asio::ip::address_v6.hpp: Missing braces around anonymous union

[Peter Jansson <info@…>]

Using "g++ (GCC) 4.4.0" in MinGW on WindowsXP with "-Wall -Wextra" compiler options, we get annoying warnings from "C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp":

C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp: In constructor 'boost::asio::ip::address_v6::address_v6()':
C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp:58: warning: missing braces around initializer for 'in6_addr::<anonymous union>'
C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp:58: warning: missing braces around initializer for 'u_char [16]'
C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp: In static member function 'static boost::asio::ip::address_v6 boost::asio::ip::address_v6::loopback()':
C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp:355: warning: missing braces around initializer for 'in6_addr::<anonymous union>'
C:/Boost/include/boost-1_41/boost/asio/ip/address_v6.hpp:355: warning: missing braces around initializer for 'u_char [16]'

Perhaps we can get rid of these warnings to Boost 1.42.0 ?

[chris_kohlhoff]

This not a trivial fix, because the braced initialisers are actually hidden by system-provided macros. Will look at in the future.

[jlcastillo@…]

I fixed it just modifying the ws2tcpip.h header in MinGW like this:

#define IN6ADDR_ANY_INIT { 0 } #define IN6ADDR_LOOPBACK_INIT { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } JOSE: #define IN6ADDR_ANY_INIT 0 #define IN6ADDR_LOOPBACK_INIT 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1

You could also do it in Boost Asio address_v6.ipp, if you don't want to change MinGW headers, undefining and defining again. Anyway, I think it's a problem of MinGW, not Boost Asio.

[jlcastillo@…]

Sorry there was a problem with the formatting, this is the code of my fix:

//#define IN6ADDR_ANY_INIT        { 0 }
//#define IN6ADDR_LOOPBACK_INIT   { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }
// JOSE:
#define IN6ADDR_ANY_INIT        {{{0}}}
#define IN6ADDR_LOOPBACK_INIT   {{{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}}}

[chris_kohlhoff]

(In [69194]) Changes for asio version 1.5.0:

• Added support for timeouts on socket iostreams, such as ip::tcp::iostream. A timeout is set by calling expires_at() or expires_from_now() to establish a deadline. Any socket operations which occur past the deadline will put the iostream into a bad state.

• Added a new error() member function to socket iostreams, for retrieving the error code from the most recent system call.

• Added a new basic_deadline_timer::cancel_one() function. This function lets you cancel a single waiting handler on a timer. Handlers are cancelled in FIFO order.

• Added a new transfer_exactly() completion condition. This can be used to send or receive a specified number of bytes even if the total size of the buffer (or buffer sequence) is larger.

• Added new free functions connect() and async_connect(). These operations try each endpoint in a list until the socket is successfully connected.

• Extended the buffer_size() function so that it works for buffer sequences in addition to individual buffers.

• Added a new buffer_copy() function that can be used to copy the raw bytes between individual buffers and buffer sequences.

• Added new non-throwing overloads of read(), read_at(), write() and write_at() that do not require a completion condition.

• Added friendlier compiler errors for when a completion handler does not meet the necessary type requirements. When C++0x is available (currently supported for g++ 4.5 or later, and MSVC 10), static_assert is also used to generate an informative error message. Checking may be disabled by defining BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS.

• Made the is_loopback(), is_unspecified() and is_multicast() functions consistently available across the ip::address, ip::address_v4 and ip::address_v6 classes. Refs #3939.

• Added new non_blocking() functions for managing the non-blocking behaviour of a socket or descriptor. The io_control() commands named non_blocking_io are now deprecated in favour of these new functions.

• Added new native_non_blocking() functions for managing the non-blocking mode of the underlying socket or descriptor. These functions are intended to allow the encapsulation of arbitrary non-blocking system calls as asynchronous operations, in a way that is transparent to the user of the socket object. The functions have no effect on the behaviour of the synchronous operations of the socket or descriptor. Refs #3307.

• Added the io_control() member function for socket acceptors. Refs #3297.

• For consistency with the C++0x standard library, deprecated the native_type typedefs in favour of native_handle_type, and the native() member functions in favour of native_handle().

• Added a release() member function to posix descriptors. This function releases ownership of the underlying native descriptor to the caller. Refs #3900.

• Added support for sequenced packet sockets (SOCK_SEQPACKET).

• Added a new io_service::stopped() function that can be used to determine whether the io_service has stopped (i.e. a reset() call is needed prior to any further calls to run(), run_one(), poll() or poll_one()).

• Reduced the copying of handler function objects.

• Added support for C++0x move construction to further reduce copying of handler objects. Move support is enabled when compiling in -std=c++0x mode on g++ 4.5 or higher, or when using MSVC10.

• Removed the dependency on OS-provided macros for the well-known IPv4 and IPv6 addresses. This should eliminate the annoying "missing braces around initializer" warnings. Refs #3741.

• Reduced the size of ip::basic_endpoint<> objects (such as ip::tcp::endpoint and ip::udp::endpoint).

• Changed the reactor backends to assume that any descriptors or sockets added using assign() may have been dup()-ed, and so require explicit deregistration from the reactor. Refs #4971.

• Changed the SSL error category to return error strings from the OpenSSL library.

• Changed the separate compilation support such that, to use Asio's SSL capabilities, you should also include 'asio/ssl/impl/src.hpp in one source file in your program.

• Removed the deprecated member functions named io_service(). The get_io_service() member functions should be used instead.

• Removed the deprecated typedefs resolver_query and resolver_iterator from the ip::tcp, ip::udp and ip::icmp classes.

• Fixed a compile error on some versions of g++ due to anonymous enums. Refs #4883.

• Added an explicit cast to the FIONBIO constant to int to suppress a compiler warning on some platforms. Refs #5128.

• Fixed warnings reported by g++'s -Wshadow compiler option. Refs #3905.

[chris_kohlhoff]

Applied to release branch in [72428].