diff --git a/core/hw/aica/sgc_if.cpp b/core/hw/aica/sgc_if.cpp
index 2bd3d4787..f2694b621 100755
--- a/core/hw/aica/sgc_if.cpp
+++ b/core/hw/aica/sgc_if.cpp
@@ -75,17 +75,17 @@ static const double AEG_DSR_Time[64] =
 };
 // These times come from the documentation but don't sound correct.
 // HT uses the AEG decay times instead and it sounds better.
-static const double FEG_Time[] =
-{
-	-1, -1, 472800.0, 405200.0, 354400.0, 283600.0, 236400.0, 202800.0,
-	177200.0, 142000.0, 118400.0, 101200.0, 88800.0, 70800.0, 59200.0, 50800.0,
-	44400.0, 35600.0, 29600.0, 25200.0, 22000.0, 17600.0, 14800.0, 12800.0,
-	11200.0, 8800.0, 7200.0, 6400.0, 5600.0, 4400.0, 3680.0, 3160.0,
-	2760.0, 2220.0, 1840.0, 1560.0, 1360.0, 1080.0, 920.0, 800.0,
-	680.0, 560.0, 440.0, 392.0, 340.0, 272.0, 228.0, 196.0,
-	172.0, 158.0, 136.0, 100.0, 88.0, 72.0, 56.0, 48.0,
-	44.0, 34.0, 28.0, 24.0, 22.0, 17.0, 14.0, 12.0
-};
+//static const double FEG_Time[] =
+//{
+//	-1, -1, 472800.0, 405200.0, 354400.0, 283600.0, 236400.0, 202800.0,
+//	177200.0, 142000.0, 118400.0, 101200.0, 88800.0, 70800.0, 59200.0, 50800.0,
+//	44400.0, 35600.0, 29600.0, 25200.0, 22000.0, 17600.0, 14800.0, 12800.0,
+//	11200.0, 8800.0, 7200.0, 6400.0, 5600.0, 4400.0, 3680.0, 3160.0,
+//	2760.0, 2220.0, 1840.0, 1560.0, 1360.0, 1080.0, 920.0, 800.0,
+//	680.0, 560.0, 440.0, 392.0, 340.0, 272.0, 228.0, 196.0,
+//	172.0, 158.0, 136.0, 100.0, 88.0, 72.0, 56.0, 48.0,
+//	44.0, 34.0, 28.0, 24.0, 22.0, 17.0, 14.0, 12.0
+//};
 static const float PLFOS_Scale[8] = { 0.f, 3.61f, 7.22f, 14.44f, 28.88f, 57.75f, 115.5f, 231.f };
 static int PLFO_Scales[8][256];
 
diff --git a/core/hw/pvr/elan.cpp b/core/hw/pvr/elan.cpp
index 70c29e381..f835da8a4 100644
--- a/core/hw/pvr/elan.cpp
+++ b/core/hw/pvr/elan.cpp
@@ -563,12 +563,6 @@ static glm::vec3 getNormal(const T& vtx)
 	return { (int8_t)vtx.header.nx / 127.f, (int8_t)vtx.header.ny / 127.f, (int8_t)vtx.header.nz / 127.f };
 }
 
-template<>
-glm::vec3 getNormal(const N2_VERTEX_VNU& vtx)
-{
-	return { vtx.normal.nx, vtx.normal.ny, vtx.normal.nz };
-}
-
 template<typename T>
 static void setNormal(Vertex& vd, const T& vs)
 {
diff --git a/core/hw/pvr/spg.cpp b/core/hw/pvr/spg.cpp
index 64a51b5e3..acf9bc592 100755
--- a/core/hw/pvr/spg.cpp
+++ b/core/hw/pvr/spg.cpp
@@ -17,7 +17,9 @@ static u32 pvr_numscanlines = 512;
 static u32 prv_cur_scanline = -1;
 static u32 vblk_cnt;
 
