[Gradle] Only add 'directly included' source sets to metadata compile tasks

Contrary to platform compilations, metadata based compile tasks
are expected to only compile the directly associated source sets w/o
their dependsOn closure. DependsOn source sets will be represented
as .klib binary dependencies instead.

^KT-54981 Verification Pending

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/KotlinCommonCompilationFactory.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.gradle.plugin.mpp
 
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.DefaultKotlinCompilationFriendPathsResolver
+import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinCompilationSourceSetInclusion
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinCompilationSourceSetsContainer
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.factory.DefaultKotlinCompilationDependencyConfigurationsFactory
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.factory.KotlinCompilationImplFactory
@@ -30,6 +31,14 @@ class KotlinCommonCompilationFactory internal constructor(
                     DefaultKotlinCompilationFriendPathsResolver.AdditionalMetadataFriendArtifactResolver
                 )
             ),
+
+            /*
+            Metadata compilation will only include directly added source sets to the compile task
+             */
+            compilationSourceSetInclusion = KotlinCompilationSourceSetInclusion(
+                addSourcesToCompileTask = KotlinCompilationSourceSetInclusion.AddSourcesWithoutDependsOnClosure()
+            ),
+
             /*
             Metadata compilations are created *because* of a pre-existing SourceSet.
             We therefore can create the container inline

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/compilationImpl/KotlinCompilationSourceSetInclusion.kt

@@ -19,21 +19,16 @@ import org.jetbrains.kotlin.tooling.core.extrasKeyOf
 import org.jetbrains.kotlin.tooling.core.getOrPut
 import java.util.concurrent.Callable
 
-internal interface KotlinCompilationSourceSetInclusion {
-    fun include(compilation: InternalKotlinCompilation<*>, sourceSet: KotlinSourceSet)
-}
-
-internal class DefaultKotlinCompilationSourceSetInclusion(
+internal class KotlinCompilationSourceSetInclusion(
     private val addSourcesToCompileTask: AddSourcesToCompileTask = DefaultAddSourcesToCompileTask
-) : KotlinCompilationSourceSetInclusion {
+) {
 
-    override fun include(compilation: InternalKotlinCompilation<*>, sourceSet: KotlinSourceSet) {
+    fun include(compilation: InternalKotlinCompilation<*>, sourceSet: KotlinSourceSet) {
         /* Check if the source set was already included */
         if (!compilation.includedSourceSets.add(sourceSet)) return
 
         addSourcesToCompileTask.addSources(
-            compilation, sourceSet,
-            addAsCommonSources = lazy {
+            compilation, sourceSet, addAsCommonSources = lazy {
                 compilation.project.kotlinExtension.sourceSets.any { otherSourceSet ->
                     sourceSet in otherSourceSet.dependsOn
                 }
@@ -79,7 +74,7 @@ internal class DefaultKotlinCompilationSourceSetInclusion(
          * to avoid re-processing of unnecessary source sets!
          */
         private val includedSourceSetsKey = extrasKeyOf<MutableSet<KotlinSourceSet>>(
-            DefaultKotlinCompilationSourceSetInclusion::class.java.name
+            KotlinCompilationSourceSetInclusion::class.java.name
         )
 
         val InternalKotlinCompilation<*>.includedSourceSets: MutableSet<KotlinSourceSet>
@@ -89,17 +84,18 @@ internal class DefaultKotlinCompilationSourceSetInclusion(
 
     fun interface AddSourcesToCompileTask {
         fun addSources(compilation: KotlinCompilation<*>, sourceSet: KotlinSourceSet, addAsCommonSources: Lazy<Boolean>)
-
-        companion object {
-            fun composite(vararg elements: AddSourcesToCompileTask?): AddSourcesToCompileTask =
-                CompositeAddSourcesToCompileTask(listOfNotNull(*elements))
-        }
     }
 
-    private class CompositeAddSourcesToCompileTask(private val children: List<AddSourcesToCompileTask>) : AddSourcesToCompileTask {
-        override fun addSources(compilation: KotlinCompilation<*>, sourceSet: KotlinSourceSet, addAsCommonSources: Lazy<Boolean>) {
-            return children.forEach { child -> child.addSources(compilation, sourceSet, addAsCommonSources) }
-        }
+    object DefaultAddSourcesToCompileTask : AddSourcesToCompileTask {
+        override fun addSources(
+            compilation: KotlinCompilation<*>, sourceSet: KotlinSourceSet, addAsCommonSources: Lazy<Boolean>
+        ) = addSourcesToKotlinCompileTask(
+            project = compilation.project,
+            taskName = compilation.compileKotlinTaskName,
+            sourceFileExtensions = sourceSet.customSourceFilesExtensions,
+            addAsCommonSources = addAsCommonSources,
+            sources = { sourceSet.kotlin }
+        )
     }
 
     object NativeAddSourcesToCompileTask : AddSourcesToCompileTask {
@@ -116,15 +112,20 @@ internal class DefaultKotlinCompilationSourceSetInclusion(
         }
     }
 
