New comment by oreo639 on void-packages repository https://github.com/void-linux/void-packages/pull/41698#issuecomment-1493429282 Comment: Thank you for pointing that out. The value of `std::atomic::is_always_lock_free` depends on the value of `ATOMIC_LLONG_LOCK_FREE`: https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/std/atomic#L931 https://en.cppreference.com/w/c/atomic/ATOMIC_LOCK_FREE_consts With `ATOMIC_LLONG_LOCK_FREE = 1` on armv6. (meaning "sometimes lock free" ) https://stackoverflow.com/a/64253858