#define DIFF_OPT_DIFF_FROM_CONTENTS (1 << 22)
#define DIFF_OPT_SUBMODULE_LOG (1 << 23)
#define DIFF_OPT_DIRTY_SUBMODULES (1 << 24)
+#define DIFF_OPT_IGNORE_UNTRACKED_IN_SUBMODULES (1 << 25)
#define DIFF_OPT_TST(opts, flag) ((opts)->flags & DIFF_OPT_##flag)
#define DIFF_OPT_SET(opts, flag) ((opts)->flags |= DIFF_OPT_##flag)