Imported From: https://issues.scala-lang.org/browse/SI-8410?orig=1
Reporter: @puffnfresh
Affected Versions: 2.11.0-RC1

@retronym said:
We're working on a configurable warning escalation / demotion facility but it won't be here until 2.11.1.

For now, I'd suggest to run without fatal warnings and post-process the compiler output in a build tool.

@puffnfresh said:
@retronym as you know, I'm really interested in configurable warnings. Is there anything available to see what the plan is?

@retronym said:
Adriaan is prototyping something here: https://github.com/adriaanm/scala/tree/report-filter

Another (SBT specific) angle would be to add a hook into:

https://github.com/sbt/sbt/blob/0.13/compile/interface/src/main/scala/xsbt/DelegatingReporter.scala

to filter to your hearts content.

@puffnfresh said:
I've added this extremely awful task to SBT:

def fatalWarningsTask = TaskKey[Unit]("fatalWarnings") <<= Def.task {
  fatalWarningsTaskImpl(streams.value, (compile in Compile).value)
}

def fatalWarningsTaskImpl(s: TaskStreams, a: sbt.inc.Analysis) {
  def logProblem(l: (=> String) => Unit, f: File, p: xsbti.Problem) = {
    l(f.toString + ":" + p.position.line.fold("")(_ + ":") + " " + p.message)
    l(p.position.lineContent)
    l("")
  }

  var failed = 0
  a.infos.allInfos.foreach { case (k, i) =>
    i.reportedProblems foreach { p =>
      val deprecation = p.message.contains("is deprecated")

      if(!deprecation)
        failed = failed + 1

      logProblem(if(deprecation) s.log.warn else s.log.error, k, p)
    }
  }

  if(failed > 0)
    error("Fatal warnings")
}

A total mess.

@som-snytt said (edited on Sep 1, 2014 12:12:14 PM UTC):
The traditional advice on deprecation warnings is to pipe it through a deprecated something that doesn't warn.

Retronym has suggested deprecating a trait, implemented by its companion, and use the module method.

I have suggested deprecating a local function that forwards the call, to the same effect.

Edit: deprecated locals loophole was closed in 2.11.0-M8.

@SethTisue said:
#7529 is very similar, just replacing -deprecation with -Yinline-warnings.

@som-snytt said (edited on Mar 4, 2017 1:19:32 AM UTC):
This PR respects explicit settings (which were new this year):

-deprecation:false -Yinline-warnings:false

scala/scala#3955

@adriaanm said:
With scala/scala#4544, a cleaner solution is within reach, btw.

https://github.com/ghik/silencer is useful here