cmake OPENMP_HAVE_STD_CPP11_FLAG examples

llvm-mirror/openmp CMakeLists.txt :75 

elseif (NOT OPENMP_HAVE_STD_CPP11_FLAG)

llvm-mirror/openmp cmake/config-ix.cmake :18 

check_cxx_compiler_flag(-std=c++11 OPENMP_HAVE_STD_CPP11_FLAG)