re PR c/7652 (-Wswitch-break : Warn if a switch case falls through)

	PR c/7652
gcc/
	* alias.c (find_base_value): Adjust fall through comment.
	* cfgexpand.c (expand_debug_expr): Likewise.
	* combine.c (find_split_point): Likewise.
	(expand_compound_operation): Likewise.  Add FALLTHRU.
	(make_compound_operation): Adjust fall through comment.
	(canon_reg_for_combine): Add FALLTHRU.
	(force_to_mode): Adjust fall through comment.
	(simplify_shift_const_1): Likewise.
	(simplify_comparison): Likewise.
	* config/aarch64/aarch64-builtins.c (aarch64_simd_expand_args): Add
	FALLTHRU.
	* config/aarch64/predicates.md: Likewise.
	* config/i386/i386.c (function_arg_advance_32): Likewise.
	(ix86_gimplify_va_arg): Likewise.
	(print_reg): Likewise.
	(ix86_print_operand): Likewise.
	(ix86_build_const_vector): Likewise.
	(ix86_expand_branch): Likewise.
	(ix86_sched_init_global): Adjust fall through comment.
	(ix86_expand_args_builtin): Add FALLTHRU.
	(ix86_expand_builtin): Likewise.
	(ix86_expand_vector_init_one_var): Likewise.
	* config/rs6000/rs6000.c (rs6000_emit_vector_compare_inner): Likewise.
	(rs6000_adjust_cost): Likewise.
	(insn_must_be_first_in_group): Likewise.
	* config/rs6000/rs6000.md: Likewise.  Adjust fall through comment.
	* dbxout.c (dbxout_symbol): Adjust fall through comment.
	* df-scan.c (df_uses_record): Likewise.
	* dojump.c (do_jump): Add FALLTHRU.
	* dwarf2out.c (mem_loc_descriptor): Likewise.  Adjust fall through
	comment.
	(resolve_args_picking_1): Adjust fall through comment.
	(loc_list_from_tree_1): Likewise.
	* expmed.c (make_tree): Likewise.
	* expr.c (expand_expr_real_2): Add FALLTHRU.
	(expand_expr_real_1): Likewise.  Adjust fall through comment.
	* fold-const.c (const_binop): Adjust fall through comment.
	(fold_truth_not_expr): Likewise.
	(fold_cond_expr_with_comparison): Add FALLTHRU.
	(fold_binary_loc): Likewise.
	(contains_label_1): Adjust fall through comment.
	(multiple_of_p): Likewise.
	* gcov-tool.c (process_args): Add FALLTHRU.
	* genattrtab.c (check_attr_test): Likewise.
	(write_test_expr): Likewise.
	* genconfig.c (walk_insn_part): Likewise.
	* genpreds.c (validate_exp): Adjust fall through comment.
	(needs_variable): Likewise.
	* gensupport.c (get_alternatives_number): Add FALLTHRU.
	(subst_dup): Likewise.
	* gimple-pretty-print.c (dump_gimple_assign): Likewise.
	* gimplify.c (gimplify_addr_expr): Adjust fall through comment.
	(gimplify_scan_omp_clauses): Add FALLTHRU.
	(goa_stabilize_expr): Likewise.
	* graphite-isl-ast-to-gimple.c (substitute_ssa_name): Adjust fall
	through comment.
	* hsa-gen.c (get_address_from_value): Likewise.
	* ipa-icf.c (sem_function::hash_stmt): Likewise.
	* ira.c (ira_setup_alts): Add FALLTHRU.
	* lra-eliminations.c (lra_eliminate_regs_1): Adjust fall through
	comment.
	* lto-streamer-out.c (lto_output_tree_ref): Add FALLTHRU.
	* opts.c (common_handle_option): Likewise.
	* read-rtl.c (read_rtx_code): Likewise.
	* real.c (round_for_format): Likewise.
	* recog.c (asm_operand_ok): Likewise.
	* reginfo.c (reg_scan_mark_refs): Adjust fall through comment.
	* reload1.c (set_label_offsets): Likewise.
	(eliminate_regs_1): Likewise.
	(reload_reg_reaches_end_p): Likewise.
	* rtlanal.c (commutative_operand_precedence): Add FALLTHRU.
	(rtx_cost): Likewise.
	* sched-rgn.c (is_exception_free): Likewise.
	* simplify-rtx.c (simplify_rtx): Adjust fall through comment.
	* stor-layout.c (int_mode_for_mode): Likewise.
	* toplev.c (print_to_asm_out_file): Likewise.
	(print_to_stderr): Likewise.
	* tree-cfg.c (gimple_verify_flow_info): Likewise.
