re-run with -feature for details, How to see scala feature warnings when building with gradle?

Question

The gradle scala plugin adds the `compileScala` task to the project. But sometimes the scala compiler might report something like the following: ``` $ gradle compileScala :compileJava UP-TO-DATE :compileScala [ant:scalac] warning: there were 3 feature warning(s); re-run with -feature for details [ant:scalac] one warning found BUILD SUCCESSFUL Total time: 21.796 secs ``` I tried to re-run with -feature but the gradle build complained as follows: ``` $ gradle compileScala -feature FAILURE: Build failed with an exception. * What went wrong: Problem configuring task :compileScala from command line. > Unknown command-line option '-f'. * Try: Run gradle help --task :compileScala to get task usage details. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED Total time: 4.792 secs ``` gradle help --task :compileScala did not provide any useful information. The question is, when using gradle to compile scala code, how does…

Accepted Answer

Checking `ScalaCompile` in the Gradle Build Language Reference leads to:

```
compileScala { // or: tasks.withType(ScalaCompile)
    scalaCompileOptions.additionalParameters = ["-feature"]
}
```

By the way, `scalaCompileOptions.useAnt = false` will switch from the Ant compiler to the incremental Zinc compiler, which is also used by sbt.

re-run with -feature for details, How to see scala feature warnings when building with gradle?

Solution

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