Add test for free-threaded build

tests/run_tests.py

@@ -1297,6 +1297,10 @@ def test_signed(self):
         check_call(['delvewheel', 'repair', '--add-path', 'simpleext/x64', 'simpleext/simpleext-0.0.1-0sign-cp312-cp312-win_amd64.whl'])
         self.assertTrue(import_simpleext_successful('0sign'))
 
+    def test_free_threaded(self):
+        """Free-threaded wheel can be repaired"""
+        check_call(['delvewheel', 'repair', '--add-path', 'simpleext/x64', 'simpleext/simpleext-0.0.1-cp313-cp313t-win_amd64.whl'])
+
 
 class NeededTestCase(unittest.TestCase):
     """Tests for delvewheel needed"""

tests/simpleext/build/setup.py

@@ -5,6 +5,7 @@
 py_limited_api = False  # set to True and add --py-limited-api=cp3__ to command line to build with Python limited API
 dependent_load_flags = '0'  # change to set a different /DEPENDENTLOADFLAG linker option
 checksum = False  # change to True to set the PE checksum
+free_threaded = False  # change to True to support free-threading
 
 if sys.maxsize > 2**32:
     library_dirs = ['simpledll/x64/Release']
@@ -21,6 +22,8 @@
     python_requires = f">={py_major}.{py_minor}"
 else:
     python_requires = f"=={py_major}.{py_minor}.*"
+if free_threaded:
+    define_macros.append(('Py_GIL_DISABLED', '1'))
 extra_link_args = [f'/DEPENDENTLOADFLAG:{dependent_load_flags}']
 if checksum:
     extra_link_args.append('/RELEASE')

tests/simpleext/build/simpleext.c

@@ -30,5 +30,10 @@ static struct PyModuleDef simpleextmodule = {
 
 PyMODINIT_FUNC SIMPLEEXT_INIT(void)
 {
-    return PyModule_Create(&simpleextmodule);
+    PyObject *m = PyModule_Create(&simpleextmodule);
+    if (!m) return NULL;
+#ifdef Py_GIL_DISABLED
+    PyUnstable_Module_SetGIL(m, Py_MOD_GIL_NOT_USED);
+#endif
+    return m;
 }