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I just noticed that building the Xcode 8 beta 2 on OSX 10.11 results in a link failure of the python binary.
Based on a quick glance at the error (before switching back to Xcode 7):
1) macOS 10.12 appears to have a getentropy function that's detected
 by the configure script.
 
2) For some reason the build environment for configure and the actual build
 are different resulting in the link error.
Even with the link failure fixed the build will fail because getentropy isn't present on 10.11 and hence the binary won't work on 10.11.
IMHO it would be worthwhile to at least create a patch that makes it possible to use Xcode 8 for building on OSX 10.11, and better yet deploy on older OSX releases.
Based on the invasiveness of such a patch we could discuss if the patch would be acceptable for merging.

P.S. This issue is mostly a reminder for myself, Xcode 8 is still in beta and hence patches to CPython to support it are IMHO still out of scope for merging at this time.

We're hitting this issue with Python 2.7 (which we deploy on Mac OS X 10.6-10.12). We've worked around it by manually patching `pyconfig.h` to un-define `HAVE_GETENTROPY` before `make`ing. Is a patch is in the works to support weak-linking this symbol (and the other new Sierra additions)?

Maxime, there have been a couple of attempts to address this problem. We believe it now finally fixed for all versions of macOS from 10.6 through 10.12 by the changes in Issue29057. Unfortunately, for 2.7,x the last set of fixes were after the release of 2.7.13 in December so, until 2.7.14 is released, you may need to manually apply changeset 74eb71b91112. (Closing this issue as a duplicate of Issue29057)

Glad to hear it! Thanks for the quick followup :).