Index: llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
+++ llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
@@ -588,6 +588,9 @@
   else()
     message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.")
   endif()
+  if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?")
+    append("-fsanitize-address-use-after-scope" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  endif()
   if (LLVM_USE_SANITIZE_COVERAGE)
     append("-fsanitize-coverage=trace-pc-guard,indirect-calls,trace-cmp" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   endif()