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Oleksandr ShyshatskyiandClaude Opus 5
3a28fdf65b
test-chelper.py compared c_helper.so's exported symbols against the cdef blocks in the klippy tree shipped beside it, and bin/patch.sh ran it as a hard build gate with ALLOW_STALE_CHELPER=1 as the escape hatch. Both are gone, along with the Makefile target, the suite entry and the ALLOW_STALE_CHELPER passthrough that had nothing left to pass through. patch.sh still refuses a c_helper.so that is not MIPS32r2/nan2008/o32, so the ABI failure mode is still caught. The symbol failure mode is not: cffi resolves lazily, so a .so older than its klippy imports cleanly, passes the ABI check, installs, boots, and dies at connect with a traceback that names cffi rather than the stale build. That is a real thing that shipped once, so it is written down in docs/building.md and docs/notes/20-klipper-fork.md rather than left for someone to rediscover -- the fork path this guarded is winding down anyway, per the same note. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>