https://github.com/python/cpython/commit/28d3b9bc56df6c2da3e898a0b7a066df5761b04d commit: 28d3b9bc56df6c2da3e898a0b7a066df5761b04d branch: 3.14 author: Miss Islington (bot) <[email protected]> committer: gpshead <[email protected]> date: 2026-03-28T05:30:06Z summary:
[3.14] gh-146004: propagate all -X options to multiprocessing child processes (GH-146005) (#146552) gh-146004: propagate all -X options to multiprocessing child processes (GH-146005) Propagate all -X command line options to multiprocessing spawned child Python processes. (cherry picked from commit 1efe441de7c448852b9ba51fb0db4d355a7157a8) Co-authored-by: Gregory P. Smith <[email protected]> files: A Misc/NEWS.d/next/Library/2026-03-16-00-00-00.gh-issue-146004.xOptProp.rst M Lib/subprocess.py M Lib/test/test_support.py diff --git a/Lib/subprocess.py b/Lib/subprocess.py index 578d7b95d05d7b..52b7b7117703d7 100644 --- a/Lib/subprocess.py +++ b/Lib/subprocess.py @@ -351,15 +351,16 @@ def _args_from_interpreter_flags(): # -X options if dev_mode: args.extend(('-X', 'dev')) - for opt in ('faulthandler', 'tracemalloc', 'importtime', - 'frozen_modules', 'showrefcount', 'utf8', 'gil'): - if opt in xoptions: - value = xoptions[opt] - if value is True: - arg = opt - else: - arg = '%s=%s' % (opt, value) - args.extend(('-X', arg)) + for opt in sorted(xoptions): + if opt == 'dev': + # handled above via sys.flags.dev_mode + continue + value = xoptions[opt] + if value is True: + arg = opt + else: + arg = '%s=%s' % (opt, value) + args.extend(('-X', arg)) return args diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py index 79f0e2eb29ff4c..97db7405a8bbef 100644 --- a/Lib/test/test_support.py +++ b/Lib/test/test_support.py @@ -559,12 +559,19 @@ def test_args_from_interpreter_flags(self): # -X options ['-X', 'dev'], ['-Wignore', '-X', 'dev'], + ['-X', 'cpu_count=4'], + ['-X', 'disable-remote-debug'], ['-X', 'faulthandler'], ['-X', 'importtime'], ['-X', 'importtime=2'], + ['-X', 'int_max_str_digits=1000'], + ['-X', 'lazy_imports=all'], + ['-X', 'no_debug_ranges'], + ['-X', 'pycache_prefix=/tmp/pycache'], ['-X', 'showrefcount'], ['-X', 'tracemalloc'], ['-X', 'tracemalloc=3'], + ['-X', 'warn_default_encoding'], ): with self.subTest(opts=opts): self.check_options(opts, 'args_from_interpreter_flags') diff --git a/Misc/NEWS.d/next/Library/2026-03-16-00-00-00.gh-issue-146004.xOptProp.rst b/Misc/NEWS.d/next/Library/2026-03-16-00-00-00.gh-issue-146004.xOptProp.rst new file mode 100644 index 00000000000000..234e6102c6a252 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2026-03-16-00-00-00.gh-issue-146004.xOptProp.rst @@ -0,0 +1,9 @@ +All :option:`-X` options from the Python command line are now propagated to +child processes spawned by :mod:`multiprocessing`, not just a hard-coded +subset. This makes the behavior consistent between default "spawn" and +"forkserver" start methods and the old "fork" start method. The options +that were previously not propagated are: ``context_aware_warnings``, +``cpu_count``, ``disable-remote-debug``, ``int_max_str_digits``, +``lazy_imports``, ``no_debug_ranges``, ``pathconfig_warnings``, ``perf``, +``perf_jit``, ``presite``, ``pycache_prefix``, ``thread_inherit_context``, +and ``warn_default_encoding``. _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
