2 files changed, 32 insertions, 0 deletions
diff --git a/src/partest/scala/tools/partest/nest/PathSettings.scala b/src/partest/scala/tools/partest/nest/PathSettings.scala
index 7c005b4f61..b1f868c9d2 100644
--- a/src/partest/scala/tools/partest/nest/PathSettings.scala
+++ b/src/partest/scala/tools/partest/nest/PathSettings.scala
@@ -8,6 +8,7 @@ package nest
 import scala.tools.nsc.Properties.{ setProp, propOrEmpty, propOrNone, propOrElse }
 import scala.tools.nsc.util.ClassPath
 import scala.tools.nsc.io
+import scala.util.Properties.{ envOrElse, envOrNone, javaHome, jdkHome }
 import io.{ Path, File, Directory }
 
 object PathSettings {
@@ -74,6 +75,35 @@ object PathSettings {
 
   lazy val diffUtils: File =
     findJar(buildPackLibDir.files, "diffutils") getOrElse sys.error(s"No diffutils.jar found in '$buildPackLibDir'.")
+
+  /** The platform-specific support jar.
+   *  Usually this is tools.jar in the jdk/lib directory of the platform distribution.
+   *  The file location is determined by probing the lib directory under JDK_HOME or JAVA_HOME,
+   *  if one of those environment variables is set, then the lib directory under java.home,
+   *  and finally the lib directory under the parent of java.home. Or, as a last resort,
+   *  search deeply under those locations (except for the parent of java.home, on the notion
+   *  that if this is not a canonical installation, then that search would have litte
+   *  chance of succeeding).
+   */
+  lazy val platformTools: Option[File] = {
+    val jarName = "tools.jar"
+    def jarPath(path: Path) = (path / "lib" / jarName).toFile
+    def jarAt(path: Path) = {
+      val f = jarPath(path)
+      if (f.isFile) Some(f) else None
+    }
+    val jdkDir = {
+      val d = Directory(jdkHome)
+      if (d.isDirectory) Some(d) else None
+    }
+    def deeply(dir: Directory) = dir.deepFiles find (_.name == jarName)
+
+    val home    = envOrNone("JDK_HOME") orElse envOrNone("JAVA_HOME") map (p => Path(p))
+    val install = Some(Path(javaHome))
+
+    (home flatMap jarAt) orElse (install flatMap jarAt) orElse (install map (_.parent) flatMap jarAt) orElse
+      (jdkDir flatMap deeply)
+  }
 }
 
 class PathSettings() {
diff --git a/src/partest/scala/tools/partest/nest/RunnerManager.scala b/src/partest/scala/tools/partest/nest/RunnerManager.scala
index 1c689714c7..fa2b5ea74b 100644
--- a/src/partest/scala/tools/partest/nest/RunnerManager.scala
+++ b/src/partest/scala/tools/partest/nest/RunnerManager.scala
@@ -74,8 +74,10 @@ object Output {
 
 class RunnerManager(kind: String, val fileManager: FileManager, params: TestRunParams) {
   import fileManager._
+
   fileManager.CLASSPATH += File.pathSeparator + PathSettings.scalaCheck
   fileManager.CLASSPATH += File.pathSeparator + PathSettings.diffUtils // needed to put diffutils on test/partest's classpath
+  PathSettings.platformTools foreach (fileManager.CLASSPATH += File.pathSeparator + _)
 
   def runTest(testFile: File): TestState = {
     val runner = new Runner(testFile, fileManager) {