Index: lib/Driver/SanitizerArgs.cpp
===================================================================
--- lib/Driver/SanitizerArgs.cpp
+++ lib/Driver/SanitizerArgs.cpp
@@ -32,7 +32,7 @@
   RequiresPIE = DataFlow,
   NeedsUnwindTables = Address | Thread | Memory | DataFlow,
   SupportsCoverage = Address | KernelAddress | Memory | Leak | Undefined |
-                     Integer | Nullability | DataFlow,
+                     Integer | Nullability | DataFlow | Fuzzer,
   RecoverableByDefault = Undefined | Integer | Nullability,
   Unrecoverable = Unreachable | Return,
   LegacyFsanitizeRecoverMask = Undefined | Integer,
Index: test/Driver/fuzzer.c
===================================================================
--- test/Driver/fuzzer.c
+++ test/Driver/fuzzer.c
@@ -15,6 +15,10 @@
 //
 // CHECK-LIBCXX-DARWIN: -lc++
 
+// RUN: %clang -fsanitize=fuzzer -fsanitize-coverage=trace-pc %s -### 2>&1 | FileCheck --check-prefixes=CHECK-MSG %s
+//
+// CHECK-MSG-NOT: argument unused during compilation
+
 int LLVMFuzzerTestOneInput(const char *Data, long Size) {
   return 0;
 }