	* tree-chrec.c (chrec_fold_plus_1): Add FALLTHRU.
	(chrec_fold_multiply): Likewise.
	(evolution_function_is_invariant_rec_p): Likewise.
	(for_each_scev_op): Likewise.
	* tree-data-ref.c (siv_subscript_p): Likewise.
	(get_references_in_stmt): Likewise.
	* tree.c (find_placeholder_in_expr): Adjust fall through comment.
	(substitute_in_expr): Likewise.
	(type_cache_hasher::equal): Likewise.
	(walk_type_fields): Likewise.
	* var-tracking.c (adjust_mems): Add FALLTHRU.
	(set_dv_changed): Adjust fall through comment.
	* varasm.c (default_function_section): Add FALLTHRU.
gcc/c-family/
	* c-common.c (scalar_to_vector): Adjust fall through comment.
	* c-opts.c (c_common_handle_option): Likewise.
	* c-pragma.c (handle_pragma_pack): Add FALLTHRU.
	* c-pretty-print.c (c_pretty_printer::postfix_expression): Adjust
	fall through comment.
	* cilk.c (extract_free_variables): Add FALLTHRU.
gcc/c/
	* c-parser.c (c_parser_external_declaration): Add FALLTHRU.
	(c_parser_postfix_expression): Likewise.
	* c-typeck.c (build_unary_op): Adjust fall through comment.
	(c_mark_addressable): Likewise.
gcc/cp/
	* call.c (add_builtin_candidate): Add FALLTHRU.
	(build_integral_nontype_arg_conv): Adjust fall through comment.
	(build_new_op_1): Add FALLTHRU.
	(convert_like_real): Adjust fall through comment.
	* class.c (fixed_type_or_null): Likewise.
	* constexpr.c (cxx_eval_constant_expression): Likewise.
	(potential_constant_expression_1): Likewise.  Add FALLTHRU.
	* cp-gimplify.c (cp_gimplify_expr): Adjust fall through comment.
	(cp_fold): Add FALLTHRU.
	* cvt.c (build_expr_type_conversion): Adjust fall through comment.
	* cxx-pretty-print.c (pp_cxx_unqualified_id): Add FALLTHRU.
	(pp_cxx_qualified_id): Likewise.
	(cxx_pretty_printer::constant): Adjust fall through comment.
	(cxx_pretty_printer::primary_expression): Add FALLTHRU.
	(pp_cxx_pm_expression): Adjust fall through comment.
	(cxx_pretty_printer::expression): Add FALLTHRU.
	(cxx_pretty_printer::declaration_specifiers): Reformat code.
	(pp_cxx_type_specifier_seq): Adjust fall through comment.
	(pp_cxx_ptr_operator): Likewise.  Add FALLTHRU.
	* error.c (dump_type): Adjust fall through comment.
	(dump_decl): Likewise.
	* mangle.c (write_type): Likewise.
	* method.c (synthesized_method_walk): Add FALLTHRU.
	* name-lookup.c (arg_assoc_type): Likewise.
	* parser.c (cp_lexer_print_token): Adjust fall through comment.
	(cp_parser_primary_expression): Add FALLTHRU.
	(cp_parser_operator): Likewise.
	* pt.c (find_parameter_packs_r): Likewise.
	(tsubst_aggr_type): Adjust fall through comment.
	* semantics.c (finish_omp_clauses): Add FALLTHRU.
	* tree.c (lvalue_kind): Likewise.
gcc/fortran/
	* decl.c (match_attr_spec): Add FALLTHRU.
	* primary.c (match_arg_list_function): Likewise.
	* resolve.c (resolve_operator): Adjust fall through comment.
	(fixup_charlen): Add FALLTHRU.
	(resolve_allocate_expr): Adjust fall through comment.
	* trans-array.c (gfc_conv_ss_startstride): Add FALLTHRU.
	* trans-intrinsic.c (gfc_conv_intrinsic_len): Adjust fall through
	comment.
gcc/java/
	* expr.c (java_truthvalue_conversion): Adjust fall through comment.
	* jcf-io.c (verify_constant_pool): Likewise.
	* typeck.c (promote_type): Likewise.
gcc/objc/
	* objc-encoding.c (encode_type): Add FALLTHRU.
libcpp/
	* lex.c (search_line_fast): Add FALLTHRU.
	(_cpp_lex_direct): Likewise.
	(cpp_token_val_index): Adjust fall through comment.
	* macro.c (parse_params): Add FALLTHRU.
	* pch.c (count_defs): Adjust fall through comment.
	(write_defs): Likewise.
libiberty/
	* cp-demangle.c (d_print_mod): Add FALLTHRU.

