[swift-evolution] SwiftPM Xcode Integration

[Max Howell]

> In that context, I have a few questions:
>  * Is it intended that the generated Xcode project will be checked-in?

It’s up to you, but certainly it will not be required and we will recommend NOT editing the generated project.

>  * Will the project duplicate information that SwiftPM specifies? file references? configuration?

Yes, because it will be generated, consider it a build artefact.

>  * Will the rebuild clobber project configuration that SwiftPM can't specify? This is probably fine. Maybe Xcode should make configuration read-only in generated projects. 

Yes… don’t edit the projects! ;)