diff --git a/llvm/lib/Target/X86/X86AsmPrinter.cpp b/llvm/lib/Target/X86/X86AsmPrinter.cpp
index 920d8d4..069b047 100644
--- a/llvm/lib/Target/X86/X86AsmPrinter.cpp
+++ b/llvm/lib/Target/X86/X86AsmPrinter.cpp
@@ -44,6 +44,10 @@
 #endif
                 );
 
+// Out of line virtual function to home classes.
+void X86DwarfWriter::virtfn() {}
+
+
 /// doInitialization
 bool X86SharedAsmPrinter::doInitialization(Module &M) {
   PrivateGlobalPrefix = ".L";