Index: clang/include/clang/Basic/DiagnosticDriverKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -368,6 +368,9 @@
 def err_drv_ropi_incompatible_with_cxx : Error<
   "ROPI is not compatible with c++">;
 
+def err_stack_tagging_requires_hardware_feature : Error<
+  "'-fsanitize=memtag' requires hardware support (+memtag)">;
+
 def warn_target_unsupported_nan2008 : Warning<
   "ignoring '-mnan=2008' option because the '%0' architecture does not support it">,
   InGroup<UnsupportedNan>;
Index: clang/lib/Driver/SanitizerArgs.cpp
===================================================================
--- clang/lib/Driver/SanitizerArgs.cpp
+++ clang/lib/Driver/SanitizerArgs.cpp
@@ -1036,6 +1036,12 @@
                                Sanitizers.Mask & CFIClasses)
         << "-fvisibility=";
   }
+
+  if (Sanitizers.has(SanitizerKind::MemTag) &&
+      std::find(CmdArgs.begin(), CmdArgs.end(), StringRef("+mte")) ==
+          CmdArgs.end()) {
+    TC.getDriver().Diag(diag::err_stack_tagging_requires_hardware_feature);
+  }
 }
 
 SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
Index: clang/test/Driver/fsanitize.c
===================================================================
--- clang/test/Driver/fsanitize.c
+++ clang/test/Driver/fsanitize.c
@@ -191,6 +191,13 @@
 // RUN: %clang -target x86_64-linux-android -fsanitize=memtag -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANMT-BAD-ARCH
 // CHECK-SANMT-BAD-ARCH: unsupported option '-fsanitize=memtag' for target
 
+// RUN: %clang -target aarch64-linux -fsanitize=memtag -march=armv8-a+memtag %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANMT-MT
+// CHECK-SANMT-MT: "-target-feature" "+mte"
+// CHECK-SANMT-MT-SAME: "-fsanitize=memtag"
+
+// RUN: %clang -target aarch64-linux -fsanitize=memtag %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANMT-NOMT
+// CHECK-SANMT-NOMT: '-fsanitize=memtag' requires hardware support (+memtag)
+
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fsanitize-address-use-after-scope %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-USE-AFTER-SCOPE
 // RUN: %clang_cl --target=x86_64-windows -fsanitize=address -fsanitize-address-use-after-scope -### -- %s 2>&1 | FileCheck %s --check-prefix=CHECK-USE-AFTER-SCOPE
 // CHECK-USE-AFTER-SCOPE: -cc1{{.*}}-fsanitize-address-use-after-scope