Sync Makefile and common syms (#676)

src/AgbRfu_LinkManager.c

@@ -14,7 +14,7 @@
 #define FSP_ON    0x01
 #define FSP_START 0x02
 
-LINK_MANAGER lman;
+COMMON_DATA LINK_MANAGER lman = {0};
 
 static void rfu_LMAN_clearVariables(void);
 static void rfu_LMAN_settingPCSWITCH(u32 rand);

src/agb_flash.c

@@ -6,16 +6,16 @@ static u16 sTimerCount;
 static vu16 *sTimerReg;
 static u16 sSavedIme;
 
-u8 gFlashTimeoutFlag;
-u8 (*PollFlashStatus)(u8 *);
-u16 (*WaitForFlashWrite)(u8 phase, u8 *addr, u8 lastData);
-u16 (*ProgramFlashSector)(u16 sectorNum, void *src);
-const struct FlashType *gFlash;
-u16 (*ProgramFlashByte)(u16 sectorNum, u32 offset, u8 data);
-u16 gFlashNumRemainingBytes;
-u16 (*EraseFlashChip)();
-u16 (*EraseFlashSector)(u16 sectorNum);
-const u16 *gFlashMaxTime;
+COMMON_DATA u8 gFlashTimeoutFlag = 0;
+COMMON_DATA u8 (*PollFlashStatus)(u8 *) = NULL;
+COMMON_DATA u16 (*WaitForFlashWrite)(u8 phase, u8 *addr, u8 lastData) = NULL;
+COMMON_DATA u16 (*ProgramFlashSector)(u16 sectorNum, void *src) = NULL;
+COMMON_DATA const struct FlashType *gFlash = NULL;
+COMMON_DATA u16 (*ProgramFlashByte)(u16 sectorNum, u32 offset, u8 data) = NULL;
+COMMON_DATA u16 gFlashNumRemainingBytes = 0;
+COMMON_DATA u16 (*EraseFlashChip)() = NULL;
+COMMON_DATA u16 (*EraseFlashSector)(u16 sectorNum) = NULL;
+COMMON_DATA const u16 *gFlashMaxTime = NULL;
 
 void SetReadFlash1(u16 *dest);
 

src/battle_anim_special.c

@@ -30,9 +30,9 @@
 #define TAG_PARTICLES_LUXURYBALL  55030
 #define TAG_PARTICLES_PREMIERBALL 55031
 
-u32 gMonShrinkDuration;
-u16 gMonShrinkDelta;
-u16 gMonShrinkDistance;
+COMMON_DATA u32 gMonShrinkDuration = 0;
+COMMON_DATA u16 gMonShrinkDelta = 0;
+COMMON_DATA u16 gMonShrinkDistance = 0;
 
 static void AnimTask_UnusedLevelUpHealthBox_Step(u8);
 static void AnimTask_FlashHealthboxOnLevelUp_Step(u8);

src/battle_controller_pokedude.c

@@ -2424,7 +2424,7 @@ static const struct PokedudeBattlePartyInfo *const sPokedudeBattlePartyPointers[
     [TTVSCR_CATCHING] = sParties_Catching,
 };
 
-struct PokedudeBattlerState *gPokedudeBattlerStates[MAX_BATTLERS_COUNT];
+COMMON_DATA struct PokedudeBattlerState *gPokedudeBattlerStates[MAX_BATTLERS_COUNT] = {0};
 
 static void PokedudeSimulateInputChooseAction(void)
 {

src/battle_main.c

@@ -220,15 +220,15 @@ EWRAM_DATA u16 gBattleMovePower = 0;
 EWRAM_DATA u16 gMoveToLearn = 0;
 EWRAM_DATA u8 gBattleMonForms[MAX_BATTLERS_COUNT] = {0};
 
-void (*gPreBattleCallback1)(void);
-void (*gBattleMainFunc)(void);
-struct BattleResults gBattleResults;
-u8 gLeveledUpInBattle;
-void (*gBattlerControllerFuncs[MAX_BATTLERS_COUNT])(void);
-u8 gHealthboxSpriteIds[MAX_BATTLERS_COUNT];
-u8 gMultiUsePlayerCursor;
-u8 gNumberOfMovesToChoose;
-u8 gBattleControllerData[MAX_BATTLERS_COUNT];
+COMMON_DATA void (*gPreBattleCallback1)(void) = NULL;
+COMMON_DATA void (*gBattleMainFunc)(void) = NULL;
+COMMON_DATA struct BattleResults gBattleResults = {0};
+COMMON_DATA u8 gLeveledUpInBattle = 0;
+COMMON_DATA void (*gBattlerControllerFuncs[MAX_BATTLERS_COUNT])(void) = {0};
+COMMON_DATA u8 gHealthboxSpriteIds[MAX_BATTLERS_COUNT] = {0};
+COMMON_DATA u8 gMultiUsePlayerCursor = 0;
+COMMON_DATA u8 gNumberOfMovesToChoose = 0;
+COMMON_DATA u8 gBattleControllerData[MAX_BATTLERS_COUNT] = {0};
 
 static const struct ScanlineEffectParams sIntroScanlineParams16Bit =
 {

src/berry_fix_program.c

@@ -32,10 +32,10 @@ enum {
     STATE_RETRY,
 };
 
