Petri Lehtinen added the comment:

Serhiy Storchaka wrote:
> This can be done in compile time. Something like:
> 
>   if ((uid_t)-1 > 0) ...

Ah, neat. I would have expected that to issue a compiler warning,
though, because the comparison is always true if the type is unsigned,
but at least gcc doesn't seem to warn.

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