Index: lib/Target/ARM/MCTargetDesc/ARMMCAsmInfo.cpp
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMMCAsmInfo.cpp
+++ lib/Target/ARM/MCTargetDesc/ARMMCAsmInfo.cpp
@@ -90,6 +90,7 @@
 
   PrivateGlobalPrefix = "$M";
   PrivateLabelPrefix = "$M";
+  CommentString = "@";
 }
 
 void ARMCOFFMCAsmInfoGNU::anchor() { }