Ned Deily <n...@python.org> added the comment:
> This can be observed by using the python 3.9.1 universal2 installer and using
> it on
> x86_64 Big Sur or with Rossetta 2 on arm64 Big Sur.
When not manually setting SYSTEM_VERSION_COMPAT=1, I cannot reproduce this
behavior on current Big Sur (11.1) systems, either x86_64 or arm64 systems,
either with the 3.9.1 python.org universal2 installer (which was built on Big
Sur with deployment target of 10.9) or by building on 11.1 with
MACOSX_DEPLOYMENT_TARGET=10.15:
$ ./configure MACOSX_DEPLOYMENT_TARGET=10.15
$ make
$ ./python -m sysconfig | grep DEPLOYMENT_TARGET
CONFIG_ARGS = "'MACOSX_DEPLOYMENT_TARGET=10.15'"
MACOSX_DEPLOYMENT_TARGET = "10.15"
$ ./python -c "from ctypes.util import find_library;
print(find_library('AppKit'))"
/System/Library/Frameworks/AppKit.framework/AppKit
$ sw_vers
ProductName: macOS
ProductVersion: 11.1
BuildVersion: 20C69
$ uname -a
Darwin vana.local 20.2.0 Darwin Kernel Version 20.2.0: Wed Dec 2 20:39:59 PST
2020; root:xnu-7195.60.75~1/RELEASE_X86_64 x86_64
===========
$ arch
arm64
$ arch -arm64 /usr/local/bin/python3.9 -c 'import sys;print(sys.version)'
3.9.1 (v3.9.1:1e5d33e9b9, Dec 7 2020, 12:44:01)
[Clang 12.0.0 (clang-1200.0.32.27)]
$ arch -arm64 /usr/local/bin/python3.9 -c "from ctypes.util import
find_library; print(find_library('AppKit'))"
/System/Library/Frameworks/AppKit.framework/AppKit
$ arch -x86_64 /usr/local/bin/python3.9 -c "from ctypes.util import
find_library; print(find_library('AppKit'))"
/System/Library/Frameworks/AppKit.framework/AppKit
So, I believe that, while this is an issue when building Python on macOS 10.15
and executing on macOS 11, it is not a problem for the current python.org
universal2 installers. Am I missing something?
Further, I believe this issue is essentially a duplicate of Issue42619 which
has a draft (work-in-progress) PR to address this in a different way. We
should consider consolidating these issues.
Note that legacy 10.9+ x86_64-only installers *will* see the find_library()
failure because they are built on macOS 10.9. A fix for Issue42619 would solve
that problem for future "legacy" installers built on 10.9 (although we intend
to no longer produce such installers for Python 3.10.)
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<https://bugs.python.org/issue43052>
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