diff --git a/src/data_win.c b/src/data_win.c
index 5809e0a6..8177121e 100644
--- a/src/data_win.c
+++ b/src/data_win.c
@@ -1414,7 +1414,7 @@ static void readRoomBackgrounds(BinaryReader* reader, Room* room) {
     free(bgPtrs);
 }
 
-static void readRoomViews(BinaryReader* reader, DataWin* dw, Room* room) {
+static void readRoomViews(BinaryReader* reader, Room* room) {
     uint32_t viewCount;
     uint32_t* viewPtrsArr = readPointerTable(reader, &viewCount);
     room->views = safeMalloc(8 * sizeof(RoomView));
@@ -1726,7 +1726,7 @@ static void readRoomPayload(BinaryReader* reader, DataWin* dw, Room* room) {
     readRoomBackgrounds(reader, room);
 
     BinaryReader_seek(reader, room->viewsFileOffset);
-    readRoomViews(reader, dw, room);
+    readRoomViews(reader, room);
 
     BinaryReader_seek(reader, room->gameObjectsFileOffset);
     readRoomGameObjects(reader, dw, room);
diff --git a/src/desktop/main.c b/src/desktop/main.c
index da061ab2..324660a7 100644
--- a/src/desktop/main.c
+++ b/src/desktop/main.c
@@ -764,7 +764,8 @@ static PreviousSignalActionEntry* previousSignalActions = nullptr;
 static void onCrashSignal(int sig) {
     saveInputRecording();
     // Restore the previous handler (ASAN) and re-raise so it can report the fault
-    sigaction(sig, &previousSignalActions[hmgeti(previousSignalActions, sig)].value, nullptr);
+    ssize_t idx = hmgeti(previousSignalActions, sig);
+    sigaction(sig, &previousSignalActions[idx].value, nullptr);
     raise(sig);
 }
 #endif
diff --git a/src/gl/gl_renderer.c b/src/gl/gl_renderer.c
index 4b38798c..32220a69 100644
--- a/src/gl/gl_renderer.c
+++ b/src/gl/gl_renderer.c
@@ -820,7 +820,6 @@ static void glDrawTriangle(Renderer *renderer, float x1, float y1, float x2, flo
 
         flushBatch(gl);
 
-        int i = 0;
         float verts[24] = {
             x1, y1, 0.0f, 0.0f, r, g, b, renderer->drawAlpha,
             x2, y2, 0.0f, 0.0f, r, g, b, renderer->drawAlpha,
diff --git a/src/runner.c b/src/runner.c
index e74906af..5d665a92 100644
--- a/src/runner.c
+++ b/src/runner.c
@@ -2369,7 +2369,7 @@ static void dispatchCollisionEvents(Runner* runner) {
                     if (needsPrecise) {
                         bool preciseHit = Collision_instancesOverlapPrecise(runner, self, other, bboxSelf, bboxOther);
 #ifdef ENABLE_VM_TRACING
-                        if (traceThisPair) fprintf(stderr, "  precise=%s (selfSepMasks=%d otherSepMasks=%d)\n", preciseHit ? "hit" : "miss", sprSelf ? sprSelf->sepMasks : -1, sprOther ? sprOther->sepMasks : -1);
+                        if (traceThisPair) fprintf(stderr, "  precise=%s (selfSepMasks=%d otherSepMasks=%d)\n", preciseHit ? "hit" : "miss", sprSelf ? (int32_t)sprSelf->sepMasks : -1, sprOther ? (int32_t)sprOther->sepMasks : -1);
 #endif
                         if (!preciseHit) continue;
                     }
@@ -2551,7 +2551,6 @@ static void updateViews(Runner* runner) {
 }
 
 static void dispatchOutsideRoomEvents(Runner* runner) {
-    DataWin* dataWin = runner->dataWin;
     int32_t outsideSlot = EventSlotMap_lookup(&runner->eventSlotMap, EVENT_OTHER, OTHER_OUTSIDE_ROOM);
     if (0 > outsideSlot) return;
     ResolvedEventTable* table = &runner->eventTable;
diff --git a/src/vm.c b/src/vm.c
index fcf41463..78a4691f 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -424,16 +424,6 @@ static ArrayAccess popArrayAccess(VMContext* ctx, uint32_t varRef) {
 }
 
