src/Pure/Tools/build.scala

             List("ML_Heap.save_child " +
               ML_Syntax.print_string_bytes(File.platform_path(store.output_heap(session_name))))
           }
           else Nil
 
-        if (options.bool("pide_session")) {
+        if (options.bool("pide_session") || true /* FIXME test */) {
           val resources = new Resources(sessions_structure, deps(parent))
           val session =
             new Session(options, resources) {
               override val xml_cache: XML.Cache = store.xml_cache
               override val xz_cache: XZ.Cache = store.xz_cache