Disable doc jars only for Dotty

Author: anatoliykmetyuk

build.sc

@@ -75,12 +75,14 @@ object sourcecode extends Module {
       val crossScalaVersion = JvmSourcecodeModule.this.crossScalaVersion
     }
 
-    override def docJar = T {
-      val outDir = T.ctx().dest
-      val javadocDir = outDir / 'javadoc
-      os.makeDir.all(javadocDir)
-      mill.api.Result.Success(mill.modules.Jvm.createJar(Agg(javadocDir))(outDir))
-    }
+    override def docJar =
+      if (crossScalaVersion.startsWith("2")) super.docJar
+      else T {
+        val outDir = T.ctx().dest
+        val javadocDir = outDir / 'javadoc
+        os.makeDir.all(javadocDir)
+        mill.api.Result.Success(mill.modules.Jvm.createJar(Agg(javadocDir))(outDir))
+      }
   }
 
   object js extends Cross[JsSourcecodeModule](