Added debug flag ignoreCycles for #4543.

- Added debug flag ignoreCycles to ignore the error regarding cyclically
  dependent constants or parameters.

Author: perost

Compiler/FrontEnd/InstUtil.mo

@@ -1989,17 +1989,17 @@ protected function checkCyclicalComponents
   input FCore.Graph inEnv;
   type Element = tuple<SCode.Element, DAE.Mod>;
 algorithm
-  _ := matchcontinue(inCycles, inEnv)
+  _ := matchcontinue inCycles
     local
       list<list<Element>> cycles;
       list<list<String>> names;
       list<String> cycles_strs;
       String cycles_str, scope_str;
       list<tuple<Element, list<Element>>> graph;
 
-    case ({}, _) then ();
+    case {} then ();
 
-    case (_, _)
+    case _
       equation
         graph = Graph.filterGraph(inCycles, isElementParamOrConst);
         {} = Graph.findCycles(graph, isElementEqual);
@@ -2015,8 +2015,12 @@ algorithm
         cycles_str = "{" + cycles_str + "}";
         scope_str = FGraph.printGraphPathStr(inEnv);
         Error.addMessage(Error.CIRCULAR_COMPONENTS, {scope_str, cycles_str});
+
+        if not Flags.isSet(Flags.IGNORE_CYCLES) then
+          fail();
+        end if;
       then
-        fail();
+        ();
   end matchcontinue;
 end checkCyclicalComponents;
 

Compiler/Util/Error.mo

@@ -467,7 +467,7 @@ public constant Message METARECORD_CONTAINS_METARECORD_MEMBER = MESSAGE(168, TRA
 public constant Message INVALID_EXTERNAL_OBJECT = MESSAGE(169, TRANSLATION(), ERROR(),
   Util.gettext("Invalid external object %s, %s."));
 public constant Message CIRCULAR_COMPONENTS = MESSAGE(170, TRANSLATION(), ERROR(),
-  Util.gettext("Cyclically dependent constants or parameters found in scope %s: %s."));
+  Util.gettext("Cyclically dependent constants or parameters found in scope %s: %s (ignore with -d=ignoreCycles)."));
 public constant Message FAILURE_TO_DEDUCE_DIMS_FROM_MOD = MESSAGE(171, TRANSLATION(), WARNING(),
   Util.gettext("Failed to deduce dimensions of %s due to unknown dimensions of modifier %s."));
 public constant Message REPLACEABLE_BASE_CLASS = MESSAGE(172, TRANSLATION(), ERROR(),

Compiler/Util/Flags.mo

@@ -516,6 +516,8 @@ constant DebugFlag MERGE_ALGORITHM_SECTIONS = DEBUG_FLAG(170, "mergeAlgSections"
   Util.gettext("Disables coloring algorithm while sparsity detection."));
 constant DebugFlag WARN_NO_NOMINAL = DEBUG_FLAG(171, "warnNoNominal", false,
   Util.gettext("Prints the iteration variables in the initialization and simulation DAE, which do not have a nominal value."));
+constant DebugFlag IGNORE_CYCLES = DEBUG_FLAG(172, "ignoreCycles", false,
+  Util.gettext("Ignores cycles between constant/parameter components."));
 
 
 // This is a list of all debug flags, to keep track of which flags are used. A
@@ -694,7 +696,8 @@ constant list<DebugFlag> allDebugFlags = {
   NF_UNITCHECK,
   DISABLE_COLORING,
   MERGE_ALGORITHM_SECTIONS,
-  WARN_NO_NOMINAL
+  WARN_NO_NOMINAL,
+  IGNORE_CYCLES
 };
 
 public