-const void *gMultibootStart;
-int gMultibootStatus;
-size_t gMultibootSize;
-struct MultiBootParam gMultibootParam;
+COMMON_DATA const void *gMultibootStart = NULL;
+COMMON_DATA int gMultibootStatus = 0;
+COMMON_DATA size_t gMultibootSize = 0;
+COMMON_DATA struct MultiBootParam gMultibootParam = {0};
 
 static void CB2_BerryFix(void);
 static void Task_BerryFixMain(u8 taskId);

src/bg.c

@@ -43,7 +43,7 @@ static struct BgConfig2 sGpuBgConfigs2[4];
 static u32 sDmaBusyBitfield[4];
 static u8 gpu_tile_allocation_map_bg[0x100];
 
-bool32 gWindowTileAutoAllocEnabled;
+COMMON_DATA bool32 gWindowTileAutoAllocEnabled = 0;
 
 static const struct BgConfig sZeroedBgControlStruct = { 0 };
 

src/cable_club.c

@@ -27,7 +27,7 @@
 #include "constants/field_weather.h"
 #include "constants/maps.h"
 
-u32 UnusedVarNeededToMatch[8];
+COMMON_DATA u32 UnusedVarNeededToMatch[8] = {0};
 
 static void Task_LinkupStart(u8 taskId);
 static void Task_LinkupAwaitConnection(u8 taskId);

src/ereader_screen.c

@@ -41,7 +41,7 @@ struct EReaderData
 
 static void Task_EReader(u8);
 
-struct EReaderData gEReaderData;
+COMMON_DATA struct EReaderData gEReaderData = {0};
 
 extern const u8 gMultiBootProgram_EReader_Start[];
 extern const u8 gMultiBootProgram_EReader_End[];

src/event_data.c

@@ -35,7 +35,7 @@ EWRAM_DATA u16 gSpecialVar_PrevTextColor = 0;
 EWRAM_DATA u16 gSpecialVar_0x8014 = 0;
 EWRAM_DATA u8 sSpecialFlags[SPECIAL_FLAGS_SIZE] = {};
 
-u16 gLastQuestLogStoredFlagOrVarIdx;
+COMMON_DATA u16 gLastQuestLogStoredFlagOrVarIdx = 0;
 
 extern u16 *const gSpecialVars[];
 

src/evolution_scene.c

@@ -43,7 +43,7 @@ static EWRAM_DATA struct EvoInfo *sEvoStructPtr = NULL;
 static EWRAM_DATA u16 *sBgAnimPal = NULL;
 
 // IWRAM common
-void (*gCB2_AfterEvolution)(void);
+COMMON_DATA void (*gCB2_AfterEvolution)(void) = NULL;
 
 #define sEvoCursorPos           gBattleCommunication[1] // when learning a new move
 #define sEvoGraphicsTaskId      gBattleCommunication[2]

src/fame_checker.c

@@ -57,8 +57,8 @@ static EWRAM_DATA struct FameCheckerData * sFameCheckerData = NULL;
 static EWRAM_DATA struct ListMenuItem * sListMenuItems = NULL;
 static EWRAM_DATA s32 sLastMenuIdx = 0;
 
-struct ListMenuTemplate gFameChecker_ListMenuTemplate;
-u8 gIconDescriptionBoxIsOpen;
+COMMON_DATA struct ListMenuTemplate gFameChecker_ListMenuTemplate = {0};
+COMMON_DATA u8 gIconDescriptionBoxIsOpen = 0;
 
 static void MainCB2_LoadFameChecker(void);
 static void LoadUISpriteSheetsAndPalettes(void);

src/field_camera.c

@@ -37,9 +37,9 @@ static s16 sVerticalCameraPan;
 static u8 sBikeCameraPanFlag;
 static void (*sFieldCameraPanningCallback)(void);
 
