ci: the wai-quantum legs build the commit they test, and fail when they did not #666
2026-11-06
Merge main into ci/quantum-archive-mtime: the emulated legs bring their own emulator (#674)
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Main now runs the vector and SME emulated legs under the job's pinned QEMU, so this branch's sve, rvv and SME legs no longer depend on which `linux` runner claims them. The two changes touch different lines of both workflows. Co-Authored-By: Claude Opus 5.5 <[email protected]>
ci: the wai-quantum legs build the commit they test, and fail when they did not
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Seven wai-quantum workflows (processors, dsp, dataflow, sme, tensor-engine, tensor-program, vector) take the forge's archive of the commit, extract it to the same path on every run, and build into a target directory kept in the runner's cache. tar gave every file its commit's time, and cargo takes a crate as built when no source file is newer than its last build. So a commit older than the cache's last build ran the binary another commit had built there, and its tests said nothing about its own code. On 5 Nov, 16 emulated legs went green on another commit's binary, and #662's three reds were its legs running #660's two frame_reference tests against #662's check for three. - Fetch the source extracts with tar -m: every file gets the time it was extracted. - That alone does not close it. Each build waits on the host-wide lock after its extraction, and another run can build in the cache meanwhile, after which this one's files are again the older. So every step that builds touches the extracted tree once it holds the lock. - The first build in each such step must print "Compiling wai-quantum v..."; one that compiled nothing fails the leg, saying its tests would run a binary already in the cache. The host-runner legs (macOS, linux-hw, linux-amd, linux-arm64) check out with git into a fresh tree, and are not changed here. Co-Authored-By: Claude Opus 5.5 <[email protected]>