/store but no CAS, since `cfg(target_has_atomic_load_store)` is not stable yet. - Do not try to autodetect whether `portable-atomic` is needed or not, just let the user control it directly. If the user doesn't explicitly enable `portable-atomic` and native atomics are unavailable, the features requiring it will be missing.
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cfg(target_has_atomic)is stable now, use that.build.rsthe list of targets with load/store but no CAS, sincecfg(target_has_atomic_load_store)is not stable yet.portable-atomicis needed or not, just let the user control it directly. If the user doesn't explicitly enableportable-atomicand native atomics are unavailable, the features requiring it will be missing.