Suggest to support Cygwin 64bit

[youngwolf-project]

Standard alone edition of asio (branch ci-mingw) has supported both 32 and 64bit Mingw, and 32bit Cygwin is always supported, but why we left 64bit Cygwin behind?

asio/asio/include/asio/detail/impl/winsock_init.ipp:35:30: error: cannot convert ‘long int*’ to ‘volatile int*’
35 | if (::InterlockedIncrement(&d.init_count_) == 1)

did I missed something, for example, a definition of a macro?

[Lastique]

The problem is that Cygwin64 is an LP64 target, unlike native Windows/MSVC and MinGW-w64, which are LLP64. ASIO uses long int and expects it to be an equivalent of DWORD in some places, which it is not on Cygwin64.

[Lastique]

Here is the error output of Boost.Log build on Cygwin64:

In file included from ./boost/asio/detail/winsock_init.hpp:125,
                 from ./boost/asio/ip/address_v4.hpp:25,
                 from ./boost/asio/ip/address.hpp:25,
                 from /cygdrive/d/a/log/log/boost-root/libs/log/src/setup/init_from_settings.cpp:66:
./boost/asio/detail/impl/winsock_init.ipp: In static member function 'static void boost::asio::detail::winsock_init_base::startup(data&, unsigned char, unsigned char)':
./boost/asio/detail/impl/winsock_init.ipp:36:29: error: no matching function for call to '_InterlockedIncrement(long int*)'
   36 |   if (::InterlockedIncrement(&d.init_count_) == 1)
      |       ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/w32api/windows.h:70,
                 from ./boost/core/detail/sp_win32_sleep.hpp:19,
                 from ./boost/core/detail/sp_thread_yield.hpp:30,
                 from ./boost/core/yield_primitives.hpp:9,
                 from ./boost/smart_ptr/detail/yield_k.hpp:22,
                 from ./boost/smart_ptr/detail/spinlock_std_atomic.hpp:18,
                 from ./boost/smart_ptr/detail/spinlock.hpp:40,
                 from ./boost/smart_ptr/detail/spinlock_pool.hpp:25,
                 from ./boost/smart_ptr/shared_ptr.hpp:28,
                 from ./boost/smart_ptr/make_shared_object.hpp:14,
                 from /cygdrive/d/a/log/log/boost-root/libs/log/src/setup/init_from_settings.cpp:40:
/usr/include/w32api/winbase.h:3542:29: note: candidate: 'long unsigned int _InterlockedIncrement(volatile long unsigned int*)' (near match)
 3542 |   FORCEINLINE unsigned long InterlockedIncrement (unsigned long volatile *Addend) {
      |                             ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3542:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:36:30: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   36 |   if (::InterlockedIncrement(&d.init_count_) == 1)
      |                              ^~~~~~~~~~~~~~
      |                              |
      |                              long int*
/usr/include/w32api/winbase.h:3551:32: note: candidate: 'long long unsigned int _InterlockedIncrement(volatile long long unsigned int*)' (near match)
 3551 |   FORCEINLINE unsigned __int64 InterlockedIncrement (unsigned __int64 volatile *Addend) {
      |                                ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3551:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:36:30: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   36 |   if (::InterlockedIncrement(&d.init_count_) == 1)
      |                              ^~~~~~~~~~~~~~
      |                              |
      |                              long int*
./boost/asio/detail/impl/winsock_init.ipp:40:26: error: no matching function for call to '_InterlockedExchange(long int*, long int&)'
   40 |     ::InterlockedExchange(&d.result_, result);
      |     ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3587:32: note: candidate: 'long long unsigned int _InterlockedExchange(volatile long long unsigned int*, long long unsigned int)' (near match)
 3587 |   FORCEINLINE unsigned __int64 InterlockedExchange (unsigned __int64 volatile *Target, unsigned __int64 Value) {
      |                                ^~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3587:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:40:27: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   40 |     ::InterlockedExchange(&d.result_, result);
      |                           ^~~~~~~~~~
      |                           |
      |                           long int*
/usr/include/w32api/winbase.h:3578:29: note: candidate: 'long unsigned int _InterlockedExchange(volatile long unsigned int*, long unsigned int)' (near match)
 3578 |   FORCEINLINE unsigned long InterlockedExchange (unsigned long volatile *Target, unsigned long Value) {
      |                             ^~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3578:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:40:27: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   40 |     ::InterlockedExchange(&d.result_, result);
      |                           ^~~~~~~~~~