-struct CameraObject gFieldCamera;
-u16 gTotalCameraPixelOffsetY;
-u16 gTotalCameraPixelOffsetX;
+COMMON_DATA struct CameraObject gFieldCamera = {0};
+COMMON_DATA u16 gTotalCameraPixelOffsetY = 0;
+COMMON_DATA u16 gTotalCameraPixelOffsetX = 0;
 
 // text
 static void move_tilemap_camera_to_upper_left_corner_(struct FieldCameraOffset *cameraOffset)

src/field_control_avatar.c

@@ -71,7 +71,7 @@ static bool8 TryDoorWarp(struct MapPosition * position, u16 metatileBehavior, u8
 static s8 GetWarpEventAtPosition(struct MapHeader * mapHeader, u16 x, u16 y, u8 z);
 static const u8 *GetCoordEventScriptAtPosition(struct MapHeader * mapHeader, u16 x, u16 y, u8 z);
 
-struct FieldInput gFieldInputRecord;
+COMMON_DATA struct FieldInput gFieldInputRecord = {0};
 
 void FieldClearPlayerInput(struct FieldInput *input)
 {

src/field_specials.c

@@ -50,8 +50,8 @@ static EWRAM_DATA u16 sListMenuLastScrollPosition = 0;
 static EWRAM_DATA u8 sPCBoxToSendMon = 0;
 static EWRAM_DATA u8 sBrailleTextCursorSpriteID = 0;
 
-struct ListMenuTemplate sFieldSpecialsListMenuTemplate;
-u16 sFieldSpecialsListMenuScrollBuffer;
+COMMON_DATA struct ListMenuTemplate sFieldSpecialsListMenuTemplate = {0};
+COMMON_DATA u16 sFieldSpecialsListMenuScrollBuffer = 0;
 
 static void Task_AnimatePcTurnOn(u8 taskId);
 static void PcTurnOnUpdateMetatileId(bool16 flag);

src/fieldmap.c

@@ -14,7 +14,7 @@ struct ConnectionFlags
     u8 east:1;
 };
 
-struct BackupMapLayout VMap;
+COMMON_DATA struct BackupMapLayout VMap = {0};
 EWRAM_DATA u16 gBackupMapData[VIRTUAL_MAP_SIZE] = {};
 EWRAM_DATA struct MapHeader gMapHeader = {};
 EWRAM_DATA struct Camera gCamera = {};

src/help_system.c

@@ -51,8 +51,8 @@ struct HelpSystemState
     u8 scrollSub;
 };
 
-struct HelpSystemState gHelpSystemState;
-u16 gHelpContextIdBackup;
+COMMON_DATA struct HelpSystemState gHelpSystemState = {0};
+COMMON_DATA u16 gHelpContextIdBackup = 0;
 
 static bool32 IsCurrentMapInArray(const u16 * mapIdxs);
 static void BuildMainTopicsListAndMoveToH00(struct HelpSystemListMenu * a0, struct ListMenuItem * a1);

src/help_system_util.c

@@ -10,7 +10,7 @@
 
 #define ZERO 0
 
-bool8 gHelpSystemEnabled;
+COMMON_DATA bool8 gHelpSystemEnabled = 0;
 
 struct HelpSystemVideoState
 {

src/image_processing_effects.c

@@ -2,16 +2,16 @@
 #include "image_processing_effects.h"
 
 // IWRAM common
-u8 gCanvasColumnStart;
-u16 (*gCanvasPixels)[][32];
-u8 gCanvasRowEnd;
-u8 gCanvasHeight;
-u8 gCanvasColumnEnd;
-u8 gCanvasRowStart;
-u8 gCanvasMonPersonality;
-u8 gCanvasWidth;
-u16 *gCanvasPalette;
-u16 gCanvasPaletteStart;
+COMMON_DATA u8 gCanvasColumnStart = 0;
+COMMON_DATA u16 (*gCanvasPixels)[][32] = {0};
+COMMON_DATA u8 gCanvasRowEnd = 0;
+COMMON_DATA u8 gCanvasHeight = 0;
+COMMON_DATA u8 gCanvasColumnEnd = 0;
+COMMON_DATA u8 gCanvasRowStart = 0;
+COMMON_DATA u8 gCanvasMonPersonality = 0;
+COMMON_DATA u8 gCanvasWidth = 0;
+COMMON_DATA u16 *gCanvasPalette = NULL;
+COMMON_DATA u16 gCanvasPaletteStart = 0;
 
 static void ApplyImageEffect_Pointillism(void);
 static void ApplyImageEffect_Blur(void);

src/librfu_rfu.c

@@ -68,11 +68,11 @@ static void rfu_STC_NI_receive_Sender(u8, u8, const struct RfuLocalStruct *, con
 static void rfu_STC_NI_initSlot_asRecvDataEntity(u8, struct NIComm *);
 static void rfu_STC_NI_initSlot_asRecvControllData(u8, struct NIComm *);
 
