Can I configure a Kotlin Multiplatform module in a Gradle plugin? - android-studio

Question

I'm building a project with several Kotlin Multiplatform modules.
As the Gradle documentation suggests, to share configuration between those modules I've created a custom plugin. This plugin is supposed to apply the kotlin-multiplatform plugin and the shared configuration but unfortunately it's unable to resolve the kotlin extension for applying the multiplatform configuration.
My plugin (buildSrc\src\main\kotlin\my.pugin.gradle.kts):
plugins {
kotlin("multiplatform")
}
kotlin {
val hostOs = System.getProperty("os.name")
val isMingwX64 = hostOs.startsWith("Windows")
val nativeTarget = when {
hostOs == "Mac OS X" -> macosX64("native")
hostOs == "Linux" -> linuxX64("native")
isMingwX64 -> mingwX64("native")
else -> throw GradleException("Host OS is not supported in Kotlin/Native.")
}
sourceSets {
val commonMain by getting
val commonTest by getting {
dependencies {
implementation(kotlin("test-common"))
implementation(kotlin("test-annotations-common"))
}
}
}
jvm {
val main by compilations.getting {
kotlinOptions {
jvmTarget = "1.8"
}
}
}
}
The error:
Unresolved reference. None of the following candidates is applicable because of receiver type mismatch:
public fun DependencyHandler.kotlin(module: String, version: String? = ...): Any defined in org.gradle.kotlin.dsl
public fun PluginDependenciesSpec.kotlin(module: String): PluginDependencySpec defined in org.gradle.kotlin.dsl

Answer 1

Apparently, what you need is to add a dependency of the buildSrc on the kotlin-gradle-plugin in buildSrc\build.gradle.kts:
dependencies {
//...
implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version")
//...
}
EDIT: $kotlin_version is unavailable at this scope, you need to specify it explicitly.