I’m trying to mock some expect/`actual` types with a KSP plugin, but the

actual

type on iOS requires an

@OptIn(ExperimentalForeignApi::class)

annotation on one method. I can do this with

sourceSets {
  all {
    languageSettings.optIn("kotlinx.cinterop.ExperimentalForeignApi")
  }
}

However, this seems wrong. I really only need to do this for the test sources, which are generated by KSP. How do I add this compiler flag just for compiling the test source set on iOS?