使用mingw编译websocketpp示例代码时未定义对`std :: errc :: operation_canceled`的引用 [英] undefined reference to `std::errc::operation_canceled` when compiling websocketpp example code with mingw
问题描述
我正在尝试使用websocketpp编写一个跨平台程序，该程序使用websockets进行通信.我想使用基于asio的传输层.
I'm trying to use websocketpp to write a cross-platform program that communicates using websockets. I would like to use the asio-based transport layer.
我的理解是，如果我使用的是C ++ 11，则可以将asio配置为独立于boost并使用std::thread，并且websocketpp在这种情况下类似地仅是头文件.
My understanding was that if I am using C++11, I can configure asio to stand-alone from boost and use std::thread, and that websocketpp is similarly header-only under such circumstances.
但是，当我实际上尝试以这种方式编译任何websocketpp教程时，例如tutorials/utility_client，它在g ++和clang上都能正常工作，但是在mingw上却出现奇怪的编译错误:
However, when I actually try to compile any of the websocketpp tutorials this way, such as the tutorials/utility_client, it works fine on g++ and clang, but I get strange compilation errors on mingw:
In file included from websocketpp-0.6.0/include/websocketpp/config/asio_no_tls_client.hpp:32:0,
from main.cpp:7:
websocketpp-0.6.0/include/websocketpp/transport/asio/endpoint.hpp: In member function ‘void websocketpp::transport::asio::endpoint<config>::handle_accept(websocketpp::transport::accept_handler, const error_code&)’:
websocketpp-0.6.0/include/websocketpp/transport/asio/endpoint.hpp:764:28: error: ‘operation_canceled’ is not a member of ‘std::errc’
if (asio_ec == lib::asio::errc::operation_canceled) {
^
我正在摸索这是什么意思，以及如何解决这个问题.这似乎与缺乏增强功能无关-根据
I'm scratching my head as to what this means and how to fix this. This doesn't appear to be related to the lack of boost -- std::errc::operation_canceled appears to be a well-defined C++11 symbol according to this, not always accurate, website. Does this mean my toolchain is broken / defective? I tried installing a different version of the mingw toolchain and it had the same problem.
我找不到对没有类似符号的类似问题的任何人的引用，所以也许我在配置库时出错了?这是我的编译行:
I couldn't find any references to anyone having similar problems with this symbol not being found, so maybe I'm configuring the library wrong? Here is my compilation line:
"$CXX" -std=c++11 -Iasio-1.10.6/include -Iwebsocketpp-0.6.0/include -D_WEBSOCKETPP_CPP11_THREAD_=1 -DASIO_STANDALONE=1 main.cpp -lpthread
我创建了一个存储库以帮助重现我的确切设置，但是这里没有太多内容- -我从各自的存储库中下载了最新发行版中的两个库.由于编译死于main.cpp的其中一个主体，因此似乎并不十分相关，但我只是在使用其教程代码.
I made a repository to assist in reproducing my exact setup, but there's not much going on here -- I downloaded both libs from most recent releases from their respective repos. Since compilation dies in one of the includes the body of main.cpp seems not terribly relevant, but I am just using their tutorial code.
如果有人可以就此给我打个电话，我将不胜感激. :)
If anyone could throw me a line on this I would greatly appreciate it. :)
我不太确定，但是我在mingw-w64上报告了此错误: http://sourceforge.net/p/mingw-w64/support-requests/105/
I am not really sure but I have reported this as a bug at mingw-w64: http://sourceforge.net/p/mingw-w64/support-requests/105/
推荐答案
我已经将其报告为mingw-w64中的错误
I have reported this as a bug at mingw-w64
mingw-w64编译器不符合C ++ 11，没有定义此错误代码， 但是人们已经知道了，这是故意的. (尽管随便我不 知道为什么他们无法修复它.)
The mingw-w64 compiler is C++11 non-compliant in not defining this error-code, but the folks already know that and it's deliberate. (Although offhand I don't know why they couldn't fix it.)
