Fixed build warnings and errors

src/haptic/windows/SDL_dinputhaptic.c

@@ -325,7 +325,7 @@ SDL_DINPUT_HapticOpenFromDevice(SDL_Haptic * haptic, LPDIRECTINPUTDEVICE8 device
 
         /* Set data format. */
         ret = IDirectInputDevice8_SetDataFormat(haptic->hwdata->device,
-                                                &c_dfDIJoystick2);
+                                                &SDL_c_dfDIJoystick2);
         if (FAILED(ret)) {
             DI_SetError("Setting data format", ret);
             goto acquire_err;

src/joystick/windows/SDL_dinputjoystick.c

@@ -214,7 +214,7 @@ static DIOBJECTDATAFORMAT dfDIJoystick2[] = {
         { &GUID_Slider, FIELD_OFFSET(DIJOYSTATE2, rglFSlider[1]), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, 0 },
 };
 
-static const DIDATAFORMAT c_dfDIJoystick2 = {
+const DIDATAFORMAT SDL_c_dfDIJoystick2 = {
     sizeof(DIDATAFORMAT),
     sizeof(DIOBJECTDATAFORMAT),
     DIDF_ABSAXIS,
@@ -594,7 +594,7 @@ SDL_DINPUT_JoystickOpen(SDL_Joystick * joystick, JoyStick_DeviceData *joystickde
     /* Use the extended data structure: DIJOYSTATE2. */
     result =
         IDirectInputDevice8_SetDataFormat(joystick->hwdata->InputDevice,
-        &c_dfDIJoystick2);
+        &SDL_c_dfDIJoystick2);
     if (FAILED(result)) {
         return SetDIerror("IDirectInputDevice8::SetDataFormat", result);
     }

src/joystick/windows/SDL_dinputjoystick_c.h

@@ -27,4 +27,6 @@ extern void SDL_DINPUT_JoystickUpdate(SDL_Joystick * joystick);
 extern void SDL_DINPUT_JoystickClose(SDL_Joystick * joystick);
 extern void SDL_DINPUT_JoystickQuit(void);
 
+extern const DIDATAFORMAT SDL_c_dfDIJoystick2;
+
 /* vi: set ts=4 sw=4 expandtab: */

src/render/opengl/SDL_render_gl.c

@@ -1439,7 +1439,10 @@ GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
         return SDL_OutOfMemory();
     }
 
-    convert_format(data, temp_format, &internalFormat, &format, &type);
+    if (!convert_format(data, temp_format, &internalFormat, &format, &type)) {
+        return SDL_SetError("Texture format %s not supported by OpenGL",
+                            SDL_GetPixelFormatName(temp_format));
+    }
 
     SDL_GetRendererOutputSize(renderer, &w, &h);
 

src/video/x11/SDL_x11video.c

@@ -290,7 +290,7 @@ X11_CreateDevice(int devindex)
     device->StartTextInput = X11_StartTextInput;
     device->StopTextInput = X11_StopTextInput;
     device->SetTextInputRect = X11_SetTextInputRect;
-    
+
     device->free = X11_DeleteDevice;
 
     return device;
@@ -395,33 +395,31 @@ X11_VideoInit(_THIS)
            Compose keys will work correctly. */
         char *prev_locale = setlocale(LC_ALL, NULL);
         char *prev_xmods  = X11_XSetLocaleModifiers(NULL);
-        
+        const char *new_xmods = "";
+        const char *env_xmods = SDL_getenv("XMODIFIERS");
+
         if (prev_xmods) {
             prev_xmods = SDL_strdup(prev_xmods);
         }
-        
+
         /* IBus resends some key events that were filtered by XFilterEvents
            when it is used via XIM which causes issues. Prevent this by forcing
            @im=none if XMODIFIERS contains @im=ibus. IBus can still be used via 
            the DBus implementation, which also has support for pre-editing. */
-        const char *new_xmods = "";
-        const char *env_xmods = SDL_getenv("XMODIFIERS");
-        
         if (env_xmods && SDL_strstr(env_xmods, "@im=ibus") != NULL) {
             new_xmods = "@im=none";
         }
-        
+
         setlocale(LC_ALL, "");
         X11_XSetLocaleModifiers(new_xmods);
-        
-        data->im =
-            X11_XOpenIM(data->display, NULL, data->classname, data->classname);
-        
+
+        data->im = X11_XOpenIM(data->display, NULL, data->classname, data->classname);
+
         /* Reset the locale + X locale modifiers back to how they were,
            locale first because the X locale modifiers depend on it. */
         setlocale(LC_ALL, prev_locale);
         X11_XSetLocaleModifiers(prev_xmods);
-        
+
         if (prev_xmods) {
             SDL_free(prev_xmods);
         }