minor windows warning fixes.

Makefile.w32

@@ -136,6 +136,8 @@ SDL_blendpoint.obj: SDL_blendpoint.c
     wcc386 $(CFLAGS_DLL) -wcd=200 -fo=$^@ $<
 SDL_RLEaccel.obj: SDL_RLEaccel.c
     wcc386 $(CFLAGS_DLL) -wcd=201 -fo=$^@ $<
+SDL_malloc.obj: SDL_malloc.c
+    wcc386 $(CFLAGS_DLL) -wcd=201 -fo=$^@ $<
 
 # SDL2libm
 MSRCS= e_atan2.c e_exp.c e_fmod.c e_log10.c e_log.c e_pow.c e_rem_pio2.c e_sqrt.c &

src/joystick/windows/SDL_rawinputjoystick.c

@@ -1349,15 +1349,15 @@ RAWINPUT_JoystickRumbleTriggers(SDL_Joystick *joystick, Uint16 left_rumble, Uint
 static Uint32
 RAWINPUT_JoystickGetCapabilities(SDL_Joystick *joystick)
 {
-    RAWINPUT_DeviceContext *ctx = joystick->hwdata;
     Uint32 result = 0;
+#if defined(SDL_JOYSTICK_RAWINPUT_XINPUT) || defined(SDL_JOYSTICK_RAWINPUT_WGI)
+    RAWINPUT_DeviceContext *ctx = joystick->hwdata;
 
 #ifdef SDL_JOYSTICK_RAWINPUT_XINPUT
     if (ctx->is_xinput) {
         result |= SDL_JOYCAP_RUMBLE;
     }
 #endif
-
 #ifdef SDL_JOYSTICK_RAWINPUT_WGI
     if (ctx->is_xinput) {
         result |= SDL_JOYCAP_RUMBLE;
@@ -1367,6 +1367,7 @@ RAWINPUT_JoystickGetCapabilities(SDL_Joystick *joystick)
         }
     }
 #endif
+#endif /**/
 
     return result;
 }

src/video/windows/SDL_windowskeyboard.c

@@ -623,7 +623,7 @@ IME_GetId(SDL_VideoData *videodata, UINT uIndex)
         dwRet[0] = dwRet[1] = 0;
         return dwRet[0];
     }
-    if (ImmGetIMEFileNameA(hkl, szTemp, sizeof(szTemp) - 1) <= 0) {
+    if (!ImmGetIMEFileNameA(hkl, szTemp, sizeof(szTemp) - 1)) {
         dwRet[0] = dwRet[1] = 0;
         return dwRet[0];
     }
@@ -689,7 +689,7 @@ IME_SetupAPI(SDL_VideoData *videodata)
         return;
 
     hkl = videodata->ime_hkl;
-    if (ImmGetIMEFileNameA(hkl, ime_file, sizeof(ime_file) - 1) <= 0)
+    if (!ImmGetIMEFileNameA(hkl, ime_file, sizeof(ime_file) - 1))
         return;
 
     hime = SDL_LoadObject(ime_file);

src/video/windows/SDL_windowsvideo.c

@@ -334,6 +334,7 @@ WIN_DeclareDPIAwarePerMonitorV2(_THIS)
     }
 }
 
+#ifdef HIGHDPI_DEBUG
 static const char*
 WIN_GetDPIAwareness(_THIS)
 {
@@ -357,6 +358,7 @@ WIN_GetDPIAwareness(_THIS)
 
     return "";
 }
+#endif
 
 static void
 WIN_InitDPIAwareness(_THIS)

src/video/windows/SDL_windowswindow.c

@@ -118,13 +118,11 @@ GetWindowStyle(SDL_Window * window)
 
 /**
  * Returns arguments to pass to SetWindowPos - the window rect, including frame, in Windows coordinates.
- * 
  * Can be called before we have a HWND.
  */
 static void
 WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x, int *y, int *width, int *height, SDL_bool use_current)
 {
-    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
     SDL_VideoData* videodata = SDL_GetVideoDevice() ? SDL_GetVideoDevice()->driverdata : NULL;
     RECT rect;
     int dpi;
@@ -140,12 +138,12 @@ WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x
     WIN_ScreenPointFromSDL(x, y, &dpi);
     /* Note, use the guessed DPI returned from WIN_ScreenPointFromSDL rather than the cached one in
        data->scaling_dpi.
-       
+
        - This is called before the window is created, so we can't rely on data->scaling_dpi
        - Bug workaround: when leaving exclusive fullscreen, the cached DPI and window DPI reported
          by GetDpiForWindow will be wrong, and would cause windows shrinking slightly when
          going from exclusive fullscreen to windowed on a HighDPI monitor with scaling if we used them.
-    */  
+    */
     *width = MulDiv(*width, dpi, 96);
     *height = MulDiv(*height, dpi, 96);
 
@@ -163,7 +161,6 @@ WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x
         if (WIN_IsPerMonitorV2DPIAware(SDL_GetVideoDevice())) {
             /* With per-monitor v2, the window border/titlebar size depend on the DPI, so we need to call AdjustWindowRectExForDpi instead of 
                AdjustWindowRectEx. */
-            
             UINT unused;
             RECT screen_rect;
             HMONITOR mon;
@@ -855,7 +852,6 @@ WIN_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display,
 {
     SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;
     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
-    SDL_VideoData *videodata = data->videodata;
     HWND hwnd = data->hwnd;
     MONITORINFO minfo;
     DWORD style;