-    object DefaultAddSourcesToCompileTask : AddSourcesToCompileTask {
-        override fun addSources(
-            compilation: KotlinCompilation<*>, sourceSet: KotlinSourceSet, addAsCommonSources: Lazy<Boolean>
-        ) = addSourcesToKotlinCompileTask(
-            project = compilation.project,
-            taskName = compilation.compileKotlinTaskName,
-            sourceFileExtensions = sourceSet.customSourceFilesExtensions,
-            addAsCommonSources = addAsCommonSources,
-            sources = { sourceSet.kotlin }
-        )
+    /**
+     * Will use the [delegate] to add sources to the compile task only if the source set was added directly to the compilation
+     * (not if the source set is just part of the dependsOn closure).
+     *
+     * This is necessary for metadata compilations, where dependsOn source sets will be binary dependencies.
+     * In contrast: Platform compilations (jvm, android, linuxX64, ...) will add *all* sources to the compile task
+     * and compiles them together.
+     */
+    class AddSourcesWithoutDependsOnClosure(
+        private val delegate: AddSourcesToCompileTask = DefaultAddSourcesToCompileTask
+    ) : AddSourcesToCompileTask {
+        override fun addSources(compilation: KotlinCompilation<*>, sourceSet: KotlinSourceSet, addAsCommonSources: Lazy<Boolean>) {
+            if (sourceSet !in compilation.kotlinSourceSets) return
+            delegate.addSources(compilation, sourceSet, addAsCommonSources)
+        }
     }
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/compilationImpl/factory/KotlinCompilationImplFactory.kt

@@ -30,7 +30,7 @@ internal class KotlinCompilationImplFactory(
         DefaultKotlinCompilationFriendPathsResolver(),
 
     private val compilationSourceSetInclusion: KotlinCompilationSourceSetInclusion =
-        DefaultKotlinCompilationSourceSetInclusion(),
+        KotlinCompilationSourceSetInclusion(),
 
     private val compilationOutputFactory: KotlinCompilationOutputFactory =
         DefaultKotlinCompilationOutputFactory,

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/KotlinNativeCompilationFactory.kt

@@ -6,7 +6,7 @@
 @file:Suppress("PackageDirectoryMismatch") // Old package for compatibility
 package org.jetbrains.kotlin.gradle.plugin.mpp
 
-import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.DefaultKotlinCompilationSourceSetInclusion
+import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinCompilationSourceSetInclusion
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinNativeCompilationAssociator
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.factory.KotlinCompilationImplFactory
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.factory.KotlinNativeCompilerOptionsFactory
@@ -26,8 +26,8 @@ open class KotlinNativeCompilationFactory internal constructor(
             compilationDependencyConfigurationsFactory = NativeKotlinCompilationDependencyConfigurationsFactory,
             compilerOptionsFactory = KotlinNativeCompilerOptionsFactory,
             compilationAssociator = KotlinNativeCompilationAssociator,
-            compilationSourceSetInclusion = DefaultKotlinCompilationSourceSetInclusion(
-                DefaultKotlinCompilationSourceSetInclusion.NativeAddSourcesToCompileTask
+            compilationSourceSetInclusion = KotlinCompilationSourceSetInclusion(
+                KotlinCompilationSourceSetInclusion.NativeAddSourcesToCompileTask
             ),
         )
 

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/KotlinSharedNativeCompilationFactory.kt

@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.gradle.plugin.mpp
 
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.DefaultKotlinCompilationFriendPathsResolver
-import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.DefaultKotlinCompilationSourceSetInclusion
+import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinCompilationSourceSetInclusion
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinCompilationSourceSetsContainer
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.KotlinNativeCompilationAssociator
 import org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.factory.DefaultKotlinCompilationDependencyConfigurationsFactory
@@ -31,8 +31,13 @@ open class KotlinSharedNativeCompilationFactory internal constructor(
             compilerOptionsFactory = KotlinNativeCompilerOptionsFactory,
             compilationAssociator = KotlinNativeCompilationAssociator,
 
-            compilationSourceSetInclusion = DefaultKotlinCompilationSourceSetInclusion(
-                DefaultKotlinCompilationSourceSetInclusion.NativeAddSourcesToCompileTask
+            /*
+            Metadata compilation will only include directly added source sets to the compile task
+             */
+            compilationSourceSetInclusion = KotlinCompilationSourceSetInclusion(
+                addSourcesToCompileTask = KotlinCompilationSourceSetInclusion.AddSourcesWithoutDependsOnClosure(
+                    KotlinCompilationSourceSetInclusion.NativeAddSourcesToCompileTask
+                )
             ),
 
             compilationFriendPathsResolver = DefaultKotlinCompilationFriendPathsResolver(

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/KotlinCompileTaskSourcesTest.kt

