Support -Xstatic-framework in DSL

In Kotlin/Native 1.3.30 EAP1 an ability to build
a static ObjC framework has been added. This patch
adds support for this feature in the kotlin-multiplatform
plugin.

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

@@ -990,12 +990,13 @@ class NewMultiplatformIT : BaseGradleIT() {
                 }
             }
 
-            // Check manual disabling bitcode embedding and custom command line args.
+            // Check manual disabling bitcode embedding, custom command line args and building a static framework.
             build("linkCustomReleaseFrameworkIos") {
                 assertSuccessful()
                 checkFrameworkCompilationCommandLine {
                     assertTrue(it.contains("-linker-options -L."))
                     assertTrue(it.contains("-Xtime"))
+                    assertTrue(it.contains("-Xstatic-framework"))
                     assertFalse(it.contains("-Xembed-bitcode-marker"))
                     assertFalse(it.contains("-Xembed-bitcode"))
                 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/new-mpp-native-binaries/groovy-dsl/build.gradle

@@ -73,6 +73,7 @@ kotlin {
                     embedBitcode = 'DISABLE'
                     linkerOpts = ['-L.']
                     freeCompilerArgs = ["-Xtime"]
+                    isStatic = true
                 }
             }
         }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/new-mpp-native-binaries/kotlin-dsl/build.gradle.kts

@@ -65,6 +65,7 @@ kotlin {
                 embedBitcode("disable")
                 linkerOpts = mutableListOf("-L.")
                 freeCompilerArgs = mutableListOf("-Xtime")
+                isStatic = true
             }
         }
     }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/cocoapods/KotlinCocoapodsPlugin.kt

@@ -102,8 +102,7 @@ open class KotlinCocoapodsPlugin: Plugin<Project> {
     private fun createDefaultFrameworks(kotlinExtension: KotlinMultiplatformExtension) {
         kotlinExtension.supportedTargets().all { target ->
             target.binaries.framework {
-                // TODO: Add in the framework DSL.
-                this.freeCompilerArgs.add("-Xstatic-framework")
+                isStatic = true
             }
         }
     }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/NativeBinaries.kt

@@ -234,6 +234,11 @@ class Framework(
      */
     fun embedBitcode(mode: String) = embedBitcode(BitcodeEmbeddingMode.valueOf(mode.toUpperCase()))
 
+    /**
+     * Specifies if the framework is linked as a static library (false by default).
+     */
+    var isStatic = false
+
     enum class BitcodeEmbeddingMode {
         /** Don't embed LLVM IR bitcode. */
         DISABLE,

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

@@ -370,6 +370,10 @@ open class KotlinNativeLink : AbstractKotlinNativeCompile() {
             }
         }
 
+    @get:Input
+    val isStaticFramework: Boolean
+        get() = binary.let { it is Framework && it.isStatic }
+
     @get:Input
     val embedBitcode: Framework.BitcodeEmbeddingMode
         get() = (binary as? Framework)?.embedBitcode ?: Framework.BitcodeEmbeddingMode.DISABLE
@@ -392,6 +396,7 @@ open class KotlinNativeLink : AbstractKotlinNativeCompile() {
             exportLibraries.files.filterExternalKlibs(project).forEach {
                 add("-Xexport-library=${it.absolutePath}")
             }
+            addKey("-Xstatic-framework", isStaticFramework)
             addAll(freeCompilerArgs)
         }
     }