 // ===[ Variable Resolution ]===
-static const char* instanceTypeName(int32_t instanceType) {
-    switch (instanceType) {
-        case INSTANCE_SELF: return "self";
-        case INSTANCE_OTHER: return "other";
-        case INSTANCE_GLOBAL: return "global";
-        case INSTANCE_LOCAL: return "local";
-        case INSTANCE_ARG: return "arg";
-        default: return "instance";
-    }
-}
 
 // Returns the object name for an instance, or "<global_scope>" for the global scope dummy instance
 static const char* instanceObjectName(VMContext* ctx, Instance* inst) {
diff --git a/src/vm_builtins.c b/src/vm_builtins.c
index af3c5e75..4837550d 100644
--- a/src/vm_builtins.c
+++ b/src/vm_builtins.c
@@ -167,24 +167,6 @@ static DsQueue* dsQueueGet(Runner* runner, int32_t id) {
 
 // ===[ BUILT-IN VARIABLE GET/SET ]===
 
-/**
- * Gets the argument number from the name
- *
- * If it returns -1, then the name is not an argument variable
- *
- * @param name The name
- * @return The argument number, -1 if it is not an argument variable
- */
-static int extractArgumentNumber(const char* name) {
-    if (strncmp(name, "argument", 8) == 0) {
-        char* end;
-        long argNumber = strtol(name + 8, &end, 10);
-        if (end == name + 8 || *end != '\0' || 0 > argNumber || argNumber > 15) return -1;
-        return (int) argNumber;
-    }
-    return -1;
-}
-
 static bool isValidAlarmIndex(int alarmIndex) {
     return alarmIndex >= 0 && GML_ALARM_COUNT > alarmIndex;
 }
@@ -2157,8 +2139,8 @@ static RValue builtin_string_replace(MAYBE_UNUSED VMContext* ctx, RValue* args,
     int32_t before = (int32_t) (appearance - str);
     char *outputString = safeMalloc(newLen + 1);
 
-    strncpy(outputString, str, before);
-    strncpy(outputString + before, replacement, replacementLen);
+    memcpy(outputString, str, before);
+    memcpy(outputString + before, replacement, replacementLen);
     strcpy(outputString + before + replacementLen, appearance + needleLen);
 
     free(str);
@@ -2852,7 +2834,6 @@ static RValue builtin_room_get_info(VMContext* ctx, RValue* args, int32_t argCou
             VM_structSet(ctx, ls, "visible", RValue_makeBool(lay->visible));
 
             if (wantLayerEls) {
-                int32_t elemCount = 0;
                 GMLArray* elements = nullptr;
                 switch ((RoomLayerType) lay->type) {
                     case RoomLayerType_Background: {
@@ -2873,7 +2854,6 @@ static RValue builtin_room_get_info(VMContext* ctx, RValue* args, int32_t argCou
                             VM_structSet(ctx, es, "speed_type", RValue_makeInt32((int32_t) bg->animSpeedType));
                         }
                         *GMLArray_slot(elements, 0) = RValue_makeStructAndIncRef(es);
-                        elemCount = 1;
                         break;
                     }
                     case RoomLayerType_Instances: {
@@ -2887,7 +2867,6 @@ static RValue builtin_room_get_info(VMContext* ctx, RValue* args, int32_t argCou
                             VM_structSet(ctx, es, "inst_id", RValue_makeInt32((int32_t) id->instanceIds[j]));
                             *GMLArray_slot(elements, j) = RValue_makeStructAndIncRef(es);
                         }
-                        elemCount = ic;
                         break;
                     }
                     case RoomLayerType_Tiles: {
@@ -2913,13 +2892,11 @@ static RValue builtin_room_get_info(VMContext* ctx, RValue* args, int32_t argCou
                             }
                         }
                         *GMLArray_slot(elements, 0) = RValue_makeStructAndIncRef(es);
-                        elemCount = 1;
                         break;
                     }
                     default:
                         // Asset/Path/Effect layers: emit an empty element list. Filling these out matches the HTML5 runner but isn't required for room_goto navigation.
                         elements = GMLArray_create(1);
-                        elemCount = 0;
                         break;
                 }
                 if (elements != nullptr) VM_structSet(ctx, ls, "elements", RValue_makeArray(elements));
@@ -7695,7 +7672,7 @@ static RValue builtin_buffer_base64_decode(MAYBE_UNUSED VMContext* ctx, RValue*
     unsigned int inLen = (unsigned int) strlen(input);
     size_t outLen = BASE64_DECODE_OUT_SIZE(inLen);
     uint8_t* out = safeMalloc(outLen);
-    base64_decode((const unsigned char*) input, inLen, out);
+    base64_decode(input, inLen, out);
     free(input);
     int32_t id = gmlBufferCreate(runner, outLen, GML_BUFFER_GROW, 1);
     GmlBuffer* buf = gmlBufferGet(runner, id);
@@ -7747,7 +7724,6 @@ static RValue builtin_buffer_md5(MAYBE_UNUSED VMContext* ctx, RValue* args, MAYB
     MD5Final(digest, &mctx);
 
