Automatically work around compiler bug for empty sourceSet

Author: wkornewald

build-logic/build-logic-base/src/main/kotlin/com/ensody/buildlogic/AndroidExt.kt

@@ -13,7 +13,7 @@ fun Project.setupAndroid(
     javaVersion: JavaVersion = JavaVersion.VERSION_17,
 ) {
     configure<BaseExtension> {
-        namespace = "$group.${name.replace('-', '.')}"
+        namespace = getDefaultPackageName()
         val sdk = 35
         compileSdkVersion(sdk)
         defaultConfig {

build-logic/build-logic-base/src/main/kotlin/com/ensody/buildlogic/KotlinMultiplatformExt.kt

@@ -19,6 +19,21 @@ fun Project.setupKmp(
     javaVersion: JavaVersion = JavaVersion.VERSION_17,
     block: KotlinMultiplatformExtension.() -> Unit,
 ) {
+    val commonMainDir = file("src/commonMain")
+    if (!commonMainDir.exists() || commonMainDir.walkBottomUp().none { it.extension == "kt" }) {
+        val packageName = getDefaultPackageName()
+        withGeneratedBuildFile("empty", "${packageName.replace(".", "/")}/empty.kt", "commonMain") {
+            """
+            package $packageName
+
+            // The Kotlin compiler doesn't like empty binaries
+            // Workaround for https://youtrack.jetbrains.com/issue/KT-42702
+            // and https://youtrack.jetbrains.com/issue/KT-47345
+            internal val empty: Boolean = false
+            """
+        }
+    }
+
     tasks.withType<Test> {
         testLogging {
             exceptionFormat = TestExceptionFormat.FULL

build-logic/build-logic-base/src/main/kotlin/com/ensody/buildlogic/Utils.kt

@@ -42,6 +42,11 @@ fun Project.withGeneratedBuildFile(category: String, path: String, sourceSet: St
     generatedFiles.getOrPut(this.path) { mutableSetOf() }.add(outputPath.normalize().absoluteFile)
 }
 
+fun Project.getDefaultPackageName(): String =
+    group.toString().split(".").let { prefix ->
+        prefix + name.split("-").dropWhile { it == prefix.last() }
+    }.joinToString(".")
+
 internal val generatedFiles = mutableMapOf<String, MutableSet<File>>()
 
 internal fun File.withParents(): List<File> =