/* if the entry is not checked out, don't examine work tree */
cached = o->index_only ||
(idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx)));
- /*
- * Backward compatibility wart - "diff-index -m" does
- * not mean "do not ignore merges", but "match_missing".
- *
- * But with the revision flag parsing, that's found in
- * "!revs->ignore_merges".
- */
- match_missing = !revs->ignore_merges;
+
+ match_missing = revs->match_missing;
if (cached && idx && ce_stage(idx)) {
struct diff_filepair *pair;
revs->diffopt.flags.recursive = 1;
revs->diffopt.flags.tree_in_recursive = 1;
} else if (!strcmp(arg, "-m")) {
+ /*
+ * To "diff-index", "-m" means "match missing", and to the "log"
+ * family of commands, it means "show full diff for merges". Set
+ * both fields appropriately.
+ */
revs->ignore_merges = 0;
+ revs->match_missing = 1;
} else if ((argcount = parse_long_opt("diff-merges", argv, &optarg))) {
if (!strcmp(optarg, "off")) {
revs->ignore_merges = 1;