Fix publishing dependencies of Android libraries (KT-29476)

* Add the extendsFrom relation between the Kotlin MPP compilation's
  configurations (`*Api`, `*Implementation`, `*RuntimeOnly`) and
  the Android variant's `*Elements` configurations, as those
  dependencies currently are not added to the Android source sets and
  are thus missing from the published dependencies.

* Fix a `this is KotlinCompilationToRunnableFiles` check that
  mistakenly referenced the Project receiver of `whenEvaluated { ... }`

Issue #KT-29476 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/AbstractKotlinAndroidGradleTests.kt

@@ -140,6 +140,8 @@ class KotlinAndroid32GradleIT : KotlinAndroid3GradleIT(androidGradlePluginVersio
 
         // Convert the 'app' project to a library, publish the two without metadata,
         // check that the dependencies in the POMs are correctly rewritten:
+        val appGroupDir = "app/build/repo/com/example/"
+
         gradleSettingsScript().modify { it.replace("enableFeaturePreview", "//") }
         gradleBuildScript("app").modify {
             it.replace("com.android.application", "com.android.library")
@@ -152,19 +154,47 @@ class KotlinAndroid32GradleIT : KotlinAndroid3GradleIT(androidGradlePluginVersio
         }
         build("publish") {
             assertSuccessful()
-            val appGroupDir = "app/build/repo/com/example/"
             listOf("foobar", "foobaz").forEach { flavor ->
                 listOf("-debug", "").forEach { buildType ->
                     assertFileExists(appGroupDir + "app-androidapp-$flavor$buildType/1.0/app-androidapp-$flavor$buildType-1.0.aar")
                     assertFileExists(appGroupDir + "app-androidapp-$flavor$buildType/1.0/app-androidapp-$flavor$buildType-1.0-sources.jar")
                     val pomText = projectDir.resolve(
                         appGroupDir + "app-androidapp-$flavor$buildType/1.0/app-androidapp-$flavor$buildType-1.0.pom"
-                    ).readText()
-                    assertTrue { "<artifactId>lib-androidlib-$flavor$buildType</artifactId>" in pomText }
+                    ).readText().replace("\\s+".toRegex(), "")
+                    assertTrue {
+                        "<artifactId>lib-androidlib-$flavor$buildType</artifactId><version>1.0</version><scope>runtime</scope>" in pomText
+                    }
                 }
             }
             projectDir.resolve(groupDir).deleteRecursively()
         }
+
+        // Also check that api and runtimeOnly MPP dependencies get correctly published with the appropriate scope, KT-29476:
+        gradleBuildScript("app").modify {
+            it.replace("implementation project(':lib')", "api project(':lib')") + "\n" + """
+                kotlin.sourceSets.commonMain.dependencies {
+                    runtimeOnly(kotlin('reflect'))
+                }
+            """.trimIndent()
+        }
+        build("publish") {
+            assertSuccessful()
+            listOf("foobar", "foobaz").forEach { flavor ->
+                listOf("-debug", "").forEach { buildType ->
+                    val pomText = projectDir.resolve(
+                        appGroupDir + "app-androidapp-$flavor$buildType/1.0/app-androidapp-$flavor$buildType-1.0.pom"
+                    ).readText().replace("\\s+".toRegex(), "")
+                    assertTrue {
+                        "<artifactId>lib-androidlib-$flavor$buildType</artifactId><version>1.0</version><scope>compile</scope>" in pomText
+                    }
+                    assertTrue {
+                        val kotlinVersion = defaultBuildOptions().kotlinVersion
+                        "<artifactId>kotlin-reflect</artifactId><version>$kotlinVersion</version><scope>runtime</scope>" in pomText
+                    }
+                }
+            }
+        }
+
     }
 
     @Test

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/android/Android25ProjectHandler.kt

