Index: llvm/include/llvm/ADT/DenseMapInfo.h
===================================================================
--- llvm/include/llvm/ADT/DenseMapInfo.h
+++ llvm/include/llvm/ADT/DenseMapInfo.h
@@ -258,7 +258,7 @@
   }
 
   template <unsigned I>
-  static unsigned getHashValueImpl(const Tuple &values, std::true_type) {
+  static unsigned getHashValueImpl(const Tuple &, std::true_type) {
     return 0;
   }
 
@@ -276,7 +276,7 @@
   }
 
   template <unsigned I>
-  static bool isEqualImpl(const Tuple &lhs, const Tuple &rhs, std::true_type) {
+  static bool isEqualImpl(const Tuple &, const Tuple &, std::true_type) {
     return true;
   }
 
Index: llvm/include/llvm/ADT/Hashing.h
===================================================================
--- llvm/include/llvm/ADT/Hashing.h
+++ llvm/include/llvm/ADT/Hashing.h
@@ -656,7 +656,7 @@
 
 template <typename... Ts, std::size_t... Indices>
 hash_code hash_value_tuple_helper(const std::tuple<Ts...> &arg,
-                                  std::index_sequence<Indices...> indices) {
+                                  std::index_sequence<Indices...>) {
   return hash_combine(std::get<Indices>(arg)...);
 }
 
Index: llvm/include/llvm/ADT/Optional.h
===================================================================
--- llvm/include/llvm/ADT/Optional.h
+++ llvm/include/llvm/ADT/Optional.h
@@ -381,7 +381,7 @@
   return X != None;
 }
 
-template <typename T> constexpr bool operator<(const Optional<T> &X, NoneType) {
+template <typename T> constexpr bool operator<(const Optional<T> &, NoneType) {
   return false;
 }
 
Index: llvm/include/llvm/Support/MathExtras.h
===================================================================
--- llvm/include/llvm/Support/MathExtras.h
+++ llvm/include/llvm/Support/MathExtras.h
@@ -398,7 +398,7 @@
   return X < (UINT64_C(1) << (N));
 }
 template <unsigned N>
-constexpr inline std::enable_if_t<N >= 64, bool> isUInt(uint64_t X) {
+constexpr inline std::enable_if_t<N >= 64, bool> isUInt(uint64_t) {
   return true;
 }