What is the FreeBSD situation?

[Andrei Alexandrescu]

 From the recent PR-related discussion I gather that FreeBSD 12 has made 
some breaking changes to file primitives such as stat.

Do binaries built for pre-v12 crash on v12? If that's the case we should 
have two distinct build platforms, FreeBSD "legacy" and FreeBSD 12. They 
would be selected statically.

IF older binaries don't crash, what mechanism is FreeBSD 12 using to 
identify old API calls?


Thanks,

Andrei