+#if !defined(NDEBUG) || defined(DEBUGFAST)
 static float last_fps;
+#endif
 
 //54 mhz pixel clock
 #define PIXEL_CLOCK (54*1000*1000/2)
diff --git a/core/hw/pvr/ta.cpp b/core/hw/pvr/ta.cpp
index 4f542a29b..2bbbaaa0e 100644
--- a/core/hw/pvr/ta.cpp
+++ b/core/hw/pvr/ta.cpp
@@ -486,8 +486,8 @@ static void markObjectListBlocks()
 				return;
 		}
 	}
-	for (int y = 0; y <= TA_GLOB_TILE_CLIP.tile_y_num; y++)
-		for (int x = 0; x <= TA_GLOB_TILE_CLIP.tile_x_num; x++)
+	for (u32 y = 0; y <= TA_GLOB_TILE_CLIP.tile_y_num; y++)
+		for (u32 x = 0; x <= TA_GLOB_TILE_CLIP.tile_x_num; x++)
 		{
 			pvr_write32p(addr, TA_OL_BASE);
 			addr += opBlockSize;
diff --git a/core/hw/sh4/modules/fastmmu.cpp b/core/hw/sh4/modules/fastmmu.cpp
index 9ed75062e..de6c01750 100644
--- a/core/hw/sh4/modules/fastmmu.cpp
+++ b/core/hw/sh4/modules/fastmmu.cpp
@@ -49,7 +49,6 @@ struct TLB_LinkedEntry {
 static TLB_LinkedEntry full_table[65536];
 static u32 full_table_size;
 static TLB_LinkedEntry *entry_buckets[NBUCKETS];
-u32 mmuAddressLUT[0x100000];
 
 static u16 bucket_index(u32 address, int size, u32 asid)
 {
diff --git a/core/hw/sh4/modules/mmu.cpp b/core/hw/sh4/modules/mmu.cpp
index b592dfcb1..0b861e54b 100644
--- a/core/hw/sh4/modules/mmu.cpp
+++ b/core/hw/sh4/modules/mmu.cpp
@@ -512,6 +512,8 @@ void mmu_set_state()
 	SetMemoryHandlers();
 }
 
+u32 mmuAddressLUT[0x100000];
+
 void MMU_init()
 {
 	memset(ITLB_LRU_USE, 0xFF, sizeof(ITLB_LRU_USE));
diff --git a/core/hw/sh4/modules/wince.h b/core/hw/sh4/modules/wince.h
index 80655f1f6..8abf1bd34 100644
--- a/core/hw/sh4/modules/wince.h
+++ b/core/hw/sh4/modules/wince.h
@@ -18,6 +18,7 @@
  */
 #include "hw/sh4/sh4_sched.h"
 
+#ifdef TRACE_WINCE_SYSCALLS
 #define	PUserKData 			0x00005800
 #define	SYSHANDLE_OFFSET	0x004
 #define	SYS_HANDLE_BASE		64
@@ -225,10 +226,8 @@ static const char *wince_methods[][256] = {
 		},
 };
 
-#ifdef TRACE_WINCE_SYSCALLS
 extern u32 unresolved_ascii_string;
 extern u32 unresolved_unicode_string;
-#endif
 
 static inline std::string get_unicode_string(u32 addr)
 {
@@ -238,9 +237,7 @@ static inline std::string get_unicode_string(u32 addr)
 		u16 c;
 		if (!read_mem16(addr, c))
 		{
-#ifdef TRACE_WINCE_SYSCALLS
 			unresolved_unicode_string = addr;
-#endif
 			return "(page fault)";
 		}
 		if (c == 0)
@@ -250,6 +247,7 @@ static inline std::string get_unicode_string(u32 addr)
 	}
 	return str;
 }
+
 static inline std::string get_ascii_string(u32 addr)
 {
 	std::string str;
@@ -258,9 +256,7 @@ static inline std::string get_ascii_string(u32 addr)
 		u8 c;
 		if (!read_mem8(addr++, c))
 		{
-#ifdef TRACE_WINCE_SYSCALLS
 			unresolved_ascii_string = addr;
-#endif
 			return "(page fault)";
 		}
 		if (c == 0)
@@ -352,7 +348,9 @@ static bool print_wince_syscall(u32 address)
 		return false;
 
 }
+#endif
 
+#if defined(FAST_MMU) && defined(USE_WINCE_HACK)
 static bool wince_resolve_address(u32 va, TLB_Entry &entry)
 {
 	// WinCE hack
@@ -407,3 +405,4 @@ static bool wince_resolve_address(u32 va, TLB_Entry &entry)
 
 	return false;
 }
+#endif
diff --git a/core/imgread/ioctl.cpp b/core/imgread/ioctl.cpp
index 33095fd93..20a632fa5 100644
--- a/core/imgread/ioctl.cpp
+++ b/core/imgread/ioctl.cpp
@@ -260,7 +260,6 @@ struct PhysicalDrive:Disc
 
 bool PhysicalTrack::Read(u32 FAD,u8* dst,SectorFormat* sector_type,u8* subcode,SubcodeFormat* subcode_type)
 {
-	u32 fmt=0;
 	static u8 temp[2500];
 
 	u32 LBA=FAD-150;
diff --git a/core/linux-dist/main.cpp b/core/linux-dist/main.cpp
index 2443e61fb..365482ad1 100644
--- a/core/linux-dist/main.cpp
+++ b/core/linux-dist/main.cpp
@@ -216,6 +216,7 @@ std::string find_user_data_dir()
 #endif
 }
 
