@conven92 Well, since it said it was only for ARM, I hadn't tried those. So now I did, and the same result comes out:
> atomiks.obj : error LNK2019: unresolved external symbol > InterlockedExchangeAdd64_nf (with or without a "_" as prefix). While I'd like to know what is going on, it is basically an "optimisation" problem, because the code will still work "with" a fence. So I'm (for now) leaving this as an "unsolved mistery", and moving on to add cluster support to my code, which is more important.