Index: COFF/Options.td
===================================================================
--- COFF/Options.td
+++ COFF/Options.td
@@ -93,6 +93,25 @@
 def lldmap : Joined<["/", "-"], "lldmap:">;
 
 //==============================================================================
+// The flags below provide aliases. They are defined for ld compatibility.
+//==============================================================================
+
+def o : Separate<["-"], "o">, Alias<out>;
+def L : Joined<["-"], "L">, Alias<libpath>;
+def e : Separate<["-"], "e">, Alias<entry>;
+def subs : Separate<["--"], "subsystem">, Alias<subsystem>;
+
+def Bdynamic: Flag<["-"], "Bdynamic">,
+  HelpText<"Link against shared libraries">;
+
+def Bstatic: Flag<["-"], "Bstatic">,
+  HelpText<"Do not link against shared libraries">;
+
+// Used to override gnu pe targets
+def m : Separate<["-"], "m">, MetaVarName<"<emulation>">,
+     HelpText<"Select target emulation">;
+
+//==============================================================================
 // The flags below do nothing. They are defined only for link.exe compatibility.
 //==============================================================================