Ronald Oussoren <ronaldousso...@mac.com> added the comment:

This is not a bug in Xcode 11. Xcode 11 includes definitions for new flags that 
get picked up by Python's build, but only work on a new version of macOS. 

I guess this could be seen as a bug in macOS 10.14 (and earlier) because it 
ignores an unknown flag instead of returning an error.  Knowing Apple that's 
unlikely to get fixed, if it even is a bug 
(<http://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_spawnattr_getflags.html>
 says that returning EINVAL is optional for an invalid value of "flags").

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37586>
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