Build with revised SGPropertyNode alias() API

src/AIModel/AIBase.cxx

@@ -805,7 +805,7 @@ void FGAIBase::bind() {
     // The property above was incorrectly labelled 'longitude-mode' up until
     // FG 2018.4, so create an alias in case anyone is relying on the old name
     auto node = props->getNode("controls/flight/longitude-mode", true);
-    node->alias(props->getNode("controls/flight/vertical-mode"));
+    node->alias(props->getNode("controls/flight/vertical-mode"), false);
 
     props->setDoubleValue("controls/flight/target-alt", altitude_ft);
     props->setDoubleValue("controls/flight/target-pitch", pitch);

src/Aircraft/replay-internal.cxx

@@ -248,7 +248,7 @@ void FGReplayInternal::init()
     m_log_frame_times = fgGetNode("/sim/replay/log-frame-times", true);
 
     // alias to keep backward compatibility
-    fgGetNode("/sim/freeze/replay-state", true)->alias(m_replay_master);
+    fgGetNode("/sim/freeze/replay-state", true)->alias(m_replay_master, false);
 
     reinit();
 }

src/FDM/JSBSim/JSBSim.cxx

@@ -198,8 +198,8 @@ FGJSBsim::FGJSBsim( double dt )
 // deprecate sim-time-sec for simulation/sim-time-sec
 // remove alias with increased configuration file version number (2.1 or later)
     SGPropertyNode * node = fgGetNode("/fdm/jsbsim/simulation/sim-time-sec");
-    fgGetNode("/fdm/jsbsim/sim-time-sec", true)->alias( node );
-// end of sim-time-sec deprecation patch
+    fgGetNode("/fdm/jsbsim/sim-time-sec", true)->alias(node, false);
+    // end of sim-time-sec deprecation patch
 
     _ai_wake_enabled = fgGetNode("fdm/ai-wake/enabled", true);
 

src/FDM/YASim/FGFDM.cpp

@@ -115,7 +115,7 @@ void FGFDM::init()
     _gross_weight_lbs = _yasimN->getNode("gross-weight-lbs", true);
 
     // alias to older name
-    fgGetNode("/yasim/gross-weight-lbs", true)->alias(_gross_weight_lbs);
+    fgGetNode("/yasim/gross-weight-lbs", true)->alias(_gross_weight_lbs, false);
 
     // write some compile time information to property tree
     _yasimN->getNode("config-version",true)->setIntValue(_airplane.getVersion());

src/Instrumentation/gps.cxx

@@ -155,7 +155,7 @@ GPS::init ()
 // waypoints
   // for compatibility, alias selected course down to wp/wp[1]/desired-course-deg
   SGPropertyNode* wp1Crs = _currentWayptNode->getChild("desired-course-deg", 0, true);
-  wp1Crs->alias(_gpsNode->getChild("desired-course-deg", 0, true));
+  wp1Crs->alias(_gpsNode->getChild("desired-course-deg", 0, true), true);
 
   _tracking_bug_node = _gpsNode->getChild("tracking-bug", 0, true);
     
@@ -167,12 +167,12 @@ GPS::init ()
     
 // navradio slaving properties
   SGPropertyNode* toFlag = _gpsNode->getChild("to-flag", 0, true);
-  toFlag->alias(_currentWayptNode->getChild("to-flag"));
-  
+  toFlag->alias(_currentWayptNode->getChild("to-flag"), true);
+
   SGPropertyNode* fromFlag = _gpsNode->getChild("from-flag", 0, true);
-  fromFlag->alias(_currentWayptNode->getChild("from-flag"));
-    
-// autopilot drive properties
+  fromFlag->alias(_currentWayptNode->getChild("from-flag"), true);
+
+  // autopilot drive properties
   _apDrivingFlag = fgGetNode("/autopilot/settings/gps-driving-true-heading", true);
   _apTrueHeading = fgGetNode("/autopilot/settings/true-heading-deg",true);
 

src/Instrumentation/navradio.cxx

@@ -266,7 +266,7 @@ FGNavRadio::init ()
     // dme-in-range is deprecated,
     // temporarily create dme-in-range alias for instrumentation/dme[0]/in-range
     // remove after flightgear 2.6.0
-    node->getNode( "dme-in-range", true )->alias( fgGetNode("/instrumentation/dme[0]/in-range", true ) );
+    node->getNode("dme-in-range", true)->alias(fgGetNode("/instrumentation/dme[0]/in-range", true), false);
 }
 
 void

src/Instrumentation/transponder.cxx

@@ -147,9 +147,9 @@ void Transponder::init()
     if (_kt70Compat) {
         // alias the properties through
         SGPropertyNode_ptr output = node->getChild("outputs", 0, true);
-        output->getChild("flight-level", 0, true)->alias(_altitude_node);
-        output->getChild("id-code", 0, true)->alias(_idCode_node);
-        in_node->getChild("func-knob", 0, true)->alias(_knob_node);
+        output->getChild("flight-level", 0, true)->alias(_altitude_node, true);
+        output->getChild("id-code", 0, true)->alias(_idCode_node, true);
+        in_node->getChild("func-knob", 0, true)->alias(_knob_node, true);
     }
 }
 

src/Scripting/NasalSys.cxx

@@ -1864,7 +1864,7 @@ naRef FGNasalSys::setListener(naContext c, int argc, naRef* args)
         return naNil();
     }
 
-    if (node->isTied()) {
+    if (node->isTied() || node->isAlias()) {
         const auto isSafe = node->getAttribute(SGPropertyNode::LISTENER_SAFE);
         if (!isSafe) {
             SG_LOG(SG_NASAL, SG_DEV_ALERT, "ERROR: Cannot add listener to tied property " <<

src/Scripting/nasal-props.cxx

@@ -801,12 +801,18 @@ static naRef f_alias(naContext c, naRef me, int argc, naRef* args)
     try {
         if(naIsString(prop)) al = globals->get_props()->getNode(naStr_data(prop), true);
         else if(naIsGhost(prop)) al = static_cast<SGPropertyNode*>(naGhost_ptr(prop));
-        else throw string("props.alias() with bad argument");
-    } catch (const string& err) {
-        naRuntimeError(c, (char *)err.c_str());
+        else
+            throw sg_exception("props.alias() with bad argument");
+    } catch (sg_exception& err) {
+        naRuntimeError(c, err.what());
         return naNil();
     }
-    return naNum(node->alias(al));
+
+    bool withListeners = false;
+    if (naVec_size(argv) > 1) {
+        withListeners = static_cast<int>(naVec_get(argv, 1).num) != 0;
+    }
+    return naNum(node->alias(al, withListeners));
 }