-struct RfuSlotStatusUNI *gRfuSlotStatusUNI[RFU_CHILD_MAX];
-struct RfuSlotStatusNI *gRfuSlotStatusNI[RFU_CHILD_MAX];
-struct RfuLinkStatus *gRfuLinkStatus;
-struct RfuStatic *gRfuStatic;
-struct RfuFixed *gRfuFixed;
+COMMON_DATA struct RfuSlotStatusUNI *gRfuSlotStatusUNI[RFU_CHILD_MAX] = {0};
+COMMON_DATA struct RfuSlotStatusNI *gRfuSlotStatusNI[RFU_CHILD_MAX] = {0};
+COMMON_DATA struct RfuLinkStatus *gRfuLinkStatus = NULL;
+COMMON_DATA struct RfuStatic *gRfuStatic = NULL;
+COMMON_DATA struct RfuFixed *gRfuFixed = NULL;
 
 static const struct LLSFStruct llsf_struct[2] = {
     [MODE_CHILD] = {

src/librfu_sio32id.c

@@ -15,7 +15,7 @@ struct RfuSIO32Id
     u16 lastId;
 };
 
-struct RfuSIO32Id gRfuSIO32Id;
+COMMON_DATA struct RfuSIO32Id gRfuSIO32Id = {0};
 
 static const u16 Sio32ConnectionData[] = { 0x494e, 0x544e, 0x4e45, 0x4f44 }; // NINTENDO
 static const char Sio32IDLib_Var[] = "Sio32ID_030820";

src/librfu_stwi.c

@@ -8,7 +8,7 @@ static void STWI_stop_timer(void);
 static s32 STWI_restart_Command(void);
 static s32 STWI_reset_ClockCounter(void);
 
-struct STWIStatus *gSTWIStatus;
+COMMON_DATA struct STWIStatus *gSTWIStatus = NULL;
 
 void STWI_init_all(struct RfuIntrStruct *interruptStruct, IntrFunc *interrupt, bool8 copyInterruptToRam)
 {

src/link.c

@@ -62,41 +62,41 @@ static u16 sRecvNonzeroCheck;
 static u8 sChecksumAvailable;
 static u8 sHandshakePlayerCount;
 
-u16 gLinkPartnersHeldKeys[6];
-u32 gLinkDebugSeed;
-struct LinkPlayerBlock gLocalLinkPlayerBlock;
-bool8 gLinkErrorOccurred;
-u32 gLinkDebugFlags;
-u32 gLinkFiller1;
-bool8 gRemoteLinkPlayersNotReceived[MAX_LINK_PLAYERS];
-u8 gBlockReceivedStatus[MAX_LINK_PLAYERS];
-u32 gLinkFiller2;
-u16 gLinkHeldKeys;
-u16 gRecvCmds[MAX_RFU_PLAYERS][CMD_LENGTH];
-u32 gLinkStatus;
-bool8 gLinkDummy1; // Never read
-bool8 gLinkDummy2; // Never read
-bool8 gReadyToExitStandby[MAX_LINK_PLAYERS];
-bool8 gReadyToCloseLink[MAX_LINK_PLAYERS];
-u16 gReadyCloseLinkType;
-u8 gSuppressLinkErrorMessage;
-u8 gWirelessCommType;
-u8 gSavedLinkPlayerCount;
-u16 gSendCmd[CMD_LENGTH];
-u8 gSavedMultiplayerId;
-bool8 gReceivedRemoteLinkPlayers;
-struct LinkTestBGInfo gLinkTestBGInfo;
-void (*gLinkCallback)(void);
-u8 gShouldAdvanceLinkState;
-u16 gLinkTestBlockChecksums[MAX_LINK_PLAYERS];
-u8 gBlockRequestType;
-u32 gLinkFiller3; // file
-u32 gLinkFiller4; // boundary
-u32 gLinkFiller5; // here?
-u8 gLastSendQueueCount;
-struct Link gLink;
-u8 gLastRecvQueueCount;
-u16 gLinkSavedIme;
+COMMON_DATA u16 gLinkPartnersHeldKeys[6] = {0};
+COMMON_DATA u32 gLinkDebugSeed = 0;
+COMMON_DATA struct LinkPlayerBlock gLocalLinkPlayerBlock = {0};
+COMMON_DATA bool8 gLinkErrorOccurred = 0;
+COMMON_DATA u32 gLinkDebugFlags = 0;
+COMMON_DATA u32 gLinkFiller1 = 0;
+COMMON_DATA bool8 gRemoteLinkPlayersNotReceived[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u8 gBlockReceivedStatus[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u32 gLinkFiller2 = 0;
+COMMON_DATA u16 gLinkHeldKeys = 0;
+COMMON_DATA u16 gRecvCmds[MAX_RFU_PLAYERS][CMD_LENGTH] = {0};
+COMMON_DATA u32 gLinkStatus = 0;
+COMMON_DATA bool8 gLinkDummy1 = 0; // Never read
+COMMON_DATA bool8 gLinkDummy2 = 0; // Never read
+COMMON_DATA bool8 gReadyToExitStandby[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA bool8 gReadyToCloseLink[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u16 gReadyCloseLinkType = 0;
+COMMON_DATA u8 gSuppressLinkErrorMessage = 0;
+COMMON_DATA u8 gWirelessCommType = 0;
+COMMON_DATA u8 gSavedLinkPlayerCount = 0;
+COMMON_DATA u16 gSendCmd[CMD_LENGTH] = {0};
+COMMON_DATA u8 gSavedMultiplayerId = 0;
+COMMON_DATA bool8 gReceivedRemoteLinkPlayers = 0;
+COMMON_DATA struct LinkTestBGInfo gLinkTestBGInfo = {0};
+COMMON_DATA void (*gLinkCallback)(void) = NULL;
+COMMON_DATA u8 gShouldAdvanceLinkState = 0;
+COMMON_DATA u16 gLinkTestBlockChecksums[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u8 gBlockRequestType = 0;
+COMMON_DATA u32 gLinkFiller3 = 0; // file
+COMMON_DATA u32 gLinkFiller4 = 0; // boundary
+COMMON_DATA u32 gLinkFiller5 = 0; // here?
+COMMON_DATA u8 gLastSendQueueCount = 0;
+COMMON_DATA struct Link gLink = {0};
+COMMON_DATA u8 gLastRecvQueueCount = 0;
+COMMON_DATA u16 gLinkSavedIme = 0;
 
