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Actually, coreutils tries to use all the *_unlocked variants of stdio, since those have better speed in single-threaded programs (all but sort are single-threaded, and sort skips stdio). I do know that cygwin has putchar_unlocked, but does not have quite as many *_unlocked variants as Linux, so it may be a case where the configure logic to detect _unlocked functions went wrong and cygwin ends up using putchar instead of putchar_unlocked as a result. I'll have to look into it more.
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