Support K2

[mgroth0]

With Proguard 7.4.1 and Kotlin 2.0.0-Beta2 we get the error "Kotlin versions up to 1.9 are supported."

I am sure that Proguard support for K2 is coming, but I couldn't find an issue or mention of this anywhere. Creating this so I can get notified when it is available.

[timeking]

@mgroth0 , it seems you are using incorrect gradle kotlin plugin. Try to use 2.0.0-Beta2 (Beta5 now). I see proguard uses version from the dependency.
FYI: it have an error still for Kotlin 2.0.0 metadata, but another one:

Encountered corrupt @kotlin/Metadata for class com/example/Example (version 2.0.0).

[mgroth0]

Thank you for the update @timeking . I am not sure what you mean about me using the incorrect plugin, at the time I wrote this I was using 2.0.0-Beta2.

So if I understand correctly, you are saying that the "Kotlin versions up to 1.9 are supported." is now fixed, however there is some other issue with K2 now. In that case, I propose we keep this open so we can track when K2 is fully ready.

[EchoEllet]

It looks like 7.5.0 might already solve this issue but the changes haven't been published yet, if you take a look at Gradle Task section you will see 7.5.0, also in the commits history

Looking forward to seeing the new version.

[mipastgt]

Is there an ETA for the K2 support now that it has been officially released? It would be nice to be able to build Compose Multiplatform apps again. See: https://kotlinlang.slack.com/archives/C01D6HTPATV/p1716746013470279

[mrjameshamilton]

ProGuard 7.5 has just been published with Kotlin 2 support.