ci: cache mcpp's self-bootstrapped sandbox#3
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Sunrisepeak merged 1 commit intomainfrom May 9, 2026
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mcpp 0.0.3's binary lives at xim-x-mcpp/0.0.3/bin/mcpp; on first run it self-detects home as that grandparent and bootstraps musl-gcc + binutils + glibc + ninja + patchelf into <home>/registry/data/xpkgs. Toolchain set is version-pinned by mcpp 0.0.3, so a fixed cache key is safe. Cache-hit runs skip the ~800 MB download.
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actions/cache@v4for~/.xlings/data/xpkgs/xim-x-mcpp/0.0.3/registry(where mcpp populates musl-gcc + binutils + glibc + ninja + patchelf, ~800 MB, on first run). Toolchain set is version-pinned, fixed key suffices. Cache-hit runs skip the download.