Multiprocessing not propagating -Xfrozen_modules=off #106723
Description
Bug report
After python3.11 changes around frozen imports, when using multiprocessing contexts other than fork, the newly added -Xfrozen_modules=off isn't passed to spawned process interpreters.
Simple snippet demonstrating the issue:
""" $ python -Xfrozen_modules=off test.py main: {'frozen_modules': 'off'} forkserver: {} spawn: {} fork: {'frozen_modules': 'off'} """ import sys import multiprocessing def xoptions(): return sys._xoptions def main(): print('main:', xoptions()) for ctx in ('forkserver', 'spawn', 'fork'): with multiprocessing.get_context(ctx).Pool(1) as pool: print(f'{ctx}:', pool.apply(xoptions)) if __name__ == '__main__': main()The issue seems to be subprocess._args_from_interpreter_flags not honoring frozen_modules key from sys._xoptions.
$ python -Xfrozen_modules=off -c 'import subprocess;print(subprocess._args_from_interpreter_flags())' []Your environment
python 3.11.4