kapt: Warn on using android-apt with kapt

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/AnnotationProcessingManager.kt

@@ -42,6 +42,8 @@ public class AnnotationProcessingManager(
         val JAVA_FQNAME_PATTERN = "^([\\p{L}_$][\\p{L}\\p{N}_$]*\\.)*[\\p{L}_$][\\p{L}\\p{N}_$]*$".toRegex()
         val WRAPPERS_DIRECTORY = "wrappers"
         val GEN_ANNOTATION = "__gen/annotation"
+
+        private val ANDROID_APT_PLUGIN_ID = "com.neenbedankt.android-apt"
     }
 
     fun getAnnotationFile(): File {
@@ -52,6 +54,10 @@ public class AnnotationProcessingManager(
     fun setupKapt() {
         if (aptFiles.isEmpty()) return
 
+        if (project.getPlugins().findPlugin("com.neenbedankt.android-apt") != null) {
+            project.getLogger().warn("Please do not use `$ANDROID_APT_PLUGIN_ID` with kapt.")
+        }
+
         generateJavaHackFile(aptWorkingDir, javaTask)
 
         val annotationProcessorFqNames = lookupAnnotationProcessors(aptFiles)