arm linux c++11編譯

include(CheckCXXCompilerFlag) 
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11) 
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X) 
if(COMPILER_SUPPORTS_CXX11) 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11") 
elseif(COMPILER_SUPPORTS_CXX0X) 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x") 
else() 
    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.") 
endif()