New submission from Tobias Bergkvist <tob...@bergkv.ist>:
Python-binaries compiled on either Big Sur or Catalina - and moved to the other MacOS-version will not work as expected when code depends on ctypes.util.find_library. Example symptom of this issue: https://github.com/jupyterlab/jupyterlab/issues/9863 I have personally faced this when using Python from nixpkgs - since nixpkgs Python has been built on Catalina - and I'm using Big Sur. Scenario 1: Compile on Catalina, copy binaries to BigSur, and call ctypes.util.find_library('c') Python 3.11.0a0 (heads/main:635bfe8162, Jul 19 2021, 08:09:05) [Clang 12.0.0 (clang-1200.0.32.29)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from ctypes.util import find_library; print(find_library('c')) None Scenario 2: Compile on Big Sur, copy binaries to Catalina, and call ctypes.util.find_library('c'): Python 3.11.0a0 (heads/main:635bfe8162, Jul 19 2021, 08:28:48) [Clang 12.0.5 (clang-1205.0.22.11)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from ctypes.util import find_library; print(find_library('c')) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python3.11/ctypes/__init__.py", line 8, in <module> from _ctypes import Union, Structure, Array ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ImportError: dlopen(/usr/local/lib/python3.11/lib-dynload/_ctypes.cpython-311-darwin.so, 2): Symbol not found: __dyld_shared_cache_contains_path Referenced from: /usr/local/lib/python3.11/lib-dynload/_ctypes.cpython-311-darwin.so (which was built for Mac OS X 11.4) Expected in: /usr/lib/libSystem.B.dylib in /usr/local/lib/python3.11/lib-dynload/_ctypes.cpython-311-darwin.so ---------- components: ctypes messages: 397916 nosy: bergkvist priority: normal pull_requests: 25816 severity: normal status: open title: MacOS: Python binaries not portable between Catalina and Big Sur type: behavior versions: Python 3.10, Python 3.11, Python 3.8, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44689> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
