How to switch a project from Swift 6 to Swift 5?

[isenberg]

I got my iOS app somewhat running by using the skip-fuse example project as base, but now need to switch from the default Swift 6 to 5 as otherwise too many changes on the iOS app-side are currently needed.

Changing the following to 5, cleanign the build folder, restarting Xcode and android emulator and rebuild, still results in Swift 6 strict concurrence check in the android toolchain in some way as I still see the same errors:

Darwin/MyApp.xcconfig‎:
SWIFT_VERSION = 6

Darwin/MyApp.xcodeproj/project.pbxproj‎:
SWIFT_VERSION = 6.0

Anything else to change?
I see in Package.swift the comment "// swift-tools-version: 6.1", but no properties with it.

Or is creating a new project from scratch and copying the iOS source files into it the quicker way?

[marcprux]

Can you try setting Package(…, swiftLanguageModes: [.v5]) in your Package.swift? Setting
swiftLanguageModes to v5 should disable Swift 6 concurrency enforcement.

The XCode SWIFT_VERSION will only affect the Xcode project itself, but each imported SwiftPM module will define its own language mode.

[isenberg]

That worked, thanks!