Hojun-Cho 7b36f961a9 wcc/ww: out/.pkgcache content-keyed package cache for --sep (M3-tail c5b, #63) ...

Per-package build cache for `ww build --sep`: before recompiling a
package, recompute a plain-text key manifest (md5sum-hex lines of the
package sources, each direct dep's .wwi, the w6c and w6a binaries, plus
the compile flags) and reuse the cached .o/.wwi on a byte-for-byte key
hit. Both stages shell the same host md5sum (no ww-side md5) so the
non-compiler key lines are byte-identical cstage==wwstage; the compiler
md5 lines differ per stage BY DESIGN, giving each stage its own cache
namespace so a hit can never reuse the other stage's .o and mask a
cs!=ww codegen divergence. Cached outputs (.o/.wwi) stay byte-identical
across stages. Root package never cached; cache lives under $(OUT)
(gitignored, wiped by make clean). Both stages mirrored.

Dev-only convenience, off every bootstrap/byte-id gate. Gate
989_pkgcache_run (cold) proves miss-compiles / hit-skips-byte-id /
independent key-bust per input class with non-vacuity rehit.

2026-06-16 15:35:26 +09:00

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