@@ -0,0 +1,134 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+@file:Suppress("FunctionName")
+
+package org.jetbrains.kotlin.gradle
+
+import org.gradle.api.Project
+import org.jetbrains.kotlin.gradle.dsl.multiplatformExtension
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinCommonCompilation
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinSharedNativeCompilation
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompileCommon
+import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
+import org.jetbrains.kotlin.gradle.tasks.KotlinNativeCompile
+import java.io.File
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class KotlinCompileTaskSourcesTest {
+
+    @Test
+    fun `test - sources - shared native compile - KT-54995`() {
+        val project = buildProjectWithMPP()
+        val kotlin = project.multiplatformExtension
+        kotlin.targetHierarchy.default()
+
+        kotlin.linuxX64()
+        kotlin.linuxArm64()
+        kotlin.jvm()
+
+        val commonMainSourceFile = project.file("src/commonMain/kotlin/CommonMain.kt")
+        val linuxMainSourceFile = project.file("src/linuxMain/kotlin/LinuxMain.kt")
+
+        commonMainSourceFile.parentFile.mkdirs()
+        linuxMainSourceFile.parentFile.mkdirs()
+
+        commonMainSourceFile.writeText("object CommonMain")
+        linuxMainSourceFile.writeText("object LinuxMain")
+
+        project.evaluate()
+
+        /* Check sources of linuxMain compilation */
+        val linuxMainCompilation = kotlin.metadata().compilations.getByName("linuxMain") as KotlinSharedNativeCompilation
+        val linuxMainCompileTask = linuxMainCompilation.compileTaskProvider.get()
+
+        assertEquals(
+            setOf(linuxMainSourceFile).relativeTo(project),
+            linuxMainCompileTask.sources.files.relativeTo(project)
+        )
+
+        /* Check sources of commonMain compilation */
+        val commonMainCompilation = kotlin.metadata().compilations.getByName("commonMain") as KotlinCommonCompilation
+        val commonMainCompileTask = commonMainCompilation.compileTaskProvider.get() as KotlinCompileCommon
+
+        assertEquals(
+            setOf(commonMainSourceFile).relativeTo(project),
+            commonMainCompileTask.sources.files.relativeTo(project)
+        )
+    }
+
+    @Test
+    fun `test - sources - linux and jvm`() {
+        val project = buildProjectWithMPP()
+        val kotlin = project.multiplatformExtension
+        kotlin.targetHierarchy.default {
+            common {
+                group("jvmAndLinux") {
+                    anyLinux()
+                    jvm()
+                }
+            }
+        }
+
+        kotlin.linuxArm64()
+        kotlin.jvm()
+
+        val commonMainSourceFile = project.file("src/commonMain/kotlin/Common.kt")
+        val jvmAndLinuxMainSourceFile = project.file("src/jvmAndLinuxMain/kotlin/JvmAndLinuxMain.kt")
+        val linuxArm64MainSourceFile = project.file("src/linuxArm64Main/kotlin/Linux.kt")
+        val jvmMainSourceFile = project.file("src/jvmMain/kotlin/Jvm.kt")
+
+        commonMainSourceFile.parentFile.mkdirs()
+        jvmAndLinuxMainSourceFile.parentFile.mkdirs()
+        linuxArm64MainSourceFile.parentFile.mkdirs()
+        jvmMainSourceFile.parentFile.mkdirs()
+
+        commonMainSourceFile.writeText("object CommonMain")
+        jvmAndLinuxMainSourceFile.writeText("object JvmAndLinuxMain")
+        linuxArm64MainSourceFile.writeText("object Linux")
+        jvmMainSourceFile.writeText("object Jvm")
+
+        project.evaluate()
+
+        /* Check sources of commonMain compile task */
+        val commonMainCompileTask = kotlin.metadata().compilations.getByName("commonMain")
+            .compileTaskProvider.get() as KotlinCompileCommon
+
+        assertEquals(
+            setOf(commonMainSourceFile).relativeTo(project),
+            commonMainCompileTask.sources.files.relativeTo(project)
+        )
+
+        /* Check sources of jvmAndLinuxMain compile task */
+        val jvmAndLinuxMainCompileTask = kotlin.metadata().compilations.getByName("jvmAndLinuxMain")
+            .compileTaskProvider.get() as KotlinCompileCommon
+
+        assertEquals(
+            setOf(jvmAndLinuxMainSourceFile).relativeTo(project),
+            jvmAndLinuxMainCompileTask.sources.files.relativeTo(project)
+        )
+
+        /* Check sources of jvm compile task */
+        val jvmMainCompileTask = kotlin.jvm().compilations.getByName("main")
+            .compileTaskProvider.get() as KotlinJvmCompile
+
+        assertEquals(
+            setOf(commonMainSourceFile, jvmAndLinuxMainSourceFile, jvmMainSourceFile).relativeTo(project),
+            jvmMainCompileTask.sources.files.relativeTo(project)
+        )
+
+        /* Check sources of linuxArm64 compile task */
+        val linuxArm64CompileTask = kotlin.linuxArm64().compilations.getByName("main")
+            .compileTaskProvider.get() as KotlinNativeCompile
+
+        assertEquals(
+            setOf(commonMainSourceFile, jvmAndLinuxMainSourceFile, linuxArm64MainSourceFile).relativeTo(project),
+            linuxArm64CompileTask.sources.files.relativeTo(project)
+        )
+    }
+
+    private fun Set<File>.relativeTo(project: Project): Set<File> = map { it.relativeTo(project.projectDir) }.toSet()
+}