ci: build darwin-x86_64 natively on macos-15-intel#11
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alexeagle merged 2 commits intoJun 30, 2026
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GitHub retired its last Intel hosted runner (macos-13), so the darwin-x86_64 release leg sat 24h "awaiting a runner" and never built, blocking the whole release (run 28265340973) and shipping 8.6.0-figma2 without the macOS Intel asset. Build darwin-x86_64 on macos-14 (Apple silicon) via --cpu=darwin_x86_64 --macos_cpus=x86_64, using the arm64 bootstrap Bazelisk for the host. This is exactly the cross-compile fallback the prior code comment anticipated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Supersedes the --cpu cross-compile attempt, which failed: cross-compiling darwin-x86_64 from an arm64 runner makes abseil's randen_hwaes apply -maes/-msse4.1 to the arm64 exec-config tools (bazelbuild#14803). Upstream Bazel avoids this by building each arch natively on dedicated macOS machines (bazelci.py macos vs macos_arm64 queues); we do the same using GitHub's native Intel image. macos-13 was retired 2025-12-04, which is why the leg starved for a runner and blocked the release (run 28265340973). macos-15-intel is GitHub's replacement native x86_64 image (available until ~Aug 2027). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
alexeagle
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LGTM thanks Claude |
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Problem
GitHub retired its Intel runner
macos-13on 2025-12-04 (changelog, runner-images#13046). Thebuild darwin-x86_64leg is pinned tomacos-13, so it sits "awaiting a runner" until GitHub's 24h queue ceiling kills it — it never starts. Becausereleasehasneeds: [..., build-darwin], this blocks the entire release.That's what happened on run 28265340973: the other three legs built in ~15–17m, darwin-x86_64 timed out after 24h, and
8.6.0-figma2shipped withoutbazel-8.6.0-figma2-darwin-x86_64— Intel-Mac bazelisk gets a 404.Why native (not cross-compile or Rosetta)
I first tried cross-compiling from an arm64
macos-14runner (--cpu=darwin_x86_64 --macos_cpus=x86_64). It fails: abseil'sranden_hwaesapplies x86-only-maes/-msse4.1to the arm64 exec-config build tools (clang++: error: unsupported option '-maes' for target 'arm64'), a known Bazel macOS cross-compile pitfall (bazelbuild/bazel#14803, #24264).Upstream Bazel doesn't cross-compile either — its release CI builds each macOS arch natively on dedicated machines, via separate
macosandmacos_arm64Buildkite queues (bazelci.py). No--cpu, no Rosetta anywhere.Fix
Move the
darwin-x86_64leg to GitHub's native Intel imagemacos-15-intel(runner-images#13045) — the documented replacement for the retiredmacos-13. The build stays a plain native build (no--cpuflags, no emulation), identical in shape to the oldmacos-13path.darwin-x86_64matrix leg:runner: macos-13→macos-15-intel(keepsbazelisk_arch: amd64)TODO(aeagle)for the ~Aug 2027 hosted-x86_64 sunset (move to a self-hosted Intel Mac or drop Intel then)Test plan
workflow_dispatcha release; confirmbuild darwin-x86_64picks up amacos-15-intelrunner and builds natively (no 24h queue wait)bazel-<ver>-darwin-x86_64(+.sha256)filereports a Mach-O x86_64 binary and it runs on a macOS Intel host🤖 Generated with Claude Code