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OverrideScalaMediator: fix bootstrapping a Scala compiler 

Fixes #2867, #2896
This commit is contained in:
Guillaume Martres 2017-01-08 21:59:19 +01:00 committed by Eugene Yokota
parent 9b0818f49a
commit 9375c88a8b
1 changed files with 10 additions and 1 deletions
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11
librarymanagement/src/main/scala/sbt/librarymanagement/IvyScalaExtra.scala
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@ -62,13 +62,22 @@ private[sbt] abstract class IvyScalaFunctions {
// Mediate only for the dependencies in scalaVersion configurations. https://github.com/sbt/sbt/issues/2786
def configQualifies: Boolean =
(dd.getModuleConfigurations exists { scalaVersionConfigs })
// Do not rewrite the dependencies of Scala dependencies themselves, this prevents bootstrapping
// a Scala compiler using another Scala compiler.
def dependeeQualifies: Boolean =
dd.getParentRevisionId.getName match {
case name @ (CompilerID | LibraryID | ReflectID | ActorsID | ScalapID) =>
false
case _ =>
true
}
val transformer =
new NamespaceTransformer {
def transform(mrid: ModuleRevisionId): ModuleRevisionId = {
if (mrid == null) mrid
else
mrid.getName match {
case name @ (CompilerID | LibraryID | ReflectID | ActorsID | ScalapID) if configQualifies =>
case name @ (CompilerID | LibraryID | ReflectID | ActorsID | ScalapID) if configQualifies && dependeeQualifies =>
ModuleRevisionId.newInstance(scalaOrganization, name, mrid.getBranch, scalaVersion, mrid.getQualifiedExtraAttributes)
case _ => mrid
}