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Parsing and type‑checking — not linking — is often what makes CI builds stall. Stale or mismatched .swiftmodule files multiply that pain.
- Prebuild framework modules into explicit
.swiftmoduleand.swiftinterfaceartifacts in a dedicated CI job; store them with checksums and toolchain identifiers so consumers can restore cached artifacts instead of reparsing source. - Construct cache keys from dependency checksums plus compiler/toolchain identifiers and fail fast on checksum mismatch to avoid intermittent “module is out of date” failures.
- Enforce a narrow public surface (API review, codeowners) so you don’t widen visibility merely to paper over missing modules.
- Gate rollout with a canary pipeline that compares profiler traces and cache verification before broad consumption.
Choose explicit modules when incremental compile time is your dominant pain and your CI can reliably produce reproducible artifacts; prefer source builds when toolchain variance or maintenance cost is higher.
Emit os_signpost signposts and structured logs from your prebuild helpers to correlate cache hits, misses, and trace regressions for post‑mortem analysis.
How are you validating cache auditability and toolchain identity in your CI for Swift module reuse?