diff --git a/gcc/cp/cxx-pretty-print.h b/gcc/cp/cxx-pretty-print.h
index 5080f70a8e4..593bd91d4f7 100644
--- a/gcc/cp/cxx-pretty-print.h
+++ b/gcc/cp/cxx-pretty-print.h
@@ -36,25 +36,25 @@ public:
 
   pretty_printer *clone () const override;
 
-  void constant (tree);
-  void id_expression (tree);
-  void primary_expression (tree);
-  void postfix_expression (tree);
-  void unary_expression (tree);
-  void multiplicative_expression (tree);
-  void conditional_expression (tree);
-  void assignment_expression (tree);
-  void expression (tree);
-  void type_id (tree);
-  void statement (tree);
-  void declaration (tree);
-  void declaration_specifiers (tree);
-  void simple_type_specifier (tree);
-  void function_specifier (tree);
-  void declarator (tree);
-  void direct_declarator (tree);
-  void abstract_declarator (tree);
-  void direct_abstract_declarator (tree);
+  void constant (tree) final override;
+  void id_expression (tree) final override;
+  void primary_expression (tree) final override;
+  void postfix_expression (tree) final override;
+  void unary_expression (tree) final override;
+  void multiplicative_expression (tree) final override;
+  void conditional_expression (tree) final override;
+  void assignment_expression (tree) final override;
+  void expression (tree) final override;
+  void type_id (tree) final override;
+  void statement (tree) final override;
+  void declaration (tree) final override;
+  void declaration_specifiers (tree) final override;
+  void simple_type_specifier (tree) final override;
+  void function_specifier (tree) final override;
+  void declarator (tree) final override;
+  void direct_declarator (tree) final override;
+  void abstract_declarator (tree) final override;
+  void direct_abstract_declarator (tree) final override;
 
   /* This is the enclosing scope of the entity being pretty-printed.  */
   tree enclosing_scope;
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index d1dc73724d1..e93151c98c2 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -1483,10 +1483,10 @@ private:
 
 protected:
   using allocator::grow;
-  virtual char *grow (char *, unsigned needed);
+  char *grow (char *, unsigned needed) final override;
 #if MAPPED_WRITING
   using allocator::shrink;
-  virtual void shrink (char *);
+  void shrink (char *) final override;
 #endif
 
 public:
diff --git a/gcc/genmatch.cc b/gcc/genmatch.cc
index 2b84b849330..a0b22c50ae3 100644
--- a/gcc/genmatch.cc
+++ b/gcc/genmatch.cc
@@ -723,9 +723,9 @@ public:
   bool force_leaf;
   /* If non-zero, the group for optional handling.  */
   unsigned char opt_grp;
-  virtual void gen_transform (FILE *f, int, const char *, bool, int,
-			      const char *, capture_info *,
-			      dt_operand ** = 0, int = 0);
+  void gen_transform (FILE *f, int, const char *, bool, int,
+		      const char *, capture_info *,
+		      dt_operand ** = 0, int = 0) override;
 };
 
 /* An operator that is represented by native C code.  This is always
@@ -757,9 +757,9 @@ public:
   unsigned nr_stmts;
   /* The identifier replacement vector.  */
   vec<id_tab> ids;
-  virtual void gen_transform (FILE *f, int, const char *, bool, int,
-			      const char *, capture_info *,
-			      dt_operand ** = 0, int = 0);
+  void gen_transform (FILE *f, int, const char *, bool, int,
+		      const char *, capture_info *,
+		      dt_operand ** = 0, int = 0) final override;
 };
 
 /* A wrapper around another operand that captures its value.  */
@@ -778,9 +778,9 @@ public:
   bool value_match;
   /* The captured value.  */
   operand *what;
-  virtual void gen_transform (FILE *f, int, const char *, bool, int,
-			      const char *, capture_info *,
-			      dt_operand ** = 0, int = 0);
+  void gen_transform (FILE *f, int, const char *, bool, int,
+		      const char *, capture_info *,
+		      dt_operand ** = 0, int = 0) final override;
 };
 
 /* if expression.  */
@@ -1655,7 +1655,7 @@ public:
       : dt_node (type, parent_), op (op_), match_dop (match_dop_),
       pos (pos_), value_match (false), for_id (current_id) {}
 
-  void gen (FILE *, int, bool, int);
+  void gen (FILE *, int, bool, int) final override;
   unsigned gen_predicate (FILE *, int, const char *, bool);
   unsigned gen_match_op (FILE *, int, const char *, bool);
 
