Just made quick test with cython 3.0.2 and indeed buid fails:

+ /usr/bin/python3 -sBm build -w --no-isolation
* Getting build dependencies for wheel...
* Building wheel...
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-cpython-38
creating build/lib.linux-x86_64-cpython-38/uvloop
copying uvloop/__init__.py -> build/lib.linux-x86_64-cpython-38/uvloop
copying uvloop/_noop.py -> build/lib.linux-x86_64-cpython-38/uvloop
copying uvloop/_testbase.py -> build/lib.linux-x86_64-cpython-38/uvloop
copying uvloop/_version.py -> build/lib.linux-x86_64-cpython-38/uvloop
running egg_info
creating uvloop.egg-info
writing uvloop.egg-info/PKG-INFO
writing dependency_links to uvloop.egg-info/dependency_links.txt
writing requirements to uvloop.egg-info/requires.txt
writing top-level names to uvloop.egg-info/top_level.txt
writing manifest file 'uvloop.egg-info/SOURCES.txt'
<string>:144: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
warning: uvloop/includes/consts.pxi:1:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:3:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:4:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:5:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:7:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:8:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:10:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:13:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:16:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:21:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:24:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:25:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310

Error compiling Cython file:
------------------------------------------------------------
...
# cython: language_level=3


from .includes cimport uv
^
------------------------------------------------------------

uvloop/loop.pxd:4:0: 'uvloop/includes.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
# cython: language_level=3


from .includes cimport uv
from .includes cimport system
^
------------------------------------------------------------

uvloop/loop.pxd:5:0: 'uvloop/includes.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
ctypedef object (*method3_t)(object, object, object, object)


cdef class Loop:
    cdef:
        uv.uv_loop_t *uvloop
        ^
------------------------------------------------------------

uvloop/loop.pxd:34:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
    cdef _init_debug_fields(self)

    cdef _on_wake(self)
    cdef _on_idle(self)

    cdef __run(self, uv.uv_run_mode)
                     ^
------------------------------------------------------------

uvloop/loop.pxd:136:21: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...

    cdef _on_wake(self)
    cdef _on_idle(self)

    cdef __run(self, uv.uv_run_mode)
    cdef _run(self, uv.uv_run_mode)
                    ^
------------------------------------------------------------

uvloop/loop.pxd:137:20: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
    cdef _getaddrinfo(self, object host, object port,
                      int family, int type,
                      int proto, int flags,
                      int unpack)

    cdef _getnameinfo(self, system.sockaddr *addr, int flags)
                            ^
------------------------------------------------------------

uvloop/loop.pxd:167:28: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
cdef class UVHandle:
    cdef:
        uv.uv_handle_t *_handle
        ^
------------------------------------------------------------

uvloop/handles/handle.pxd:3:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
cdef class UVStream(UVBaseTransport):
    cdef:
        uv.uv_shutdown_t _shutdown_req
        ^
------------------------------------------------------------

uvloop/handles/stream.pxd:3:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
cdef class TCPServer(UVStreamServer):
    cdef bind(self, system.sockaddr* addr, unsigned int flags=*)
                    ^
------------------------------------------------------------

uvloop/handles/tcp.pxd:2:20: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...

cdef class TCPTransport(UVStream):
    cdef:
        bint __peername_set
        bint __sockname_set
        system.sockaddr_storage __peername
        ^
------------------------------------------------------------

uvloop/handles/tcp.pxd:17:8: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
cdef class TCPTransport(UVStream):
    cdef:
        bint __peername_set
        bint __sockname_set
        system.sockaddr_storage __peername
        system.sockaddr_storage __sockname
        ^
------------------------------------------------------------

uvloop/handles/tcp.pxd:18:8: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
        bint __peername_set
        bint __sockname_set
        system.sockaddr_storage __peername
        system.sockaddr_storage __sockname

    cdef bind(self, system.sockaddr* addr, unsigned int flags=*)
                    ^
------------------------------------------------------------

uvloop/handles/tcp.pxd:20:20: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
        bint __sockname_set
        system.sockaddr_storage __peername
        system.sockaddr_storage __sockname

    cdef bind(self, system.sockaddr* addr, unsigned int flags=*)
    cdef connect(self, system.sockaddr* addr)
                       ^
------------------------------------------------------------

uvloop/handles/tcp.pxd:21:23: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
        bint _restore_signals

        list _fds_to_close

        # Attributes used to compose uv_process_options_t:
        uv.uv_process_options_t options
        ^
------------------------------------------------------------

uvloop/handles/process.pxd:14:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...

        list _fds_to_close

        # Attributes used to compose uv_process_options_t:
        uv.uv_process_options_t options
        uv.uv_stdio_container_t[3] iocnt
        ^
------------------------------------------------------------

uvloop/handles/process.pxd:15:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...

        list _fds_to_close

        # Attributes used to compose uv_process_options_t:
        uv.uv_process_options_t options
        uv.uv_stdio_container_t[3] iocnt
        ^
------------------------------------------------------------

uvloop/handles/process.pxd:15:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
cdef class UVRequest:
    cdef:
        uv.uv_req_t *request
        ^
------------------------------------------------------------

uvloop/request.pxd:3:8: 'uv' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
        bint __receiving
        int _family
        object _address

    cdef _init(self, Loop loop, unsigned int family)
    cdef _set_address(self, system.addrinfo *addr)
                            ^
------------------------------------------------------------

uvloop/handles/udp.pxd:8:28: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
        object _address

    cdef _init(self, Loop loop, unsigned int family)
    cdef _set_address(self, system.addrinfo *addr)

    cdef _connect(self, system.sockaddr* addr, size_t addr_len)
                        ^
------------------------------------------------------------

uvloop/handles/udp.pxd:10:24: 'system' is not declared

Error compiling Cython file:
------------------------------------------------------------
...
    cdef _init(self, Loop loop, unsigned int family)
    cdef _set_address(self, system.addrinfo *addr)

    cdef _connect(self, system.sockaddr* addr, size_t addr_len)

    cdef _bind(self, system.sockaddr* addr)
                     ^
------------------------------------------------------------

uvloop/handles/udp.pxd:12:21: 'system' is not declared
warning: uvloop/includes/consts.pxi:1:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:3:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:4:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:5:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:7:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:8:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:10:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:13:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:16:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:21:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:24:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/includes/consts.pxi:25:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/handles/stream.pyx:1:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/handles/process.pyx:337:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/handles/process.pyx:338:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/handles/process.pyx:339:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/handles/process.pyx:340:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See https://github.com/cython/cython/issues/4310
warning: uvloop/handles/udp.pyx:351:8: The 'IF' statement is deprecated and will be removed in a future Cython version. Consider using runtime conditions or C macros instead. See https://github.com/cython/cython/issues/4310

Error compiling Cython file:
------------------------------------------------------------
...
        self._recv_buffer_in_use = 0

        err = uv.uv_loop_init(self.uvloop)
        if err < 0:
            raise convert_error(err)
        self.uvloop.data = <void*> self
                           ^
------------------------------------------------------------

uvloop/loop.pyx:167:27: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        if self._handle is NULL:
            return

        # -> When we're at this point, something is wrong <-

        if self._handle.loop is NULL:
                             ^
------------------------------------------------------------

uvloop/handles/handle.pyx:44:29: Invalid types for 'is' (Python object, void *)

Error compiling Cython file:
------------------------------------------------------------
...

