Building iOS targets fail with Kotlin 1.6.20

[kubode]

Summary
After updating Kotlin to 1.6.20, the build task fails with an "Unresolved reference" error.

Version
3.2.2

Description

How to reproduce

See my sample project: https://github.com/kubode/ApolloKotlin1620Bug
Then run ./gradlew build and you will see the following errors.

> Task :shared:compileIosMainKotlinMetadata FAILED
e: /.../ApolloKotlin1620Bug/shared/src/iosMain/kotlin/com/github/kubode/apollokotlin1620bug/Platform.kt: (3, 12): Unresolved reference: apollographql
e: /.../ApolloKotlin1620Bug/shared/src/iosMain/kotlin/com/github/kubode/apollokotlin1620bug/Platform.kt: (8, 43): Unresolved reference: SqlNormalizedCacheFactory
e: /.../ApolloKotlin1620Bug/shared/src/iosMain/kotlin/com/github/kubode/apollokotlin1620bug/Platform.kt: (9, 17): Unresolved reference: SqlNormalizedCacheFactory

Codes

iosMain's actual class implementation:

It seems to reference the JVM actual class as metadata.

I think apollo-kotlin needs to migrate Kotlin to 1.6.20.

Workaround

If you set kotlin.mpp.hierarchicalStructureSupport=false in gradle.properties, this error will not happen.

[kubode]

Sorry, I continued to investigate and it may be a bug in Kotlin, not Apollo.
https://youtrack.jetbrains.com/issue/KT-51763
https://youtrack.jetbrains.com/issue/KT-51293

[kubode]

Close because it seems to be a bug in Kotlin for sure.

[martinbonnin]

Thanks for the investigations and heads up! Looks like there are a lot of moving parts at the moment in native world. this issue mentions setting org.gradle.configureondemand=false. Did that work for you?

[kubode]

Thank you for your information!
Unfortunatelly, settings org.gradle.configureondemand=false was not fix the problem on this sample project.

[martinbonnin]

Hi 👋 .

Thanks a lot for the reproducer! After digging a bit into this, I think this is "working as designed", not sure it's a Kotlin bug.

For more details: Apollo Kotlin doesn't support HMPP yet because some dependencies like Okio do not support it yet and I understand it's something that's a hard requirement. Kotlin 1.6.20 enabled HMPP by default which creates this issue. But if I disable HMPP in the ApolloKotlin1620Bug reproducer project, I can run ./gradlew build successfully.

It might be that you still have the error in your full scale project though? And not the ApolloKotlin1620Bug reproducer? I bumped into other bugs while updating to 1.6.20 in the project itself and had to do a few workarounds

[kubode]

Thanks for the detailed info!
I guess I did not understand HMPP correctly 😞

In my full scale project, ./gradlew publish succeeds by setting kotlin.mpp.hierarchicalStructureSupport=false.
(./gradlew publish fails with :shared:compareIosMainKotlinMetadata task unless setting kotlin.mpp.hierarchicalStructureSupport=false)
I haven't tried to run ./gradlew build on my project due to it takes a too long time.

I saw your workaround in build.gradle.kts, but it's not necessary for my project.

[martinbonnin]

Not really sure I got HMPP correctly either... 😅
My understanding is that kotlin.mpp.hierarchicalStructureSupport=false is still required for the time being for consumers of projects like okio or apollo.

If you still have an error with kotlin.mpp.hierarchicalStructureSupport=false, do you mind copy/pasting the stacktrace? It might be something else.

[kubode]

I’m not have any errors with kotlin.mpp.hierarchicalStructureSupport=false. Thanks!