Made udev hwdb functionality optional

src/core/linux/SDL_udev.c

@@ -81,6 +81,9 @@ static bool SDL_UDEV_load_syms(void)
     if (!SDL_UDEV_load_sym(#x, (void **)(char *)&_this->syms.x)) \
         return false
 
+#define SDL_UDEV_SYM_OPTIONAL(x)                                 \
+    SDL_UDEV_load_sym(#x, (void **)(char *)&_this->syms.x);
+
     SDL_UDEV_SYM(udev_device_get_action);
     SDL_UDEV_SYM(udev_device_get_devnode);
     SDL_UDEV_SYM(udev_device_get_driver);
@@ -98,6 +101,7 @@ static bool SDL_UDEV_load_syms(void)
     SDL_UDEV_SYM(udev_enumerate_scan_devices);
     SDL_UDEV_SYM(udev_enumerate_unref);
     SDL_UDEV_SYM(udev_list_entry_get_name);
+    SDL_UDEV_SYM(udev_list_entry_get_value);
     SDL_UDEV_SYM(udev_list_entry_get_next);
     SDL_UDEV_SYM(udev_monitor_enable_receiving);
     SDL_UDEV_SYM(udev_monitor_filter_add_match_subsystem_devtype);
@@ -110,10 +114,9 @@ static bool SDL_UDEV_load_syms(void)
     SDL_UDEV_SYM(udev_device_new_from_devnum);
     SDL_UDEV_SYM(udev_device_get_devnum);
 
-    SDL_UDEV_SYM(udev_hwdb_new);
-    SDL_UDEV_SYM(udev_hwdb_unref);
-    SDL_UDEV_SYM(udev_hwdb_get_properties_list_entry);
-    SDL_UDEV_SYM(udev_list_entry_get_value);
+    SDL_UDEV_SYM_OPTIONAL(udev_hwdb_new);
+    SDL_UDEV_SYM_OPTIONAL(udev_hwdb_unref);
+    SDL_UDEV_SYM_OPTIONAL(udev_hwdb_get_properties_list_entry);
 
 #undef SDL_UDEV_SYM
 

src/core/linux/SDL_udev.h

@@ -72,6 +72,7 @@ typedef struct SDL_UDEV_Symbols
     int (*udev_enumerate_scan_devices)(struct udev_enumerate *);
     void (*udev_enumerate_unref)(struct udev_enumerate *);
     const char *(*udev_list_entry_get_name)(struct udev_list_entry *);
+    const char *(*udev_list_entry_get_value)(struct udev_list_entry *);
     struct udev_list_entry *(*udev_list_entry_get_next)(struct udev_list_entry *);
     int (*udev_monitor_enable_receiving)(struct udev_monitor *);
     int (*udev_monitor_filter_add_match_subsystem_devtype)(struct udev_monitor *, const char *, const char *);
@@ -87,7 +88,6 @@ typedef struct SDL_UDEV_Symbols
     struct udev_hwdb *(*udev_hwdb_new)(struct udev *udev);
     struct udev_hwdb *(*udev_hwdb_unref)(struct udev_hwdb *hwdb);
     struct udev_list_entry *(*udev_hwdb_get_properties_list_entry)(struct udev_hwdb *hwdb, const char *modalias, unsigned flags);
-    const char *(*udev_list_entry_get_value)(struct udev_list_entry *list_entry);
 
 } SDL_UDEV_Symbols;
 

src/hidapi/linux/hid.c

@@ -916,7 +916,7 @@ static struct hid_device_info * create_device_info_for_device(struct udev_device
 					root = cur_dev;
 				}
 				tmp->next = NULL;
-			
+
 				hid_free_enumeration(tmp);
 			} else {
 				prev_dev = cur_dev;
@@ -1071,7 +1071,7 @@ struct hid_device_info  HID_API_EXPORT *hid_enumerate(unsigned short vendor_id,
 		tmp = create_device_info_for_device(raw_dev);
 
 		if (tmp) {
-			if (!tmp->manufacturer_string) {
+			if (!tmp->manufacturer_string && udev_hwdb_new) {
 				key = "ID_VENDOR_FROM_DATABASE";
 
 				if ((hwdb = udev_hwdb_new(udev)) != NULL) {