Build error from Git on 3.14 Linux no-GIL

[clin1234]

  x86_64-linux-gnu-gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O2 -Wall -g -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O2 -Wall -g -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/workspaces/venv/include -I/usr/include/python3.14t -Ibuild/temp.linux-x86_64-cpython-314t/include -c build/temp.linux-x86_64-cpython-314t/_sodium.c -o build/temp.linux-x86_64-cpython-314t/build/temp.linux-x86_64-cpython-314t/_sodium.o
  In file included from build/temp.linux-x86_64-cpython-314t/_sodium.c:57:
  /usr/include/python3.14t/Python.h:51:4: error: #error "The limited API is not currently supported in the free-threaded build"
     51 | #  error "The limited API is not currently supported in the free-threaded build"
        |    ^~~~~
  In file included from /usr/include/python3.14t/Python.h:68,
                   from build/temp.linux-x86_64-cpython-314t/_sodium.c:57:
  /usr/include/python3.14t/object.h:146:5: error: unknown type name ‘PyMutex’
    146 |     PyMutex ob_mutex;           // per-object lock
        |     ^~~~~~~
  /usr/include/python3.14t/object.h: In function ‘Py_SET_SIZE’:
  /usr/include/python3.14t/object.h:293:5: warning: implicit declaration of function ‘_Py_atomic_store_ssize_relaxed’ [-Wimplicit-function-declaration]
    293 |     _Py_atomic_store_ssize_relaxed(&ob->ob_size, size);
        |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from /usr/include/python3.14t/Python.h:69,
                   from build/temp.linux-x86_64-cpython-314t/_sodium.c:57:
  /usr/include/python3.14t/refcount.h: In function ‘Py_REFCNT’:
  /usr/include/python3.14t/refcount.h:84:22: warning: implicit declaration of function ‘_Py_atomic_load_uint32_relaxed’ [-Wimplicit-function-declaration]
     84 |     uint32_t local = _Py_atomic_load_uint32_relaxed(&ob->ob_ref_local);
        |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/python3.14t/refcount.h:88:25: warning: implicit declaration of function ‘_Py_atomic_load_ssize_relaxed’ [-Wimplicit-function-declaration]
     88 |     Py_ssize_t shared = _Py_atomic_load_ssize_relaxed(&ob->ob_ref_shared);
        |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/python3.14t/refcount.h: In function ‘_Py_IsImmortal’:
  /usr/include/python3.14t/refcount.h:101:63: warning: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Wsign-compare]
    101 |     return (_Py_atomic_load_uint32_relaxed(&op->ob_ref_local) ==
        |                                                               ^~
  /usr/include/python3.14t/refcount.h: In function ‘Py_SET_REFCNT’:
  /usr/include/python3.14t/refcount.h:132:9: warning: implicit declaration of function ‘_Py_IsOwnedByCurrentThread’ [-Wimplicit-function-declaration]
    132 |     if (_Py_IsOwnedByCurrentThread(ob)) {
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/python3.14t/refcount.h: In function ‘Py_INCREF’:
  /usr/include/python3.14t/refcount.h:234:9: warning: implicit declaration of function ‘_Py_atomic_store_uint32_relaxed’ [-Wimplicit-function-declaration]
    234 |         _Py_atomic_store_uint32_relaxed(&op->ob_ref_local, new_local);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/python3.14t/refcount.h:237:9: warning: implicit declaration of function ‘_Py_atomic_add_ssize’; did you mean ‘__atomic_add_fetch’? [-Wimplicit-function-declaration]
    237 |         _Py_atomic_add_ssize(&op->ob_ref_shared, (1 << _Py_REF_SHARED_SHIFT));
        |         ^~~~~~~~~~~~~~~~~~~~
        |         __atomic_add_fetch
  /usr/include/python3.14t/refcount.h: In function ‘Py_DECREF’:
  /usr/include/python3.14t/refcount.h:330:13: warning: implicit declaration of function ‘_Py_MergeZeroLocalRefcount’ [-Wimplicit-function-declaration]
    330 |             _Py_MergeZeroLocalRefcount(op);
        |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/python3.14t/refcount.h:334:9: warning: implicit declaration of function ‘_Py_DecRefShared’; did you mean ‘_Py_DecRef’? [-Wimplicit-function-declaration]
    334 |         _Py_DecRefShared(op);
        |         ^~~~~~~~~~~~~~~~
        |         _Py_DecRef
  error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1
  error: subprocess-exited-with-error
  
