Detecting platform in cmake (which I hate).
WHY do you display "armv71", yet can't match the string "armv71"???!?

I'll need to post my cmake lists and cli results on stackoverflow.

OK, last try, I'll copy and paste from the terminal into my file.

Ooooh! You weren't saying "armv71"! You were saying "armv7l"! 😥

(And my font does make a difference between l and 1)