test_embed.test_init_pyvenv_cfg fails

[WolframAlph]

Bug report

Bug description:

Trying to build Python from main branch and running tests on MacOS 15.2 fails on test_embed.test_init_pyvenv_cfg.

./configure && make -j && ./python.exe -m test test_embed

FAIL: test_init_pyvenv_cfg (test.test_embed.InitConfigTests.test_init_pyvenv_cfg)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/yyanchii/Desktop/cpython/Lib/test/test_embed.py", line 1671, in test_init_pyvenv_cfg
    self.check_all_configs("test_init_compat_config", config,
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                           api=API_COMPAT, env=env,
                           ^^^^^^^^^^^^^^^^^^^^^^^^
                           ignore_stderr=True, cwd=tmpdir)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/yyanchii/Desktop/cpython/Lib/test/test_embed.py", line 939, in check_all_configs
    self.check_config(configs, expected_config)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/yyanchii/Desktop/cpython/Lib/test/test_embed.py", line 865, in check_config
    self.assertEqual(config, expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
AssertionError: {'argv': [''], 'base_exec_prefix': '/usr/lo[2028 chars]None} != {'_config_init': 1, 'isolated': False, 'use[2128 chars]alse}
  {'_config_init': 1,
   '_init_main': True,
   '_install_importlib': True,
   'argv': [''],
-  'base_exec_prefix': '/usr/local',
+  'base_exec_prefix': '/var/folders/z9/tt4sxxm159zbh6xlm2mhrg4r0000gp/T/tmp_o9bmpp_',
   'base_executable': '/var/folders/z9/tt4sxxm159zbh6xlm2mhrg4r0000gp/T/tmp_o9bmpp_/_testembed',
   'base_prefix': '/usr/local',
   'buffered_stdio': True,
   'bytes_warning': 0,
   'check_hash_pycs_mode': 'default',
   'code_debug_ranges': True,
   'configure_c_stdio': False,
   'cpu_count': -1,
   'dev_mode': False,
   'dump_refs': False,
   'dump_refs_file': None,
   'exec_prefix': '/private/var/folders/z9/tt4sxxm159zbh6xlm2mhrg4r0000gp/T/tmp_7n79vly',
   'executable': '/private/var/folders/z9/tt4sxxm159zbh6xlm2mhrg4r0000gp/T/tmp_7n79vly/_testembed',
   'faulthandler': False,
   'hash_seed': 0,
   'home': None,
   'import_time': False,
   'inspect': False,
   'install_signal_handlers': True,
   'int_max_str_digits': 4300,
   'interactive': False,
   'isolated': False,
   'malloc_stats': False,
   'module_search_paths': ['/usr/local/lib/python314.zip',
                           '/Users/yyanchii/Desktop/cpython/Lib',
                           '/Users/yyanchii/Desktop/cpython/build/lib.macosx-15.2-arm64-3.14',
                           '/usr/local/lib/python314.zip',
                           '/usr/local/lib/python3.14',
-                          '/usr/local/lib/python3.14/lib-dynload'],
+                          '/var/folders/z9/tt4sxxm159zbh6xlm2mhrg4r0000gp/T/tmp_o9bmpp_/lib/python3.14/lib-dynload'],
   'module_search_paths_set': True,
   'optimization_level': 0,
   'orig_argv': [],
   'parse_argv': False,
   'parser_debug': False,
   'pathconfig_warnings': True,
   'perf_profiling': 0,
   'platlibdir': 'lib',
   'prefix': '/private/var/folders/z9/tt4sxxm159zbh6xlm2mhrg4r0000gp/T/tmp_7n79vly',
   'program_name': './_testembed',
   'pycache_prefix': None,
   'pythonpath_env': '/usr/local/lib/python314.zip:/Users/yyanchii/Desktop/cpython/Lib:/Users/yyanchii/Desktop/cpython/build/lib.macosx-15.2-arm64-3.14',
   'quiet': False,
   'run_command': None,
   'run_filename': None,
   'run_module': None,
   'run_presite': None,
   'safe_path': False,
   'show_ref_count': False,
   'site_import': True,
   'skip_source_first_line': False,
   'sys_path_0': None,
   'tracemalloc': 0,
   'use_environment': True,
   'use_frozen_modules': False,
   'use_hash_seed': False,
   'use_system_logger': False,
   'user_site_directory': True,
   'verbose': 0,
   'warn_default_encoding': False,
   'warnoptions': [],
   'write_bytecode': True,
   'xoptions': {}}

----------------------------------------------------------------------
Ran 82 tests in 5.051s

FAILED (failures=1, skipped=3)
test test_embed failed
test_embed failed (1 failure)

== Tests result: FAILURE ==

1 test failed:
    test_embed

Total duration: 5.1 sec
Total tests: run=82 failures=1 skipped=3
Total test files: run=1/1 failed=1
Result: FAILURE

After bisecting found out 34e840f9ddd commit to be the reason. cc @FFY00

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS