Support for "Universal 2" binary builds

[ronaldoussoren]

BPO	41090
Nosy	@ronaldoussoren, @mdickinson, @ned-deily
PRs	bpo-41090: Add support for building "Universal 2" binaries on macOS 11. #21115
Superseder	bpo-41100: Support macOS 11 and Apple Silicon Macs
Files	universal2.patch

^{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 2020-07-26.14:14:50.287>
created_at = <Date 2020-06-23.11:53:05.464>
labels = ['OS-mac', '3.8', '3.9', '3.10']
title = 'Support for "Universal 2" binary builds'
updated_at = <Date 2020-07-26.14:14:50.286>
user = 'https://github.com/ronaldoussoren'

bugs.python.org fields:

activity = <Date 2020-07-26.14:14:50.286>
actor = 'ronaldoussoren'
assignee = 'ronaldoussoren'
closed = True
closed_date = <Date 2020-07-26.14:14:50.287>
closer = 'ronaldoussoren'
components = ['macOS']
creation = <Date 2020-06-23.11:53:05.464>
creator = 'ronaldoussoren'
dependencies = []
files = ['49258']
hgrepos = []
issue_num = 41090
keywords = ['patch']
message_count = 5.0
messages = ['372160', '372163', '372165', '372171', '374313']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'mark.dickinson', 'ned.deily']
pr_nums = ['21115']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '41100'
type = None
url = 'https://bugs.python.org/issue41090'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[ronaldoussoren]

The attached patch implements "universal2" as an option for "--with-univeral-archs" to enable building "Universal 2" binaries on macOS (with x86_64 and arm64 code).

This is an extension of the already existing support for other flavours of fat binaries on macOS.

NOTE: I've attached a patch instead of creating a PR because I'm not logged on to GitHub in the macOS 11 VM where I created this patch. I'll obviously create a PR later.

[mdickinson]

@ronald: a bit off-topic for this issue, but do you know if there are or will be any publicly available developer resources for people moving to Apple Silicon? For obvious reasons, I'm interested in what the floating-point and libm situation is going to look like.

[mdickinson]

a bit off-topic for this issue

Apologies: on reflection, it's way off-topic. Please ignore this and the last message; I'll find a more appropriate place to take this up.

[ronaldoussoren]

I only know what's on Apple website. There will be documentation, and there is developer hardware. I do have a VM running the new macOS with a version of Xcode that can compile for the new hardware, but that's where it ends for me.