Hojun-Cho
befb042647
Test-speed "immediate wins" from task #19 (build/test-infra only, no compiler/cgen change — byte-id-neutral; all 237 pass, 950/990-997 + combined_ww_fresh unchanged). #1 Parallel build + ccache. MAKEFLAGS += -j$(NPROC) by default: the C-compile DAG and the five wwstage builds write disjoint outputs (each .o distinct; each wwstage tool's side files land at its own selfhost/cmd/<tool>/main.* stem), so -j is order-independent. test/run's Phase-2 byte-id gates are a single serial recipe that -j does not reach. CC is wrapped with ccache when present (content- addressed, byte-identical to plain cc); falls back to bare $(CC). #2 Kill 990's duplicate ww1->ww2 compile. probe_ww1_to_ww2 recompiled main.combined.ww (~70s) to assert the ww2 binary is executable — but probe_bootstrap_fixed_point already compiles ww1->ww2, assembles, links, and *runs* ww2 to produce ww3, so executability is proven and the byte-id assertions (ww2.s==ww3.s, ww2==ww3) are untouched. Drop the redundant probe. make test ~8:30 -> 7:39. Add `make smoke [FIXTURE=x.ww]`: inner-loop cross-stage byte-id check (cstage w6c vs wwstage w6c_ww .s diff) on a small self-contained fixture, seconds. Catches cs!=ww emission divergence per fold; NOT a substitute for the full 990-997 gate before landing a cgen/ABI fold.