Use "sourcesJar" task builder for kotlin-reflect sources

buildSrc/src/main/kotlin/artifacts.kt

@@ -74,13 +74,15 @@ fun<T: Jar> Project.runtimeJar(task: T, body: T.() -> Unit = {}): T {
 
 fun Project.runtimeJar(taskName: String = "jar", body: Jar.() -> Unit = {}): Jar = runtimeJar(getOrCreateTask(taskName, body))
 
-fun Project.sourcesJar(body: Jar.() -> Unit = {}): Jar =
+fun Project.sourcesJar(sourceSet: String? = "main", body: Jar.() -> Unit = {}): Jar =
         getOrCreateTask("sourcesJar") {
             duplicatesStrategy = DuplicatesStrategy.EXCLUDE
             classifier = "sources"
             try {
-                project.pluginManager.withPlugin("java-base") {
+                if (sourceSet != null) {
-                    from(project.the<JavaPluginConvention>().sourceSets["main"].allSource)
+                    project.pluginManager.withPlugin("java-base") {
+                        from(project.the<JavaPluginConvention>().sourceSets[sourceSet].allSource)
+                    }
                 }
             } catch (e: UnknownDomainObjectException) {
                 // skip default sources location

libraries/reflect/build.gradle.kts

@@ -198,9 +198,8 @@ val relocateCoreSources by task<Copy> {
 
 tasks.getByName("jar").enabled = false
 
-val relocatedSourcesJar by task<Jar> {
+val sourcesJar = sourcesJar(sourceSet = null) {
     dependsOn(relocateCoreSources)
-    classifier = "sources"
     from(relocatedCoreSrc)
     from("$core/reflection.jvm/src")
 }
@@ -224,11 +223,10 @@ artifacts {
     add(mainJar.name, artifactJar)
     add("runtime", artifactJar)
     add("archives", artifactJar)
-    add("archives", relocatedSourcesJar)
 }
 
 javadocJar()
 
 dist(fromTask = result) {
-    from(relocatedSourcesJar)
+    from(sourcesJar)
 }