        # The handle is dealloced while open.  Let's try to close it.
        # Situations when this is possible include unhandled exceptions,
        # errors during Handle.__cinit__/__init__ etc.
        if self._inited:
            self._handle.data = NULL
                                ^
------------------------------------------------------------

uvloop/handles/handle.pyx:62:32: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        # The handle is dealloced while open.  Let's try to close it.
        # Situations when this is possible include unhandled exceptions,
        # errors during Handle.__cinit__/__init__ etc.
        if self._inited:
            self._handle.data = NULL
            uv.uv_close(self._handle, __uv_close_handle_cb)  # void; no errors
                                      ^
------------------------------------------------------------

uvloop/handles/handle.pyx:63:38: Cannot assign type 'void (uv_handle_t *) except * nogil' to 'uv_close_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            self._closed = 1

    cdef inline _finish_init(self):
        self._inited = 1
        if self._has_handle == 1:
            self._handle.data = <void*>self
                                ^
------------------------------------------------------------

uvloop/handles/handle.pyx:117:32: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
                        '{} is alive, but _loop is None'.format(name))
                if self._handle.loop is not self._loop.uvloop:
                    raise RuntimeError(
                        '{} is alive, but _handle.loop is not '
                        'initialized'.format(name))
                if self._handle.data is not <void*>self:
                                     ^
------------------------------------------------------------

uvloop/handles/handle.pyx:151:37: Invalid types for 'is_not' (Python object, void *)

Error compiling Cython file:
------------------------------------------------------------
...

        if self._handle is NULL:
            return

        if UVLOOP_DEBUG:
            if self._handle.data is NULL:
                                 ^
------------------------------------------------------------

uvloop/handles/handle.pyx:194:33: Invalid types for 'is' (Python object, void *)

Error compiling Cython file:
------------------------------------------------------------
...
                        self.__class__.__name__))

        # We want the handle wrapper (UVHandle) to stay alive until
        # the closing callback fires.
        Py_INCREF(self)
        uv.uv_close(self._handle, __uv_close_handle_cb)  # void; no errors
                                  ^
------------------------------------------------------------

uvloop/handles/handle.pyx:212:34: Cannot assign type 'void (uv_handle_t *) except * nogil' to 'uv_close_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            Py_DECREF(h)  # Was INCREFed in UVHandle._close


cdef void __close_all_handles(Loop loop):
    uv.uv_walk(loop.uvloop,
               __uv_walk_close_all_handles_cb,
               ^
------------------------------------------------------------

uvloop/handles/handle.pyx:368:15: Cannot assign type 'void (uv_handle_t *, void *) except * nogil' to 'uv_walk_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *, void *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            self._abort_init()
            raise MemoryError()

        err = uv.uv_async_init(self._loop.uvloop,
                               <uv.uv_async_t*>self._handle,
                               __uvasync_callback)
                               ^
------------------------------------------------------------

uvloop/handles/async_.pyx:15:31: Cannot assign type 'void (uv_async_t *) except * nogil' to 'uv_async_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_async_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...

        self._ensure_alive()

        if self.running == 0:
            err = uv.uv_idle_start(<uv.uv_idle_t*>self._handle,
                                   cb_idle_callback)
                                   ^
------------------------------------------------------------

uvloop/handles/idle.pyx:45:35: Cannot assign type 'void (uv_idle_t *) except * nogil' to 'uv_idle_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_idle_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...

        self._ensure_alive()

        if self.running == 0:
            err = uv.uv_check_start(<uv.uv_check_t*>self._handle,
                                    cb_check_callback)
                                    ^
------------------------------------------------------------

uvloop/handles/check.pyx:45:36: Cannot assign type 'void (uv_check_t *) except * nogil' to 'uv_check_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_check_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            # Update libuv internal time.
            uv.uv_update_time(self._loop.uvloop)  # void
            self.start_t = uv.uv_now(self._loop.uvloop)

            err = uv.uv_timer_start(<uv.uv_timer_t*>self._handle,
                                    __uvtimer_callback,
                                    ^
------------------------------------------------------------

uvloop/handles/timer.pyx:54:36: Cannot assign type 'void (uv_timer_t *) except * nogil' to 'uv_timer_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_timer_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
        self._ensure_alive()

