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Posted to dev@kafka.apache.org by "David Arthur (Jira)" <ji...@apache.org> on 2020/03/05 16:36:00 UTC

[jira] [Created] (KAFKA-9665) Scala compile not producing unused warnings

David Arthur created KAFKA-9665:
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             Summary: Scala compile not producing unused warnings
                 Key: KAFKA-9665
                 URL: https://issues.apache.org/jira/browse/KAFKA-9665
             Project: Kafka
          Issue Type: Bug
          Components: build
            Reporter: David Arthur
            Assignee: David Arthur


While reviewing KAFKA-9661, I wondered about the compiler giving us a warning for unused locals. I ran the build locally and didn't see any warnings. Turns out Scala 2.12 doesn't support the compiler flag {{-Xlint:unused}}. Since we build with 2.12 by default, we can easily miss these warnings. 

We should instead use {{-Ywarn-unused:locals}} which works for scalac 2.12 and 2.13.



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