      |                           |
      |                           long int*
./boost/asio/detail/impl/winsock_init.ipp: In static member function 'static void boost::asio::detail::winsock_init_base::manual_startup(data&)':
./boost/asio/detail/impl/winsock_init.ipp:46:29: error: no matching function for call to '_InterlockedIncrement(long int*)'
   46 |   if (::InterlockedIncrement(&d.init_count_) == 1)
      |       ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3542:29: note: candidate: 'long unsigned int _InterlockedIncrement(volatile long unsigned int*)' (near match)
 3542 |   FORCEINLINE unsigned long InterlockedIncrement (unsigned long volatile *Addend) {
      |                             ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3542:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:46:30: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   46 |   if (::InterlockedIncrement(&d.init_count_) == 1)
      |                              ^~~~~~~~~~~~~~
      |                              |
      |                              long int*
/usr/include/w32api/winbase.h:3551:32: note: candidate: 'long long unsigned int _InterlockedIncrement(volatile long long unsigned int*)' (near match)
 3551 |   FORCEINLINE unsigned __int64 InterlockedIncrement (unsigned __int64 volatile *Addend) {
      |                                ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3551:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:46:30: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   46 |   if (::InterlockedIncrement(&d.init_count_) == 1)
      |                              ^~~~~~~~~~~~~~
      |                              |
      |                              long int*
./boost/asio/detail/impl/winsock_init.ipp:48:26: error: no matching function for call to '_InterlockedExchange(long int*, int)'
   48 |     ::InterlockedExchange(&d.result_, 0);
      |     ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3587:32: note: candidate: 'long long unsigned int _InterlockedExchange(volatile long long unsigned int*, long long unsigned int)' (near match)
 3587 |   FORCEINLINE unsigned __int64 InterlockedExchange (unsigned __int64 volatile *Target, unsigned __int64 Value) {
      |                                ^~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3587:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:48:27: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   48 |     ::InterlockedExchange(&d.result_, 0);
      |                           ^~~~~~~~~~
      |                           |
      |                           long int*
/usr/include/w32api/winbase.h:3578:29: note: candidate: 'long unsigned int _InterlockedExchange(volatile long unsigned int*, long unsigned int)' (near match)
 3578 |   FORCEINLINE unsigned long InterlockedExchange (unsigned long volatile *Target, unsigned long Value) {
      |                             ^~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3578:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:48:27: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   48 |     ::InterlockedExchange(&d.result_, 0);
      |                           ^~~~~~~~~~
      |                           |
      |                           long int*
./boost/asio/detail/impl/winsock_init.ipp: In static member function 'static void boost::asio::detail::winsock_init_base::cleanup(data&)':
./boost/asio/detail/impl/winsock_init.ipp:54:29: error: no matching function for call to '_InterlockedDecrement(long int*)'
   54 |   if (::InterlockedDecrement(&d.init_count_) == 0)
      |       ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3560:29: note: candidate: 'long unsigned int _InterlockedDecrement(volatile long unsigned int*)' (near match)
 3560 |   FORCEINLINE unsigned long InterlockedDecrement (unsigned long volatile *Addend) {
      |                             ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3560:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:54:30: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   54 |   if (::InterlockedDecrement(&d.init_count_) == 0)
      |                              ^~~~~~~~~~~~~~
      |                              |
      |                              long int*
/usr/include/w32api/winbase.h:3569:32: note: candidate: 'long long unsigned int _InterlockedDecrement(volatile long long unsigned int*)' (near match)
 3569 |   FORCEINLINE unsigned __int64 InterlockedDecrement (unsigned __int64 volatile *Addend) {
      |                                ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3569:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:54:30: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   54 |   if (::InterlockedDecrement(&d.init_count_) == 0)
      |                              ^~~~~~~~~~~~~~
      |                              |
