Linkage conflict when buildin with a C++ compiler and Python 3.14 free-threaded #138762
Description
Encountered when attempting to build greenlet:
Building wheel for greenlet (pyproject.toml): started
Building wheel for greenlet (pyproject.toml): finished with status 'error'
error: subprocess-exited-with-error
× Building wheel for greenlet (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [130 lines of output]
running bdist_wheel
running build
running build_py
creating build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/__init__.py -> build/lib.linux-x86_64-cpython-314t/greenlet
creating build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_weakref.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_version.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_tracing.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_throw.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_stack_saved.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_leaks.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_greenlet_trash.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_greenlet.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_generator_nested.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_generator.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_gc.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_extension_interface.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_cpp.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/test_contextvars.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/leakcheck.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_switch_two_greenlets.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_switch_three_greenlets2.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_switch_three_greenlets.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_slp_switch.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_initialstub_already_started.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_cpp_exception.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/fail_clearing_run_switches.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/__init__.py -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
creating build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/__init__.py -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
running egg_info
writing src/greenlet.egg-info/PKG-INFO
writing dependency_links to src/greenlet.egg-info/dependency_links.txt
writing requirements to src/greenlet.egg-info/requires.txt
writing top-level names to src/greenlet.egg-info/top_level.txt
reading manifest file 'src/greenlet.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files found matching 'benchmarks/*.json'
no previously-included directories found matching 'docs/_build'
warning: no files found matching '*.py' under directory 'appveyor'
warning: no previously-included files matching '*.pyc' found anywhere in distribution
warning: no previously-included files matching '*.pyd' found anywhere in distribution
warning: no previously-included files matching '*.so' found anywhere in distribution
warning: no previously-included files matching '.coverage' found anywhere in distribution
adding license file 'LICENSE'
adding license file 'LICENSE.PSF'
writing manifest file 'src/greenlet.egg-info/SOURCES.txt'
copying src/greenlet/CObjects.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/PyGreenlet.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/PyGreenlet.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/PyGreenletUnswitchable.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/PyModule.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TBrokenGreenlet.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TExceptionState.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TGreenlet.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TGreenlet.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TGreenletGlobals.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TMainGreenlet.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TPythonState.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TStackState.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TThreadState.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TThreadStateCreator.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TThreadStateDestroy.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/TUserGreenlet.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet.h -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_allocator.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_compiler_compat.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_cpython_compat.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_exceptions.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_internal.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_msvc_compat.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_refs.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_slp_switch.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/greenlet_thread_support.hpp -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/slp_platformselect.h -> build/lib.linux-x86_64-cpython-314t/greenlet
copying src/greenlet/tests/_test_extension.c -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/tests/_test_extension_cpp.cpp -> build/lib.linux-x86_64-cpython-314t/greenlet/tests
copying src/greenlet/platform/setup_switch_x64_masm.cmd -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_aarch64_gcc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_alpha_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_amd64_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_arm32_gcc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_arm32_ios.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_arm64_masm.asm -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_arm64_masm.obj -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_arm64_msvc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_csky_gcc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_loongarch64_linux.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_m68k_gcc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_mips_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_ppc64_aix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_ppc64_linux.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_ppc_aix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_ppc_linux.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_ppc_macosx.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_ppc_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_riscv_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_s390_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_sh_gcc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_sparc_sun_gcc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_x32_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_x64_masm.asm -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_x64_masm.obj -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_x64_msvc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_x86_msvc.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
copying src/greenlet/platform/switch_x86_unix.h -> build/lib.linux-x86_64-cpython-314t/greenlet/platform
running build_ext
building 'greenlet._greenlet' extension
creating build/temp.linux-x86_64-cpython-314t/src/greenlet
g++ -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -fexceptions -fcf-protection -fexceptions -fcf-protection -fexceptions -fcf-protection -O3 -fPIC -I/home/cc/venv/include -I/usr/include/python3.14t -c src/greenlet/greenlet.cpp -o build/temp.linux-x86_64-cpython-314t/src/greenlet/greenlet.o
In file included from /usr/include/python3.14t/internal/pycore_pythread.h:11,
from /usr/include/python3.14t/internal/pycore_condvar.h:8,
from /usr/include/python3.14t/internal/pycore_gil.h:11,
from /usr/include/python3.14t/internal/pycore_interp_structs.h:261,
from /usr/include/python3.14t/internal/pycore_gc.h:11,
from /usr/include/python3.14t/internal/pycore_object.h:12,
from /usr/include/python3.14t/internal/pycore_stackref.h:11,
from /usr/include/python3.14t/internal/pycore_interpframe.h:10,
from src/greenlet/TGreenlet.hpp:35,
from src/greenlet/greenlet_internal.hpp:18,
from src/greenlet/greenlet.cpp:19:
/usr/include/python3.14t/dynamic_annotations.h:472:3: error: template with C linkage
472 | template <class T>
| ^~~~~~~~
/usr/include/python3.14t/internal/pycore_pythread.h:4:1: note: ‘extern "C"’ linkage started here
4 | extern "C" {
| ^~~~~~~~~~
error: command '/opt/gcc-latest/bin/g++' 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 greenlet