From-SVN: r239410

15 files changed, 78 insertions, 18 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 4049c76..52965b8 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,38 @@
+2016-08-12  Marek Polacek  <polacek@redhat.com>
+
+	PR c/7652
+	* call.c (add_builtin_candidate): Add FALLTHRU.
+	(build_integral_nontype_arg_conv): Adjust fall through comment.
+	(build_new_op_1): Add FALLTHRU.
+	(convert_like_real): Adjust fall through comment.
+	* class.c (fixed_type_or_null): Likewise.
+	* constexpr.c (cxx_eval_constant_expression): Likewise.
+	(potential_constant_expression_1): Likewise.  Add FALLTHRU.
+	* cp-gimplify.c (cp_gimplify_expr): Adjust fall through comment.
+	(cp_fold): Add FALLTHRU.
+	* cvt.c (build_expr_type_conversion): Adjust fall through comment.
+	* cxx-pretty-print.c (pp_cxx_unqualified_id): Add FALLTHRU.
+	(pp_cxx_qualified_id): Likewise.
+	(cxx_pretty_printer::constant): Adjust fall through comment.
+	(cxx_pretty_printer::primary_expression): Add FALLTHRU.
+	(pp_cxx_pm_expression): Adjust fall through comment.
+	(cxx_pretty_printer::expression): Add FALLTHRU.
+	(cxx_pretty_printer::declaration_specifiers): Reformat code.
+	(pp_cxx_type_specifier_seq): Adjust fall through comment.
+	(pp_cxx_ptr_operator): Likewise.  Add FALLTHRU.
+	* error.c (dump_type): Adjust fall through comment.
+	(dump_decl): Likewise.
+	* mangle.c (write_type): Likewise.
+	* method.c (synthesized_method_walk): Add FALLTHRU.
+	* name-lookup.c (arg_assoc_type): Likewise.
+	* parser.c (cp_lexer_print_token): Adjust fall through comment.
+	(cp_parser_primary_expression): Add FALLTHRU.
+	(cp_parser_operator): Likewise.
+	* pt.c (find_parameter_packs_r): Likewise.
+	(tsubst_aggr_type): Adjust fall through comment.
+	* semantics.c (finish_omp_clauses): Add FALLTHRU.
+	* tree.c (lvalue_kind): Likewise.
+
 2016-08-12  Alexandre Oliva <aoliva@redhat.com>
 
 	PR debug/63240
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 918661a..0203cd1 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -2421,6 +2421,7 @@ add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
     case PREDECREMENT_EXPR:
       if (TREE_CODE (type1) == BOOLEAN_TYPE)
 	return;
+      /* FALLTHRU */
     case POSTINCREMENT_EXPR:
     case PREINCREMENT_EXPR:
       if (ARITHMETIC_TYPE_P (type1) || TYPE_PTROB_P (type1))
@@ -2457,6 +2458,7 @@ add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
     case UNARY_PLUS_EXPR: /* unary + */
       if (TYPE_PTR_P (type1))
 	break;
+      /* FALLTHRU */
     case NEGATE_EXPR:
       if (ARITHMETIC_TYPE_P (type1))
 	break;
@@ -2594,6 +2596,7 @@ add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
     case PLUS_EXPR:
       if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
 	break;
+      /* FALLTHRU */
     case ARRAY_REF:
       if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && TYPE_PTROB_P (type2))
 	{
@@ -2674,6 +2677,7 @@ add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
 	      type2 = ptrdiff_type_node;
 	      break;
 	    }
+	  /* FALLTHRU */
 	case MULT_EXPR:
 	case TRUNC_DIV_EXPR:
 	  if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
@@ -3966,7 +3970,7 @@ build_integral_nontype_arg_conv (tree type, tree expr, tsubst_flags_t complain)
 	if (complain & tf_error)
 	  error_at (loc, "conversion from %qT to %qT not considered for "
 		    "non-type template argument", t, type);
-	/* and fall through.  */
+	/* fall through.  */
 
