cmake HAVE_FLAG_STD_CXX17 examples

v6d-io/v6d CMakeLists.txt :252 

check_cxx_compiler_flag(-std=c++17 HAVE_FLAG_STD_CXX17)

v6d-io/v6d java/core/CMakeLists.txt :95 

check_cxx_compiler_flag(-std=c++17 HAVE_FLAG_STD_CXX17)