add COMPATF2_NOACSARGCHECK to disable ACS function argument count checks

src/doomdef.h

@@ -242,6 +242,7 @@ enum : unsigned int
 	COMPATF2_NOMBF21		= 1 << 14,	// disable MBF21 features that may clash with certain maps
 	COMPATF2_VOODOO_ZOMBIES = 1 << 15,	// [RL0] allow playerinfo, playerpawn, and voodoo health to all be different, and skip killing the player's mobj if a voodoo doll dies to allow voodoo zombies
 	COMPATF2_FDTELEPORT		= 1 << 16,	// Emulate Final Doom's teleporter z glitch.
+	COMPATF2_NOACSARGCHECK	= 1 << 17,	// Disable arg count checking for ACS
 
 };
 

src/gamedata/g_mapinfo.cpp

@@ -1867,6 +1867,7 @@ MapFlagHandlers[] =
 	{ "compat_stayonlift",				MITYPE_COMPATFLAG, 0, COMPATF2_STAYONLIFT },
 	{ "compat_nombf21",					MITYPE_COMPATFLAG, 0, COMPATF2_NOMBF21 },
 	{ "compat_voodoozombies",			MITYPE_COMPATFLAG, 0, COMPATF2_VOODOO_ZOMBIES },
+	{ "compat_noacsargcheck",			MITYPE_COMPATFLAG, 0, COMPATF2_NOACSARGCHECK },
 	{ "cd_start_track",					MITYPE_EATNEXT,	0, 0 },
 	{ "cd_end1_track",					MITYPE_EATNEXT,	0, 0 },
 	{ "cd_end2_track",					MITYPE_EATNEXT,	0, 0 },

src/maploader/compatibility.cpp

@@ -174,6 +174,7 @@ static FCompatOption Options[] =
 	{ "nombf21",				COMPATF2_NOMBF21, SLOT_COMPAT2 },
 	{ "voodoozombies",			COMPATF2_VOODOO_ZOMBIES, SLOT_COMPAT2 },
 	{ "fdteleport",				COMPATF2_FDTELEPORT, SLOT_COMPAT2 },
+	{ "noacsargcheck",			COMPATF2_NOACSARGCHECK, SLOT_COMPAT2 },
 	{ NULL, 0, 0 }
 };
 

src/playsim/p_acs.cpp

@@ -5323,7 +5323,13 @@ int DLevelScript::SwapActorTeleFog(AActor *activator, int tid)
 }
 
 // Macro for CallFunction. Checks passed number of arguments with minimum required. Sets needCount and returns if not enough.
-#define MIN_ARG_COUNT(minCount) do { if (argCount < minCount) { needCount = minCount; return 0; } } while(0)
+#define MIN_ARG_COUNT(minCount) \
+	do { \
+		if (argCount < minCount && !(Level->i_compatflags2 & COMPATF2_NOACSARGCHECK)) { \
+			needCount = minCount; \
+			return 0; \
+		} \
+	} while(0)
 
 int DLevelScript::CallFunction(int argCount, int funcIndex, int32_t *args, int &needCount)
 {