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Further experimentation revealed that freeze_support() works properly
and the proposed patch is not necessary or desirable for the general
freeze case. In the case of an embedded app that calls set_executable()
it seems that the "else" block calling _python_exe should be taken but
won't be, so I still think there may be a problem here.
In our situation it turned out that an imported module was grabbing the
command line arguments before freeze_support() was called and when that
was addressed the need for a separate python executable and calling
set_executable() was eliminated.
I suggest that the documentation for freeze_support() make it clear that
it must get called before an application processes the arguments or that
the application must allow a --multiprocessing-fork option with a string
value so that the initialization continues until freeze_support() is called.