From dd197765c8349c5ba6cfafd24cc0196473bc5ab1 Mon Sep 17 00:00:00 2001
From: psi29a <psi29a@gmail.com>
Date: Wed, 16 Jun 2021 08:28:48 +0000
Subject: [PATCH] cmake check to enforce that if someone uses OSG 3.6, that it
 is at least 3.6.5

---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e1f0a01ca..ee7e29bd7a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -355,7 +355,11 @@ if(NOT HAVE_STDINT_H)
 endif()
 
 if(OPENMW_USE_SYSTEM_OSG)
-    find_package(OpenSceneGraph 3.3.4 REQUIRED ${USED_OSG_COMPONENTS})
+    find_package(OpenSceneGraph 3.4.0 REQUIRED ${USED_OSG_COMPONENTS})
+    if (${OPENSCENEGRAPH_VERSION} VERSION_GREATER 3.6.2 AND ${OPENSCENEGRAPH_VERSION} VERSION_LESS 3.6.5)
+        message(FATAL_ERROR "OpenSceneGraph version ${OPENSCENEGRAPH_VERSION} has critical regressions which cause crashes. Please upgrade to 3.6.5 or later. We strongly recommend using the tip of the official 'OpenSceneGraph-3.6' branch or the tip of '3.6' OpenMW/osg (OSGoS).")
+    endif()
+
     if(OSG_STATIC)
         find_package(OSGPlugins REQUIRED COMPONENTS ${USED_OSG_PLUGINS})
     endif()