[3.13] gh-146004: propagate all -X options to multiprocessing child processes (GH-146005) - #155938
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…hild processes (pythonGH-146005) Propagate all -X command line options to multiprocessing spawned child Python processes. (cherry picked from commit 1efe441) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
This was referenced Aug 17, 2026
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| 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``, |
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Strictly speaking, not all of these apply to 3.13, for examply lazy_imports is 3.15. We haven't been that picky in the 3.14 backport, either, and the tests pass, because unsupported -X options are just silently ignored.
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Thanks for catching this and for opening #155965!
Using os_helper.temp_dir() should make the test portable on Windows.
Good point about the version-specific options as well.
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Propagate all -X command line options to multiprocessing spawned child Python processes. (cherry picked from commit 1efe441)
-Xoptions do not auto-propagate to multiprocessing processes #146004