     char* hex = safeMalloc(33);
-    static const char HEX[] = "0123456789abcdef";
     for (int32_t i = 0; 16 > i; i++) {
         sprintf(&hex[i * 2], "%02x", digest[i]);
     }
@@ -8005,9 +7981,6 @@ static RValue builtin_draw_sprite_general(VMContext* ctx, RValue* args, MAYBE_UN
     float yscale = (float) RValue_toReal(args[9]);
     float rot = (float) RValue_toReal(args[10]);
     uint32_t c1 = (uint32_t) RValue_toInt32(args[11]);
-    uint32_t c2 = (uint32_t) RValue_toInt32(args[12]);
-    uint32_t c3 = (uint32_t) RValue_toInt32(args[13]);
-    uint32_t c4 = (uint32_t) RValue_toInt32(args[14]);
     float alpha = (float) RValue_toReal(args[15]);
 
     if (0 > subimg && ctx->currentInstance != nullptr) {
@@ -8094,8 +8067,6 @@ static RValue builtin_draw_healthbar(VMContext* ctx, RValue* args, MAYBE_UNUSED
     uint32_t maxCol = (uint32_t) RValue_toInt32(args[7]);
     uint32_t intermediateColor = (uint32_t) Color_lerp((int32_t) minCol, (int32_t) maxCol, amount);
 
-    int32_t direction = RValue_toInt32(args[8]);
-
     bool showBack = RValue_toBool(args[9]);
 
     if (showBack) {
@@ -12004,7 +11975,8 @@ static RValue builtin_mp_grid_add_rectangle(VMContext* ctx, RValue* args, int32_
     int32_t y1 = RValue_toInt32(args[2]);
     int32_t x2 = RValue_toInt32(args[3]);
     int32_t y2 = RValue_toInt32(args[4]);
-    if (x1 < 0) x1 = 0; if (y1 < 0) y1 = 0;
+    if (x1 < 0) x1 = 0;
+    if (y1 < 0) y1 = 0;
     if (x2 >= g->hcells) x2 = g->hcells - 1;
     if (y2 >= g->vcells) y2 = g->vcells - 1;
     for (int32_t cx = x1; x2 >= cx; cx++) {
@@ -12024,7 +11996,8 @@ static RValue builtin_mp_grid_clear_rectangle(VMContext* ctx, RValue* args, int3
     int32_t y1 = RValue_toInt32(args[2]);
     int32_t x2 = RValue_toInt32(args[3]);
     int32_t y2 = RValue_toInt32(args[4]);
-    if (x1 < 0) x1 = 0; if (y1 < 0) y1 = 0;
+    if (x1 < 0) x1 = 0;
+    if (y1 < 0) y1 = 0;
     if (x2 >= g->hcells) x2 = g->hcells - 1;
     if (y2 >= g->vcells) y2 = g->vcells - 1;
     for (int32_t cx = x1; x2 >= cx; cx++) {
@@ -12713,7 +12686,6 @@ static RValue builtin_asset_get_index(VMContext* ctx, RValue* args, int32_t argC
     }
 
     char* name = RValue_toString(args[0]);
-    DataWin* dw = ctx->dataWin;
 
     int32_t value = shget(ctx->runner->assetsByName, name);
     free(name);