New submission from Sumanth Ratna <sumanthra...@gmail.com>: The following all return None on macOS Big Sur, but return a valid path (str) on macOS Catalina:
python3.6 -c "from ctypes import util; print(util.find_library('objc'))" python3.7 -c "from ctypes import util; print(util.find_library('objc'))" python3.8 -c "from ctypes import util; print(util.find_library('objc'))" The solution I'm thinking of is using platform.mac_ver() in ctypes.util.find_library to see if the macOS version is either 10.16 or 11.0; if so, use an alternative method to locate the path of the library somehow—else, use the current functionality. I'm hoping that looking in /System/Library/Frameworks/ is enough. >From the macOS Big Sur release notes >(https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11-beta-release-notes): > New in macOS Big Sur 11 beta, the system ships with a built-in dynamic linker > cache of all system-provided libraries. As part of this change, copies of > dynamic libraries are no longer present on the filesystem. Code that attempts > to check for dynamic library presence by looking for a file at a path or > enumerating a directory will fail. Instead, check for library presence by > attempting to `dlopen()` the path, which will correctly check for the library > in the cache. (62986286) Related links: - https://bugs.python.org/issue41116 (this is a build issue, but is related I think) - https://stackoverflow.com/questions/62587131/macos-big-sur-python-ctypes-find-library-does-not-find-libraries-ssl-corefou - https://www.reddit.com/r/MacOSBeta/comments/hfknpa/is_corefoundation_missing_for_everyone_on_big_sur/ - https://github.com/vispy/vispy/issues/1885 - https://github.com/napari/napari/issues/1393 - https://github.com/espressif/esptool/issues/540 This is my first issue in Python; sorry in advance if I've made a mistake anywhere. ---------- components: ctypes messages: 372728 nosy: Sumanth Ratna priority: normal severity: normal status: open title: find_library on macOS Big Sur type: behavior versions: Python 3.6, Python 3.7, Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41179> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com