It (rather a minor variant of it) can actually distinguish GNU vs XSI strerror_r and write a portable wrapper that can use either!
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Ah, indeed, the return type is different!
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Oh, then that's a stopper. :-(
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Of course if you already know the function is declared in one way or the other, you can skip testing that, and then testing which function type it's compatible with is a simple use of _Generic.
End of conversation
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