  × Building wheel for PyNaCl (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  full command: /workspaces/venv/bin/python3.14t /workspaces/venv/lib/python3.14t/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py build_wheel /tmp/tmps_rv39l9
  cwd: /tmp/pip-req-build-pm8k_1qq
  Building wheel for PyNaCl (pyproject.toml) ... error
  ERROR: Failed building wheel for PyNaCl
Failed to build PyNaCl
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (PyNaCl)

[reaperhulk]

python-cffi/cffi#40 is needed before we can look at this for pynacl. We'll keep an eye on this but there's no action we can take for the near future here.

[nitzmahone]

Did some minor surgery on CFFI tonight (force-disabling limited API support everywhere) - PyNACL main succesfully building and passing its tests under 3.13t (with and without PYTHON_GIL=0):

(tmp-8621ac4e4403c11) mdavis@mdavis-p1:~/projects/pynacl$ pip install . --no-build-isolation && PYTHON_GIL=0 pytest --capture=no --strict-markers
Processing /home/mdavis/projects/pynacl
  Preparing metadata (pyproject.toml) ... done
Requirement already satisfied: cffi>=1.18.0.dev0 in /home/mdavis/.virtualenvs/tmp-8621ac4e4403c11/lib64/python3.13t/site-packages (from PyNaCl==1.6.0.dev1) (1.18.0.dev0)
Requirement already satisfied: pycparser in /home/mdavis/.virtualenvs/tmp-8621ac4e4403c11/lib/python3.13t/site-packages (from cffi>=1.18.0.dev0->PyNaCl==1.6.0.dev1) (2.22)
Building wheels for collected packages: PyNaCl
  Building wheel for PyNaCl (pyproject.toml) ... done
  Created wheel for PyNaCl: filename=PyNaCl-1.6.0.dev1-cp313-cp313t-linux_x86_64.whl size=311422 sha256=41db158dc1df69dfcf78203ebfaafb6a7ffc64950b58474a2751c40b19014b6d
  Stored in directory: /tmp/pip-ephem-wheel-cache-z9de5srw/wheels/ac/91/e0/9fe918b5c7eb37a64443257841601f00708781ee58ce455eeb
Successfully built PyNaCl
Installing collected packages: PyNaCl
  Attempting uninstall: PyNaCl
    Found existing installation: PyNaCl 1.6.0.dev1
    Uninstalling PyNaCl-1.6.0.dev1:
      Successfully uninstalled PyNaCl-1.6.0.dev1
Successfully installed PyNaCl-1.6.0.dev1
========================================================================= test session starts ==========================================================================
platform linux -- Python 3.13.0rc1, pytest-8.3.2, pluggy-1.5.0
rootdir: /home/mdavis/projects/pynacl
configfile: pyproject.toml
plugins: hypothesis-6.111.2
collected 4661 items                                                                                                                                                   

tests/test_aead.py ..........................................................................
(...)
tests/test_utils.py .....

================================================================== 4651 passed, 10 skipped in 13.71s ===================================================================
(tmp-8621ac4e4403c11) mdavis@mdavis-p1:~/projects/pynacl$ 

This means nearly nothing, of course- actually doing concurrent anything right now is likely to implode the universe, kick your dog, etc, but at least it builds and runs without segfaulting... 😆

We'll need to figure out a more dynamic approach to detection/control of the limited API knobs on free-threaded builds beyond the "disabled with prejudice" used for this test before there's anything commit-worthy, but anyway, progress!