diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -704,6 +704,8 @@
     endif()
     if (USE_SANITIZER STREQUAL "Address")
       append_flags(SANITIZER_FLAGS "-fsanitize=address")
+    elseif (USE_SANITIZER STREQUAL "HWAddress")
+      append_flags(SANITIZER_FLAGS "-fsanitize=hwaddress")
     elseif (USE_SANITIZER MATCHES "Memory(WithOrigins)?")
       append_flags(SANITIZER_FLAGS -fsanitize=memory)
       if (USE_SANITIZER STREQUAL "MemoryWithOrigins")
@@ -714,6 +716,9 @@
     elseif (USE_SANITIZER STREQUAL "Address;Undefined" OR
             USE_SANITIZER STREQUAL "Undefined;Address")
       append_flags(SANITIZER_FLAGS "-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all")
+    elseif (USE_SANITIZER STREQUAL "HWAddress;Undefined" OR
+            USE_SANITIZER STREQUAL "Undefined;HWAddress")
+      append_flags(SANITIZER_FLAGS "-fsanitize=hwaddress,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all")
     elseif (USE_SANITIZER STREQUAL "Thread")
       append_flags(SANITIZER_FLAGS -fsanitize=thread)
     elseif (USE_SANITIZER STREQUAL "DataFlow")