@@ -1681,7 +1681,7 @@ public:
 	  indexes (indexes_), info (NULL)  {}
 
   void gen_1 (FILE *, int, bool, operand *);
-  void gen (FILE *f, int, bool, int);
+  void gen (FILE *f, int, bool, int) final override;
 };
 
 template<>
diff --git a/gcc/gensupport.cc b/gcc/gensupport.cc
index 42680499d86..8fcacf8f9d2 100644
--- a/gcc/gensupport.cc
+++ b/gcc/gensupport.cc
@@ -2310,7 +2310,7 @@ class gen_reader : public rtx_reader
 {
  public:
   gen_reader () : rtx_reader (false) {}
-  void handle_unknown_directive (file_location, const char *);
+  void handle_unknown_directive (file_location, const char *) final override;
 };
 
 void
diff --git a/gcc/gimple-range-cache.h b/gcc/gimple-range-cache.h
index 555fe32513f..d768f418f0d 100644
--- a/gcc/gimple-range-cache.h
+++ b/gcc/gimple-range-cache.h
@@ -77,8 +77,8 @@ public:
   ranger_cache (int not_executable_flag, bool use_imm_uses);
   ~ranger_cache ();
 
-  virtual bool range_of_expr (irange &r, tree name, gimple *stmt);
-  virtual bool range_on_edge (irange &r, edge e, tree expr);
+  bool range_of_expr (irange &r, tree name, gimple *stmt) final override;
+  bool range_on_edge (irange &r, edge e, tree expr) final override;
   bool block_range (irange &r, basic_block bb, tree name, bool calc = true);
 
   bool get_global_range (irange &r, tree name) const;
diff --git a/gcc/ipa-icf-gimple.h b/gcc/ipa-icf-gimple.h
index 1545e4a5905..8f498b31eef 100644
--- a/gcc/ipa-icf-gimple.h
+++ b/gcc/ipa-icf-gimple.h
@@ -282,11 +282,13 @@ private:
 public:
   /* Return true if two operands are equal.  The flags fields can be used
      to specify OEP flags described above.  */
-  virtual bool operand_equal_p (const_tree, const_tree, unsigned int flags);
+  bool operand_equal_p (const_tree, const_tree, unsigned int flags)
+    final override;
 
   /* Generate a hash value for an expression.  This can be used iteratively
      by passing a previous result as the HSTATE argument.  */
-  virtual void hash_operand (const_tree, inchash::hash &, unsigned flags);
+  void hash_operand (const_tree, inchash::hash &, unsigned flags)
+    final override;
   void hash_operand (const_tree, inchash::hash &, unsigned flags,
 		     operand_access_type access);
 };
diff --git a/gcc/ipa-icf.h b/gcc/ipa-icf.h
index dbae2cca02b..bb550923ad4 100644
--- a/gcc/ipa-icf.h
+++ b/gcc/ipa-icf.h
@@ -317,16 +317,18 @@ public:
 
   ~sem_function ();
 
-  virtual void init (ipa_icf_gimple::func_checker *);
-  virtual bool equals_wpa (sem_item *item,
-			   hash_map <symtab_node *, sem_item *> &ignored_nodes);
-  virtual hashval_t get_hash (void);
-  virtual bool equals (sem_item *item,
-		       hash_map <symtab_node *, sem_item *> &ignored_nodes);
-  virtual bool merge (sem_item *alias_item);
+  void init (ipa_icf_gimple::func_checker *) final override;
+  bool equals_wpa (sem_item *item,
+		   hash_map <symtab_node *, sem_item *> &ignored_nodes)
+    final override;
+  hashval_t get_hash (void) final override;
+  bool equals (sem_item *item,
+	       hash_map <symtab_node *, sem_item *> &ignored_nodes)
+    final override;
+  bool merge (sem_item *alias_item) final override;
 
   /* Dump symbol to FILE.  */
-  virtual void dump_to_file (FILE *file)
+  void dump_to_file (FILE *file) final override
   {
     gcc_assert (file);
     dump_function_to_file (decl, file, TDF_DETAILS);
@@ -426,17 +428,19 @@ public:
   sem_variable (varpool_node *_node, bitmap_obstack *stack);
 
   /* Semantic variable initialization function.  */
-  virtual void init (ipa_icf_gimple::func_checker *);
+  void init (ipa_icf_gimple::func_checker *) final override;
 
-  virtual hashval_t get_hash (void);
-  virtual bool merge (sem_item *alias_item);
-  virtual void dump_to_file (FILE *file);
-  virtual bool equals (sem_item *item,
-		       hash_map <symtab_node *, sem_item *> &ignored_nodes);
+  hashval_t get_hash (void) final override;
+  bool merge (sem_item *alias_item) final override;
+  void dump_to_file (FILE *file) final override;
+  bool equals (sem_item *item,
+	       hash_map <symtab_node *, sem_item *> &ignored_nodes)
+    final override;
 
