ParallelTesting#compile: nicer way to pass output flags to javac

Author: smarter

compiler/test/dotty/tools/vulpix/ParallelTesting.scala

@@ -322,7 +322,8 @@ trait ParallelTesting extends RunnerOrchestration { self =>
 
     protected def compile(files0: Array[JFile], flags0: Array[String], suppressErrors: Boolean, targetDir: JFile): TestReporter = {
 
-      val flags = flags0 ++ Array("-d", targetDir.getAbsolutePath)
+      val outputFlags = Array("-d", targetDir.getAbsolutePath)
+      val flags = flags0 ++ outputFlags
 
       def flattenFiles(f: JFile): Array[JFile] =
         if (f.isDirectory) f.listFiles.flatMap(flattenFiles)
@@ -344,7 +345,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
           "javac",
           "-classpath",
           s".:${Jars.scalaLibraryFromRuntime}:${targetDir.getAbsolutePath}"
-        ) ++ flags.takeRight(2) ++ fs
+        ) ++ outputFlags ++ fs
 
         Runtime.getRuntime.exec(fullArgs).waitFor() == 0
       } else true