        err = uv.uv_poll_start(
            <uv.uv_poll_t*>self._handle,
            flags,
            __on_uvpoll_event)
            ^
------------------------------------------------------------

uvloop/handles/poll.pyx:44:12: Cannot assign type 'void (uv_poll_t *, int, int) except * nogil' to 'uv_poll_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_poll_t *, int, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            return
        self.__shutting_down = 1

        self._ensure_alive()

        self._shutdown_req.data = <void*> self
                                  ^
------------------------------------------------------------

uvloop/handles/stream.pyx:257:34: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        self._ensure_alive()

        self._shutdown_req.data = <void*> self
        err = uv.uv_shutdown(&self._shutdown_req,
                             <uv.uv_stream_t*> self._handle,
                             __uv_stream_on_shutdown)
                             ^
------------------------------------------------------------

uvloop/handles/stream.pyx:260:29: Cannot assign type 'void (uv_shutdown_t *, int) except * nogil' to 'uv_shutdown_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_shutdown_t *, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
        if self.__reading:
            return

        if self.__buffered:
            err = uv.uv_read_start(<uv.uv_stream_t*>self._handle,
                                   __uv_stream_buffered_alloc,
                                   ^
------------------------------------------------------------

uvloop/handles/stream.pyx:298:35: Cannot assign type 'void (uv_handle_t *, size_t, uv_buf_t *) except * nogil' to 'uv_alloc_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *, size_t, uv_buf_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            return

        if self.__buffered:
            err = uv.uv_read_start(<uv.uv_stream_t*>self._handle,
                                   __uv_stream_buffered_alloc,
                                   __uv_stream_buffered_on_read)
                                   ^
------------------------------------------------------------

uvloop/handles/stream.pyx:299:35: Cannot assign type 'void (uv_stream_t *, Py_ssize_t, const uv_buf_t *) except * nogil' to 'uv_read_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_stream_t *, Py_ssize_t, const uv_buf_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            err = uv.uv_read_start(<uv.uv_stream_t*>self._handle,
                                   __uv_stream_buffered_alloc,
                                   __uv_stream_buffered_on_read)
        else:
            err = uv.uv_read_start(<uv.uv_stream_t*>self._handle,
                                   __loop_alloc_buffer,
                                   ^
------------------------------------------------------------

uvloop/handles/stream.pyx:302:35: Cannot assign type 'void (uv_handle_t *, size_t, uv_buf_t *) except * nogil' to 'uv_alloc_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *, size_t, uv_buf_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
                                   __uv_stream_buffered_alloc,
                                   __uv_stream_buffered_on_read)
        else:
            err = uv.uv_read_start(<uv.uv_stream_t*>self._handle,
                                   __loop_alloc_buffer,
                                   __uv_stream_on_read)
                                   ^
------------------------------------------------------------

uvloop/handles/stream.pyx:303:35: Cannot assign type 'void (uv_stream_t *, Py_ssize_t, const uv_buf_t *) except * nogil' to 'uv_read_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_stream_t *, Py_ssize_t, const uv_buf_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...

        err = uv.uv_write(&ctx.req,
                          <uv.uv_stream_t*>self._handle,
                          ctx.uv_bufs_start,
                          ctx.uv_bufs_len,
                          __uv_stream_on_write)
                          ^
------------------------------------------------------------

uvloop/handles/stream.pyx:564:26: Cannot assign type 'void (uv_write_t *, int) except * nogil' to 'uv_write_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_write_t *, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...

        self.context = Context_CopyCurrent()

        err = uv.uv_listen(<uv.uv_stream_t*> self._handle,
                           self.backlog,
                           __uv_streamserver_on_listen)
                           ^
------------------------------------------------------------

uvloop/handles/streamserver.pyx:60:27: Cannot assign type 'void (uv_stream_t *, int) except * nogil' to 'uv_connection_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_stream_t *, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
        TCPTransport transport
        uv.uv_connect_t _req_data

    def __cinit__(self, loop, transport):
        self.request = <uv.uv_req_t*>&self._req_data
        self.request.data = <void*>self
                            ^
------------------------------------------------------------

uvloop/handles/tcp.pyx:192:28: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
    cdef connect(self, system.sockaddr* addr):
        cdef int err
        err = uv.uv_tcp_connect(<uv.uv_connect_t*>self.request,
                                <uv.uv_tcp_t*>self.transport._handle,
                                addr,
                                __tcp_connect_callback)
                                ^
------------------------------------------------------------

uvloop/handles/tcp.pyx:200:32: Cannot assign type 'void (uv_connect_t *, int) except * nogil' to 'uv_connect_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_connect_t *, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
        UnixTransport transport
        uv.uv_connect_t _req_data

    def __cinit__(self, loop, transport):
        self.request = <uv.uv_req_t*> &self._req_data
        self.request.data = <void*>self
                            ^
------------------------------------------------------------

uvloop/handles/pipe.pyx:195:28: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
    cdef connect(self, char* addr):
        # uv_pipe_connect returns void
        uv.uv_pipe_connect(<uv.uv_connect_t*>self.request,
                           <uv.uv_pipe_t*>self.transport._handle,
                           addr,
                           __pipe_connect_callback)
                           ^
------------------------------------------------------------

uvloop/handles/pipe.pyx:203:27: Cannot assign type 'void (uv_connect_t *, int) except * nogil' to 'uv_connect_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_connect_t *, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
        # XXX: This is a workaround for a libuv bug:
        # - https://github.com/libuv/libuv/issues/1933
        # - https://github.com/libuv/libuv/pull/551
        if self._handle is NULL:
            return
        self._handle.data = NULL
                            ^
------------------------------------------------------------

uvloop/handles/process.pyx:21:28: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        # - https://github.com/libuv/libuv/issues/1933
        # - https://github.com/libuv/libuv/pull/551
        if self._handle is NULL:
            return
        self._handle.data = NULL
        uv.uv_close(self._handle, __uv_close_process_handle_cb)
                                  ^
------------------------------------------------------------

uvloop/handles/process.pyx:22:34: Cannot assign type 'void (uv_handle_t *) except * nogil' to 'uv_close_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            raise MemoryError()

        # Too early to call _finish_init, but still a lot of work to do.
        # Let's set handle.data to NULL, so in case something goes wrong,
        # callbacks have a chance to avoid casting *something* into UVHandle.
        self._handle.data = NULL
                            ^
------------------------------------------------------------

uvloop/handles/process.pyx:47:28: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
                       _stdin, _stdout, _stderr):

        memset(&self.options, 0, sizeof(uv.uv_process_options_t))

        self._init_env(env)
        self.options.env = self.uv_opt_env
                               ^
------------------------------------------------------------

uvloop/handles/process.pyx:240:31: Cannot convert 'char **' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        self._init_env(env)
        self.options.env = self.uv_opt_env

        self._init_args(args)
        self.options.file = self.uv_opt_file
        self.options.args = self.uv_opt_args
                                ^
------------------------------------------------------------

uvloop/handles/process.pyx:244:32: Cannot convert 'char **' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
                raise ValueError('cwd must be a str or bytes object')

            self.__cwd = cwd
            self.options.cwd = PyBytes_AsString(self.__cwd)

        self.options.exit_cb = &__uvprocess_on_exit_callback
                               ^
------------------------------------------------------------

uvloop/handles/process.pyx:260:31: Cannot convert 'void (*)(uv_process_t *, int64_t, int) except * nogil' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        self._ensure_alive()

        if self.running == 0:
            err = uv.uv_fs_event_start(
                <uv.uv_fs_event_t*>self._handle,
                __uvfsevent_callback,
                ^
------------------------------------------------------------

uvloop/handles/fsevent.pyx:47:16: Cannot assign type 'void (uv_fs_event_t *, const char *, int, int) except * nogil' to 'uv_fs_event_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_fs_event_t *, const char *, int, int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            if self.request is NULL:
                raise RuntimeError(
                    '{}.cancel: .request is NULL'.format(
                        self.__class__.__name__))

            if self.request.data is NULL:
                                 ^
------------------------------------------------------------

uvloop/request.pyx:38:33: Invalid types for 'is' (Python object, void *)

