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gh-144278: Enable overriding TAG (sys.implementation.cache_tag) when building sysmodule.c#144293

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@zoobazooba commentedJan 27, 2026•
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In particular, this allows defining in to NULL, which has the effect of disabling automatic .pyc caching.
We also update tests to handle the cache tag being None, which was always allowed, but was not accounted for in tests.

… sys.implementation.cache_tag.This has the effect of disabling automatic .pyc caching.
@zoobazooba changed the titlegh-144278: Enable defining _PY_DISABLE_SYS_CACHE_TAG to disable sys.implementation.cache_taggh-144278: Enable overriding TAG (sys.implementation.cache_tag) when building sysmodule.cJan 28, 2026
@hugovkhugovk removed their request for reviewJanuary 28, 2026 18:01
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If anyone stumbles into here and has any idea why execution is 2-3x slower whencache_tag is None, I'd love to hear about it. The test failures/cancellations are timeouts/time-sensitivity issues, not poor functionality, but I can't come up with any reason why it would be so much slower.

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