In file included from include/boost/asio/impl/io_service.ipp:28,
                 from include/boost/asio/io_service.hpp:641,
                 from include/boost/asio/basic_io_object.hpp:20,
                 from include/boost/asio/basic_socket.hpp:24,
                 from include/boost/asio/basic_datagram_socket.hpp:25,
                 from include/boost/asio/ip/udp.hpp:20,
include/boost/asio/detail/win_iocp_io_service.hpp:726: warning: 'boost::asio::detail::win_iocp_io_service::operation' is already a friend of 'boost::asio::detail::win_iocp_io_service'

In file included from include/boost/asio/ip/address.hpp:31,
                 from include/boost/asio/ip/basic_endpoint.hpp:34,
                 from include/boost/asio/ip/udp.hpp:21,
include/boost/asio/ip/address_v6.hpp: In constructor 'boost::asio::ip::address_v6::address_v6()':
include/boost/asio/ip/address_v6.hpp:62: warning: missing braces around initializer for 'in6_addr::<anonymous union>'
include/boost/asio/ip/address_v6.hpp:62: warning: missing braces around initializer for 'u_char [16]'
include/boost/asio/ip/address_v6.hpp: In static member function 'static boost::asio::ip::address_v6 boost::asio::ip::address_v6::loopback()':
include/boost/asio/ip/address_v6.hpp:359: warning: missing braces around initializer for 'in6_addr::<anonymous union>'
include/boost/asio/ip/address_v6.hpp:359: warning: missing braces around initializer for 'u_char [16]'