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CI: Arm's 13.2.Rel1 toolchain tarball (cached) on the QEMU legs instead of apt gcc-arm-none-eabi - #82
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…nstead of apt gcc-arm-none-eabi Ubuntu's gcc-arm-none-eabi pulls the 463 MB libstdc++-arm-none-eabi-newlib package from the runner's Azure mirror. That fetch stalled past the 15-minute step limit three times on 2026-10-01 (#81 twice, #80 once) after eating two 45-minute legs on #67. Both Cortex legs now restore Arm's arm-gnu-toolchain-13.2.rel1-x86_64-arm-none-eabi from the Actions cache, or download it (179 MB from Arm's CDN, curl with retries, verified against Arm's published sha256) on a miss, and put its bin on PATH; only qemu-system-arm still comes from apt. It is the same upstream release Ubuntu noble packages (15:13.2.rel1-2), so the fingerprint and icount gates on this PR's own run are the check that the numerics did not move. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DDhgJqxUsdmWPKh6pKrV5A
…me cached tarball Its own apt install of gcc-arm-none-eabi stalled on the 463 MB libstdc++-arm-none-eabi-newlib fetch and was cancelled at the job's 60-minute limit on this PR's first run (job 110569401398); the mirror served the 11 MB qemu-system-arm package in two minutes on the same run. Same cache key and download step as the Cortex legs; the apt step keeps qemu-system-arm and the plugin build dependencies, with retries and timeouts. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DDhgJqxUsdmWPKh6pKrV5A
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The Cortex-M33 and M55 legs stop depending on Ubuntu's
gcc-arm-none-eabipackage.Why. That package pulls the 463 MB
libstdc++-arm-none-eabi-newlibfrom the runner's Azure mirror, and the fetch stalled past the 15-minute step limit three times today (#81 twice, #80 once) after eating two 45-minute legs on #67. #72's retries and timeout made the stall cheap; this makes it go away.What. Both legs restore
arm-gnu-toolchain-13.2.rel1-x86_64-arm-none-eabifrom the Actions cache, or on a miss download it from Arm (179 MB, curl with retries and a connect timeout), verify it against Arm's published.sha256asc, extract it under$RUNNER_TEMP, and put itsbinonPATH. The toolchain files already namearm-none-eabi-gcc/g++by bare name, so nothing else changes. Onlyqemu-system-armstill comes from apt (small). The cache action is the same pinned v5 SHA the repo already uses.The check. It is the same upstream release Ubuntu noble packages (
15:13.2.rel1-2), so themutap_fingerprintand icount gates on this PR's own run are the evidence that the M33 / M55 numerics did not move. If a leg's fingerprint lines or icount baselines do move, this PR does not re-record them — that would mean Debian's build differs from Arm's, and it gets reported instead.🤖 Generated with Claude Code
https://claude.ai/code/session_01DDhgJqxUsdmWPKh6pKrV5A