I am disappointed that there is no actual answer to the question in the title. I need an answer to this and this is the first hit on Google. Yet, all that I see here is suggestions for solving the specific issue but not the question in the title. To answer Quinn's question: In my case, I need to keep my code compatible with various SDK versions (for various reasons that are valid but shouldn't need to be justified here), so I need to add conditional code depending on the SDK version. And since it's a compile time issue, I cannot use @available() here, either. So I really need to know which SDK I'm compiling under.

nevermind

I just got this as well from a user of my app (Find Any File). Attached. This happened when a user wanted to copy an unknown number of file references to the pasteboard. Note that the app memory is around 18 GB. I wonder if the number of copied items is so large that the Mac simply ran out of memory. faf.crash