Extract classpath from KotlinSharedNativeCompilation as well (#2664)

* Extract classpath from `KotlinSharedNativeCompilation` as well

* Enhance mpp integration test

* Enable HMPP for old Kotlin in integration test

* Add comments

Author: vmishenev

integration-tests/gradle/projects/it-multiplatform-0/build.gradle.kts

@@ -14,6 +14,14 @@ kotlin {
     macosX64("macos")
     js()
     sourceSets {
+        val commonMain by sourceSets.getting
+        val linuxMain by sourceSets.getting
+        val macosMain by sourceSets.getting
+        val desktopMain by sourceSets.creating {
+            dependsOn(commonMain)
+            linuxMain.dependsOn(this)
+            macosMain.dependsOn(this)
+        }
         named("commonMain") {
             dependencies {
                 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9")
@@ -26,8 +34,8 @@ tasks.withType<DokkaTask>().configureEach {
     dokkaSourceSets {
         configureEach {
             externalDocumentationLink {
-                url.set(URL("https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/"))
-                //packageListUrl.set(URL("https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/package-list"))
+                url.set(URL("https://kotlinlang.org/api/kotlinx.coroutines/"))
+                //packageListUrl.set(URL("https://kotlinlang.org/api/kotlinx.coroutines/package-list"))
             }
         }
     }

integration-tests/gradle/projects/it-multiplatform-0/gradle.properties

@@ -1 +1,5 @@
 dokka_it_kotlin_version=1.7.10
+#these flags are enabled by default since 1.6.20.
+#remove when this test is executed with Kotlin >= 1.6.20
+kotlin.mpp.enableGranularSourceSetsMetadata=true
+kotlin.native.enableDependencyPropagation=false

integration-tests/gradle/projects/it-multiplatform-0/src/desktopMain/kotlin/it/mpp0/CPointerExtension.kt

@@ -0,0 +1,11 @@
+package it.mpp0
+
+import kotlinx.cinterop.CPointed
+import kotlinx.cinterop.CPointer
+
+/**
+ * Will print the raw value
+ */
+fun CPointer<CPointed>.customExtension() {
+    println(this.rawValue)
+}

integration-tests/gradle/projects/it-multiplatform-0/src/desktopMain/kotlin/it/mpp0/ExpectedClass.kt

@@ -0,0 +1,5 @@
+package it.mpp0
+
+actual class ExpectedClass {
+    actual val platform: String = "linux"
+}

runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/kotlin/kotlinClasspathUtils.kt

@@ -5,7 +5,7 @@ import org.gradle.api.file.FileCollection
 import org.jetbrains.dokka.gradle.isAndroidTarget
 import org.jetbrains.dokka.utilities.cast
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
-import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeCompilation
+import org.jetbrains.kotlin.gradle.plugin.mpp.AbstractKotlinNativeCompilation
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinCommonCompilation
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
@@ -42,7 +42,7 @@ private fun Project.compileClasspathOf(compilation: KotlinCompilation): FileColl
         return compilation.compileKotlinTask.cast<KotlinCompile>().classpath
     }
 
-    val platformDependencyFiles: FileCollection = (compilation as? KotlinNativeCompilation)
+    val platformDependencyFiles: FileCollection = (compilation as? AbstractKotlinNativeCompilation)
         ?.target?.project?.configurations
         ?.findByName(compilation.defaultSourceSet.implementationMetadataConfigurationName)
         ?: files()