       default:
 	conv = NULL;
@@ -5493,6 +5497,7 @@ build_new_op_1 (location_t loc, enum tree_code code, int flags, tree arg1,
     case MODIFY_EXPR:
       if (code2 != NOP_EXPR)
 	break;
+      /* FALLTHRU */
     case COMPONENT_REF:
     case ARRAY_REF:
       memonly = true;
@@ -6661,7 +6666,7 @@ convert_like_real (conversion *convs, tree expr, tree fn, int argnum,
 
       if (! MAYBE_CLASS_TYPE_P (totype))
 	return expr;
-      /* Else fall through.  */
+      /* Fall through.  */
     case ck_base:
       if (convs->kind == ck_base && !convs->need_temporary_p)
 	{
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 10286a7..3ad1b89 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -7413,7 +7413,7 @@ fixed_type_or_null (tree instance, int *nonnull, int *cdtorp)
 	    *nonnull = 1;
 	  return TREE_TYPE (TREE_TYPE (instance));
 	}
-      /* fall through...  */
+      /* fall through.  */
     case TARGET_EXPR:
     case PARM_DECL:
     case RESULT_DECL:
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index cb0fdee..5d97a4b 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -3699,7 +3699,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
       if (is_capture_proxy (t))
 	return cxx_eval_constant_expression (ctx, DECL_VALUE_EXPR (t),
 					     lval, non_constant_p, overflow_p);
-      /* else fall through.  */
+      /* fall through */
     case CONST_DECL:
       /* We used to not check lval for CONST_DECL, but darwin.c uses
 	 CONST_DECL for aggregate constants.  */
@@ -3988,7 +3988,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
 					    overflow_p);
       if (r)
 	break;
-      /* else fall through */
+      /* fall through */
 
     case PLUS_EXPR:
     case MINUS_EXPR:
@@ -5167,7 +5167,7 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict,
       /* A destructor.  */
       if (TYPE_P (TREE_OPERAND (t, 0)))
 	return true;
-      /* else fall through.  */
+      /* fall through.  */
 
     case REALPART_EXPR:
     case IMAGPART_EXPR:
@@ -5269,6 +5269,7 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict,
 	    }
 	  return false;
 	}
+      /* FALLTHRU */
     case INIT_EXPR:
       return RECUR (TREE_OPERAND (t, 1), rval);
 
diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c
index e28c9df..6d514d0 100644
--- a/gcc/cp/cp-gimplify.c
+++ b/gcc/cp/cp-gimplify.c
@@ -659,7 +659,7 @@ cp_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
       cp_gimplify_init_expr (expr_p);
       if (TREE_CODE (*expr_p) != INIT_EXPR)
 	return GS_OK;
-      /* Otherwise fall through.  */
+      /* Fall through.  */
     case MODIFY_EXPR:
     modify_expr_case:
       {
@@ -2068,6 +2068,7 @@ cp_fold (tree x)
 
     case VIEW_CONVERT_EXPR:
       rval_ops = false;
+      /* FALLTHRU */
     case CONVERT_EXPR:
     case NOP_EXPR:
     case NON_LVALUE_EXPR:
@@ -2116,6 +2117,7 @@ cp_fold (tree x)
     case REALPART_EXPR:
     case IMAGPART_EXPR:
       rval_ops = false;
+      /* FALLTHRU */
     case CONJ_EXPR:
     case FIX_TRUNC_EXPR:
     case FLOAT_EXPR:
@@ -2168,6 +2170,7 @@ cp_fold (tree x)
     case COMPOUND_EXPR:
     case MODIFY_EXPR:
       rval_ops = false;
+      /* FALLTHRU */
     case POINTER_PLUS_EXPR:
     case PLUS_EXPR:
     case MINUS_EXPR:
diff --git a/gcc/cp/cvt.c b/gcc/cp/cvt.c
index 85b3047..977c665 100644
--- a/gcc/cp/cvt.c
+++ b/gcc/cp/cvt.c
@@ -1663,7 +1663,7 @@ build_expr_type_conversion (int desires, tree expr, bool complain)
       case INTEGER_TYPE:
 	if ((desires & WANT_NULL) && null_ptr_cst_p (expr))
 	  return expr;
-	/* else fall through...  */
+	/* fall through.  */
 
       case BOOLEAN_TYPE:
 	return (desires & WANT_INT) ? expr : NULL_TREE;
diff --git a/gcc/cp/cxx-pretty-print.c b/gcc/cp/cxx-pretty-print.c
index 192b26c..370476c 100644
--- a/gcc/cp/cxx-pretty-print.c
+++ b/gcc/cp/cxx-pretty-print.c
@@ -153,6 +153,7 @@ pp_cxx_unqualified_id (cxx_pretty_printer *pp, tree t)
     case USING_DECL:
     case TEMPLATE_DECL:
       t = DECL_NAME (t);
+      /* FALLTHRU */
 
