From 0a6fe33bc34781dafe69702b81a03efcb2941747 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Fri, 10 Apr 2020 10:40:24 +0100
Subject: [PATCH] Add support for compatible-fg-version in -set.xml

This is to evaluate if this is a good idea, not sure if we actually
want to commit to this approach yet.
---
 src/Main/fg_init.cxx | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index efa39e94b..90f860a3c 100644
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -389,7 +389,27 @@ private:
       } else {
           SG_LOG(SG_AIRCRAFT, SG_DEV_ALERT, "Aircraft does not specify a minimum FG version: please add one at /sim/minimum-fg-version");
       }
-
+      
+      auto compatNodes = globals->get_props()->getNode("/sim")->getChildren("compatible-fg-version");
+      if (!compatNodes.empty()) {
+          bool showCompatWarning = true;
+          
+          // if we have at least one compatibility node, then it needs to match
+          for (const auto& cn : compatNodes) {
+              const auto v = cn->getStringValue();
+              if (simgear::strutils::compareVersionToWildcard(FLIGHTGEAR_VERSION, v)) {
+                  showCompatWarning = false;
+                  break;
+              }
+          }
+          
+          if (showCompatWarning) {
+              flightgear::modalMessageBox("Aircraft not compatible with this version",
+              "The selected aircraft has not been checked for compatability with this version of FlightGear (" FLIGHTGEAR_VERSION  "). "
+                                          "Some aircraft features might not work, or might be displayed incorrectly.");
+          }
+      }
+      
       return true;
   }