ci: build mathlib's cache executable - #87
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Mathlib's own CI compiles the `cache` tool (`lake build cache check-yaml graph`) before the main build, so a Lean or Lake change that breaks `Cache/*.lean` turns Mathlib's nightly-testing branch red at once. lean4#15142 did exactly that today: `Lake.PackageEntrySrc.path` gained a `copy` flag and `Cache/Requests.lean:988` fails with `Missing cases: (Lake.PackageEntrySrc.path _ true)`. Downstream only built `Mathlib`, `Archive`, `Counterexamples` and `Wanted`, none of which import `Cache`, so it never noticed and no adaptation branch exists for it. Add `cache` to mathlib4's `build_targets` so the executable is compiled with the same `--wfail` as the rest. It depends only on core Lean and Lake, adds 41 jobs and links in a few seconds. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016T7xJY6pLYrh99DNzwj7oo
Kha
marked this pull request as ready for review
September 20, 2026 09:58
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Build report for ci: build mathlib's
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| Repo | Critical | Build | Test | Lint |
|---|---|---|---|---|
| cslib | 🟥 in 6s | ⏭️ | ⏭️ |
Stayed green
| Repo | Critical | Build | Test | Lint |
|---|---|---|---|---|
| aesop | ✅ | ✅ in 7s | ✅ in 4s | ⏭️ |
| batteries | ✅ | ✅ in 4s | ✅ in 4s | ✅ in 2s |
| import-graph | ✅ | ✅ in 2s | ✅ in 4s | ⏭️ |
| lean4-cli | ✅ | ✅ in 1s | ✅ in 0s | ⏭️ |
| mathlib4 | ✅ | ✅ in 187s | ✅ in 329s | ✅ in 97s |
| plausible | ✅ | ✅ in 2s | ✅ in 2s | ⏭️ |
| ProofWidgets4 | ✅ | ✅ in 3s | ✅ in 1s | ⏭️ |
| quote4 | ✅ | ✅ in 2s | ✅ in 1s | ⏭️ |
| reference-manual | ✅ | ✅ in 15s | ⏭️ | ⏭️ |
| BibtexQuery | ✅ in 1s | ⏭️ | ⏭️ | |
| comparator | ✅ in 2s | ⏭️ | ⏭️ | |
| doc-gen4 | ✅ in 3s | ⏭️ | ⏭️ | |
| illuminate | ✅ in 4s | ✅ in 11s | ⏭️ | |
| lean4-unicode-basic | ✅ in 2s | ⏭️ | ⏭️ | |
| lean4export | ✅ in 0s | ✅ in 8s | ⏭️ | |
| LeanSearchClient | ✅ in 1s | ✅ in 0s | ⏭️ | |
| leansqlite | ✅ in 4s | ✅ in 19s | ⏭️ | |
| nerodia | ✅ in 3s | ✅ in 21s | ⏭️ | |
| repl | ✅ in 1s | ✅ in 56s | ⏭️ | |
| verso | ✅ in 36s | ✅ in 171s | ⏭️ | |
| verso-slides | ✅ in 7s | ✅ in 9s | ⏭️ | |
| verso-web-components | ✅ in 2s | ⏭️ | ⏭️ |
Garmelon
approved these changes
Sep 20, 2026
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Mathlib's own CI compiles the
cachetool before the main build (lake build cache check-yaml graphin its setup step), so a Lean or Lake change that breaksCache/*.leanturns Mathlib's nightly-testing branch red immediately.🤖 Generated with Claude Code