Re-run with -feature for more information. How to see scala warnings when creating 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 restarting with -feature, but the gradle construct 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.

Question: when using gradle to compile scala code, how do I pass the -feature parameter to the scala compiler to view function warnings?

EDIT

Just in case, this is useful:

 $ gradle --version ------------------------------------------------------------ Gradle 1.12 ------------------------------------------------------------ Build time: 2014-04-29 09:24:31 UTC Build number: none Revision: a831fa866d46cbee94e61a09af15f9dd95987421 Groovy: 1.8.6 Ant: Apache Ant(TM) version 1.9.3 compiled on December 23 2013 Ivy: 2.2.0 JVM: 1.7.0_55 (Oracle Corporation 24.55-b03) OS: Linux 3.13.0-27-generic amd64 $ scala -version Scala code runner version 2.10.3 -- Copyright 2002-2013, LAMP/EPFL 

Answer 1

Checking ScalaCompile in Gradle The assembly language reference results in:

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

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