uvloop fails to build with Python 3.13-rc1

[fafanoulele]

• uvloop version: 0.20.0
• Python version: 3.13-rc1
• Platform: Linux (x86)
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: N/A
• Does uvloop behave differently from vanilla asyncio? How?: N/A

I failed to install uvloop on Python 3.13-rc1 using this command docker run --name python --rm -i -t python:3.13-rc pip install uvloop. It ends up with those errors:

      CC       src/unix/libuv_la-thread.lo
        CC       src/unix/libuv_la-tty.lo
        CC       src/unix/libuv_la-udp.lo
        CC       src/unix/libuv_la-linux.lo
        CC       src/unix/libuv_la-procfs-exepath.lo
        CC       src/unix/libuv_la-proctitle.lo
        CC       src/unix/libuv_la-random-getrandom.lo
        CC       src/unix/libuv_la-random-sysctl-linux.lo
        CCLD     libuv.la
      building 'uvloop.loop' extension
      creating build/temp.linux-x86_64-cpython-313
      creating build/temp.linux-x86_64-cpython-313/uvloop
      gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall -fPIC -I/usr/local/include/python3.13 -I/tmp/pip-install-r84qnrzv/uvloop_79e898f88d434926a381685fb361c382/vendor/libuv/include -c uvloop/loop.c -o build/temp.linux-x86_64-cpython-313/uvloop/loop.o -O2
      uvloop/loop.c:860:1: warning: ‘Py_UNICODE’ is deprecated [-Wdeprecated-declarations]
        860 | static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u) {
            | ^~~~~~
      uvloop/loop.c: In function ‘__Pyx_Py_UNICODE_strlen’:
      uvloop/loop.c:861:5: warning: ‘Py_UNICODE’ is deprecated [-Wdeprecated-declarations]
        861 |     const Py_UNICODE *u_end = u;
            |     ^~~~~
      uvloop/loop.c: In function ‘__Pyx_init_assertions_enabled’:
      uvloop/loop.c:4446:39: warning: implicit declaration of function ‘_PyInterpreterState_GetConfig’; did you mean ‘PyInterpreterState_GetID’? [-Wimplicit-function-declaration]
       4446 |     __pyx_assertions_enabled_flag = ! _PyInterpreterState_GetConfig(__Pyx_PyThreadState_Current->interp)->optimization_level;
            |                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            |                                       PyInterpreterState_GetID
      uvloop/loop.c:4446:105: error: invalid type argument of ‘->’ (have ‘int’)
       4446 |     __pyx_assertions_enabled_flag = ! _PyInterpreterState_GetConfig(__Pyx_PyThreadState_Current->interp)->optimization_level;
            |                                                                                                         ^~
      uvloop/loop.c: In function ‘__pyx_pymod_exec_loop’:
      uvloop/loop.c:4637:38: warning: implicit declaration of function ‘_PyDict_SetItem_KnownHash’; did you mean ‘_PyDict_GetItem_KnownHash’? [-Wimplicit-function-declaration]
       4637 |     (likely(PyDict_CheckExact(ns)) ? _PyDict_SetItem_KnownHash(ns, name, value, ((PyASCIIObject *) name)->hash) : PyObject_SetItem(ns, name, value))
            |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~
      uvloop/loop.c:170726:7: note: in expansion of macro ‘__Pyx_SetNameInClass’
      170726 |   if (__Pyx_SetNameInClass(__pyx_t_2, __pyx_n_s_init, __pyx_t_6) < 0) __PYX_ERR(0, 3276, __pyx_L1_error)
             |       ^~~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_set_iter_next’:
      uvloop/loop.c:172859:19: warning: implicit declaration of function ‘_PySet_NextEntry’ [-Wimplicit-function-declaration]
      172859 |         int ret = _PySet_NextEntry(iter_obj, ppos, value, &hash);
             |                   ^~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyUnicode_Join’:
      uvloop/loop.c:174209:13: warning: implicit declaration of function ‘_PyUnicode_FastCopyCharacters’; did you mean ‘PyUnicode_CopyCharacters’? [-Wimplicit-function-declaration]
      174209 |             _PyUnicode_FastCopyCharacters(result_uval, char_pos, uval, 0, ulength);
             |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             |             PyUnicode_CopyCharacters
      uvloop/loop.c: In function ‘__Pyx_PyGen_Send’:
      uvloop/loop.c:174694:13: warning: implicit declaration of function ‘_PyGen_SetStopIterationValue’; did you mean ‘__Pyx_PyGen__FetchStopIterationValue’? [-Wimplicit-function-declaration]
      174694 |             _PyGen_SetStopIterationValue(result);
             |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
             |             __Pyx_PyGen__FetchStopIterationValue
      uvloop/loop.c: In function ‘__Pyx_Coroutine_AwaitableIterError’:
      uvloop/loop.c:175664:5: warning: implicit declaration of function ‘_PyErr_FormatFromCause’ [-Wimplicit-function-declaration]
      175664 |     _PyErr_FormatFromCause(
             |     ^~~~~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyInt_As_int’:
      uvloop/loop.c:177569:27: error: too few arguments to function ‘_PyLong_AsByteArray’
      177569 |                 int ret = _PyLong_AsByteArray((PyLongObject *)v,
             |                           ^~~~~~~~~~~~~~~~~~~
      In file included from /usr/local/include/python3.13/longobject.h:107,
                       from /usr/local/include/python3.13/Python.h:77,
                       from uvloop/loop.c:22:
      /usr/local/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyInt_As_uint64_t’:
      uvloop/loop.c:177765:27: error: too few arguments to function ‘_PyLong_AsByteArray’
      177765 |                 int ret = _PyLong_AsByteArray((PyLongObject *)v,
             |                           ^~~~~~~~~~~~~~~~~~~
      /usr/local/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyInt_As_long’:
      uvloop/loop.c:177999:27: error: too few arguments to function ‘_PyLong_AsByteArray’
      177999 |                 int ret = _PyLong_AsByteArray((PyLongObject *)v,
             |                           ^~~~~~~~~~~~~~~~~~~
      /usr/local/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyInt_As_unsigned_long’:
      uvloop/loop.c:178271:27: error: too few arguments to function ‘_PyLong_AsByteArray’
      178271 |                 int ret = _PyLong_AsByteArray((PyLongObject *)v,
             |                           ^~~~~~~~~~~~~~~~~~~
      /usr/local/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyInt_As_unsigned_int’:
      uvloop/loop.c:178467:27: error: too few arguments to function ‘_PyLong_AsByteArray’
      178467 |                 int ret = _PyLong_AsByteArray((PyLongObject *)v,
             |                           ^~~~~~~~~~~~~~~~~~~
      /usr/local/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~
      uvloop/loop.c: In function ‘__Pyx_PyInt_As_size_t’:
      uvloop/loop.c:178739:27: error: too few arguments to function ‘_PyLong_AsByteArray’
      178739 |                 int ret = _PyLong_AsByteArray((PyLongObject *)v,
             |                           ^~~~~~~~~~~~~~~~~~~
      /usr/local/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~
      error: command '/usr/bin/gcc' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for uvloop
Failed to build uvloop
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (uvloop)

