Reinstate the benchmarks project

build.sbt

@@ -145,6 +145,7 @@ lazy val zincRoot: Project = (project in file("."))
     compilerInterface.projectRefs ++
       compilerBridge.projectRefs ++
       zincApiInfo.projectRefs ++
+      zincBenchmarks.projectRefs ++
       zincClasspath.projectRefs ++
       zincClassfile.projectRefs ++
       zincCompileCore.projectRefs ++
@@ -349,21 +350,20 @@ lazy val zincCore = (projectMatrix in internalPath / "zinc-core")
   .jvmPlatform(scalaVersions = List(scala212, scala213))
   .configure(addBaseSettingsAndTestDeps, addSbtIO, addSbtUtilLogging, addSbtUtilRelation)
 
-// lazy val zincBenchmarks = (project in internalPath / "zinc-benchmarks")
-//   .dependsOn(compilerInterface % "compile->compile;compile->test")
-//   .dependsOn(compilerBridge212, zincCore, zincTesting % Test)
-//   .enablePlugins(JmhPlugin)
-//   .settings(
-//     noPublish,
-//     name := "Benchmarks of Zinc and the compiler bridge",
-//     libraryDependencies ++= Seq(
-//       "org.eclipse.jgit" % "org.eclipse.jgit" % "5.4.2.201908231537-r",
-//       "net.openhft" % "affinity" % "3.1.11"
-//     ),
-//     scalaVersion := scala212,
-//     crossScalaVersions := Seq(scala212),
-//     javaOptions in Test ++= List("-Xmx600M", "-Xms600M"),
-//   )
+ lazy val zincBenchmarks = (projectMatrix in internalPath / "zinc-benchmarks")
+   .dependsOn(compilerInterface % "compile->compile;compile->test")
+   .dependsOn(compilerBridge, zincCore, zincTesting % "compile->test")
+   .enablePlugins(JmhPlugin)
+   .settings(
+     noPublish,
+     name := "Benchmarks of Zinc and the compiler bridge",
+     libraryDependencies ++= Seq(
+       "org.eclipse.jgit" % "org.eclipse.jgit" % "5.4.2.201908231537-r",
+       "net.openhft" % "affinity" % "3.1.11"
+     ),
+     javaOptions in Test ++= List("-Xmx600M", "-Xms600M"),
+   )
+   .jvmPlatform(scalaVersions = List(scala212, scala213))
 
 // sbt-side interface to compiler.  Calls compiler-side interface reflectively
 lazy val zincCompileCore = (projectMatrix in internalPath / "zinc-compile-core")
@@ -706,10 +706,7 @@ tearDownBenchmarkResources in ThisBuild := { IO.delete(dir) }
 
 addCommandAlias(
   "runBenchmarks",
-  s""";zincBenchmarks/run $dirPath
-     |;zincBenchmarks/jmh:run -p _tempDir=$dirPath -prof gc
-     |;tearDownBenchmarkResources
-   """.stripMargin
+  s""";zincBenchmarksJVM2_12/run $dirPath;zincBenchmarksJVM2_12/jmh:run -p _tempDir=$dirPath -prof gc;tearDownBenchmarkResources""".stripMargin
 )
 
 lazy val otherRootSettings = Seq(

internal/zinc-benchmarks/src/main/scala/xsbt/ZincBenchmark.scala

@@ -134,7 +134,7 @@ private[xsbt] object ZincBenchmark {
       compilationInfo: CompilationInfo
   ): ZincCompiler = {
     object output extends SingleOutput {
-      def getOutputDirectory: File = outputDir
+      def getOutputDirectory = outputDir.toPath
       override def toString = s"SingleOutput($getOutputDirectory)"
     }
     val args = compilationInfo.scalacOptions