 static EWRAM_DATA bool8 sLinkTestDebugValuesEnabled = FALSE;
 static EWRAM_DATA bool8 sDummyFlag = FALSE;

src/link_rfu_2.c

@@ -75,9 +75,9 @@ static u32 sRfuAPIBuffer[RFU_API_BUFF_SIZE_RAM / 4];
 static u8 sResendBlock8[CMD_LENGTH * 2];
 static u16 sResendBlock16[CMD_LENGTH];
 
-struct RfuGameData gHostRfuGameData;
-struct RfuManager gRfu;
-u8 gHostRfuUsername[PLAYER_NAME_LENGTH + 1];
+COMMON_DATA struct RfuGameData gHostRfuGameData = {0};
+COMMON_DATA struct RfuManager gRfu = {0};
+COMMON_DATA u8 gHostRfuUsername[PLAYER_NAME_LENGTH + 1] = {0};
 
 static void InitChildRecvBuffers(void);
 static void InitParentSendData(void);

src/list_menu.c

@@ -39,8 +39,8 @@ struct MoveMenuInfoIcon
 
 static EWRAM_DATA struct MysteryGiftLinkMenuStruct sMysteryGiftLinkMenu = {0};
 
-struct ListMenuOverride gListMenuOverride;
-struct ListMenuTemplate gMultiuseListMenuTemplate;
+COMMON_DATA struct ListMenuOverride gListMenuOverride = {0};
+COMMON_DATA struct ListMenuTemplate gMultiuseListMenuTemplate = {0};
 
 static u8 ListMenuInitInternal(const struct ListMenuTemplate *listMenuTemplate, u16 cursorPos, u16 itemsAbove);
 static bool8 ListMenuChangeSelection(struct ListMenu *list, bool8 updateCursorAndCallCallback, u8 count, bool8 movingDown);

src/load_save.c

@@ -37,10 +37,10 @@ EWRAM_DATA struct LoadedSaveData gLoadedSaveData = {0};
 EWRAM_DATA u32 gLastEncryptionKey = 0;
 
 // IWRAM common
-bool32 gFlashMemoryPresent;
-struct SaveBlock1 *gSaveBlock1Ptr;
-struct SaveBlock2 *gSaveBlock2Ptr;
-struct PokemonStorage *gPokemonStoragePtr;
+COMMON_DATA bool32 gFlashMemoryPresent = 0;
+COMMON_DATA struct SaveBlock1 *gSaveBlock1Ptr = NULL;
+COMMON_DATA struct SaveBlock2 *gSaveBlock2Ptr = NULL;
+COMMON_DATA struct PokemonStorage *gPokemonStoragePtr = NULL;
 
 void CheckForFlashMemory(void)
 {

src/m4a.c

@@ -7,18 +7,18 @@ extern const u8 gCgb3Vol[];
 
