gradle-plugin: Support adding interop from other projects

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

@@ -221,7 +221,7 @@ open class KonanCompileConfig(
         if (anotherTask.enableAssertions) enableAssertions()
     }
 
-    private fun useInteropFromConfig(interopConfig: KonanInteropConfig) {
+    fun useInterop(interopConfig: KonanInteropConfig) {
         val generateStubsTask = interopConfig.generateStubsTask
         val compileStubsTask  = interopConfig.compileStubsTask
 
@@ -237,12 +237,18 @@ open class KonanCompileConfig(
         generateStubsTask.manifest ?.let {manifest(it)}
     }
 
-    fun useInterops(interops: ArrayList<String>) {
-        interops.forEach { useInteropFromConfig(project.konanInteropContainer.getByName(it)) }
+    fun useInterop(interop: String) {
+        useInterop(project.konanInteropContainer.getByName(interop))
     }
 
-    fun useInterop(interop: String) {
-        useInteropFromConfig(project.konanInteropContainer.getByName(interop))
+    fun useInterops(interops: Collection<Any>) {
+        interops.forEach {
+            when(it) {
+                is String -> useInterop(project.konanInteropContainer.getByName(it))
+                is KonanInteropConfig -> useInterop(it)
+                else -> throw IllegalArgumentException("Cannot convert the object to an interop description: $it")
+            }
+        }
     }
 
     // DSL. Input/output files

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

@@ -56,8 +56,9 @@ class KonanProject {
     }
 
     /** Creates a file with the given content in project subdirectory specified by parentDirectory. */
-    File createFile(Path parentDirectory, String fileName, String content) {
-        def result = Files.createFile(projectPath.resolve(parentDirectory).resolve(fileName)).toFile()
+    File createFile(Path parentDirectory = projectPath, String fileName, String content) {
+        def result = projectPath.resolve(parentDirectory).resolve(fileName).toFile()
+        result.createNewFile()
         result.write(content)
         return result
     }
@@ -67,11 +68,6 @@ class KonanProject {
         return createFile(Paths.get(*parentPath), fileName, content)
     }
 
-    /** Creates a file with the given content in project root directory. */
-    File createFile(String fileName, String content) {
-        return createFile(projectPath, fileName, content)
-    }
-
     /** Creates a folder for project source files (src/main/kotlin). */
     void generateFolders() {
         createSubDir("src", "main", "kotlin")
@@ -274,7 +270,7 @@ class KonanInteropProject extends KonanProject {
      *
      *  headers = stdio.h stdlib.h string.h
      */
-    File generateDefFile(String fileName) {
+    File generateDefFile(String fileName = "${DEFAULT_INTEROP_NAME}.def") {
         return generateDefFile(fileName, """
             headers = stdio.h stdlib.h string.h
             """.stripIndent()

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

@@ -28,4 +28,30 @@ class TaskSpecification extends BaseKonanSpecification {
         beforeCompilation != null && beforeCompilation.outcome == TaskOutcome.SUCCESS
     }
 
+    def 'Compilation config should work with konanInterop from another project'() {
+        when:
+        def rootProject = KonanProject.create(projectDirectory) { KonanProject it ->
+            it.buildFile.append("evaluationDependsOn(':interop')\n")
+            it.createFile("settings.gradle", "include ':interop'")
+            it.addCompilationSetting("useInterop", "project(':interop').konanInterop['interop']")
+        }
+        def interopProjectDir = rootProject.createSubDir("interop")
+        def interopProject = KonanInteropProject.createEmpty(interopProjectDir) { KonanInteropProject it ->
+            it.generateBuildFile("""
+                apply plugin: 'konan'
+
+                konanInterop {
+                    interop { }
+                }
+            """.stripIndent())
+            it.interopTasks = [":interop:genInteropInteropStubs", ":interop:compileInteropInteropStubs"]
+            it.generateDefFile("interop.def")
+        }
+        def result = rootProject.createRunner().withArguments("build").build()
+
+        then:
+        result.taskPaths(TaskOutcome.SUCCESS).containsAll(rootProject.compilationTasks + interopProject.interopTasks)
+
+    }
+
 }