The vcpkg install was cloned at a floating HEAD while native/vcpkg.json
carried no builtin-baseline, so every run resolved the qtbase port afresh.
Its package ABI drifted whenever upstream vcpkg moved, the restored
actions/cache entry no longer matched, and qtbase was rebuilt from source
(~31 min) on every push. Because the cache key is static (hash of
vcpkg.json, unchanged since 05-23) the rebuilt tree was never saved back
either, so the miss repeated forever.
Pin both sides to vcpkg tag 2026.05.25
(d015e31e90838a4c9dfa3eed45979bc70d9357fc, qtbase 6.11.0):
- native/vcpkg.json: add "builtin-baseline"
- workflow: clone --branch 2026.05.25
Adding the baseline also changes the vcpkg.json hash, so this run gets a
fresh cache key, cold-builds Qt once, and saves it; subsequent runs match
the now-deterministic ABI and skip the qtbase build entirely.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Shirona1337
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