      |                              long int*
./boost/asio/detail/impl/winsock_init.ipp: In static member function 'static void boost::asio::detail::winsock_init_base::manual_cleanup(data&)':
./boost/asio/detail/impl/winsock_init.ipp:62:25: error: no matching function for call to '_InterlockedDecrement(long int*)'
   62 |   ::InterlockedDecrement(&d.init_count_);
      |   ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3560:29: note: candidate: 'long unsigned int _InterlockedDecrement(volatile long unsigned int*)' (near match)
 3560 |   FORCEINLINE unsigned long InterlockedDecrement (unsigned long volatile *Addend) {
      |                             ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3560:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:62:26: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   62 |   ::InterlockedDecrement(&d.init_count_);
      |                          ^~~~~~~~~~~~~~
      |                          |
      |                          long int*
/usr/include/w32api/winbase.h:3569:32: note: candidate: 'long long unsigned int _InterlockedDecrement(volatile long long unsigned int*)' (near match)
 3569 |   FORCEINLINE unsigned __int64 InterlockedDecrement (unsigned __int64 volatile *Addend) {
      |                                ^~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3569:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:62:26: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   62 |   ::InterlockedDecrement(&d.init_count_);
      |                          ^~~~~~~~~~~~~~
      |                          |
      |                          long int*
./boost/asio/detail/impl/winsock_init.ipp: In static member function 'static void boost::asio::detail::winsock_init_base::throw_on_error(data&)':
./boost/asio/detail/impl/winsock_init.ipp:67:41: error: no matching function for call to '_InterlockedExchangeAdd(long int*, int)'
   67 |   long result = ::InterlockedExchangeAdd(&d.result_, 0);
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3617:32: note: candidate: 'long long unsigned int _InterlockedExchangeAdd(volatile long long unsigned int*, long long unsigned int)' (near match)
 3617 |   FORCEINLINE unsigned __int64 InterlockedExchangeAdd (unsigned __int64 volatile *Addend, unsigned __int64 Value) {
      |                                ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3617:32: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:67:42: error: invalid conversion from 'long int*' to 'volatile long long unsigned int*' [-fpermissive]
   67 |   long result = ::InterlockedExchangeAdd(&d.result_, 0);
      |                                          ^~~~~~~~~~
      |                                          |
      |                                          long int*
/usr/include/w32api/winbase.h:3600:29: note: candidate: 'long unsigned int _InterlockedExchangeAdd(volatile long unsigned int*, long unsigned int)' (near match)
 3600 |   FORCEINLINE unsigned long InterlockedExchangeAdd (unsigned long volatile *Addend, unsigned long Value) {
      |                             ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/w32api/winbase.h:3600:29: note:   conversion of argument 1 would be ill-formed:
./boost/asio/detail/impl/winsock_init.ipp:67:42: error: invalid conversion from 'long int*' to 'volatile long unsigned int*' [-fpermissive]
   67 |   long result = ::InterlockedExchangeAdd(&d.result_, 0);
      |                                          ^~~~~~~~~~
      |                                          |
      |                                          long int*
In file included from ./boost/asio/detail/socket_ops.hpp:378,
                 from ./boost/asio/ip/impl/address_v4.ipp:23,
                 from ./boost/asio/ip/address_v4.hpp:364:
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::close(boost::asio::detail::socket_type, state_type&, bool, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:339:33: error: cannot convert 'boost::asio::detail::ioctl_arg_type*' {aka 'long unsigned int*'} to '__ms_u_long*' {aka 'unsigned int*'}
  339 |       ::ioctlsocket(s, FIONBIO, &arg);
      |                                 ^~~~
      |                                 |
      |                                 boost::asio::detail::ioctl_arg_type* {aka long unsigned int*}
In file included from ./boost/asio/detail/socket_types.hpp:33,
                 from ./boost/asio/ip/address_v4.hpp:23:
/usr/include/w32api/winsock2.h:1007:76: note:   initializing argument 3 of 'int ioctlsocket(SOCKET, int, __ms_u_long*)'
 1007 |   WINSOCK_API_LINKAGE int WSAAPI ioctlsocket(SOCKET s,__LONG32 cmd,u_long *argp);
      |                                                                            ^
