From 3d9d44cf73c751854322982294183d88ad8b8aca Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Tue, 5 Jan 2016 23:18:41 -0600
Subject: [PATCH] Fix negative loop counts when dt is small.

---
 simgear/structure/subsystem_mgr.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/simgear/structure/subsystem_mgr.cxx b/simgear/structure/subsystem_mgr.cxx
index 5e26a432..b01a0ffe 100644
--- a/simgear/structure/subsystem_mgr.cxx
+++ b/simgear/structure/subsystem_mgr.cxx
@@ -234,6 +234,7 @@ SGSubsystemGroup::update (double delta_time_sec)
     if ((delta_time_sec > 0.0) && (_fixedUpdateTime > 0.0)) {
       double localDelta = delta_time_sec + _updateTimeRemainder;
       loopCount = SGMiscd::roundToInt(localDelta / _fixedUpdateTime);
+      loopCount = std::max(0, loopCount);
       _updateTimeRemainder = delta_time_sec - (loopCount * _fixedUpdateTime);
       delta_time_sec = _fixedUpdateTime;
     }
-- 
2.39.5