 BSS_CODE ALIGNED(4) char SoundMainRAM_Buffer[0x800] = {0};
 
-struct SoundInfo gSoundInfo;
-struct PokemonCrySong gPokemonCrySongs[MAX_POKEMON_CRIES];
-struct MusicPlayerInfo gPokemonCryMusicPlayers[MAX_POKEMON_CRIES];
-MPlayFunc gMPlayJumpTable[36];
-struct CgbChannel gCgbChans[4];
-struct MusicPlayerTrack gPokemonCryTracks[MAX_POKEMON_CRIES * 2];
-struct PokemonCrySong gPokemonCrySong;
-struct MusicPlayerInfo gMPlayInfo_BGM;
-struct MusicPlayerInfo gMPlayInfo_SE1;
-struct MusicPlayerInfo gMPlayInfo_SE2;
-struct MusicPlayerInfo gMPlayInfo_SE3;
-u8 gMPlayMemAccArea[0x10];
+COMMON_DATA struct SoundInfo gSoundInfo = {0};
+COMMON_DATA struct PokemonCrySong gPokemonCrySongs[MAX_POKEMON_CRIES] = {0};
+COMMON_DATA struct MusicPlayerInfo gPokemonCryMusicPlayers[MAX_POKEMON_CRIES] = {0};
+COMMON_DATA MPlayFunc gMPlayJumpTable[36] = {0};
+COMMON_DATA struct CgbChannel gCgbChans[4] = {0};
+COMMON_DATA struct MusicPlayerTrack gPokemonCryTracks[MAX_POKEMON_CRIES * 2] = {0};
+COMMON_DATA struct PokemonCrySong gPokemonCrySong = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_BGM = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_SE1 = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_SE2 = {0};
+COMMON_DATA u8 gMPlayMemAccArea[0x10] = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_SE3 = {0};
 
 u32 MidiKeyToFreq(struct WaveData *wav, u8 key, u8 fineAdjust)
 {

src/main.c

@@ -58,21 +58,18 @@ const IntrFunc gIntrTableTemplate[] =
 
 #define INTR_COUNT ((int)(sizeof(gIntrTableTemplate)/sizeof(IntrFunc)))
 
-u16 gKeyRepeatStartDelay;
-u8 gLinkTransferringData;
-struct Main gMain;
-u16 gKeyRepeatContinueDelay;
-u8 gSoftResetDisabled;
-IntrFunc gIntrTable[INTR_COUNT];
-bool8 gLinkVSyncDisabled;
-u32 IntrMain_Buffer[0x200];
-u8 gPcmDmaCounter;
-
-// These variables are not defined in RS or Emerald, and are never read.
-// They were likely used to debug the audio engine and VCount interrupt.
-u8 sVcountAfterSound;
-u8 sVcountAtIntr;
-u8 sVcountBeforeSound;
+COMMON_DATA u16 gKeyRepeatStartDelay = 0;
+COMMON_DATA u8 gLinkTransferringData = 0;
+COMMON_DATA struct Main gMain = {0};
+COMMON_DATA u16 gKeyRepeatContinueDelay = 0;
+COMMON_DATA u8 gSoftResetDisabled = 0;
+COMMON_DATA IntrFunc gIntrTable[INTR_COUNT] = {0};
+COMMON_DATA u8 sVcountAfterSound = 0;
+COMMON_DATA bool8 gLinkVSyncDisabled = 0;
+COMMON_DATA u32 IntrMain_Buffer[0x200] = {0};
+COMMON_DATA u8 sVcountAtIntr = 0;
+COMMON_DATA u8 sVcountBeforeSound = 0;
+COMMON_DATA u8 gPcmDmaCounter = 0;
 
 static IntrFunc * const sTimerIntrFunc = gIntrTable + 0x7;
 

src/overworld.c

@@ -106,14 +106,14 @@ static EWRAM_DATA s16 sCreditsOverworld_CmdIndex = 0;
 
 EWRAM_DATA struct LinkPlayerObjectEvent gLinkPlayerObjectEvents[4] = {};
 
