2023-12-28T19:29:52Z Theo de Raadt <deraadt@openbsd.org>:
>> To my understanding it's an old BSDism and it's used to implement
>> isupper(3), islower(3), etc.
>
> The names may be old BSD, but this is following a pretty strong ISO rule
> that names starting with '_' are in reserved, and trying to use them
> yourself is undefined.
>
> Changing them to another name that won't collide? Maybe, I've no opinion.
Right, just found this[1]. Thanks Theo and Theo :)
[1] https://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html
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