[mateuszklysz]

Before: CI accepted code that only steers the compiler (x++; x--;, x = x;, a do { } while (0) outside a macro, if (0)) without any note, so readers could not tell a fakematch from real code.

After: the cleanup job fails a pull request that adds one of these shapes unless a comment that starts with Fakematch: ends at most three lines above it. Every existing case in src is now either marked or removed.

How:

• scripts/check-cleanup.py: new [fakematch] rule. It skips macro bodies and NON_MATCHING drafts, and only new cases fail, like the other rules. It comes with a test and a short section in docs/code-cleanup.md.
• Each existing case was compiled with and without the trick (game cc1 or SN, depending on the unit):
  • 57 if (0) branches in the hero files and setup_menu_display_text gave identical output, so they were dead code and are removed.
  • Four written-out library macros now use their names: EXTRACT_WORDS ×2, CHECK_INIT and DO_GLOBAL_CTORS_BODY.
  • The other 24 cases change the code, so they keep the trick and get a Fakematch: comment.
• Assembly for all 28 changed C files is identical to main.

[github-actions]

Decompilation progress

	C_EXACT	Change	Matched bytes	Functions	C_FUZZY
All code	90.09 %	—	3,196,488 / 3,548,100 B (—)	4,026 / 4,246 (—)	91.33 %
Boot executable	85.82 %	—	304,388 / 354,672 B (—)	1,179 / 1,232 (—)	98.24 %
Game	84.60 %	—	231,508 / 273,636 B (—)	874 / 912 (—)	98.46 %
SDK	89.94 %	—	72,880 / 81,036 B (—)	305 / 320 (—)	97.49 %
Level overlays	90.56 %	—	2,892,100 / 3,193,428 B (—)	2,847 / 3,014 (—)	90.56 %
Shared level code	83.19 %	—	940,484 / 1,130,492 B (—)	1,458 / 1,583 (—)	83.19 %
Per-level code	94.60 %	—	1,951,616 / 2,062,936 B (—)	1,389 / 1,431 (—)	94.60 %

	Data in C	Change	Matched bytes
All data	42.81 %	—	5,322,477 / 12,433,372 B (—)
Boot executable	2.29 %	—	16,042 / 699,136 B (—)
Level overlays	45.22 %	—	5,306,435 / 11,734,236 B (—)

No function changed its match state compared with main (606bc76).

_{Compared with main (606bc76). C_FUZZY uses main's last measurement.}