     case IDENTIFIER_NODE:
       if (t == NULL)
@@ -280,6 +281,7 @@ pp_cxx_qualified_id (cxx_pretty_printer *pp, tree t)
 	 functions and some function templates.  */
     case OVERLOAD:
       t = OVL_CURRENT (t);
+      /* FALLTHRU */
     case FUNCTION_DECL:
       if (DECL_FUNCTION_MEMBER_P (t))
 	pp_cxx_nested_name_specifier (pp, DECL_CONTEXT (t));
@@ -331,7 +333,7 @@ cxx_pretty_printer::constant (tree t)
 	  pp_string (this, "nullptr");
 	  break;
 	}
-      /* else fall through.  */
+      /* fall through.  */
 
     default:
       c_pretty_printer::constant (t);
@@ -417,6 +419,7 @@ cxx_pretty_printer::primary_expression (tree t)
 
     case BASELINK:
       t = BASELINK_FUNCTIONS (t);
+      /* FALLTHRU */
     case VAR_DECL:
     case PARM_DECL:
     case FIELD_DECL:
@@ -872,7 +875,7 @@ pp_cxx_pm_expression (cxx_pretty_printer *pp, tree t)
 	  pp_cxx_qualified_id (pp, t);
 	  break;
 	}
-      /* Else fall through.  */
+      /* Fall through.  */
     case MEMBER_REF:
     case DOTSTAR_EXPR:
       pp_cxx_pm_expression (pp, TREE_OPERAND (t, 0));
@@ -1057,6 +1060,7 @@ cxx_pretty_printer::expression (tree t)
 
     case OVERLOAD:
       t = OVL_CURRENT (t);
+      /* FALLTHRU */
     case VAR_DECL:
     case PARM_DECL:
     case FIELD_DECL:
@@ -1267,7 +1271,9 @@ cxx_pretty_printer::declaration_specifiers (tree t)
       else if (DECL_NONSTATIC_MEMBER_FUNCTION_P (t))
 	declaration_specifiers (TREE_TYPE (TREE_TYPE (t)));
       else
-	default:
+        c_pretty_printer::declaration_specifiers (t);
+      break;
+    default:
         c_pretty_printer::declaration_specifiers (t);
       break;
     }
@@ -1364,7 +1370,7 @@ pp_cxx_type_specifier_seq (cxx_pretty_printer *pp, tree t)
 	  pp_cxx_ptr_operator (pp, t);
 	  break;
 	}
-      /* else fall through */
+      /* fall through */
 
     default:
       if (!(TREE_CODE (t) == FUNCTION_DECL && DECL_CONSTRUCTOR_P (t)))
@@ -1406,6 +1412,7 @@ pp_cxx_ptr_operator (cxx_pretty_printer *pp, tree t)
 	  pp_star (pp);
 	  break;
 	}
+      /* FALLTHRU */
     case OFFSET_TYPE:
       if (TYPE_PTRMEM_P (t))
 	{
@@ -1416,7 +1423,7 @@ pp_cxx_ptr_operator (cxx_pretty_printer *pp, tree t)
 	  pp_cxx_cv_qualifier_seq (pp, t);
 	  break;
 	}
-      /* else fall through.  */
+      /* fall through.  */
 
     default:
       pp_unsupported_tree (pp, t);
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index 0d46673..58cd48c 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -450,7 +450,7 @@ dump_type (cxx_pretty_printer *pp, tree t, int flags)
 		     ? DECL_ORIGINAL_TYPE (t) : TREE_TYPE (t), flags);
 	  break;
 	}
-      /* Else fall through.  */
+      /* Fall through.  */
 