Error compiling Cython file:
------------------------------------------------------------
...
        self.hints.ai_socktype = type
        self.hints.ai_protocol = proto

        self.request = <uv.uv_req_t*> &self._req_data
        self.callback = callback
        self.request.data = <void*>self
                            ^
------------------------------------------------------------

uvloop/dns.pyx:374:28: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
        self.callback = callback
        self.request.data = <void*>self

        err = uv.uv_getaddrinfo(loop.uvloop,
                                <uv.uv_getaddrinfo_t*>self.request,
                                __on_addrinfo_resolved,
                                ^
------------------------------------------------------------

uvloop/dns.pyx:378:32: Cannot assign type 'void (uv_getaddrinfo_t *, int, addrinfo *) except * nogil' to 'uv_getaddrinfo_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_getaddrinfo_t *, int, addrinfo *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
        uv.uv_getnameinfo_t _req_data

    def __cinit__(self, Loop loop, callback):
        self.request = <uv.uv_req_t*> &self._req_data
        self.callback = callback
        self.request.data = <void*>self
                            ^
------------------------------------------------------------

uvloop/dns.pyx:396:28: Cannot convert 'void *' to Python object

Error compiling Cython file:
------------------------------------------------------------
...

    cdef query(self, system.sockaddr *addr, int flags):
        cdef int err
        err = uv.uv_getnameinfo(self.loop.uvloop,
                                <uv.uv_getnameinfo_t*>self.request,
                                __on_nameinfo_resolved,
                                ^
------------------------------------------------------------

uvloop/dns.pyx:402:32: Cannot assign type 'void (uv_getnameinfo_t *, int, const char *, const char *) except * nogil' to 'uv_getnameinfo_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_getnameinfo_t *, int, const char *, const char *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            return

        self._ensure_alive()

        err = uv.uv_udp_recv_start(<uv.uv_udp_t*>self._handle,
                                   __loop_alloc_buffer,
                                   ^
------------------------------------------------------------

uvloop/handles/udp.pyx:147:35: Cannot assign type 'void (uv_handle_t *, size_t, uv_buf_t *) except * nogil' to 'uv_alloc_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_handle_t *, size_t, uv_buf_t *) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...

        self._ensure_alive()

        err = uv.uv_udp_recv_start(<uv.uv_udp_t*>self._handle,
                                   __loop_alloc_buffer,
                                   __uv_udp_on_receive)
                                   ^
------------------------------------------------------------

uvloop/handles/udp.pyx:148:35: Cannot assign type 'void (uv_udp_t *, Py_ssize_t, const uv_buf_t *, const sockaddr *, unsigned int) except * nogil' to 'uv_udp_recv_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_udp_t *, Py_ssize_t, const uv_buf_t *, const sockaddr *, unsigned int) except * nogil'.

Error compiling Cython file:
------------------------------------------------------------
...
            err = uv.uv_udp_send(&ctx.req,
                                 <uv.uv_udp_t*>self._handle,
                                 &ctx.uv_buf,
                                 1,
                                 saddr,
                                 __uv_udp_on_send)
                                 ^
------------------------------------------------------------

