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Disable semantic interposition? #501

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@blopker

Red Hat recently released an article about how they improved Python's performance by 30% in Python 3.8 by disabling semantic interposition. Article: https://developers.redhat.com/blog/2020/06/25/red-hat-enterprise-linux-8-2-brings-faster-python-3-8-run-speeds/

Looks like they added the -fno-semantic-interposition flag to GCC.

Would this option make sense for this image?

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