Projects using the no-arg module fail to build in Kotlin 1.6.20

Trying to upgrade my project to 1.6.20 causes the iOS (but not Android) executable to fail. It complains

> Task :mobilemanegesharedmodule:linkDebugFrameworkIos FAILED
e: The symbol of unexpected type encountered during IR deserialization: IrSimpleFunctionPublicSymbolImpl, com.russhwolf.settings/Settings|-62081702699614493[0]. IrClassifierSymbol is expected.

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.

and then

+--- com.russhwolf:multiplatform-settings-no-arg (com.russhwolf:multiplatform-settings-no-arg-iosx64): 0.8.1
|    ^^^ This module contains symbol com.russhwolf.settings/Settings|-62081702699614493[0] that is the cause of the conflict.
|    +--- com.russhwolf:multiplatform-settings (com.russhwolf:multiplatform-settings-iosx64): 0.8.1
|    |    ^^^ This module contains symbol com.russhwolf.settings/Settings|-62081702699614493[0] that is the cause of the conflict.

Seems a little odd since I see you’ve already allowed for HMPP it seems. Perhaps it’s Kermit causing the trouble?

[russhwolf]

I’ve been able to isolate this to an issue in Kotlin 1.6.20 and reported it on Youtrack. You can follow it here: https://youtrack.jetbrains.com/issue/KT-51927

[russhwolf]

I’ve confirmed that you can work around the issue while still using the current published version of the library by disabling compiler optimizations as recommended in the YouTrack ticket above. Add something like this to your gradle file:

kotlin {
    targets.withType<org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget> {
        binaries.all {
            freeCompilerArgs += "-Xlazy-ir-for-caches=disable"
        }
    }
}