From e6297959d909906ec4beef16be6b23cd7d71c7b0 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Thu, 21 Feb 2013 17:42:06 +0000
Subject: [PATCH] Version the navache filename.

Be friendly to people switching between 2.10 and dev (2.11), don't force a rebuild each time.
---
 src/Navaids/NavDataCache.cxx | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Navaids/NavDataCache.cxx b/src/Navaids/NavDataCache.cxx
index 1f1dc251a..0f1137c31 100644
--- a/src/Navaids/NavDataCache.cxx
+++ b/src/Navaids/NavDataCache.cxx
@@ -1089,7 +1089,16 @@ NavDataCache::NavDataCache()
 {
   const int MAX_TRIES = 3;
   SGPath homePath(globals->get_fg_home());
-  homePath.append("navdata.cache");
+  
+  std::ostringstream os;
+  string_list versionParts = simgear::strutils::split(VERSION, ".");
+  if (versionParts.size() < 2) {
+    os << "navdata.cache";
+  } else {
+    os << "navdata_" << versionParts[0] << "_" << versionParts[1] << ".cache";
+  }
+    
+  homePath.append(os.str());
   
   for (int t=0; t < MAX_TRIES; ++t) {
     try {
-- 
2.39.5