[iOS] Compile error when using delegated property with @Composable getters in objects

[JunkFood02]

Affected platforms
Select one of the platforms below:

• iOS

Versions
Using the Compose for iOS template

To Reproduce
Sample code:

object Surfaces {
    val surfaceDim: Color
        @Composable
        get() = Color.Transparent
}

Error report

> Task :shared:linkPodDebugFrameworkIosSimulatorArm64 FAILED
warning: Cannot infer a bundle ID from packages of source files and exported dependencies, use the bundle name instead: shared. Please specify the bundle ID explicitly using the -Xbinary=bundleId=<id> compiler flag.
error: There is still an unbound symbol after generation of IR module <shared>:
Unbound public symbol IrSimpleFunctionPublicSymbolImpl: theme/Surfaces.surfaceDim.<get-surfaceDim>|-917462939767848401[0]

This could happen if there are two libraries, where one library was compiled against the different version of the other library than the one currently used in the project. Please check that the project configuration is correct and has consistent versions of dependencies.
error: Compilation finished with errors

Additional context

This only happens with getter annotated with @Composable in object or companion object of classes. Declare such functions at the top level of file won't cause this issue.

[eymar]

This was fixed in compose multiplatform compiler plugin 1.4.7-rc01. It will be included automatically in the next compose multiplatform release.

It requires kotlin 1.8.21.

For now it can be enabled like this:

compose {
    kotlinCompilerPlugin.set("org.jetbrains.compose.compiler:compiler:1.4.7-rc01")
   // kotlinCompilerPluginArgs.add("suppressKotlinVersionCompatibilityCheck=1.8.20") // add this only if you want to use kotlin 1.8.20 instead of 1.8.21
}

[jershell]

i think i have a simular problem.

Unbound public symbol IrSimpleFunctionPublicSymbolImpl: androidx.compose.runtime.saveable/SaveableStateHolder.SaveableStateProvider|453623736503830011[0]

I used compiler:1.4.7-rc01 & kotlin 1.8.21 but i have same error.

[jershell]

Okay i get it. How to reproduce

1. Create a class

package com.pkg

import androidx.compose.runtime.Composable
import androidx.compose.runtime.saveable.SaveableStateHolder

class Foo: SaveableStateHolder {
    @Composable override fun SaveableStateProvider(key: Any, content: @Composable () -> Unit) {
    }

    override fun removeState(key: Any) {
    }
    override fun toString(): String {
        return "bar"
    }
}

2. use it in App.kt.

        var greetingText by remember { mutableStateOf("Hello, World! ${Foo()} ") }

This simple case for overview. I never call SaveableStateHolder inheritance and I get an error message

error: There is still an unbound symbol after generation of IR module <shared>: Unbound public symbol IrSimpleFunctionPublicSymbolImpl: androidx.compose.runtime.saveable/SaveableStateHolder.SaveableStateProvider|453623736503830011[0]

i used

compose {
    kotlinCompilerPlugin.set("org.jetbrains.compose.compiler:compiler:1.4.7-rc01")
    kotlinCompilerPluginArgs.add("suppressKotlinVersionCompatibilityCheck=1.8.21") 
}

its not work for me.

[eymar]

@jershell the problem you're describing is a bit different (it's not about a getter).
It should be fixed in 1.4.1 (not released yet).

---

Does your class need to be public? One of the workarounds is to make it internal if applicable in your case.

[jershell]

@eymar I never call this class. I think some dependency call this class inside. I dont now how to search what a class do it.

[xiaobailong24]

workaround

object Surfaces {
    @Composable
    fun surfaceDim(): Color = Color.Transparent
}

[eymar]

Hey everyone!
The bugs were fixed. Please update to 1.4.1 Compose Multiplatform, and use kotlin 1.8.21 with

compose {
    kotlinCompilerPlugin.set("1.4.7")
}

In the next release, setting kotlinCompilerPlugin.set("1.4.7") won't be necessary.

[igordmn]

Fixed in 1.4.3

[okushnikov]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.