don't create dependencies if both root and end are not connected to any task

This happens when none of the actual jobs described in the DAX file
consumes and produces any file. In that case, root has no successor
and a dependency to end is created but end has no predecessor and a
dependency from root is created ... that already exists.

diff --git a/src/simdag/sd_daxloader.cpp b/src/simdag/sd_daxloader.cpp
index 4a83abd..543cb63 100644 (file)
--- a/src/simdag/sd_daxloader.cpp
+++ b/src/simdag/sd_daxloader.cpp
@@ -237,12 +237,14 @@ xbt_dynar_t SD_daxload(const char *filename)
       /* If some tasks do not take files as input, connect them to the root
        * if they don't produce files, connect them to the end node.
        */
-      if ((file != root_task) && file->inputs->empty())
-        SD_task_dependency_add(nullptr, nullptr, root_task, file);
-      if ((file != end_task) && file->outputs->empty())
-        SD_task_dependency_add(nullptr, nullptr, file, end_task);
+      if ((file != root_task) && (file != end_task)) {
+        if (file->inputs->empty())
+          SD_task_dependency_add(nullptr, nullptr, root_task, file);
+        if (file->outputs->empty())
+          SD_task_dependency_add(nullptr, nullptr, file, end_task);
+      }
     } else {
-       THROW_IMPOSSIBLE;
+      THROW_IMPOSSIBLE;
     }
   }