Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -4630,6 +4630,8 @@
   AliasArgs<["no-sign-compare"]>;
 def _SLASH_wd4100 : CLFlag<"wd4100">, Alias<W_Joined>,
   AliasArgs<["no-unused-parameter"]>;
+def _SLASH_wd4101 : CLFlag<"wd4101">, Alias<W_Joined>,
+  AliasArgs<["no-unused-variable"]>;
 def _SLASH_wd4910 : CLFlag<"wd4910">, Alias<W_Joined>,
   AliasArgs<["no-dllexport-explicit-instantiation-decl"]>;
 def _SLASH_wd4996 : CLFlag<"wd4996">, Alias<W_Joined>,
Index: clang/test/Driver/cl-options.c
===================================================================
--- clang/test/Driver/cl-options.c
+++ clang/test/Driver/cl-options.c
@@ -330,10 +330,11 @@
 // CHECK-CHAR8_T_: "-fno-char8_t"
 
 // For some warning ids, we can map from MSVC warning to Clang warning.
-// RUN: %clang_cl -wd4005 -wd4100 -wd4910 -wd4996 -### -- %s 2>&1 | FileCheck -check-prefix=Wno %s
+// RUN: %clang_cl -wd4005 -wd4100 -wd4101 -wd4910 -wd4996 -### -- %s 2>&1 | FileCheck -check-prefix=Wno %s
 // Wno: "-cc1"
 // Wno: "-Wno-macro-redefined"
 // Wno: "-Wno-unused-parameter"
+// Wno: "-Wno-unused-variable"
 // Wno: "-Wno-dllexport-explicit-instantiation-decl"
 // Wno: "-Wno-deprecated-declarations"