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

	PR c/7652
gcc/cp/
	* call.c (add_builtin_candidate): Add gcc_fallthrough.
	* cxx-pretty-print.c (pp_cxx_unqualified_id): Likewise.
	* parser.c (cp_parser_skip_to_end_of_statement): Likewise.
	(cp_parser_cache_defarg): Likewise.
libcpp/
	* pch.c (write_macdef): Add CPP_FALLTHRU.

From-SVN: r239566

gcc/cp/ChangeLog

+2016-08-18  Marek Polacek  <polacek@redhat.com>
+
+	PR c/7652
+	* call.c (add_builtin_candidate): Add gcc_fallthrough.
+	* cxx-pretty-print.c (pp_cxx_unqualified_id): Likewise.
+	* parser.c (cp_parser_skip_to_end_of_statement): Likewise.
+	(cp_parser_cache_defarg): Likewise.
+
 2016-08-12  Marek Polacek  <polacek@redhat.com>
 
 	PR c/7652

gcc/cp/call.c

@@ -2544,6 +2544,8 @@ add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
 	  type2 = ptrdiff_type_node;
 	  break;
 	}
+      /* XXX Really fallthru?  */
+      /* FALLTHRU */
     case MULT_EXPR:
     case TRUNC_DIV_EXPR:
       if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))

gcc/cp/cxx-pretty-print.c

@@ -142,6 +142,8 @@ pp_cxx_unqualified_id (cxx_pretty_printer *pp, tree t)
 
     case OVERLOAD:
       t = OVL_CURRENT (t);
+      /* XXX Really fallthru?  */
+      /* FALLTHRU */
     case VAR_DECL:
     case PARM_DECL:
     case CONST_DECL:

gcc/cp/parser.c

@@ -3490,6 +3490,8 @@ cp_parser_skip_to_end_of_statement (cp_parser* parser)
 	      cp_lexer_consume_token (parser->lexer);
 	      return;
 	    }
+	  /* XXX Really fallthru?  */
+	  /* FALLTHRU */
 
 	case CPP_OPEN_BRACE:
 	  ++nesting_depth;
@@ -27669,6 +27671,8 @@ cp_parser_cache_defarg (cp_parser *parser, bool nsdmi)
 	      parser->in_template_argument_list_p = saved_italp;
 	      break;
 	    }
+	  /* XXX Really fallthru?  */
+	  /* FALLTHRU */
 	case CPP_CLOSE_PAREN:
 	case CPP_ELLIPSIS:
 	  /* If we run into a non-nested `;', `}', or `]',

libcpp/ChangeLog

+2016-08-18  Marek Polacek  <polacek@redhat.com>
+
+	PR c/7652
+	* pch.c (write_macdef): Add CPP_FALLTHRU.
+
 2016-08-12  Marek Polacek  <polacek@redhat.com>
 
 	PR c/7652

libcpp/pch.c

@@ -55,6 +55,8 @@ write_macdef (cpp_reader *pfile, cpp_hashnode *hn, void *file_p)
     case NT_VOID:
       if (! (hn->flags & NODE_POISONED))
 	return 1;
+      /* XXX Really fallthru?  */
+      /* FALLTHRU */
 
     case NT_MACRO:
       if ((hn->flags & NODE_BUILTIN)