From Ulrich Hertlein and Stephan Huber, improves to iOS build

src/osgDB/CMakeLists.txt

@@ -32,6 +32,14 @@ ELSE ()
     ADD_DEFINITIONS(-DOSG_LIBRARY_STATIC)
 ENDIF()
 
+IF (APPLE) 
+   IF(OSG_BUILD_PLATFORM_IPHONE OR OSG_BUILD_PLATFORM_IPHONE_SIMULATOR)
+     # compile FileUtils.cpp as objective-c++
+     SET_SOURCE_FILES_PROPERTIES(FileUtils.cpp
+       PROPERTIES COMPILE_FLAGS "-x objective-c++"
+     )
+   ENDIF()
+ENDIF()
 
 
 SET(LIB_NAME osgDB)