./boost/asio/detail/impl/socket_ops.ipp: In function 'bool boost::asio::detail::socket_ops::set_user_non_blocking(boost::asio::detail::socket_type, state_type&, bool, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:392:42: error: cannot convert 'boost::asio::detail::ioctl_arg_type*' {aka 'long unsigned int*'} to '__ms_u_long*' {aka 'unsigned int*'}
  392 |   int result = ::ioctlsocket(s, FIONBIO, &arg);
      |                                          ^~~~
      |                                          |
      |                                          boost::asio::detail::ioctl_arg_type* {aka long unsigned int*}
/usr/include/w32api/winsock2.h:1007:76: note:   initializing argument 3 of 'int ioctlsocket(SOCKET, int, __ms_u_long*)'
 1007 |   WINSOCK_API_LINKAGE int WSAAPI ioctlsocket(SOCKET s,__LONG32 cmd,u_long *argp);
      |                                                                            ^
./boost/asio/detail/impl/socket_ops.ipp: In function 'bool boost::asio::detail::socket_ops::set_internal_non_blocking(boost::asio::detail::socket_type, state_type&, bool, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:468:42: error: cannot convert 'boost::asio::detail::ioctl_arg_type*' {aka 'long unsigned int*'} to '__ms_u_long*' {aka 'unsigned int*'}
  468 |   int result = ::ioctlsocket(s, FIONBIO, &arg);
      |                                          ^~~~
      |                                          |
      |                                          boost::asio::detail::ioctl_arg_type* {aka long unsigned int*}
/usr/include/w32api/winsock2.h:1007:76: note:   initializing argument 3 of 'int ioctlsocket(SOCKET, int, __ms_u_long*)'
 1007 |   WINSOCK_API_LINKAGE int WSAAPI ioctlsocket(SOCKET s,__LONG32 cmd,u_long *argp);
      |                                                                            ^
./boost/asio/detail/impl/socket_ops.ipp: In function 'bool boost::asio::detail::socket_ops::non_blocking_connect(boost::asio::detail::socket_type, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:643:59: error: cannot convert 'timeval*' to 'const TIMEVAL*'
  643 |   int ready = ::select(s + 1, 0, &write_fds, &except_fds, &zero_timeout);
      |                                                           ^~~~~~~~~~~~~
      |                                                           |
      |                                                           timeval*
/usr/include/w32api/winsock2.h:1031:116: note:   initializing argument 5 of 'int select(int, fd_set*, fd_set*, fd_set*, const TIMEVAL*)'
 1031 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const TIMEVAL *timeout);
      |                                                                                                     ~~~~~~~~~~~~~~~^~~~~~~
./boost/asio/detail/impl/socket_ops.ipp: In function 'bool boost::asio::detail::socket_ops::sockatmark(boost::asio::detail::socket_type, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:707:45: error: cannot convert 'boost::asio::detail::ioctl_arg_type*' {aka 'long unsigned int*'} to '__ms_u_long*' {aka 'unsigned int*'}
  707 |   int result = ::ioctlsocket(s, SIOCATMARK, &value);
      |                                             ^~~~~~
      |                                             |
      |                                             boost::asio::detail::ioctl_arg_type* {aka long unsigned int*}
/usr/include/w32api/winsock2.h:1007:76: note:   initializing argument 3 of 'int ioctlsocket(SOCKET, int, __ms_u_long*)'
 1007 |   WINSOCK_API_LINKAGE int WSAAPI ioctlsocket(SOCKET s,__LONG32 cmd,u_long *argp);
      |                                                                            ^
./boost/asio/detail/impl/socket_ops.ipp: In function 'size_t boost::asio::detail::socket_ops::available(boost::asio::detail::socket_type, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:734:43: error: cannot convert 'boost::asio::detail::ioctl_arg_type*' {aka 'long unsigned int*'} to '__ms_u_long*' {aka 'unsigned int*'}
  734 |   int result = ::ioctlsocket(s, FIONREAD, &value);
      |                                           ^~~~~~
      |                                           |
      |                                           boost::asio::detail::ioctl_arg_type* {aka long unsigned int*}
/usr/include/w32api/winsock2.h:1007:76: note:   initializing argument 3 of 'int ioctlsocket(SOCKET, int, __ms_u_long*)'
 1007 |   WINSOCK_API_LINKAGE int WSAAPI ioctlsocket(SOCKET s,__LONG32 cmd,u_long *argp);
      |                                                                            ^
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::ioctl(boost::asio::detail::socket_type, state_type&, int, boost::asio::detail::ioctl_arg_type*, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:2198:38: error: cannot convert 'boost::asio::detail::ioctl_arg_type*' {aka 'long unsigned int*'} to '__ms_u_long*' {aka 'unsigned int*'}
 2198 |   int result = ::ioctlsocket(s, cmd, arg);
      |                                      ^~~
      |                                      |
