Hojun-Cho c40edaa7f9 selfhost+test: gate wwstage w6c cgen on parser errors (#17) ...

Wwstage w6c_ww silently exited 0 on parse errors (stderr noise
only). The driver ran cgen on the broken AST then only checked
l.errs; ps.errs was never read, so callers downstream
(`ww build`, make rules) saw no signal and proceeded with junk
asm. Cstage cmd/w6c/main.c gates on `l.errs || p.errs` before
cgen; mirror that, hoisting the check above cgfile so the broken
AST never reaches codegen.

New test 742_parse_error pins the contract on both binaries:
writes a known-bad fragment to a pid-scoped /tmp file, runs cstage
w6c unconditionally and wwstage w6c_ww if available, asserts both
exit non-zero. Pre-fix wwstage exited 0 with junk asm; post-fix
exits 1 with parse: messages preserved on stderr.

116/116 ok. ww2 == ww3 == ww4 byte-id holds (no behavior change
for valid input).

2026-05-18 20:55:37 +09:00

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