相关的头文件是:
<toochain_dir>/mingw64/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/error_constants.h
这是enum class std::errc的定义:
// Most of the commented-out error codes are socket-related and could be
// replaced by Winsock WSA-prefixed equivalents.
enum class errc
{
// address_family_not_supported = EAFNOSUPPORT,
// address_in_use = EADDRINUSE,
// address_not_available = EADDRNOTAVAIL,
// already_connected = EISCONN,
argument_list_too_long = E2BIG,
argument_out_of_domain = EDOM,
bad_address = EFAULT,
bad_file_descriptor = EBADF,
// bad_message = EBADMSG,
broken_pipe = EPIPE,
// connection_aborted = ECONNABORTED,
// connection_already_in_progress = EALREADY,
// connection_refused = ECONNREFUSED,
// connection_reset = ECONNRESET,
// cross_device_link = EXDEV,
// destination_address_required = EDESTADDRREQ,
device_or_resource_busy = EBUSY,
directory_not_empty = ENOTEMPTY,
executable_format_error = ENOEXEC,
file_exists = EEXIST,
file_too_large = EFBIG,
filename_too_long = ENAMETOOLONG,
function_not_supported = ENOSYS,
// host_unreachable = EHOSTUNREACH,
// identifier_removed = EIDRM,
illegal_byte_sequence = EILSEQ,
inappropriate_io_control_operation = ENOTTY,
interrupted = EINTR,
invalid_argument = EINVAL,
invalid_seek = ESPIPE,
io_error = EIO,
is_a_directory = EISDIR,
// message_size = EMSGSIZE,
// network_down = ENETDOWN,
// network_reset = ENETRESET,
// network_unreachable = ENETUNREACH,
// no_buffer_space = ENOBUFS,
#ifdef _GLIBCXX_HAVE_ECHILD
no_child_process = ECHILD,
#endif
// no_link = ENOLINK,
no_lock_available = ENOLCK,
// no_message_available = ENODATA,
// no_message = ENOMSG,
// no_protocol_option = ENOPROTOOPT,
#ifdef _GLIBCXX_HAVE_ENOSPC
no_space_on_device = ENOSPC,
#endif
// no_stream_resources = ENOSR,
no_such_device_or_address = ENXIO,
no_such_device = ENODEV,
no_such_file_or_directory = ENOENT,
no_such_process = ESRCH,
not_a_directory = ENOTDIR,
// not_a_socket = ENOTSOCK,
// not_a_stream = ENOSTR,
// not_connected = ENOTCONN,
not_enough_memory = ENOMEM,
#ifdef _GLIBCXX_HAVE_ENOTSUP
not_supported = ENOTSUP,
#endif
// operation_canceled = ECANCELED,
// operation_in_progress = EINPROGRESS,
#ifdef _GLIBCXX_HAVE_EPERM
operation_not_permitted = EPERM,
#endif
// operation_not_supported = EOPNOTSUPP,
#ifdef _GLIBCXX_HAVE_EWOULDBLOCK
operation_would_block = EWOULDBLOCK,
#endif
// owner_dead = EOWNERDEAD,
permission_denied = EACCES,
// protocol_error = EPROTO,
// protocol_not_supported = EPROTONOSUPPORT,
read_only_file_system = EROFS,
resource_deadlock_would_occur = EDEADLK,
resource_unavailable_try_again = EAGAIN,
result_out_of_range = ERANGE,
// state_not_recoverable = ENOTRECOVERABLE,
// stream_timeout = ETIME,
// text_file_busy = ETXTBSY,
#ifdef _GLIBCXX_HAVE_ETIMEDOUT
timed_out = ETIMEDOUT,
#endif
too_many_files_open_in_system = ENFILE,
too_many_files_open = EMFILE,
too_many_links = EMLINK
// too_many_symbolic_link_levels = ELOOP,
#ifdef _GLIBCXX_HAVE_EOVERFLOW
,
value_too_large = EOVERFLOW
#endif
// wrong_protocol_type = EPROTOTYPE
};
您看到operation_canceled是其中之一.
根据此处的建议，您将需要使用winsock错误代码WSAECANCELLED，
在winerror.h中定义.如果您想要便携性，那么您当然需要
根据主机OS的编译时确定，使用此命令，而不使用std::errc::operation_canceled作为条件.
As suggested there, you will need to use the winsock error code WSAECANCELLED,
defined in winerror.h. If you want portability, of course you'll need to
make this use rather than std::errc::operation_canceled conditional upon compiletime determination of the host OS.
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