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ccache with CCACHE_COMPILERCHECK=content everywhere: every cache entry is keyed on the CONTENT of the compiler binary plus the fully preprocessed translation unit, so a hit is provably the identical compilation - a stale, foreign, or corrupted cache can only MISS, never return wrong output. No CCACHE_BASEDIR and no path rewriting: debug info and sanitizer report paths stay exact. Locally scripts/env.sh routes compilers through ccache's masquerade directories when present (opt-out CBM_NO_CCACHE=1) - $CC keeps its plain name, so verify_compiler, make, and link lines are untouched. CI caches are strictly per-ref by policy on top of GitHub's own branch scoping: keys embed github.ref, so no base-branch fallback - a new PR builds cold once and only its own pushes warm it. Cached: the four test jobs and the pr-smoke matrix. Release builds in _build.yml stay deliberately uncached. Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>