     case TEMPLATE_DECL:
     case NAMESPACE_DECL:
@@ -1065,7 +1065,7 @@ dump_decl (cxx_pretty_printer *pp, tree t, int flags)
 	  dump_type (pp, DECL_CONTEXT (t), flags);
 	  break;
 	}
-      /* Else fall through.  */
+      /* Fall through.  */
     case FIELD_DECL:
     case PARM_DECL:
       dump_simple_decl (pp, t, TREE_TYPE (t), flags);
diff --git a/gcc/cp/mangle.c b/gcc/cp/mangle.c
index b42c6f9..d8b5c45 100644
--- a/gcc/cp/mangle.c
+++ b/gcc/cp/mangle.c
@@ -2169,7 +2169,7 @@ write_type (tree type)
 		  ++is_builtin_type;
 		  break;
 		}
-	      /* else fall through.  */
+	      /* fall through.  */
 	    case TEMPLATE_PARM_INDEX:
 	      write_template_param (type);
 	      break;
diff --git a/gcc/cp/method.c b/gcc/cp/method.c
index 63aa53e..75342ae 100644
--- a/gcc/cp/method.c
+++ b/gcc/cp/method.c
@@ -1420,6 +1420,7 @@ synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p,
     case sfk_move_constructor:
     case sfk_move_assignment:
       move_p = true;
+      /* FALLTHRU */
     case sfk_copy_constructor:
     case sfk_copy_assignment:
       copy_arg_p = true;
diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
index 11957fd..f6ba4d2 100644
--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -5659,6 +5659,7 @@ arg_assoc_type (struct arg_lookup *k, tree type)
     case RECORD_TYPE:
       if (TYPE_PTRMEMFUNC_P (type))
 	return arg_assoc_type (k, TYPE_PTRMEMFUNC_FN_TYPE (type));
+      /* FALLTHRU */
     case UNION_TYPE:
       return arg_assoc_class (k, type);
     case POINTER_TYPE:
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 1b9359e..48510d0 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -1268,7 +1268,7 @@ cp_lexer_print_token (FILE * stream, cp_token *token)
 	 For example, `struct' is mapped to an INTEGER_CST.  */
       if (!identifier_p (token->u.value))
 	break;
-      /* else fall through */
+      /* fall through */
     case CPP_NAME:
       fputs (IDENTIFIER_POINTER (token->u.value), stream);
       break;
@@ -5143,6 +5143,7 @@ cp_parser_primary_expression (cp_parser *parser,
 	      cp_parser_skip_to_end_of_block_or_statement (parser);
 	      return error_mark_node;
 	    }
+	  /* FALLTHRU */
 	default:
 	  cp_parser_error (parser, "expected primary-expression");
 	  return error_mark_node;
@@ -14096,6 +14097,7 @@ cp_parser_operator (cp_parser* parser)
     case CPP_UTF8STRING:
     case CPP_UTF8STRING_USERDEF:
       utf8 = true;
+      /* FALLTHRU */
     case CPP_STRING:
     case CPP_WSTRING:
     case CPP_STRING16:
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 1ee5fd4..5d4f5ef 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -3450,6 +3450,7 @@ find_parameter_packs_r (tree *tp, int *walk_subtrees, void* data)
 
     case TEMPLATE_TYPE_PARM:
       t = TYPE_MAIN_VARIANT (t);
+      /* FALLTHRU */
     case TEMPLATE_TEMPLATE_PARM:
       /* If the placeholder appears in the decl-specifier-seq of a function
 	 parameter pack (14.6.3), or the type-specifier-seq of a type-id that
@@ -11466,7 +11467,7 @@ tsubst_aggr_type (tree t,
       if (TYPE_PTRMEMFUNC_P (t))
 	return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl);
 
-      /* Else fall through.  */
+      /* Fall through.  */
     case ENUMERAL_TYPE:
     case UNION_TYPE:
       if (TYPE_TEMPLATE_INFO (t) && uses_template_parms (t))
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index a2e04f6..9ab8439 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -6225,11 +6225,13 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	      OMP_CLAUSE_OPERAND (c, 1) = t;
 	    }
 	  /* Check operand 0, the num argument.  */
+	  /* FALLTHRU */
 
 	case OMP_CLAUSE_WORKER:
 	case OMP_CLAUSE_VECTOR:
 	  if (OMP_CLAUSE_OPERAND (c, 0) == NULL_TREE)
 	    break;
+	  /* FALLTHRU */
 
 	case OMP_CLAUSE_NUM_TASKS:
 	case OMP_CLAUSE_NUM_TEAMS:
diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index 2e58615..6d254dd 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -141,11 +141,13 @@ lvalue_kind (const_tree ref)
 	 lvalues.  */
       if (! TREE_STATIC (ref))
 	return clk_none;
+      /* FALLTHRU */
     case VAR_DECL:
       if (TREE_READONLY (ref) && ! TREE_STATIC (ref)
 	  && DECL_LANG_SPECIFIC (ref)
 	  && DECL_IN_AGGR_P (ref))
 	return clk_none;
+      /* FALLTHRU */
     case INDIRECT_REF:
     case ARROW_EXPR:
     case ARRAY_REF: