Repository navigation
Cothread builds but fails at runtime on MacOS Arm64 platforms #68
Description
Activity
- changed the title
[-]Cothread builds but fails on MacOS Arm64 platforms[/-][+]Cothread builds but fails at runtime on MacOS Arm64 platforms[/+]on Aug 8, 2024 cothread does not build on my MacOS Arm64.
- pip3.11 install cothread -> "Requirement already satisfied: cothread in /opt/homebrew/lib/python3.11/site-packages (2.19.1)"
However, following this, the import fails (runtime failure). If instead:
- pip3.11 install --force cothread -> the following:
clang: error: linker command failed with exit code 1 (use -v to see invocation) error: command '/usr/bin/clang' failed with exit code 1 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for cothread Failed to build cothread ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (cothread)It seems to complain as following on some (ld) illegal text-relocation in 'action_entry'+0x14 (../cothread_9b3efff422134250bc70b91cfdda0b17/build/temp.macosx-14.0-arm64-cpython-311/context/switch.o) to 'action_entry'
+1 does not build on macOS / arm64
Illegal text-relocations: text-relocation in 'action_entry'+0x14 (/private/var/folders/h9/35fh42mx3j77_2wsj653qw9r0000gn/T/pip-install-1gmsm1jy/cothread_6d5b85dca67f4251b33315afafec68d7/build/temp.macosx-15.0-arm64-cpython-313/context/switch.o) to 'action_entry' ld: Found illegal text-relocations clang: error: linker command failed with exit code 1 (use -v to see invocation) error: command '/usr/bin/clang' failed with exit code 1 [end of output]
performing
pip3 install cothreadon Python 3.13.7Potentially resolved in #76
- added a commit that references this issue
on Sep 17, 2025 - added a commit that references this issue
on Oct 6, 2025
Cothread claims to have support for arm64 architecture, denoted by the switch-arm64.c file. However, as noted in the last commit made, it does not actually work at runtime. During testing of p4p on the new GitHub OsX runners, which are all now arm64, we see a Bus Error:
In an ideal world we should fix the ARM64 code to allow use on modern MacOS systems. An alternative is to explicitly fail a compilation on a MacOS ARM platform (but leave it working for e.g. Rasberry Pi, which is the platform this code was originally written for).
Testing either of these fixes should be straightforward by using GitHub's
macos-latestrunner.