Configure on Apple ARM: "Unexpected output of 'arch' on OSX"

[mistydemeo]

BPO	42056
Nosy	@ronaldoussoren, @mistydemeo
PRs	bpo-42056: macOS - allow arm64 as a supported arch #22732
Superseder	bpo-41100: Support macOS 11 and Apple Silicon Macs

^{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 = None
closed_at = <Date 2020-10-19.10:09:29.136>
created_at = <Date 2020-10-16.22:47:17.007>
labels = ['build', '3.9']
title = 'Configure on Apple ARM: "Unexpected output of \'arch\' on OSX"'
updated_at = <Date 2020-10-19.10:09:29.135>
user = 'https://github.com/mistydemeo'

bugs.python.org fields:

activity = <Date 2020-10-19.10:09:29.135>
actor = 'ronaldoussoren'
assignee = 'none'
closed = True
closed_date = <Date 2020-10-19.10:09:29.136>
closer = 'ronaldoussoren'
components = ['Build']
creation = <Date 2020-10-16.22:47:17.007>
creator = 'mistydemeo'
dependencies = []
files = []
hgrepos = []
issue_num = 42056
keywords = ['patch']
message_count = 3.0
messages = ['378776', '378806', '378936']
nosy_count = 2.0
nosy_names = ['ronaldoussoren', 'mistydemeo']
pr_nums = ['22732']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '41100'
type = 'compile error'
url = 'https://bugs.python.org/issue42056'
versions = ['Python 3.9']

[mistydemeo]

Configure's arch check on Macs running with Apple Silicon CPUs will fail because the list of acceptable architectures is hardcoded to Intel and PowerPC: https://github.com/python/cpython/blob/master/configure.ac#L2486-L2496

This needs a clause that adds "arm64" as an acceptable arch.

[ronaldoussoren]

I have a PR that implements support for Apple Silicon:

#21564

Sadly this is not yet complete. I hope to make progress again during the core sprint next week.

[ronaldoussoren]

I'm closing this issue because it is a duplicate of bpo-41100, the patches needed to build on Apple Silicon are more involved than just a configure check.