+#ifndef __SWITCH__
 static void addDirectoriesFromPath(std::vector<std::string>& dirs, const std::string& path, const std::string& suffix)
 {
 	std::string::size_type pos = 0;
@@ -231,6 +232,7 @@ static void addDirectoriesFromPath(std::vector<std::string>& dirs, const std::st
 	if (pos < path.length())
 		dirs.push_back(path.substr(pos) + suffix);
 }
+#endif
 
 // Find a file in the user and system config directories.
 // The following folders are checked in this order:
diff --git a/core/network/picoppp.cpp b/core/network/picoppp.cpp
index 7fea7cddf..2205fcfd6 100644
--- a/core/network/picoppp.cpp
+++ b/core/network/picoppp.cpp
@@ -738,8 +738,8 @@ static pico_device *pico_eth_create()
         return nullptr;
 
     const u8 mac_addr[6] = { 0xc, 0xa, 0xf, 0xe, 0, 1 };
-    if (0 != pico_device_init(eth, "ETHPEER", mac_addr))
-        return nullptr;
+	if (0 != pico_device_init(eth, "ETHPEER", mac_addr))
+		return nullptr;
 
 	DEBUG_LOG(NETWORK, "Device %s created", eth->name);
 
@@ -1045,8 +1045,8 @@ static void *pico_thread_func(void *)
 		PICO_IDLE();
     }
 
-    for (auto it = tcp_listening_sockets.begin(); it != tcp_listening_sockets.end(); it++)
-    	closesocket(it->second);
+	for (auto it = tcp_listening_sockets.begin(); it != tcp_listening_sockets.end(); it++)
+		closesocket(it->second);
 	close_native_sockets();
 	pico_socket_close(pico_tcp_socket);
 	pico_socket_close(pico_udp_socket);
diff --git a/core/rec-ARM64/rec_arm64.cpp b/core/rec-ARM64/rec_arm64.cpp
index d8417dd18..f96a506ed 100644
--- a/core/rec-ARM64/rec_arm64.cpp
+++ b/core/rec-ARM64/rec_arm64.cpp
@@ -54,7 +54,6 @@ struct DynaRBI : RuntimeBlockInfo
 	}
 };
 
-static u32 cycle_counter;
 static u64 jmp_stack;
 static Arm64UnwindInfo unwinder;
 
diff --git a/core/rend/gles/gldraw.cpp b/core/rend/gles/gldraw.cpp
index e9d124f3b..367811ca8 100644
--- a/core/rend/gles/gldraw.cpp
+++ b/core/rend/gles/gldraw.cpp
@@ -317,7 +317,7 @@ void DrawSorted(bool multipass)
 	//if any drawing commands, draw them
 	if (!pidx_sort.empty())
 	{
-		u32 count=pidx_sort.size();
+		std::size_t count = pidx_sort.size();
 
 		{
 			//set some 'global' modes for all primitives
@@ -326,7 +326,7 @@ void DrawSorted(bool multipass)
 			glcache.StencilFunc(GL_ALWAYS,0,0);
 			glcache.StencilOp(GL_KEEP,GL_KEEP,GL_REPLACE);
 
-			for (u32 p=0; p<count; p++)
+			for (std::size_t p = 0; p < count; p++)
 			{
 				const PolyParam* params = pidx_sort[p].ppid;
 				if (pidx_sort[p].count>2) //this actually happens for some games. No idea why ..
@@ -368,7 +368,7 @@ void DrawSorted(bool multipass)
 				glcache.DepthFunc(GL_GEQUAL);
 				glcache.DepthMask(GL_TRUE);
 