   /* Fast equality variable based on knowledge known in WPA.  */
-  virtual bool equals_wpa (sem_item *item,
-			   hash_map <symtab_node *, sem_item *> &ignored_nodes);
+  bool equals_wpa (sem_item *item,
+		   hash_map <symtab_node *, sem_item *> &ignored_nodes)
+     final override;
 
   /* Returns varpool_node.  */
   inline varpool_node *get_node (void)
diff --git a/gcc/lto/lto-dump.cc b/gcc/lto/lto-dump.cc
index 1fb3fb86fb5..f88486b5143 100644
--- a/gcc/lto/lto-dump.cc
+++ b/gcc/lto/lto-dump.cc
@@ -80,7 +80,7 @@ public:
   virtual ~variable_entry ()
   {}
 
-  virtual size_t get_size () const
+  size_t get_size () const final override
   {
     varpool_node *vnode = dyn_cast<varpool_node *> (node);
     if (DECL_SIZE (vnode->decl) && tree_fits_shwi_p (DECL_SIZE (vnode->decl)))
@@ -88,7 +88,7 @@ public:
     return 0;
   }
 
-  virtual void dump ()
+  void dump () final override
   {
     symbol_entry :: dump ();
     varpool_node *vnode = dyn_cast<varpool_node *> (node);
@@ -111,13 +111,13 @@ public:
   virtual ~function_entry ()
   {}
 
-  virtual void dump ()
+  void dump () final override
   {
     symbol_entry :: dump ();
     printf ("\n");
   }
 
-  virtual size_t get_size () const
+  size_t get_size () const final override
   {
     cgraph_node *cnode = dyn_cast<cgraph_node *> (node);
     gcc_assert (cnode);
diff --git a/gcc/read-md.h b/gcc/read-md.h
index 34a64fa93a2..7d8cd4a8336 100644
--- a/gcc/read-md.h
+++ b/gcc/read-md.h
@@ -330,7 +330,7 @@ class noop_reader : public md_reader
   noop_reader () : md_reader (false) {}
 
   /* A dummy implementation which skips unknown directives.  */
-  void handle_unknown_directive (file_location, const char *);
+  void handle_unknown_directive (file_location, const char *) override;
 };
 
 /* An md_reader subclass that actually handles full hierarchical
diff --git a/gcc/read-rtl-function.cc b/gcc/read-rtl-function.cc
index eacbe4c1200..3bcff1540e7 100644
--- a/gcc/read-rtl-function.cc
+++ b/gcc/read-rtl-function.cc
@@ -188,7 +188,7 @@ class fixup_insn_uid : public operand_fixup
       m_insn_uid (insn_uid)
   {}
 
-  void apply (function_reader *reader) const;
+  void apply (function_reader *reader) const final override;
 
  private:
   int m_insn_uid;
@@ -206,7 +206,7 @@ class fixup_note_insn_basic_block : public operand_fixup
       m_bb_idx (bb_idx)
   {}
 
-  void apply (function_reader *reader) const;
+  void apply (function_reader *reader) const final override;
 
  private:
   int m_bb_idx;
@@ -225,7 +225,7 @@ class fixup_expr : public fixup
 
   ~fixup_expr () { free (m_desc); }
 
-  void apply (function_reader *reader) const;
+  void apply (function_reader *reader) const final override;
 
  private:
   char *m_desc;
diff --git a/gcc/tree-ssa-loop-ch.cc b/gcc/tree-ssa-loop-ch.cc
index 9ab63d1fa0c..d1391940c2b 100644
--- a/gcc/tree-ssa-loop-ch.cc
+++ b/gcc/tree-ssa-loop-ch.cc
@@ -320,7 +320,7 @@ public:
 
 protected:
   /* ch_base method: */
-  virtual bool process_loop_p (class loop *loop);
+  bool process_loop_p (class loop *loop) final override;
 }; // class pass_ch
 
 const pass_data pass_data_ch_vect =
@@ -358,7 +358,7 @@ public:
 
 protected:
   /* ch_base method: */
-  virtual bool process_loop_p (class loop *loop);
+  bool process_loop_p (class loop *loop) final override;
 }; // class pass_ch_vect
 
 /* For all loops, copy the condition at the end of the loop body in front
diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 7407591e98c..b2f35a5fb55 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -2534,9 +2534,9 @@ public:
     : eliminate_dom_walker (CDI_DOMINATORS, NULL), entry (entry_),
       m_avail_freelist (NULL) {}
 
-  virtual tree eliminate_avail (basic_block, tree op);
+  tree eliminate_avail (basic_block, tree op) final override;
 
-  virtual void eliminate_push_avail (basic_block, tree);
+  void eliminate_push_avail (basic_block, tree) final override;
 
   basic_block entry;
   /* Freelist of avail entries which are allocated from the vn_ssa_aux
