following pods are integrated into targets that do not have the same Swift version

Question

I am updating my project to Swift 3. When updating some of my cocoapods to swift 3, I receive the following message in terminal, after running pod install:

Answer 1

This problem gets worse with Xcode 9 since it supports both 3.2 and 4.0 swift versions, but Cocoa Pods doesn't support this yet:

[!] The following pods are integrated into targets that do not have the same Swift version:
- XCGLogger required by target1 (Swift 4.0), target2 (Swift 3.0)

Workaround: switch target1 to swift 3.2 temporarily, install cocoa pods, then switch it back to swift 4.0.