NSObject related compile issue on Linux

[Kyle-Ye (Kyle)]

I have give option2 a try. It required more engineering time than I expected.

@Slava_Pestov

To get consistent behavior we would need a @_requiredButNotRequired attribute which allows this kind of unsafe pattern, and I don’t think such a pitch would advance very far.

Also considering the upstream may not accept it, I just stop my time on implementing it and focus on solving another more serious Linux issue.

Equatable + import Foundation cause compiler crash on Linux

Bug reproduce step: Add a C target define uint32 as a struct typedef uint32_t CAttribute __attribute((swift_newtype(struct))); import the C module and use the type in our Swift code. If we add Equatable to our Swift type and have import Foundation statement in the same module, we'll get a compiler crash here. import CDemoKit import Foundation public struct Demo { var attribute: CAttribute } extension Demo: Equatable {} Comment on Line 2 or Line 7 will not crash the compiler. Can…