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- ccache: enable depend mode (skip the preprocessor on ~75k compiler calls) and add BASEDIR/NOHASHDIR/SLOPPINESS as insurance against false misses from build-path or build-macro churn. ccache -s already shows 99.99% direct hits, so this trims per-call overhead, not a broken cache. MAXSIZE stays 8G (only ~1G used). - deps: drop dwarves + libdw-dev. pahole only runs with CONFIG_DEBUG_INFO_BTF, but the build forces DEBUG_INFO_NONE, so they were never used. - config: disable MODULE_COMPRESS/MODULE_DECOMPRESS for both arches. arm64 alone shipped zstd module compression, running a zstd pass over ~8000 .ko every build for no gain (the .deb is already compressed by KDEB_COMPRESS); x86_64 never did. Keeps the two arches in sync. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>