Index: lld/trunk/MinGW/Driver.cpp
===================================================================
--- lld/trunk/MinGW/Driver.cpp
+++ lld/trunk/MinGW/Driver.cpp
@@ -184,6 +184,8 @@
     Add("-largeaddressaware");
   if (Args.hasArg(OPT_kill_at))
     Add("-kill-at");
+  if (Args.hasArg(OPT_appcontainer))
+    Add("-appcontainer");
 
   if (Args.getLastArgValue(OPT_m) != "thumb2pe" &&
       Args.getLastArgValue(OPT_m) != "arm64pe" && !Args.hasArg(OPT_dynamicbase))
Index: lld/trunk/MinGW/Options.td
===================================================================
--- lld/trunk/MinGW/Options.td
+++ lld/trunk/MinGW/Options.td
@@ -55,6 +55,7 @@
 // LLD specific options
 def _HASH_HASH_HASH : Flag<["-"], "###">,
     HelpText<"Print (but do not run) the commands to run for this compilation">;
+def appcontainer: F<"appcontainer">, HelpText<"Set the appcontainer flag in the executable">;
 def mllvm: S<"mllvm">;
 def pdb: S<"pdb">, HelpText<"Specify output PDB debug information file">;
 def Xlink : J<"Xlink=">, MetaVarName<"<arg>">,
Index: lld/trunk/test/MinGW/driver.test
===================================================================
--- lld/trunk/test/MinGW/driver.test
+++ lld/trunk/test/MinGW/driver.test
@@ -160,3 +160,7 @@
 NOTIMESTAMP: -timestamp:0
 RUN: ld.lld -### -m i386pep foo.o --no-insert-timestamp --insert-timestamp | FileCheck -check-prefix TIMESTAMP %s
 TIMESTAMP-NOT: -timestamp:0
+
+RUN: ld.lld -### -m i386pep foo.o -appcontainer | FileCheck -check-prefix APPCONTAINER %s
+RUN: ld.lld -### -m i386pep foo.o --appcontainer | FileCheck -check-prefix APPCONTAINER %s
+APPCONTAINER: -appcontainer