Merge pull request #364 from grissiom/romfs-next

romfs: declare the dummy entry as weak

components/dfs/filesystems/romfs/romfs.c

@@ -21,6 +21,7 @@
  * Date           Author       Notes
  */
 
+#include <rtthread.h>
 #include <dfs_romfs.h>
 
 const static unsigned char _dummy_dummy_txt[] =
@@ -38,13 +39,13 @@ const static unsigned char _dummy_txt[] =
     0x74,0x68,0x69,0x73,0x20,0x69,0x73,0x20,0x61,0x20,0x66,0x69,0x6c,0x65,0x21,0x0d,0x0a,
 };
 
-const struct romfs_dirent _root_dirent[] =
+const struct romfs_dirent WEAK _root_dirent[] =
 {
     {ROMFS_DIRENT_DIR, "dummy", (rt_uint8_t *)_dummy, sizeof(_dummy)/sizeof(_dummy[0])},
     {ROMFS_DIRENT_FILE, "dummy.txt", _dummy_txt, sizeof(_dummy_txt)},
 };
 
-const struct romfs_dirent romfs_root =
+const struct romfs_dirent WEAK romfs_root =
 {
     ROMFS_DIRENT_DIR, "/", (rt_uint8_t *)_root_dirent, sizeof(_root_dirent)/sizeof(_root_dirent[0])
 };