Root project shouldn't compile any sources.

Let's override `sources` task to return empty collections of sources to
compile. Otherwise, sbt by default would pick up sources in the root
directory which is not what we want.

1 files changed, 2 insertions, 1 deletions

diff --git a/build.sbt b/build.sbt
index d86e4ad779..d4cad4d973 100644
--- a/build.sbt
+++ b/build.sbt
@@ -184,7 +184,8 @@ lazy val root = (project in file(".")).
   aggregate(library, forkjoin, reflect, compiler, asm, interactive, repl,
     scaladoc, scalap, actors).settings(
     scalaVersion := bootstrapScalaVersion,
-    ivyScala := ivyScala.value map { _.copy(overrideScalaVersion = true) }
+    ivyScala := ivyScala.value map { _.copy(overrideScalaVersion = true) },
+    sources in Compile := Seq.empty
   )
 
 /**