[issue26774] Elide Py_atomic fences when WITH_THREAD is disabled?

[STINNER Victor]

STINNER Victor added the comment:

I never liked the option to disable thread support. I don't think that
anyone uses it but it requires many #ifdef in the code. I would prefer to
drop the option.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26774>
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