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-rw-r--r--log-tree.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/log-tree.c b/log-tree.c
index 27afcf6972..d3ae969f60 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -514,6 +514,16 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
return 0;
else if (opt->combine_merges)
return do_diff_combined(opt, commit);
+ else if (opt->first_parent_only) {
+ /*
+ * Generate merge log entry only for the first
+ * parent, showing summary diff of the others
+ * we merged _in_.
+ */
+ diff_tree_sha1(parents->item->object.sha1, sha1, "", &opt->diffopt);
+ log_tree_diff_flush(opt);
+ return !opt->loginfo;
+ }
/* If we show individual diffs, show the parent info */
log->parent = parents->item;