[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at 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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