With --no-ff Generate a merge commit even if the merge
resolved as a fast-forward.
---log::
+--log[=<n>]::
--no-log::
In addition to branch names, populate the log message with
- one-line descriptions from the actual commits that are being
- merged.
+ one-line descriptions from at most <n> actual commits that are being
+ merged. See also linkgit:git-fmt-merge-msg[1].
+
With --no-log do not list one-line descriptions from the
actual commits being merged.