gradle-plugin: Support custom entry point

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KonanCompileConfig.kt

@@ -61,6 +61,8 @@ abstract class KonanCompileConfig<T: KonanCompileTask>(name: String,
     override fun enableOptimizations(flag: Boolean) = forEach { it.enableOptimizations(flag) }
     override fun enableAssertions(flag: Boolean) = forEach { it.enableAssertions(flag) }
 
+    override fun entryPoint(entryPoint: String) = forEach { it.entryPoint(entryPoint) }
+
     override fun measureTime(flag: Boolean) = forEach { it.measureTime(flag) }
 }
 

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KonanSpecs.kt

@@ -62,6 +62,8 @@ interface KonanCompileSpec: KonanBuildingSpec {
     fun enableOptimizations(flag: Boolean)
     fun enableAssertions(flag: Boolean)
 
+    fun entryPoint(entryPoint: String)
+
     fun measureTime(flag: Boolean)
 }
 

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

@@ -61,6 +61,9 @@ abstract class KonanCompileTask: KonanBuildingTask(), KonanCompileSpec {
     @Input var noMain              = false
     @Input var enableOptimizations = false
     @Input var enableAssertions    = false
+
+    @Optional @Input var entryPoint: String? = null
+
     @Console var measureTime       = false
 
     val languageVersion : String?
@@ -87,6 +90,7 @@ abstract class KonanCompileTask: KonanBuildingTask(), KonanCompileSpec {
         addArgIfNotNull("-target", konanTarget.userName)
         addArgIfNotNull("-language-version", languageVersion)
         addArgIfNotNull("-api-version", apiVersion)
+        addArgIfNotNull("-entry", entryPoint)
 
         addKey("-g", enableDebug)
         addKey("-nostdlib", noStdLib)
@@ -146,13 +150,17 @@ abstract class KonanCompileTask: KonanBuildingTask(), KonanCompileSpec {
     }
 
     override fun enableOptimizations(flag: Boolean) {
-        enableOptimizations = true
+        enableOptimizations = flag
     }
 
     override fun enableAssertions(flag: Boolean) {
         enableAssertions = flag
     }
 
+    override fun entryPoint(entryPoint: String) {
+        this.entryPoint = entryPoint
+    }
+
     override fun measureTime(flag: Boolean) {
         measureTime = flag
     }

tools/kotlin-native-gradle-plugin/src/test/groovy/org/jetbrains/kotlin/gradle/plugin/test/IncrementalSpecification.groovy

@@ -97,6 +97,28 @@ class IncrementalSpecification extends BaseKonanSpecification {
         "noDefaultLibs"       | "true"
     }
 
+    def 'Plugin should support custom entry points and recompile an artifact if it changes'() {
+        when:
+        def project = KonanProject.createEmpty(projectDirectory) { KonanProject it ->
+            it.addCompilerArtifact("main", """
+                |fun main(args: Array<String>) { println("default main") }
+                |
+            """.stripMargin())
+        }
+        def results = buildTwice(project) { KonanProject it ->
+            it.srcFiles[0].write("""
+                |package foo
+                |
+                |fun bar(args: Array<String>) { println("changed main") }
+                |
+            """.stripMargin())
+            it.addSetting("main", "entryPoint", "'foo.bar'")
+        }
+
+        then:
+        onlyRecompilationHappened(*results)
+    }
+
     def 'srcFiles change for a compilation task should cause only recompilation'() {
         when:
         def project = KonanProject.createWithInterop(projectDirectory, ArtifactType.LIBRARY) { KonanProject it ->