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Fix incremental compilation under Java 8 #5061

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Aug 30, 2018
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10 changes: 10 additions & 0 deletions project/Build.scala
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@ import dotty.tools.sbtplugin.DottyIDEPlugin.autoImport._
import sbtbuildinfo.BuildInfoPlugin
import sbtbuildinfo.BuildInfoPlugin.autoImport._

import scala.util.Properties.isJavaAtLeast

/* In sbt 0.13 the Build trait would expose all vals to the shell, where you
* can use them in "set a := b" like expressions. This re-exposes them.
*/
Expand Down Expand Up @@ -225,6 +227,14 @@ object Build {
// non-bootstrapped dotty-library that will then take priority over
// the bootstrapped dotty-library on the classpath or sourcepath.
classpathOptions ~= (_.withAutoBoot(false)),
// ... but when running under Java 8, we still need a Scala bootclasspath that contains the JVM bootclasspath,
// otherwise sbt incremental compilation breaks.
scalacOptions ++= {
if (isJavaAtLeast("9"))
Seq()
else
Seq("-bootclasspath", sys.props("sun.boot.class.path"))
},

// Enforce that the only Scala 2 classfiles we unpickle come from scala-library
/*
Expand Down