Fix some more compiler warnings on armcc.

include/SDL_stdinc.h

@@ -127,11 +127,18 @@
  */
 /* @{ */
 
+#ifdef __CC_ARM
+/* ARM's compiler throws warnings if we use an enum: like "SDL_bool x = a < b;" */
+#define SDL_FALSE 0
+#define SDL_TRUE 1
+typedef int SDL_bool;
+#else
 typedef enum
 {
     SDL_FALSE = 0,
     SDL_TRUE = 1
 } SDL_bool;
+#endif
 
 /**
  * \brief A signed 8-bit integer type.

src/audio/SDL_audiocvt.c

@@ -1038,9 +1038,8 @@ SDL_ResampleAudioStream_si16_c2(SDL_AudioStream *stream, const void *_inbuf, con
     const Sint16 *inbuf = (const Sint16 *) _inbuf;
     Sint16 *outbuf = (Sint16 *) _outbuf;
     SDL_AudioStreamResamplerState *state = (SDL_AudioStreamResamplerState*)stream->resampler_state;
-    const int chans = (int)stream->pre_resample_channels;
 
-    SDL_assert(chans <= SDL_arraysize(state->resampler_state.si16));
+    SDL_assert(((int)stream->pre_resample_channels) <= SDL_arraysize(state->resampler_state.si16));
 
     if (!state->resampler_seeded) {
         state->resampler_state.si16[0] = inbuf[0];

src/cpuinfo/SDL_cpuinfo.c

@@ -229,7 +229,7 @@ done:
 }
 #else
 #define cpuid(func, a, b, c, d) \
-    a = b = c = d = 0
+    do { a = b = c = d = 0; (void) a; (void) b; (void) c; (void) d; } while (0)
 #endif
 
 static int CPU_CPUIDFeatures[4];

src/events/SDL_keyboard.c

@@ -569,7 +569,7 @@ SDL_ResetKeyboard(void)
 #ifdef DEBUG_KEYBOARD
     printf("Resetting keyboard\n");
 #endif
-    for (scancode = 0; scancode < SDL_NUM_SCANCODES; ++scancode) {
+    for (scancode = (SDL_Scancode) 0; scancode < SDL_NUM_SCANCODES; ++scancode) {
         if (keyboard->keystate[scancode] == SDL_PRESSED) {
             SDL_SendKeyboardKey(SDL_RELEASED, scancode);
         }
@@ -834,7 +834,7 @@ SDL_GetModState(void)
 {
     SDL_Keyboard *keyboard = &SDL_keyboard;
 
-    return keyboard->modstate;
+    return (SDL_Keymod) keyboard->modstate;
 }
 
 void
@@ -863,7 +863,7 @@ SDL_GetKeyFromScancode(SDL_Scancode scancode)
 {
     SDL_Keyboard *keyboard = &SDL_keyboard;
 
-    if (scancode < SDL_SCANCODE_UNKNOWN || scancode >= SDL_NUM_SCANCODES) {
+    if (((int)scancode) < ((int)SDL_SCANCODE_UNKNOWN) || scancode >= SDL_NUM_SCANCODES) {
           SDL_InvalidParamError("scancode");
           return 0;
     }
@@ -890,7 +890,7 @@ const char *
 SDL_GetScancodeName(SDL_Scancode scancode)
 {
     const char *name;
-    if (scancode < SDL_SCANCODE_UNKNOWN || scancode >= SDL_NUM_SCANCODES) {
+    if (((int)scancode) < ((int)SDL_SCANCODE_UNKNOWN) || scancode >= SDL_NUM_SCANCODES) {
           SDL_InvalidParamError("scancode");
           return "";
     }

src/joystick/SDL_gamecontroller.c

@@ -382,7 +382,7 @@ SDL_GameControllerAxis SDL_GameControllerGetAxisFromString(const char *pchString
 
     for (entry = 0; map_StringForControllerAxis[entry]; ++entry) {
         if (!SDL_strcasecmp(pchString, map_StringForControllerAxis[entry]))
-            return entry;
+            return (SDL_GameControllerAxis) entry;
     }
     return SDL_CONTROLLER_AXIS_INVALID;
 }
@@ -428,7 +428,7 @@ SDL_GameControllerButton SDL_GameControllerGetButtonFromString(const char *pchSt
 
     for (entry = 0; map_StringForControllerButton[entry]; ++entry) {
         if (SDL_strcasecmp(pchString, map_StringForControllerButton[entry]) == 0)
-            return entry;
+            return (SDL_GameControllerButton) entry;
     }
     return SDL_CONTROLLER_BUTTON_INVALID;
 }
@@ -804,6 +804,8 @@ static ControllerMapping_t *SDL_PrivateGetControllerMapping(int device_index)
     SDL_JoystickGUID jGUID = SDL_JoystickGetDeviceGUID(device_index);
     ControllerMapping_t *mapping;
 
+    (void) s_pEmscriptenMapping;  /* pacify ARMCC */
+
     mapping = SDL_PrivateGetControllerMappingForGUID(&jGUID);
 #if SDL_JOYSTICK_XINPUT
     if (!mapping && SDL_SYS_IsXInputGamepad_DeviceIndex(device_index)) {

src/render/SDL_render.c

@@ -1938,7 +1938,7 @@ SDL_DestroyRenderer(SDL_Renderer * renderer)
 
     /* Free existing textures for this renderer */
     while (renderer->textures) {
-        SDL_Texture *tex = renderer->textures;
+        SDL_Texture *tex = renderer->textures; (void) tex;
         SDL_DestroyTexture(renderer->textures);
         SDL_assert(tex != renderer->textures);  /* satisfy static analysis. */
     }

src/video/SDL_blit_A.c

@@ -1317,9 +1317,9 @@ SDL_CalculateBlitA(SDL_Surface * surface)
 
         case 3:
         default:
-            return BlitNtoNPixelAlpha;
+            break;
         }
-        break;
+        return BlitNtoNPixelAlpha;
 
     case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
         if (sf->Amask == 0) {

src/video/SDL_bmp.c

@@ -124,6 +124,9 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
     Uint32 biClrUsed = 0;
     /* Uint32 biClrImportant = 0; */
 
+    (void) haveRGBMasks;
+    (void) haveAlphaMask;
+
     /* Make sure we are passed a valid data source */
     surface = NULL;
     was_error = SDL_FALSE;