Author tjguk
Recipients ned.deily, paul.moore, skn78, steve.dower, thatiparthy, tim.golden, tjguk, zach.ware
Date 2017-12-21.17:09:09
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Message-id <af80aafc-2955-61bf-85d4-328cb5879407@timgolden.me.uk>
In-reply-to <1513875550.2.0.213398074469.issue32394@psf.upfronthosting.co.za>
Content
It's a compile-time option in socketmodule.c.

https://github.com/python/cpython/blob/3.6/Modules/socketmodule.c#L7466

The MSDN page suggests that it was added for Win10:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms738596(v=vs.85).aspx

Is it possible that the build machine has changed its OS/SDK between 
building 3.6.3 and 3.6.4?
History
Date User Action Args
2017-12-21 17:09:10tjguksetrecipients: + tjguk, paul.moore, tim.golden, ned.deily, zach.ware, steve.dower, thatiparthy, skn78
2017-12-21 17:09:10tjguklinkissue32394 messages
2017-12-21 17:09:10tjgukcreate