title: Checking if kapt uses incremental annotation processing
body: <p>In Kotlin 1.3.30 support for incremental annotation processing was added: <a href="https://blog.jetbrains.com/kotlin/2019/04/kotlin-1-3-30-released/" rel="nofollow noreferrer">https://blog.jetbrains.com/kotlin/2019/04/kotlin-1-3-30-released/</a>
  According to the doc:</p>
  
  <blockquote>
    <p>Note that in the current implementation, using any non-incremental
    annotation processor or a change in dependency’s ABI (so far,
    including modifying internal declarations) will lead to
    non-incremental annotation processing for a given module.</p>
  </blockquote>
  
  <p>I have a multi-module project with multiple annotation processors. Only some of them are incremental. There are modules which use only incremental annotation processors to the best of my knowledge at least.</p>
  
  <p>My question is:
  Is there a way to check if incremental annotation processing happened? E.g. are there any specific console logs in Gradle which indicate that? I would like to confirm that incremental annotation processing was in fact used.</p>