Merge pull request #794 from square/rick/kmp_convention_plugin

Add a convention plugin for kotlin-multiplatform

Author: RBusarow

buildSrc/src/main/java/kotlin-multiplatform.gradle.kts

@@ -0,0 +1,19 @@
+import com.squareup.workflow1.buildsrc.kotlinCommonSettings
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+  kotlin("multiplatform")
+}
+
+extensions.getByType(JavaPluginExtension::class).apply {
+  sourceCompatibility = JavaVersion.VERSION_1_8
+  targetCompatibility = JavaVersion.VERSION_1_8
+}
+
+tasks.withType<KotlinCompile> {
+  kotlinOptions {
+    jvmTarget = "1.8"
+  }
+
+  project.kotlinCommonSettings(this)
+}