macOS cannot compute sizeof (long double)

[allenlili]

BPO	43724
Nosy	@ned-deily, @allenlili
Files	config.log

^{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 2021-04-04.16:14:02.306>
created_at = <Date 2021-04-04.02:51:14.038>
labels = ['build', '3.9']
title = 'macOS cannot compute sizeof (long double)'
updated_at = <Date 2021-04-04.16:30:33.077>
user = 'https://github.com/allenlili'

bugs.python.org fields:

activity = <Date 2021-04-04.16:30:33.077>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-04.16:14:02.306>
closer = 'ned.deily'
components = []
creation = <Date 2021-04-04.02:51:14.038>
creator = 'allenlili'
dependencies = []
files = ['49933']
hgrepos = []
issue_num = 43724
keywords = []
message_count = 2.0
messages = ['390199', '390200']
nosy_count = 2.0
nosy_names = ['ned.deily', 'allenlili']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue43724'
versions = ['Python 3.9']

[ned-deily]

From the config.log you supplied, it looks the macOS system you are running on was upgraded to the current latest version, 11.2.3, but the Command Line Tools were not. It seems that with recent macOS releases, you often need to do that manually for each bugfix release. Try:

xcode-select --install

If successful, you should see currently:

cc --version
Apple clang version 12.0.0 (clang-1200.0.32.29)

[ned-deily]

P.S. Also check System Preferences -> Software Update for any updates to the Command Line Tools.