From 4ce6b07886450a1f75eecc02b62bc91970de61cf Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 18 Dec 2014 15:59:16 +0000
Subject: [PATCH] From Mattias Helsing, "CMake have release 3.0 and 3.1 and we
 have some bad checks for cmake major version when settings cmake policies in
 CMakeLists.txt. This fixes it"

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14620 16af8721-9629-0410-8352-f15c8da7e697
---
 CMakeLists.txt | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9d618eefa..0db1adb18 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,25 +22,30 @@ if(COMMAND cmake_policy)
 
     # tell CMake to prefer CMake's own CMake modules when available
     # only available from cmake-2.8.4
-    if(${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 8 AND ${CMAKE_PATCH_VERSION} GREATER 3)
+    if(${CMAKE_MAJOR_VERSION} GREATER 2 OR
+        (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} GREATER 8) OR
+        (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 8 AND ${CMAKE_PATCH_VERSION} GREATER 3))
         cmake_policy(SET CMP0017 NEW)
     endif()
 
     # cmake-2.6.1 introduces policy cmp0008 decide how to treat full path libraries that do not appear to be valid library file names
     # quote from cvslog "Such libraries worked by accident in the VS IDE and Xcode generators in CMake 2.4 and below."
-    if(${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} GREATER 4 AND ${CMAKE_PATCH_VERSION} GREATER 0)
+    if(${CMAKE_MAJOR_VERSION} GREATER 2 OR
+        (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} GREATER 6) OR
+        (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 6 AND ${CMAKE_PATCH_VERSION} GREATER 0))
         cmake_policy(SET CMP0008 OLD)
     endif()
 
     # disable autolinking to qtmain as we have our own main() functions (new in Qt 5.1)
-    if((${CMAKE_MAJOR_VERSION} EQUAL 2 OR ${CMAKE_MAJOR_VERSION} GREATER 2) AND
-       (${CMAKE_MINOR_VERSION} EQUAL 8 OR ${CMAKE_MINOR_VERSION} GREATER 8) AND
-        ${CMAKE_PATCH_VERSION} GREATER 10)
+    if(${CMAKE_MAJOR_VERSION} GREATER 2 OR
+        (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} GREATER 8) OR
+        (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 8 AND ${CMAKE_PATCH_VERSION} GREATER 9))
         cmake_policy(SET CMP0020 OLD)
     endif()
     # nicer version check - but needs at least CMake 2.6.2? Worth upgrading the requirements?
     #if("${CMAKE_VERSION}" VERSION_GREATER 2.8.10)
-
+    # or even easier (available in cmake-2.6)
+    #if(POLICY CMPxyzw)
 
 endif()