[fantix]

https://github.com/MagicStack/uvloop/pull/587 will fix this

[fafanoulele]

Great! Thanks @fantix for the update!

[triatic]

I came across this using the Fedora 41 Beta, which ships with Python 3.13. Hopefully 0.21.0 will arrive on PyPI soon.

[pythonmobile]

waiting for this to be merged and live.

[pythonmobile]

can confirm that I could compile and install uvloop on 3.13.0 on ubuntu 22.04lts.

Processing /tmp/uvloop
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: uvloop
  Building wheel for uvloop (pyproject.toml) ... done
  Created wheel for uvloop: filename=uvloop-0.21.0b1-cp313-cp313-linux_x86_64.whl size=4619984 sha256=19fe6d03992624850ed0a41918596dfe97a7ba5413666d345808c5493967818c
  Stored in directory: /tmp/pip-ephem-wheel-cache-bu70wa59/wheels/0e/58/6c/936f66fee135226024fdde3587af7da3d5787645f9ad5f088e
Successfully built uvloop
Installing collected packages: uvloop
Successfully installed uvloop-0.21.0b1```

[MarekSzadkowski]

OK, I have this error too. Also on Ubuntu, but 24.04. Any clues?

[rsommer]

Current master builds fine against standard 3.13.0 but failes when python is build with free-threaded/nogil mode with several errors like this:

uvloop/loop.c: In function ‘__Pyx_CyFunction_CallAsMethod’:
uvloop/loop.c:207937:6: error: unknown type name ‘__pyx_vectorcallfunc’; did you mean ‘vectorcallfunc’?
207937 |      __pyx_vectorcallfunc vc = __Pyx_CyFunction_func_vectorcall(cyfunc);

Tested against free-threaded python 3.13.0 installed via asdf using asdf install python 3.13.0t.

[paullam328]

3.13.0 still have this bug yeah, especially when installing asyncio. Solution: I dropped back to 3.12 for Docker img, and it worked.

Would be nice if the fix is installed for 3.13 though

[theoturner]

Same error on MacOS 15.0.1 with Python 3.13

[MarekSzadkowski]

I can admit 0.21.0b1 compiles successfully on Ubuntu 24.04 now. I went with my fork of CPython, installed all dependencies and it works. However: test_cython_coro_is_coroutine (test_cython.TestCythonIntegration.test_cython_coro_is_coroutine) ... python: Objects/codeobject.c:947: PyCode_Addr2Line: Assertion `addrq >= 0 && addrq < _PyCode_NBYTES(co)' failed. Aborted (core dumped) make: *** [Makefile:50: test] Error 134

I also tried to compile with forked Python (which is 3.14 pre-alpha, just 4 days old) and it failed.

[jameshilliard]

@fantix Think you could spin a new release with python 3.13 support?

[fantix]

Yup, on it. I'll promote the current beta into a release.

[jakirkham]

Think this can now be closed with 0.21.0 out

[fantix]

Yup, please feel free to reopen if 0.21.0 doesn't work.