Support custom entry points for native binaries

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/kotlinCompilations.kt

@@ -319,6 +319,9 @@ class KotlinNativeCompilation(
         }.toMutableList()
     }
 
+    var entryPoint: String? = null
+    fun entryPoint(value: String) { entryPoint = value }
+
     // Naming
 
     override val compileDependencyConfigurationName: String

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/KotlinNativeTasks.kt

@@ -77,6 +77,9 @@ open class KotlinNativeCompile : AbstractCompile() {
     val target: String
         @Input get() = compilation.target.konanTarget.name
 
+    val entryPoint: String?
+        @Optional @Input get() = compilation.entryPoint
+
     val additionalCompilerOptions: Collection<String>
         @Input get() = compilation.extraOpts
 
@@ -174,6 +177,7 @@ open class KotlinNativeCompile : AbstractCompile() {
 
             addArg("-target", target)
             addArg("-p", outputKind.name.toLowerCase())
+            addArgIfNotNull("-entry", entryPoint)
 
             add("-Xmulti-platform")