[Gradle, JS] Use include instead of sources for link stage of compiler

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/CompilerFlags.kt

@@ -9,6 +9,8 @@ package org.jetbrains.kotlin.gradle.targets.js.ir
  * @see [compiler/testData/cli/js/jsExtraHelp.out]
  */
 
+const val ENTRY_IR_MODULE = "-Xinclude"
+
 const val DISABLE_PRE_IR = "-Xir-only"
 const val ENABLE_DCE = "-Xir-dce"
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrLink.kt

@@ -7,13 +7,12 @@ package org.jetbrains.kotlin.gradle.targets.js.ir
 
 import org.gradle.api.file.FileTree
 import org.gradle.api.file.RegularFileProperty
-import org.gradle.api.tasks.Input
-import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.*
+import org.gradle.api.tasks.incremental.IncrementalTaskInputs
 import org.jetbrains.kotlin.gradle.dsl.KotlinJsOptions
 import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrType.DEVELOPMENT
 import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrType.PRODUCTION
 import org.jetbrains.kotlin.gradle.tasks.Kotlin2JsCompile
-import org.jetbrains.kotlin.gradle.tasks.SourceRoots
 import org.jetbrains.kotlin.gradle.utils.newFileProperty
 import java.io.File
 
@@ -21,10 +20,22 @@ open class KotlinJsIrLink : Kotlin2JsCompile() {
     @Input
     lateinit var type: KotlinJsIrType
 
-    override fun getSourceRoots() = SourceRoots.KotlinOnly.create(
-        emptyList<File>() as FileTree,
-        emptyList()
-    )
+    @Internal
+    override fun getSource(): FileTree = super.getSource()
+
+    @get:SkipWhenEmpty
+    @get:InputDirectory
+    val entryModule: File
+        get() = File(
+            (taskData.compilation as KotlinJsIrCompilation)
+                .output
+                .classesDirs
+                .asPath
+        )
+
+    override fun skipCondition(inputs: IncrementalTaskInputs): Boolean {
+        return !inputs.isIncremental && !entryModule.exists()
+    }
 
     @OutputFile
     val outputFileProperty: RegularFileProperty = project.newFileProperty {
@@ -43,7 +54,9 @@ open class KotlinJsIrLink : Kotlin2JsCompile() {
     }
 
     private fun KotlinJsOptions.configureOptions(vararg additionalCompilerArgs: String) {
-        freeCompilerArgs += additionalCompilerArgs.toList() + PRODUCE_JS
+        freeCompilerArgs += additionalCompilerArgs.toList() +
+                PRODUCE_JS +
+                "$ENTRY_IR_MODULE=${entryModule.canonicalPath}"
     }
 }
 

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

@@ -24,7 +24,6 @@ import org.jetbrains.kotlin.daemon.common.MultiModuleICSettings
 import org.jetbrains.kotlin.gradle.dsl.*
 import org.jetbrains.kotlin.gradle.incremental.ChangedFiles
 import org.jetbrains.kotlin.gradle.internal.*
-import org.jetbrains.kotlin.gradle.internal.prepareCompilerArguments
 import org.jetbrains.kotlin.gradle.internal.tasks.TaskWithLocalState
 import org.jetbrains.kotlin.gradle.internal.tasks.allOutputFiles
 import org.jetbrains.kotlin.gradle.logging.*
@@ -286,6 +285,10 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractKo
         }
     }
 
+    protected open fun skipCondition(inputs: IncrementalTaskInputs): Boolean {
+        return !inputs.isIncremental && getSourceRoots().kotlinSourceFiles.isEmpty()
+    }
+
     private fun executeImpl(inputs: IncrementalTaskInputs) {
         // Check that the JDK tools are available in Gradle (fail-fast, instead of a fail during the compiler run):
         findToolsJar()
@@ -295,7 +298,7 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractKo
 
         logger.kotlinDebug { "All kotlin sources: ${allKotlinSources.pathsAsStringRelativeTo(project.rootProject.projectDir)}" }
 
-        if (!inputs.isIncremental && allKotlinSources.isEmpty()) {
+        if (skipCondition(inputs)) {
             // Skip running only if non-incremental run. Otherwise, we may need to do some cleanup.
             logger.kotlinDebug { "No Kotlin files found, skipping Kotlin compiler task" }
             return