ld.lld.1: explain long options may use one or two dashes
Obtained from FreeBSD r329003
git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@370800 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ld.lld.1 b/docs/ld.lld.1
index 91bcae3..74a5140 100644
--- a/docs/ld.lld.1
+++ b/docs/ld.lld.1
@@ -40,6 +40,17 @@
.Nm
as a native linker as well as a cross linker.
.Sh OPTIONS
+Many options have both a single-letter and long form.
+When using the long form options other than those beginning with the
+letter
+.Cm o
+may be specified using either one or two dashes preceding the option name.
+Long options beginning with
+.Cm o
+require two dashes to avoid confusion with the
+.Fl o Ar path
+option.
+.Pp
.Bl -tag -width indent
.It Fl -allow-multiple-definition
Do not error if a symbol is defined multiple times.
