ovis: cmake: extend compatibility check and allow using OGRE1.11 (devel)

modules/ovis/CMakeLists.txt

@@ -5,9 +5,15 @@ find_package(OGRE 1.10 QUIET)
 if(NOT OGRE_FOUND)
   message(STATUS "Module opencv_ovis disabled because OGRE3D was not found")
   ocv_module_disable(ovis)
-elseif(OGRE_VERSION VERSION_LESS 1.10)
-  message(STATUS "Module opencv_ovis disabled because OGRE3D version is less than 1.10 (${OGRE_VERSION})")
+elseif(OGRE_VERSION VERSION_LESS 1.10 OR OGRE_VERSION VERSION_GREATER 2.0)
+  message(STATUS "Module opencv_ovis disabled because of incompatible OGRE3D version (${OGRE_VERSION})")
   ocv_module_disable(ovis)
+elseif(OGRE_VERSION VERSION_GREATER 1.10) # we need C++11 for OGRE 1.11
+  if(MSVC)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Qstd=c++11")
+  else()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+  endif()
 endif()
 
 include_directories(${OGRE_INCLUDE_DIRS}})