Hojun-Cho
218d8469ff
selfhost/cmd/6c/main.ww is a thin packaging of the wwc cgen — slurp a .ww file, run lex+parse+cgen, write Plan 9 amd64 asm to the path given by -o. The cgen routines in selfhost/cmd/wwc/cgen.ww write directly to fd 1, so we use dup2 to redirect stdout into the output file rather than thread an fd through every emit helper. Adds the SYS_DUP2=33 wrapper in lib/os. Makefile wires $(BIN)/6c_ww alongside the other wwstage tools and adds $(BIN)/test_6c_ww to the TESTS list. test/wwc/994_6c_ww.c diffs 6c_ww byte-for-byte against `wwdump_ww -c` on five in-source programs plus the four selfhost main.combined.ww files: same cgen reached through two binaries, so any divergence is a packaging bug in selfhost/cmd/6c. We deliberately don't diff against C-side 6c here — 990 probe 5 already covers that on the subset the ww cgen handles today.