[issue45020] Freeze all modules imported during startup.

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

Eric, I noticed that you are freezing os.py. Please be aware that
this module is often being used as indicator for where the stdlib
was installed (the stdlib itself does this in site.py to read the
LICENSE and the test suite also uses os.__file__ in a couple of
places).

It may be worth changing the stdlib to pick a different module
as landmark for this purpose.

Also: Unless you have added the .__file__ attribute to frozen
modules, much of this landmark checking code will fail... which is
the reason I added the attribute to frozen modules in PyRun.

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<https://bugs.python.org/issue45020>
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