-u16 *gBGTilemapBuffers1;
-u16 *gBGTilemapBuffers2;
-u16 *gBGTilemapBuffers3;
-void (*gFieldCallback)(void);
-bool8 (*gFieldCallback2)(void);
-u16 gHeldKeyCodeToSend;
-u8 gLocalLinkPlayerId;
-u8 gFieldLinkPlayerCount;
+COMMON_DATA u16 *gBGTilemapBuffers1 = NULL;
+COMMON_DATA u16 *gBGTilemapBuffers2 = NULL;
+COMMON_DATA u16 *gBGTilemapBuffers3 = NULL;
+COMMON_DATA void (*gFieldCallback)(void) = NULL;
+COMMON_DATA bool8 (*gFieldCallback2)(void) = NULL;
+COMMON_DATA u16 gHeldKeyCodeToSend = 0;
+COMMON_DATA u8 gLocalLinkPlayerId = 0;
+COMMON_DATA u8 gFieldLinkPlayerCount = 0;
 
 static u8 sPlayerLinkStates[MAX_LINK_PLAYERS];
 static KeyInterCB sPlayerKeyInterceptCallback;

src/party_menu.c

@@ -414,7 +414,7 @@ EWRAM_DATA u8 gSelectedOrderFromParty[3] = {0};
 static EWRAM_DATA u16 sPartyMenuItemId = ITEM_NONE;
 ALIGNED(4) EWRAM_DATA u8 gBattlePartyCurrentOrder[PARTY_SIZE / 2] = {0}; // bits 0-3 are the current pos of Slot 1, 4-7 are Slot 2, and so on
 
-void (*gItemUseCB)(u8, TaskFunc);
+COMMON_DATA void (*gItemUseCB)(u8, TaskFunc) = NULL;
 
 #include "data/pokemon/tutor_learnsets.h"
 #include "data/party_menu.h"

src/quest_log.c

@@ -67,10 +67,10 @@ struct FlagOrVarRecord
     u16 value;
 };
 
-u8 gQuestLogPlaybackState;
-u16 sMaxActionsInScene;
-struct FieldInput gQuestLogFieldInput;
-struct QuestLogAction * sCurSceneActions;
+COMMON_DATA u8 gQuestLogPlaybackState = 0;
+COMMON_DATA u16 sMaxActionsInScene = 0;
+COMMON_DATA struct FieldInput gQuestLogFieldInput = {0};
+COMMON_DATA struct QuestLogAction * sCurSceneActions = NULL;
 
 static struct FlagOrVarRecord * sFlagOrVarRecords;
 static u16 sNumFlagsOrVars;

src/random.c

@@ -4,7 +4,7 @@
 // The number 1103515245 comes from the example implementation
 // of rand and srand in the ISO C standard.
 
-u32 gRngValue;
+COMMON_DATA u32 gRngValue = 0;
 
 u16 Random(void)
 {

src/save.c

@@ -77,18 +77,18 @@ STATIC_ASSERT(sizeof(struct SaveBlock1) <= SECTOR_DATA_SIZE * (SECTOR_ID_SAVEBLO
 STATIC_ASSERT(sizeof(struct PokemonStorage) <= SECTOR_DATA_SIZE * (SECTOR_ID_PKMN_STORAGE_END - SECTOR_ID_PKMN_STORAGE_START + 1), PokemonStorageFreeSpace);
 
 // Sector num to begin writing save data. Sectors are rotated each time the game is saved. (possibly to avoid wear on flash memory?)
-u16 gLastWrittenSector;
-u32 gLastSaveCounter;
-u16 gLastKnownGoodSector;
-u32 gDamagedSaveSectors;
-u32 gSaveCounter;
-struct SaveSector *gSaveDataBufferPtr; // the pointer is in fast IWRAM but points to the slower EWRAM.
-u16 gIncrementalSectorId;
-u16 gSaveUnusedVar;
-u16 gSaveFileStatus;
-void (*gGameContinueCallback)(void);
-struct SaveSectorLocation gRamSaveSectorLocations[NUM_SECTORS_PER_SLOT];
-u16 gSaveAttemptStatus;
+COMMON_DATA u16 gLastWrittenSector = 0;
+COMMON_DATA u32 gLastSaveCounter = 0;
+COMMON_DATA u16 gLastKnownGoodSector = 0;
+COMMON_DATA u32 gDamagedSaveSectors = 0;
+COMMON_DATA u32 gSaveCounter = 0;
+COMMON_DATA struct SaveSector *gSaveDataBufferPtr = NULL; // the pointer is in fast IWRAM but points to the slower EWRAM.
+COMMON_DATA u16 gIncrementalSectorId = 0;
+COMMON_DATA u16 gSaveUnusedVar = 0;
+COMMON_DATA u16 gSaveFileStatus = 0;
+COMMON_DATA void (*gGameContinueCallback)(void) = NULL;
+COMMON_DATA struct SaveSectorLocation gRamSaveSectorLocations[NUM_SECTORS_PER_SLOT] = {0};
+COMMON_DATA u16 gSaveAttemptStatus = 0;
 
