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ci: cache compiler installs and shorten pull request validation - #68
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LunaStev merged 2 commits intoOct 28, 2026
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Compiler installation currently takes roughly 110–136 seconds on Linux and 330 seconds on macOS before compilation begins. Cache the actual installed GHC/Cabal toolchain before the setup action, keyed by runner image, OS, architecture, and exact compiler version. Disable the setup action's implicit Cabal index update; extended validation retains its explicit update.
Regular pull requests and master pushes run the primary GHC 9.10.3 Linux debug build, including Wave integration, native/Python checks, ABI checks, 100,000 fuzz inputs, and native benchmark smoke. Extended properties/interchange/Criterion and the six clean Python wheel tests remain enabled. The complete GHC 9.6/9.10 debug/release matrix and macOS/Windows build probes run weekly and remain available manually through Full compatibility or Validate's full-matrix input.
Validation: actionlint and whitespace checks pass. The first run populates the compiler cache; subsequent run timings must confirm the improvement.