Fix building SDL3 without dialog support

CMakeLists.txt

@@ -2872,9 +2872,9 @@ elseif(N3DS)
   sdl_glob_sources("${SDL3_SOURCE_DIR}/src/file/n3ds/*.c")
 endif()
 
+sdl_sources(${SDL3_SOURCE_DIR}/src/dialog/SDL_dialog.c)
 if (SDL_DIALOG)
   sdl_sources(${SDL3_SOURCE_DIR}/src/dialog/SDL_dialog_utils.c)
-  sdl_sources(${SDL3_SOURCE_DIR}/src/dialog/SDL_dialog.c)
   if(ANDROID)
     sdl_sources(${SDL3_SOURCE_DIR}/src/dialog/android/SDL_androiddialog.c)
     set(HAVE_SDL_DIALOG TRUE)

include/build_config/SDL_build_config.h.cmake

@@ -257,16 +257,17 @@
 
 /* Allow disabling of major subsystems */
 #cmakedefine SDL_AUDIO_DISABLED @SDL_AUDIO_DISABLED@
+#cmakedefine SDL_VIDEO_DISABLED @SDL_VIDEO_DISABLED@
+#cmakedefine SDL_GPU_DISABLED @SDL_GPU_DISABLED@
+#cmakedefine SDL_RENDER_DISABLED @SDL_RENDER_DISABLED@
+#cmakedefine SDL_CAMERA_DISABLED @SDL_CAMERA_DISABLED@
 #cmakedefine SDL_JOYSTICK_DISABLED @SDL_JOYSTICK_DISABLED@
 #cmakedefine SDL_HAPTIC_DISABLED @SDL_HAPTIC_DISABLED@
 #cmakedefine SDL_HIDAPI_DISABLED @SDL_HIDAPI_DISABLED@
+#cmakedefine SDL_POWER_DISABLED @SDL_POWER_DISABLED@
 #cmakedefine SDL_SENSOR_DISABLED @SDL_SENSOR_DISABLED@
-#cmakedefine SDL_RENDER_DISABLED @SDL_RENDER_DISABLED@
+#cmakedefine SDL_DIALOG_DISABLED @SDL_DIALOG_DISABLED@
 #cmakedefine SDL_THREADS_DISABLED @SDL_THREADS_DISABLED@
-#cmakedefine SDL_VIDEO_DISABLED @SDL_VIDEO_DISABLED@
-#cmakedefine SDL_POWER_DISABLED @SDL_POWER_DISABLED@
-#cmakedefine SDL_CAMERA_DISABLED @SDL_CAMERA_DISABLED@
-#cmakedefine SDL_GPU_DISABLED @SDL_GPU_DISABLED@
 
 /* Enable various audio drivers */
 #cmakedefine SDL_AUDIO_DRIVER_ALSA @SDL_AUDIO_DRIVER_ALSA@

src/dialog/SDL_dialog.c

@@ -28,7 +28,10 @@ void SDL_ShowFileDialogWithProperties(SDL_FileDialogType type, SDL_DialogFileCal
     if (!callback) {
         return;
     }
-
+#ifdef SDL_DIALOG_DISABLED
+    SDL_SetError("SDL not built with dialog support");
+    callback(userdata, NULL, -1);
+#else
     SDL_DialogFileFilter *filters = SDL_GetPointerProperty(props, SDL_PROP_FILE_DIALOG_FILTERS_POINTER, NULL);
     int nfilters = (int) SDL_GetNumberProperty(props, SDL_PROP_FILE_DIALOG_NFILTERS_NUMBER, -1);
 
@@ -58,10 +61,18 @@ void SDL_ShowFileDialogWithProperties(SDL_FileDialogType type, SDL_DialogFileCal
         callback(userdata, NULL, -1);
         break;
     };
+#endif
 }
 
 void SDL_ShowOpenFileDialog(SDL_DialogFileCallback callback, void *userdata, SDL_Window *window, const SDL_DialogFileFilter *filters, int nfilters, const char *default_location, bool allow_many)
 {
+#ifdef SDL_DIALOG_DISABLED
+    if (!callback) {
+        return;
+    }
+    SDL_SetError("SDL not built with dialog support");
+    callback(userdata, NULL, -1);
+#else
     SDL_PropertiesID props = SDL_CreateProperties();
 
     SDL_SetPointerProperty(props, SDL_PROP_FILE_DIALOG_FILTERS_POINTER, (void *) filters);
@@ -73,10 +84,18 @@ void SDL_ShowOpenFileDialog(SDL_DialogFileCallback callback, void *userdata, SDL
     SDL_ShowFileDialogWithProperties(SDL_FILEDIALOG_OPENFILE, callback, userdata, props);
 
     SDL_DestroyProperties(props);
+#endif
 }
 
 void SDL_ShowSaveFileDialog(SDL_DialogFileCallback callback, void *userdata, SDL_Window *window, const SDL_DialogFileFilter *filters, int nfilters, const char *default_location)
 {
+#ifdef SDL_DIALOG_DISABLED
+    if (!callback) {
+        return;
+    }
+    SDL_SetError("SDL not built with dialog support");
+    callback(userdata, NULL, -1);
+#else
     SDL_PropertiesID props = SDL_CreateProperties();
 
     SDL_SetPointerProperty(props, SDL_PROP_FILE_DIALOG_FILTERS_POINTER, (void *) filters);
@@ -87,10 +106,18 @@ void SDL_ShowSaveFileDialog(SDL_DialogFileCallback callback, void *userdata, SDL
     SDL_ShowFileDialogWithProperties(SDL_FILEDIALOG_SAVEFILE, callback, userdata, props);
 
     SDL_DestroyProperties(props);
+#endif
 }
 
 void SDL_ShowOpenFolderDialog(SDL_DialogFileCallback callback, void *userdata, SDL_Window *window, const char *default_location, bool allow_many)
 {
+#ifdef SDL_DIALOG_DISABLED
+    if (!callback) {
+        return;
+    }
+    SDL_SetError("SDL not built with dialog support");
+    callback(userdata, NULL, -1);
+#else
     SDL_PropertiesID props = SDL_CreateProperties();
 
     SDL_SetPointerProperty(props, SDL_PROP_FILE_DIALOG_WINDOW_POINTER, window);
@@ -100,4 +127,5 @@ void SDL_ShowOpenFolderDialog(SDL_DialogFileCallback callback, void *userdata, S
     SDL_ShowFileDialogWithProperties(SDL_FILEDIALOG_OPENFOLDER, callback, userdata, props);
 
     SDL_DestroyProperties(props);
+#endif
 }