 EWRAM_DATA struct SaveSector gSaveDataBuffer = {0};
 EWRAM_DATA u32 gSaveUnusedVar2 = 0;

src/save_failed_screen.c

@@ -7,7 +7,7 @@
 #include "save.h"
 #include "strings.h"
 
-bool32 sIsInSaveFailedScreen;
+COMMON_DATA bool32 sIsInSaveFailedScreen = 0;
 
 static EWRAM_DATA u16 sSaveType = SAVE_NORMAL;
 static EWRAM_DATA u16 sUnused = 0;

src/scrcmd.c

@@ -54,8 +54,8 @@ static EWRAM_DATA u16 sMovingNpcMapGroup = 0;
 static EWRAM_DATA u16 sMovingNpcMapNum = 0;
 static EWRAM_DATA u16 sFieldEffectScriptId = 0;
 
-struct ScriptContext * sQuestLogScriptContextPtr;
-u8 gSelectedObjectEvent;
+COMMON_DATA struct ScriptContext * sQuestLogScriptContextPtr = NULL;
+COMMON_DATA u8 gSelectedObjectEvent = 0;
 
 // This is defined in here so the optimizer can't see its value when compiling
 // script.c.

src/sound.c

@@ -30,7 +30,7 @@ static u8 sMapMusicFadeInSpeed;
 static u16 sFanfareCounter;
 
 // iwram common
-bool8 gDisableMusic;
+COMMON_DATA bool8 gDisableMusic = 0;
 
 extern u32 gBattleTypeFlags;
 extern struct MusicPlayerInfo gMPlayInfo_BGM;

src/sprite.c

@@ -270,8 +270,8 @@ static u16 sSpriteTileRanges[MAX_SPRITES * 2];
 static struct AffineAnimState sAffineAnimStates[OAM_MATRIX_COUNT];
 static u16 sSpritePaletteTags[16];
 
-u32 gOamMatrixAllocBitmap;
-u8 gReservedSpritePaletteCount;
+COMMON_DATA u32 gOamMatrixAllocBitmap = 0;
+COMMON_DATA u8 gReservedSpritePaletteCount = 0;
 
 EWRAM_DATA struct Sprite gSprites[MAX_SPRITES + 1] = {0};
 EWRAM_DATA u16 gSpritePriorities[MAX_SPRITES] = {0};

src/task.c

@@ -4,7 +4,7 @@
 #define HEAD_SENTINEL 0xFE
 #define TAIL_SENTINEL 0xFF
 
-struct Task gTasks[NUM_TASKS];
+COMMON_DATA struct Task gTasks[NUM_TASKS] = {0};
 
 static void InsertTask(u8 newTaskId);
 static u8 FindFirstActiveTask();

src/text.c

@@ -24,7 +24,7 @@ static s32 GetGlyphWidth_Male(u16 glyphId, bool32 isJapanese);
 static s32 GetGlyphWidth_Female(u16 glyphId, bool32 isJapanese);
 static void SpriteCB_TextCursor(struct Sprite *sprite);
 
-TextFlags gTextFlags;
+COMMON_DATA TextFlags gTextFlags = {0};
 
 static const u8 sDownArrowTiles[]         = INCBIN_U8("graphics/fonts/down_arrow.4bpp");
 static const u8 sDarkDownArrowTiles[]     = INCBIN_U8("graphics/fonts/down_arrow_RS.4bpp");

src/text_printer.c

@@ -10,8 +10,8 @@ static u16 sLastTextBgColor;
 static u16 sLastTextFgColor;
 static u16 sLastTextShadowColor;
 
-const struct FontInfo *gFonts;
-struct GlyphInfo gGlyphInfo;
+COMMON_DATA const struct FontInfo *gFonts = NULL;
+COMMON_DATA struct GlyphInfo gGlyphInfo = {0};
 
 static const u8 sFontHalfRowOffsets[] =
 {

src/window.c

@@ -1,8 +1,8 @@
 #include "global.h"
 #include "gflib.h"
 
-u8 gWindowClearTile;
-void *gWindowBgTilemapBuffers[4];
+COMMON_DATA u8 gWindowClearTile = {0};
+COMMON_DATA void *gWindowBgTilemapBuffers[4] = {0};
 
 EWRAM_DATA struct Window gWindows[WINDOWS_MAX] = {0};