How to use cinterop in Kotlin Multiplatform Mobile projects

Question

I want to integrate C code into a Kotlin Multiplatform Mobile project using the cinterop tool. I already spent some time on the documentation on Kotlin Multiplatform and Kotlin/Native but I can't seem to get it working.

Here is my build.gradle.kts:

kotlin {
    android {
        publishLibraryVariants("release", "debug")
        publishLibraryVariantsGroupedByFlavor = true
    }
    ios()

    androidNativeArm32 {
        compilations.getByName("main") {
            val myInterop by cinterops.creating {
                defFile(project.file("foobar.def"))
                packageName("org.sample")
            }
        }
    }

    ...
}

I want to do the same for the native iOS part.

Watching the gradle output, it seems to me that the cinterop configuration is completely ignored. It doesn't matter whether the def file exists or not. It does not make a difference.

Sorry, if I miss the obvious here. I am a bit confused by all the different Kotlin extensions and especially how they are supposed to work together.

What am I missing in my configuration? Is it even possible to use cinterop in a KMM project.