+/*
+ * Has a file changed or has a submodule new commits or a dirty work tree?
+ *
+ * Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
+ * option is set, the caller does not only want to know if a submodule is
+ * modified at all but wants to know all the conditions that are met (new
+ * commits, untracked content and/or modified content).
+ */
+static int match_stat_with_submodule(struct diff_options *diffopt,
+ struct cache_entry *ce, struct stat *st,
+ unsigned ce_option, unsigned *dirty_submodule)
+{
+ int changed = ce_match_stat(ce, st, ce_option);
+ if (S_ISGITLINK(ce->ce_mode)) {
+ unsigned orig_flags = diffopt->flags;
+ if (!DIFF_OPT_TST(diffopt, OVERRIDE_SUBMODULE_CONFIG))
+ set_diffopt_flags_from_submodule_config(diffopt, ce->name);
+ if (DIFF_OPT_TST(diffopt, IGNORE_SUBMODULES))
+ changed = 0;
+ else if (!DIFF_OPT_TST(diffopt, IGNORE_DIRTY_SUBMODULES)
+ && (!changed || DIFF_OPT_TST(diffopt, DIRTY_SUBMODULES)))
+ *dirty_submodule = is_submodule_modified(ce->name, DIFF_OPT_TST(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES));
+ diffopt->flags = orig_flags;
+ }
+ return changed;
+}
+