Build failure with Xcode 8 beta on OSX 10.11

[ronaldoussoren]

BPO	27596
Nosy	@ronaldoussoren, @ned-deily
Superseder	bpo-29057: Compiler failure on Mac OS X - sys/random.h

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ronaldoussoren'
closed_at = <Date 2017-01-19.23:12:35.015>
created_at = <Date 2016-07-23.10:49:43.480>
labels = ['OS-mac', 'build']
title = 'Build failure with Xcode 8 beta on OSX 10.11'
updated_at = <Date 2017-01-19.23:20:37.658>
user = 'https://github.com/ronaldoussoren'

bugs.python.org fields:

activity = <Date 2017-01-19.23:20:37.658>
actor = 'Maxime Belanger'
assignee = 'ronaldoussoren'
closed = True
closed_date = <Date 2017-01-19.23:12:35.015>
closer = 'ned.deily'
components = ['macOS']
creation = <Date 2016-07-23.10:49:43.480>
creator = 'ronaldoussoren'
dependencies = []
files = []
hgrepos = []
issue_num = 27596
keywords = []
message_count = 5.0
messages = ['271069', '271070', '285853', '285857', '285859']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'Maxime Belanger']
pr_nums = []
priority = 'low'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '29057'
type = 'compile error'
url = 'https://bugs.python.org/issue27596'
versions = ['Python 3.6']

[ronaldoussoren]

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.

[ronaldoussoren]

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.

[MaximeBelanger]

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 makeing. Is a patch is in the works to support weak-linking this symbol (and the other new Sierra additions)?

[ned-deily]

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 bpo-29057. 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 bpo-29057)

[MaximeBelanger]

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