Review fixes: prohibit setting classpath, use lazy provider for destination dir

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/plugins/KotlinNativeBasePlugin.kt

@@ -34,6 +34,7 @@ import org.gradle.util.GradleVersion
 import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments
 import org.jetbrains.kotlin.gradle.plugin.*
 import org.jetbrains.kotlin.gradle.plugin.experimental.*
+import org.jetbrains.kotlin.gradle.plugin.experimental.CInteropSettings
 import org.jetbrains.kotlin.gradle.plugin.experimental.internal.*
 import org.jetbrains.kotlin.gradle.plugin.experimental.tasks.CInteropTask
 import org.jetbrains.kotlin.gradle.plugin.experimental.tasks.KotlinNativeCompile

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/tasks/KotlinNativeCompile.kt

@@ -56,6 +56,12 @@ open class KotlinNativeCompile @Inject constructor(internal val binary: Abstract
     val libraries: Configuration
         @InputFiles get() = binary.klibraries
 
+    override fun getClasspath(): FileCollection = libraries
+
+    override fun setClasspath(configuration: FileCollection?) {
+        throw UnsupportedOperationException("Use klibraries to set compile classpath in Kotlin/Native")
+    }
+
     val optimized:  Boolean @Input get() = binary.optimized
     val debuggable: Boolean @Input get() = binary.debuggable
 
@@ -114,8 +120,10 @@ open class KotlinNativeCompile @Inject constructor(internal val binary: Abstract
 
     // initializing AbstractCompile properties
     init {
-        classpath = libraries
-        destinationDir = if (outputFile.isDirectory) outputFile else outputFile.parentFile
+        @Suppress("LeakingThis")
+        setDestinationDir(project.provider {
+            if (outputFile.isDirectory) outputFile else outputFile.parentFile
+        })
         sourceCompatibility = "1.6"
         targetCompatibility = "1.6"
     }