Annex K is optional and the only compiler I'm aware of implementing it is MSVC (and only Microsoft wanted that in the standard), so the support for it will be nonexistent in "normal" tooling. If you need it, check if MS has something.
> Annex K is optional and the only compiler I'm aware of implementing it is MSVC (and only Microsoft wanted that in the standard),
And to rub salt into the wound, the Annex K functions supplied with MSVC are non-conforming to the standards Annex K functions, which were also pushed hard by Microsoft, which make them kinda doubly pointless: you use them and make code that is neither portable to another compiler nor conforming to the standard :-/
