Description
setuptools version
75.1.0
Python version
3.13
OS
Windows
Additional environment information
No response
Description
When building a native extension against the free-threading build, the Py_GIL_DISABLED macro is not defined, which on Windows causes the built extension to crash on import due to linking to python313.dll instead of python313t.dll.
python/cpython#111650 seems to imply that it should be setuptools' job to handle this.
Expected behavior
Py_GIL_DISABLED macro is defined when building if sysconfig.get_config_var("Py_GIL_DISABLED").
How to Reproduce
py -3.13t -m pip install git+https://github.com/giampaolo/psutil.git@b1e52fcfe4bd0a3d09334fddd6ffd23288f77a79
py -3.13t -c "import psutil"
### Output
segfault in python313.dll