From Jan Klimke, "i noticed, that there are a couple of additional flaws when building osg for Mac OS X 10.10 Yosemite.

The mac os sdk version is recognized by the current CMAKE script as 10.1 instead of 10.10 since it cuts the version string from the 4th place. I introduced a more reliable version checking based on splitting the returned version code into MAJOR MINOR and PATCH parts and reassemble the OSG sdk version afterwards.

I replaced the existing CMake code against the following (returning now version 10.10 as expected):

 # Determine the canonical name of the selected Platform SDK
   EXECUTE_PROCESS(COMMAND "/usr/bin/sw_vers" "-productVersion"
                   OUTPUT_VARIABLE OSG_OSX_SDK_NAME
                   OUTPUT_STRIP_TRAILING_WHITESPACE)
   STRING(REPLACE "." ";" MACOS_VERSION_LIST ${OSG_OSX_SDK_NAME})
   LIST(GET MACOS_VERSION_LIST 0 MACOS_VERSION_MAJOR)
   LIST(GET MACOS_VERSION_LIST 1 MACOS_VERSION_MINOR)
   LIST(GET MACOS_VERSION_LIST 2 MACOS_VERSION_PATCH)

   SET(OSG_OSX_SDK_NAME "macosx${MACOS_VERSION_MAJOR}.${MACOS_VERSION_MINOR}")

Also i added the check for the new Version to some more find scripts.

Additionally the nil object in Objective C now seems to be equivalent with a null_ptr that cannot be passed as GLInt anymore. So i switched this in the PixelBufferCocoa.mm to pass a zero instead of nil.
"


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14527 16af8721-9629-0410-8352-f15c8da7e697