      |                                      boost::asio::detail::ioctl_arg_type* {aka long unsigned int*}
/usr/include/w32api/winsock2.h:1007:76: note:   initializing argument 3 of 'int ioctlsocket(SOCKET, int, __ms_u_long*)'
 1007 |   WINSOCK_API_LINKAGE int WSAAPI ioctlsocket(SOCKET s,__LONG32 cmd,u_long *argp);
      |                                                                            ^
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::select(int, fd_set*, fd_set*, fd_set*, timeval*, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:2267:61: error: cannot convert 'timeval*' to 'const TIMEVAL*'
 2267 |   int result = ::select(nfds, readfds, writefds, exceptfds, timeout);
      |                                                             ^~~~~~~
      |                                                             |
      |                                                             timeval*
/usr/include/w32api/winsock2.h:1031:116: note:   initializing argument 5 of 'int select(int, fd_set*, fd_set*, fd_set*, const TIMEVAL*)'
 1031 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const TIMEVAL *timeout);
      |                                                                                                     ~~~~~~~~~~~~~~~^~~~~~~
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::poll_read(boost::asio::detail::socket_type, state_type, int, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:2304:44: error: cannot convert 'timeval*' to 'const TIMEVAL*'
 2304 |   int result = ::select(s + 1, &fds, 0, 0, timeout);
      |                                            ^~~~~~~
      |                                            |
      |                                            timeval*
/usr/include/w32api/winsock2.h:1031:116: note:   initializing argument 5 of 'int select(int, fd_set*, fd_set*, fd_set*, const TIMEVAL*)'
 1031 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const TIMEVAL *timeout);
      |                                                                                                     ~~~~~~~~~~~~~~~^~~~~~~
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::poll_write(boost::asio::detail::socket_type, state_type, int, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:2356:44: error: cannot convert 'timeval*' to 'const TIMEVAL*'
 2356 |   int result = ::select(s + 1, 0, &fds, 0, timeout);
      |                                            ^~~~~~~
      |                                            |
      |                                            timeval*
/usr/include/w32api/winsock2.h:1031:116: note:   initializing argument 5 of 'int select(int, fd_set*, fd_set*, fd_set*, const TIMEVAL*)'
 1031 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const TIMEVAL *timeout);
      |                                                                                                     ~~~~~~~~~~~~~~~^~~~~~~
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::poll_error(boost::asio::detail::socket_type, state_type, int, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:2408:44: error: cannot convert 'timeval*' to 'const TIMEVAL*'
 2408 |   int result = ::select(s + 1, 0, 0, &fds, timeout);
      |                                            ^~~~~~~
      |                                            |
      |                                            timeval*
/usr/include/w32api/winsock2.h:1031:116: note:   initializing argument 5 of 'int select(int, fd_set*, fd_set*, fd_set*, const TIMEVAL*)'
 1031 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const TIMEVAL *timeout);
      |                                                                                                     ~~~~~~~~~~~~~~~^~~~~~~
./boost/asio/detail/impl/socket_ops.ipp: In function 'int boost::asio::detail::socket_ops::poll_connect(boost::asio::detail::socket_type, int, boost::system::error_code&)':
./boost/asio/detail/impl/socket_ops.ipp:2456:60: error: cannot convert 'timeval*' to 'const TIMEVAL*'
 2456 |   int result = ::select(s + 1, 0, &write_fds, &except_fds, timeout);
      |                                                            ^~~~~~~
      |                                                            |
      |                                                            timeval*
/usr/include/w32api/winsock2.h:1031:116: note:   initializing argument 5 of 'int select(int, fd_set*, fd_set*, fd_set*, const TIMEVAL*)'
 1031 |   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const TIMEVAL *timeout);
      |                                                                                                     ~~~~~~~~~~~~~~~^~~~~~~

I'll also mention that there are suggestions to treat Cygwin as a POSIX target rather than Windows, and even this PR to make the switch. Other Boost libraries, including Boost.System, on which Boost.ASIO relies, have switched to treating Cygwin as a POSIX target.