fix ticket:3960

OpenModelica · Jun 14, 2016 · d59e2f8 · d59e2f8
1 parent 447096d
commit d59e2f8
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Compiler/Template/CodegenFMUCommon.tpl b/Compiler/Template/CodegenFMUCommon.tpl
@@ -377,11 +377,15 @@ template ModelStructureDerivatives(FmiDerivatives fmiDerivatives)
 ::=
 match fmiDerivatives
 case FMIDERIVATIVES(__) then
+  if intGt(listLength(fmiUnknownsList), 0) then
   <<
   <Derivatives>
     <%ModelStructureUnknowns(fmiUnknownsList)%>
   </Derivatives>
   >>
+  else
+  // don't generate the element if model has none
+  <<>>
 end ModelStructureDerivatives;
 
 template ModelStructureDiscreteStates(FmiDiscreteStates fmiDiscreteStates)