uvloop/handles/udp.pyx:241:33: Cannot assign type 'void (uv_udp_send_t *, int) except * nogil' to 'uv_udp_send_cb'. Exception values are incompatible. Suggest adding 'noexcept' to type 'void (uv_udp_send_t *, int) except * nogil'.
Compiling uvloop/loop.pyx because it changed.
[1/1] Cythonizing uvloop/loop.pyx
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
    main()
  File "/usr/lib/python3.8/site-packages/pyproject_hooks/_in_process/_in_process.py", line 335, in main
    json_out['return_val'] = hook(**hook_input['kwargs'])
  File "/usr/lib/python3.8/site-packages/pyproject_hooks/_in_process/_in_process.py", line 251, in build_wheel
    return _build_backend().build_wheel(wheel_directory, config_settings,
  File "/usr/lib/python3.8/site-packages/setuptools/build_meta.py", line 416, in build_wheel
    return self._build_with_temp_dir(['bdist_wheel'], '.whl',
  File "/usr/lib/python3.8/site-packages/setuptools/build_meta.py", line 401, in _build_with_temp_dir
    self.run_setup()
  File "/usr/lib/python3.8/site-packages/setuptools/build_meta.py", line 487, in run_setup
    super(_BuildMetaLegacyBackend,
  File "/usr/lib/python3.8/site-packages/setuptools/build_meta.py", line 338, in run_setup
    exec(code, locals())
  File "<string>", line 270, in <module>
  File "/usr/lib/python3.8/site-packages/setuptools/__init__.py", line 107, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 185, in setup
    return run_commands(dist)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 201, in run_commands
    dist.run_commands()
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 969, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python3.8/site-packages/setuptools/dist.py", line 1234, in run_command
    super().run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/usr/lib/python3.8/site-packages/wheel/bdist_wheel.py", line 349, in run
    self.run_command("build")
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 318, in run_command
    self.distribution.run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/dist.py", line 1234, in run_command
    super().run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/command/build.py", line 131, in run
    self.run_command(cmd_name)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 318, in run_command
    self.distribution.run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/dist.py", line 1234, in run_command
    super().run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/usr/lib/python3.8/site-packages/setuptools/command/build_py.py", line 62, in run
    self.build_package_data()
  File "/usr/lib/python3.8/site-packages/setuptools/command/build_py.py", line 158, in build_package_data
    for target, srcfile in self._get_package_data_output_mapping():
  File "/usr/lib/python3.8/site-packages/setuptools/command/build_py.py", line 150, in _get_package_data_output_mapping
    for package, src_dir, build_dir, filenames in self.data_files:
  File "/usr/lib/python3.8/site-packages/setuptools/command/build_py.py", line 71, in __getattr__
    self.data_files = self._get_data_files()
  File "/usr/lib/python3.8/site-packages/setuptools/command/build_py.py", line 83, in _get_data_files
    self.analyze_manifest()
  File "/usr/lib/python3.8/site-packages/setuptools/command/build_py.py", line 180, in analyze_manifest
    self.run_command('egg_info')
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 318, in run_command
    self.distribution.run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/dist.py", line 1234, in run_command
    super().run_command(command)
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/usr/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 314, in run
    self.find_sources()
  File "/usr/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 322, in find_sources
    mm.run()
  File "/usr/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 551, in run
    self.add_defaults()
  File "/usr/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 589, in add_defaults
    sdist.add_defaults(self)
  File "/usr/lib/python3.8/site-packages/setuptools/command/sdist.py", line 104, in add_defaults
    super().add_defaults()
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/command/sdist.py", line 251, in add_defaults
    self._add_defaults_ext()
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/command/sdist.py", line 335, in _add_defaults_ext
    build_ext = self.get_finalized_command('build_ext')
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 305, in get_finalized_command
    cmd_obj.ensure_finalized()
  File "/usr/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 111, in ensure_finalized
    self.finalize_options()
  File "<string>", line 177, in finalize_options
  File "/usr/lib64/python3.8/site-packages/Cython/Build/Dependencies.py", line 1134, in cythonize
    cythonize_one(*args)
  File "/usr/lib64/python3.8/site-packages/Cython/Build/Dependencies.py", line 1301, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: uvloop/loop.pyx

ERROR Backend subprocess exited when trying to invoke build_wheel

RFE: please provide cython 3.x support #558

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RFE: please provide `cython` 3.x support #558