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src/Pure/Tools/build.scala
changeset 66972 f65fc869e835
parent 66968 9991671c98aa
child 67011 bab3208d8d37 
--- a/src/Pure/Tools/build.scala	Wed Nov 01 12:31:53 2017 +0100
+++ b/src/Pure/Tools/build.scala	Wed Nov 01 13:06:01 2017 +0100
@@ -227,8 +227,8 @@
             ("ISABELLE_ML_DEBUGGER" -> options.bool("ML_debugger").toString)
 
         def save_heap: String =
-          "ML_Heap.share_common_data (); ML_Heap.save_child " +
-            ML_Syntax.print_string_bytes(File.platform_path(output))
+          (if (info.theories.isEmpty) "" else "ML_Heap.share_common_data (); ") +
+            "ML_Heap.save_child " + ML_Syntax.print_string_bytes(File.platform_path(output))
 
         if (pide && !Sessions.is_pure(name)) {
           val resources = new Resources(deps(parent))
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