-				for (u32 p = 0; p < count; p++)
+				for (std::size_t p = 0; p < count; p++)
 				{
 					const PolyParam* params = pidx_sort[p].ppid;
 					if (pidx_sort[p].count > 2 && !params->isp.ZWriteDis) {
diff --git a/core/rend/gui.cpp b/core/rend/gui.cpp
index 2238e05a2..e0994e069 100644
--- a/core/rend/gui.cpp
+++ b/core/rend/gui.cpp
@@ -1694,7 +1694,7 @@ static void gui_display_settings()
 		    	OptionCheckbox("Widescreen Game Cheats", config::WidescreenGameHacks,
 		    			"Modify the game so that it displays in 16:9 anamorphic format and use horizontal screen stretching. Only some games are supported.");
 
-				const std::array<float, 5> aniso{ 1, 2, 4, 8, 16 };
+				const std::array<int, 5> aniso{ 1, 2, 4, 8, 16 };
 	            const std::array<std::string, 5> anisoText{ "Disabled", "2x", "4x", "8x", "16x" };
 	            u32 afSelected = 0;
 	            for (u32 i = 0; i < aniso.size(); i++)
@@ -2826,7 +2826,7 @@ void gui_display_osd()
 			ImGui::Begin("##osd", NULL, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoNav
 					| ImGuiWindowFlags_NoInputs | ImGuiWindowFlags_NoBackground);
 			ImGui::SetWindowFontScale(1.5);
-			ImGui::TextColored(ImVec4(1, 1, 0, 0.7), "%s", message.c_str());
+			ImGui::TextColored(ImVec4(1, 1, 0, 0.7f), "%s", message.c_str());
 			ImGui::End();
 		}
 		imguiDriver->displayCrosshairs();
diff --git a/core/rend/vulkan/oit/oit_drawer.h b/core/rend/vulkan/oit/oit_drawer.h
index d97f5840b..8442e89b7 100644
--- a/core/rend/vulkan/oit/oit_drawer.h
+++ b/core/rend/vulkan/oit/oit_drawer.h
@@ -101,7 +101,7 @@ protected:
 					| vk::BufferUsageFlagBits::eStorageBuffer));
 		}
 		return mainBuffers[bufferIndex].get();
-	};
+	}
 
 	void MakeBuffers(int width, int height);
 	virtual vk::Format GetColorFormat() const = 0;
diff --git a/core/rend/vulkan/vmallocator.cpp b/core/rend/vulkan/vmallocator.cpp
index 1c4653b4e..6a441d2c5 100644
--- a/core/rend/vulkan/vmallocator.cpp
+++ b/core/rend/vulkan/vmallocator.cpp
@@ -23,6 +23,7 @@
 #include "vmallocator.h"
 #include "vulkan_context.h"
 
+#if !defined(NDEBUG) || defined(DEBUGFAST)
 VKAPI_ATTR static void VKAPI_CALL vmaAllocateDeviceMemoryCallback(
     VmaAllocator      allocator,
     uint32_t          memoryType,
@@ -44,6 +45,7 @@ VKAPI_ATTR static void VKAPI_CALL vmaFreeDeviceMemoryCallback(
 }
 
 static const VmaDeviceMemoryCallbacks memoryCallbacks = { vmaAllocateDeviceMemoryCallback, vmaFreeDeviceMemoryCallback };
+#endif
 
 void VMAllocator::Init(vk::PhysicalDevice physicalDevice, vk::Device device, vk::Instance instance)
 {
diff --git a/core/windows/winmain.cpp b/core/windows/winmain.cpp
index 2578d4215..8a5b1a5d2 100644
--- a/core/windows/winmain.cpp
+++ b/core/windows/winmain.cpp
@@ -281,9 +281,9 @@ void UpdateInputState()
 #endif
 }
 
+#ifndef USE_SDL
 static HWND hWnd;
 
-#ifndef USE_SDL
 // Windows class name to register
 #define WINDOW_CLASS "nilDC"
 static int window_x, window_y;
diff --git a/shell/apple/emulator-osx/emulator-osx/SDLMain.mm b/shell/apple/emulator-osx/emulator-osx/SDLMain.mm
index fe644ca7a..ee3122060 100644
--- a/shell/apple/emulator-osx/emulator-osx/SDLMain.mm
+++ b/shell/apple/emulator-osx/emulator-osx/SDLMain.mm
@@ -184,7 +184,6 @@ static void setupWindowMenu(void)
 static void setupHelpMenu(void)
 {
     NSMenu      *helpMenu;
-    NSString    *title;
     NSMenuItem  *helpMenuItem;
     NSMenuItem  *menuItem;