Can I downgrade swift version to moderate error 'Module compiled with Swift x.x cannot be imported by the Swift x.x compiler'?

Question

I recently started my very first swift experience and I got an error

'Module compiled with Swift 4.2.1 cannot be imported by the Swift 5.0 compiler'

I thought that I can moderate this error just selecting my swift language version on build settings. but it doesn't work.

After few searching, I found that there are two options

Downgrade Xcode
Update modules or Rebuild modules using swift 5.0

Are they only options I got? I don't know why changing swift language version does not do anything.

Rudedog · Accepted Answer · 2019-10-21 22:19:38Z

1

The swift 5 compiler which is bundled with Xcode 10.2 can compile in swift 4 mode. However, it is still the swift 5 compiler and not the swift 4 compiler that came in Xcode 10.1. Modules built with the swift 4 compiler can’t be imported by the swift 5 compiler.

Therefore, the two options you listed are the only options you have.

edited Oct 21, 2019 at 22:19

answered Apr 24, 2019 at 5:00

Rudedog

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2 Comments

Rudedog Over a year ago

Yup. The following link gives you more details. Module stability (which you want) might come in Swift 6. swift.org/blog/abi-stability-and-more

cliwo Over a year ago

I ended up with downgrading my xcode. 😂 but anyway thank you for your nice and precise explanation.

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