As I see in current (3.0.3) and upcoming (4.0.0 M2) versions of scala-ide plugin for eclipse there is no "Xmax-classfile-name" option in Preferences > Scala > Compilier. In that case I think this option should go to scala.compiler.additionalParams in org.scala-ide.sdt.core.prefs file not as separate option as it is now. I test that when it is as separate option scala-ide ignores it. It works when it is added to scala.compiler.additionalParams.
I think the change should be done in com.typesafe.sbteclipse.core.EclipseSDTConfig.scala: remove line "TakesArg("Xmax-classfile-name"),"
As I see in current (3.0.3) and upcoming (4.0.0 M2) versions of scala-ide plugin for eclipse there is no "Xmax-classfile-name" option in Preferences > Scala > Compilier. In that case I think this option should go to scala.compiler.additionalParams in org.scala-ide.sdt.core.prefs file not as separate option as it is now. I test that when it is as separate option scala-ide ignores it. It works when it is added to scala.compiler.additionalParams.
I think the change should be done in com.typesafe.sbteclipse.core.EclipseSDTConfig.scala: remove line "TakesArg("Xmax-classfile-name"),"