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Earlier framing was wrong — the wall isn't 'Arch ARM clang 22 vs Arch x86_64 clang 23'. Arch x86_64 is also on 22.1.3; LLVM 23 isn't anywhere in extra/staging. The flags chromium 147 emits come from chromium's clang fork (Google maintains an LLVM fork with chromium-specific passes), not upstream LLVM 23. PKGBUILD'ing clang 23 is the wrong tree. Right tree: cross-compile from x86_64 so chromium's bundled clang prebuilt is reachable. CIPD has full linux-amd64 prebuilts, gclient sync works cleanly, no qemu-x86_64-static dance needed. his provisioned CT 220 chromium-builder-x86 on data (Ryzen 7 1700, 14 cores, 32 GiB RAM, 200 GiB ZFS). data is normally asleep — woke via /opt/herding/bin/wake-data. Reach pattern: hertz -> ssh data -> pct exec 220. Source fetch running as chromium-fetch.service transient unit on CT 220. Once src is in, plan: tools/clang/scripts/update.py for chromium's bundled clang + arm64 sysroot, gn gen with target_cpu=arm64, build, transfer aarch64 binary to ohm/fresnel/ampere. boltzmann chromium-builder LXD container preserved as fallback; can be torn down if cross-compile pans out. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>