Some GCC compilation fixes (#3114)

* Fix 6-byte multichar literals

* Add `struct` to `e_ga_class::ga_s`

* Fix remaining wrong forward declares (struct/class)

* Replace `#include <string>` with `#include <cstring>`

* Guard FLT_EPSILON define to prevent redefinition

* Add missing `#include <cstring>` for direct cstring function usage

include/d/actor/d_a_e_ga.h

@@ -34,7 +34,7 @@ public:
     /* 0x0570 */ u8 prm0;
     /* 0x0571 */ u8 prm1;
     /* 0x0572 */ u8 prm2;
-    /* 0x0574 */ ga_s ga_s[256];
+    /* 0x0574 */ struct ga_s ga_s[256];
     /* 0x4D74 */ int ga_num;
     /* 0x4D78 */ u8 HIOInit;
     /* 0x4D79 */ u8 initialized;

include/d/actor/d_a_e_pm.h

@@ -9,7 +9,7 @@
 #include "d/d_cc_uty.h"
 #include "d/d_msg_flow.h"
 
-class dPath;
+struct dPath;
 
 /**
  * @ingroup actors-enemies

include/d/actor/d_a_npc.h

@@ -10,6 +10,7 @@
 #include "d/d_msg_flow.h"
 #include "d/d_particle_copoly.h"
 #include "global.h"
+#include <cstring>
 
 struct daNpc_GetParam1 {  // name unknown
     /* 0x0 */ int fileIdx;

include/d/actor/d_a_npc_bou.h

@@ -2,6 +2,7 @@
 #define D_A_NPC_BOU_H
 
 #include "d/actor/d_a_npc.h"
+#include <cstring>
 
 struct daNpc_Bou_HIOParam {
     /* 0x00 */ daNpcT_HIOParam common;

include/d/actor/d_a_npc_cdn3.h

@@ -4,6 +4,7 @@
 #include "d/actor/d_a_npc.h"
 #include "d/actor/d_a_npc_cd2.h"
 #include "d/actor/d_a_tag_schedule.h"
+#include <cstring>
 
 /**
  * @ingroup actors-npcs

include/d/actor/d_a_npc_kn.h

@@ -2,6 +2,7 @@
 #define D_A_NPC_KN_H
 
 #include "d/actor/d_a_npc.h"
+#include <cstring>
 
 struct daNpc_Kn_HIOParam {
     /* 0x00 */ daNpcT_HIOParam common;

include/d/actor/d_a_npc_kolin.h

@@ -2,6 +2,7 @@
 #define D_A_NPC_KOLIN_H
 
 #include "d/actor/d_a_npc.h"
+#include <cstring>
 
 struct daNpc_Kolin_HIOParam {
     /* 0x00 */ daNpcT_HIOParam common;

include/d/actor/d_a_npc_the.h

@@ -2,6 +2,7 @@
 #define D_A_NPC_THE_H
 
 #include "d/actor/d_a_npc4.h"
+#include <cstring>
 
 struct daNpcThe_HIOParam {
     /* 0x00 */ daNpcF_HIOParam common;

include/d/actor/d_a_obj_cblock.h

@@ -5,7 +5,7 @@
 #include "d/d_cc_d.h"
 #include "f_op/f_op_actor_mng.h"
 
-class dPath;
+struct dPath;
 
 /**
  * @ingroup actors-objects

include/d/actor/d_a_passer_mng.h

@@ -5,7 +5,7 @@
 #include "d/d_kankyo.h"
 #include "f_op/f_op_actor_mng.h"
 
-class dPath;
+struct dPath;
 
 /**
  * @ingroup actors-unsorted

include/d/d_bg_s_cap_poly.h

@@ -4,7 +4,7 @@
 #include "d/d_bg_s_chk.h"
 #include "SSystem/SComponent/c_m3d_g_aab.h"
 
-struct dBgS_CaptPoly;
+class dBgS_CaptPoly;
 
 typedef void (*CaptPolyCallback)(dBgS_CaptPoly&, cBgD_Vtx_t*, u16, u16, u16, cM3dGPla*);
 

include/d/d_bg_w.h

@@ -11,7 +11,7 @@ class cBgS_GrpPassChk;
 class cBgS_PolyPassChk;
 class fopAc_ac_c;
 struct cBgD_Vtx_t;
-struct dBgS_CaptPoly;
+class dBgS_CaptPoly;
 
 class cBgW_TriElm {
 public:

include/d/d_bg_w_base.h

@@ -11,7 +11,7 @@ class cBgS_GndChk;
 class cBgS_LinChk;
 class cBgS_ShdwDraw;
 class dBgS_Acch;
-struct dBgS_CaptPoly;
+class dBgS_CaptPoly;
 class dBgS_RoofChk;
 class dBgS_SphChk;
 class dBgS_SplGrpChk;

include/d/d_bg_w_kcol.h

@@ -9,8 +9,8 @@
 
 class cBgS_GrpPassChk;
 class cBgS_PolyPassChk;
-struct dBgPc;
-struct dBgS_CaptPoly;
+class dBgPc;
+class dBgS_CaptPoly;
 
 struct KC_PrismData {
     /* 0x0 */ f32 height;

include/d/d_com_inf_game.h

@@ -15,6 +15,7 @@
 #include "global.h"
 #include "m_Do/m_Do_controller_pad.h"
 #include "m_Do/m_Do_graphic.h"
+#include <cstring>
 
 enum dComIfG_ButtonStatus {
     /* 0x00 */ BUTTON_STATUS_NONE,

include/d/d_debug_camera.h

@@ -3,6 +3,7 @@
 
 #include "d/d_camera.h"
 #include "JSystem/JHostIO/JORFile.h"
+#include <cstring>
 
 enum dDbgCam_KeyAction {
     /* | */ dDbgCam_KeyAction_FIXEDFRM,

include/d/d_map.h

@@ -3,6 +3,7 @@
 
 #include "d/d_map_path_dmap.h"
 #include "JSystem/JHostIO/JORReflexible.h"
+#include <cstring>
 
 struct dMap_HIO_prm_other_s {
     /* 0x00 */ u8 field_0x0;

include/d/d_menu_fmap_map.h

@@ -3,6 +3,7 @@
 
 #include "SSystem/SComponent/c_counter.h"
 #include <dolphin/types.h>
+#include <cstring>
 #include "d/d_menu_fmap.h"
 #include "d/d_map.h"
 #include "d/d_map_path.h"

include/d/d_msg_object.h

@@ -4,6 +4,7 @@
 #include "JSystem/JMessage/control.h"
 #include "d/d_com_inf_game.h"
 #include "f_op/f_op_msg.h"
+#include <cstring>
 
 class COutFont_c;
 class J2DTextBox;

include/d/d_name.h

@@ -2,6 +2,7 @@
 #define D_D_NAME_H
 
 #include "d/d_select_cursor.h"
+#include <cstring>
 
 class CPaneMgr;
 class CPaneMgrAlpha;