gh-117649: Raise ImportError for unsupported modules in free-threaded build (#117651)

The free-threaded build does not currently support the combination of
single-phase init modules and non-isolated subinterpreters. Ensure that
`check_multi_interp_extensions` is always `True` for subinterpreters in
the free-threaded build so that importing these modules raises an
`ImportError`.

1 files changed, 5 insertions, 8 deletions

diff --git a/Lib/test/test_interpreters/test_api.py b/Lib/test/test_interpreters/test_api.py
index abf66a7..769bb7b 100644
--- a/Lib/test/test_interpreters/test_api.py
+++ b/Lib/test/test_interpreters/test_api.py
@@ -10,6 +10,7 @@ from test import support
 from test.support import import_helper
 # Raise SkipTest if subinterpreters not supported.
 _interpreters = import_helper.import_module('_xxsubinterpreters')
+from test.support import Py_GIL_DISABLED
 from test.support import interpreters
 from test.support.interpreters import (
     InterpreterError, InterpreterNotFoundError, ExecutionFailed,
@@ -1162,7 +1163,7 @@ class LowLevelTests(TestBase):
                 allow_exec=True,
                 allow_threads=True,
                 allow_daemon_threads=True,
-                check_multi_interp_extensions=False,
+                check_multi_interp_extensions=bool(Py_GIL_DISABLED),
                 gil='shared',
             ),
             'empty': types.SimpleNamespace(
@@ -1361,6 +1362,7 @@ class LowLevelTests(TestBase):
         with self.subTest('custom'):
             orig = _interpreters.new_config('empty')
             orig.use_main_obmalloc = True
+            orig.check_multi_interp_extensions = bool(Py_GIL_DISABLED)
             orig.gil = 'shared'
             interpid = _interpreters.create(orig)
             config = _interpreters.get_config(interpid)
@@ -1410,13 +1412,8 @@ class LowLevelTests(TestBase):
         with self.subTest('main'):
             expected = _interpreters.new_config('legacy')
             expected.gil = 'own'
-            interpid, *_ = _interpreters.get_main()
-            config = _interpreters.get_config(interpid)
-            self.assert_ns_equal(config, expected)
-
-        with self.subTest('main'):
-            expected = _interpreters.new_config('legacy')
-            expected.gil = 'own'
+            if Py_GIL_DISABLED:
+                expected.check_multi_interp_extensions = False
             interpid, *_ = _interpreters.get_main()
             config = _interpreters.get_config(interpid)
             self.assert_ns_equal(config, expected)