[issue42591] Method Py_FrozenMain missing in libpython3.9

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I wrote PR 23730 to fix the issue. Would it be possible for you to test it?

Since Python 3.9, symbols which are not explicitly exported are no longer exported. Python now uses -fvisibility=hidden.

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<https://bugs.python.org/issue42591>
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