does that mean that the swift-driver is currently used if bootstrapping is enabled?
The swift-driver is now a separate executable written in Swift and is separate from the bootstrapping effort in the main swift-frontend executable, which is still mostly C++.
What is the timeline of moving the Swift compiler into Swift, e.g. with swift-driver? What is the timeline of getting arm64 Macs to build the project with bootstrapping turned on?
When it's done? I've never seen a timeline for any internal compiler efforts.
Does the Swift compiler shipped with Xcode currently have bootstrapping turned on?
You can check this for yourself, as I did for linux, by seeing if the macOS compiler links against the Swift stdlib.
Does performance typically differ between the C++ and Swift version of each piece?
I think they said the Swift version was 10-30% slower? Just a vague impression I have from some forum post.
This comment is wrong. I'll remove it.
@Erik_Eckstein, @anthonylatsis put that in a couple months ago because of this issue.