title: re-run with -feature for details, How to see scala feature warnings when building with gradle?
body: <p>The gradle scala plugin adds the <code>compileScala</code> task to the project. But sometimes the scala compiler might report something like the following:</p>
  
  <pre><code>$ 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
  </code></pre>
  
  <p>I tried to re-run with -feature but the gradle build complained as follows:</p>
  
  <pre><code>$ gradle compileScala -feature
  
  FAILURE: Build failed with an exception.
  
  * What went wrong:
  Problem configuring task :compileScala from command line.
  &gt; 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
  </code></pre>
  
  <p>gradle help --task :compileScala did not provide any useful information.</p>
  
  <p>The question is, when using gradle to compile scala code, how does one pass the -feature option to the scala compiler to see the feature warnings?</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Just in case this is useful:</p>
  
  <pre><code>$ 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
  </code></pre>