Support macOS 11 and Apple Silicon Macs

[ronaldoussoren]

BPO	41100
Nosy	@ronaldoussoren, @vstinner, @ned-deily, @skrah, @jmroot, @ambv, @jreese, @dirn, @mattip, @indygreg, @maxbelanger, @eamanu, @corona10, @isuruf, @miss-islington, @mistydemeo, @erlend-aasland, @nieder, @lawrence-danna-apple, @benoithudson, @harlantc
PRs	bpo-41100: Support macOS 11 when building #21113 [3.9] bpo-41100: Support macOS 11 when building (GH-21113) #21153 [3.8] bpo-41100: Support macOS 11 when building (GH-21113) #21154 [3.7] bpo-41100: Support macOS 11 when building (GH-21113) #21155 bpo-41100: clarify NEWS item about macOS 11 support #21174 [3.9] bpo-41100: clarify NEWS item about macOS 11 support (GH-21174) #21175 [3.8] bpo-41100: clarify NEWS item about macOS 11 support (GH-21174) #21176 bpo-41100: allow python to build for macosx-11.0-arm64 #21224 bpo-41100: fix _decimal for arm64 Mac OS #21228 bpo-41100: use system libffi for Mac OS 10.15 and up #21239 bpo-41100: ctypes: check _dyld_shared_cache_contains_path in find_library #21241 bpo-41100: ctypes: use the correct ABI for variadic functions #21242 bpo-41100: ctypes fixes for arm64 Mac OS #21249 bpo-41100: test fixes for Mac OS 11 #21266 bpo-41100: pythonw: add arm64 support #21268 BPO-41100: macOS branch #21564 bpo-41100: add runtime checks for MACOSX_DEPLOYMENT_TARGET=10.10 #21576 bpo-41100: add runtime checks for MACOSX_DEPLOYMENT_TARGET=10.10 #21577 bpo-41100: deploy to an earlier version of macOS #21583 bpo-41100: bugfix, arm64 Mac OS, missing #include <AvailabilityMacros.h> #21588 bpo-41100: Support macOS 11 and Apple Silicon #22855 bpo-41101: Support "arm64" in Mac/Tools/pythonw #21114 bpo-41090: Add support for building "Universal 2" binaries on macOS 11. #21115 bpo-41100: add support for "universal2" ie arm64,x86_64 universal build #21246 bpo-41100: Support macOS 11 and Apple Silicon (GH-22855) #23239 bpo-41100: Stripping '-arch arm64' didn't work after all #23280 [3.9] bpo-41100: Support macOS 11 and Apple Silicon (GH-22855) #23295 bpo-42361: Use Tcl/Tk 8.6.10 when building the installer on recent macOS #23293 [3.9] bpo-41100: Update Whatsnew and installer ReadME for 3.9.1 #23472 bpo-41100: minor build installer fixes #23480 [3.9] bpo-41100: minor build installer fixes (GH-23480) #23484 bpo-41100: in test_platform, ignore 10.16 #23485 [3.9] bpo-41100: in test_platform, ignore 10.16 (GH-23485) #23486 [3.6] bpo-41100: Support macOS 11 when building (GH-21113) #21155 #25014 [3.8] bpo-41100: Support macOS 11 and Apple Silicon #25274 [3.8] bpo-41100: Support macOS 11 Big Sur and Apple Silicon Macs #25806 bpo-41100: Update Misc/ACKS #25808 [3.9] bpo-41100: Update Misc/ACKS (GH-25808) #25809 [3.8] bpo-41100: Support building with new macOS SDK (GH-22855) #26474
Files	build.log: build log for ARM M1 Big Sur

^{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 2021-05-02.21:13:19.655>
created_at = <Date 2020-06-24.11:51:07.053>
labels = ['OS-mac', 'build', '3.8', '3.9', '3.10']
title = 'Support macOS 11 and Apple Silicon Macs'
updated_at = <Date 2021-05-31.18:07:58.057>
user = 'https://github.com/ronaldoussoren'

bugs.python.org fields:

activity = <Date 2021-05-31.18:07:58.057>
actor = 'isuruf'
assignee = 'ronaldoussoren'
closed = True
closed_date = <Date 2021-05-02.21:13:19.655>
closer = 'ned.deily'
components = ['Build', 'macOS']
creation = <Date 2020-06-24.11:51:07.053>
creator = 'ronaldoussoren'
dependencies = []
files = ['49962']
hgrepos = []
issue_num = 41100
keywords = ['patch']
message_count = 43.0
messages = ['372245', '372371', '372374', '372375', '372376', '372456', '372457', '372458', '372652', '372672', '372680', '372716', '374315', '375532', '375572', '379230', '380538', '381091', '381097', '381585', '381608', '381640', '381701', '381702', '381708', '381709', '382932', '382939', '386664', '386740', '387526', '390505', '390561', '390562', '391138', '391141', '391142', '391146', '392675', '392680', '392682', '392683', '392734']
nosy_count = 24.0
nosy_names = ['ronaldoussoren', 'vstinner', 'ned.deily', 'skrah', 'jmr', 'lukasz.langa', 'jreese', 'python-dev', 'dirn', 'mattip', 'indygreg', 'Maxime Belanger', 'maxbelanger', 'eamanu', 'corona10', 'isuruf', 'miss-islington', 'mistydemeo', 'erlendaasland', 'nieder', 'lawrence-danna-apple', 'Mika_Hawkins', 'benoithudson', 'harlantc']
pr_nums = ['21113', '21153', '21154', '21155', '21174', '21175', '21176', '21224', '21228', '21239', '21241', '21242', '21249', '21266', '21268', '21564', '21576', '21577', '21583', '21588', '22855', '21114', '21115', '21246', '23239', '23280', '23295', '23293', '23472', '23480', '23484', '23485', '23486', '25014', '25274', '25806', '25808', '25809', '26474']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue41100'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[ronaldoussoren]

macOS 11 is darwin 20.0.0. This confuses the configure script, resulting in defining _POSIX_C_SOURCE and friends.

[ned-deily]

New changeset 8ea6353 by Ronald Oussoren in branch 'master':
BPO-41100: Support macOS 11 when building (GH-21113)
8ea6353

[miss-islington]

New changeset ad7a667 by Miss Islington (bot) in branch '3.9':
BPO-41100: Support macOS 11 when building (GH-21113)
ad7a667