@@ -146,6 +146,16 @@ class Android25ProjectHandler(
         // We should request such API in the Android plugin
         val apiElementsConfigurationName = "${variant.name}ApiElements"
         val runtimeElementsConfigurationName = "${variant.name}RuntimeElements"
+
+        // KT-29476, the Android *Elements configurations need Kotlin MPP dependencies:
+        if (project.configurations.findByName(apiElementsConfigurationName) != null) {
+            project.addExtendsFromRelation(apiElementsConfigurationName, compilation.apiConfigurationName)
+        }
+        if (project.configurations.findByName(runtimeElementsConfigurationName) != null) {
+            project.addExtendsFromRelation(runtimeElementsConfigurationName, compilation.implementationConfigurationName)
+            project.addExtendsFromRelation(runtimeElementsConfigurationName, compilation.runtimeOnlyConfigurationName)
+        }
+
         listOf(apiElementsConfigurationName, runtimeElementsConfigurationName).forEach { outputConfigurationName ->
             project.configurations.findByName(outputConfigurationName)?.usesPlatformOf(compilation.target)
         }

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

@@ -104,35 +104,33 @@ abstract class AbstractKotlinCompilation<T : KotlinCommonOptions>(
 
     override fun source(sourceSet: KotlinSourceSet) {
         if (kotlinSourceSets.add(sourceSet)) {
-            with(target.project) {
-                //TODO possibly issue with forced instantiation
-                whenEvaluated {
-                    sourceSet.getSourceSetHierarchy().forEach { sourceSet ->
-                        val isCommonSource =
-                            CompilationSourceSetUtil.sourceSetsInMultipleCompilations(project)?.contains(sourceSet) ?: false
+            //TODO possibly issue with forced instantiation
+            target.project.whenEvaluated {
+                sourceSet.getSourceSetHierarchy().forEach { sourceSet ->
+                    val isCommonSource =
+                        CompilationSourceSetUtil.sourceSetsInMultipleCompilations(project)?.contains(sourceSet) ?: false
 
-                        addSourcesToCompileTask(sourceSet, addAsCommonSources = isCommonSource)
+                    addSourcesToCompileTask(sourceSet, addAsCommonSources = isCommonSource)
 
-                        // Use `forced = false` since `api`, `implementation`, and `compileOnly` may be missing in some cases like
-                        // old Java & Android projects:
-                        addExtendsFromRelation(apiConfigurationName, sourceSet.apiConfigurationName, forced = false)
-                        addExtendsFromRelation(implementationConfigurationName, sourceSet.implementationConfigurationName, forced = false)
-                        addExtendsFromRelation(compileOnlyConfigurationName, sourceSet.compileOnlyConfigurationName, forced = false)
+                    // Use `forced = false` since `api`, `implementation`, and `compileOnly` may be missing in some cases like
+                    // old Java & Android projects:
+                    addExtendsFromRelation(apiConfigurationName, sourceSet.apiConfigurationName, forced = false)
+                    addExtendsFromRelation(implementationConfigurationName, sourceSet.implementationConfigurationName, forced = false)
+                    addExtendsFromRelation(compileOnlyConfigurationName, sourceSet.compileOnlyConfigurationName, forced = false)
 
-                        if (this is KotlinCompilationToRunnableFiles<*>) {
-                            addExtendsFromRelation(runtimeOnlyConfigurationName, sourceSet.runtimeOnlyConfigurationName, forced = false)
-                        }
+                    if (this@AbstractKotlinCompilation is KotlinCompilationToRunnableFiles<*>) {
+                        addExtendsFromRelation(runtimeOnlyConfigurationName, sourceSet.runtimeOnlyConfigurationName, forced = false)
+                    }
 
-                        if (sourceSet.name != defaultSourceSetName) {
-                            kotlinExtension.sourceSets.findByName(defaultSourceSetName)?.let { defaultSourceSet ->
-                                // Temporary solution for checking consistency across source sets participating in a compilation that may
-                                // not be interconnected with the dependsOn relation: check the settings as if the default source set of
-                                // the compilation depends on the one added to the compilation:
-                                defaultSourceSetLanguageSettingsChecker.runAllChecks(
-                                    defaultSourceSet,
-                                    sourceSet
-                                )
-                            }
+                    if (sourceSet.name != defaultSourceSetName) {
+                        kotlinExtension.sourceSets.findByName(defaultSourceSetName)?.let { defaultSourceSet ->
+                            // Temporary solution for checking consistency across source sets participating in a compilation that may
+                            // not be interconnected with the dependsOn relation: check the settings as if the default source set of
+                            // the compilation depends on the one added to the compilation:
+                            defaultSourceSetLanguageSettingsChecker.runAllChecks(
+                                defaultSourceSet,
+                                sourceSet
+                            )
                         }
                     }
                 }