--- a/gcc/c-family/c-common.h	Sun Dec 23 21:23:56 2018 +0900
+++ b/gcc/c-family/c-common.h	Sun Mar 01 16:13:28 2020 +0900
@@ -1,5 +1,5 @@
 /* Definitions for c-common.c.
-   Copyright (C) 1987-2018 Free Software Foundation, Inc.
+   Copyright (C) 1987-2020 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -102,7 +102,8 @@
   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,	     RID_BUILTIN_SHUFFLE,
-  RID_BUILTIN_TGMATH,
+  RID_BUILTIN_CONVERTVECTOR,   RID_BUILTIN_TGMATH,
+  RID_BUILTIN_HAS_ATTRIBUTE,
   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 
   /* TS 18661-3 keywords, in the same sequence as the TI_* values.  */
@@ -179,9 +180,18 @@
   /* C++11 */
   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 
+  /* C++20 */
+  RID_CONSTINIT, RID_CONSTEVAL,
+
+  /* char8_t */
+  RID_CHAR8,
+
   /* C++ concepts */
   RID_CONCEPT, RID_REQUIRES,
 
+  /* C++ coroutines */
+  RID_CO_AWAIT, RID_CO_YIELD, RID_CO_RETURN,
+
   /* C++ transactional memory.  */
   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 
@@ -250,6 +260,8 @@
 
   RID_FIRST_CXX11 = RID_CONSTEXPR,
   RID_LAST_CXX11 = RID_STATIC_ASSERT,
+  RID_FIRST_CXX20 = RID_CONSTINIT,
+  RID_LAST_CXX20 = RID_CONSTINIT,
   RID_FIRST_AT = RID_AT_ENCODE,
   RID_LAST_AT = RID_AT_IMPLEMENTATION,
   RID_FIRST_PQ = RID_IN,
@@ -290,6 +302,7 @@
 
 enum c_tree_index
 {
+    CTI_CHAR8_TYPE,
     CTI_CHAR16_TYPE,
     CTI_CHAR32_TYPE,
     CTI_WCHAR_TYPE,
@@ -333,6 +346,7 @@
     CTI_UINTPTR_TYPE,
 
     CTI_CHAR_ARRAY_TYPE,
+    CTI_CHAR8_ARRAY_TYPE,
     CTI_CHAR16_ARRAY_TYPE,
     CTI_CHAR32_ARRAY_TYPE,
     CTI_WCHAR_ARRAY_TYPE,
@@ -412,20 +426,25 @@
    mask) is _true_.  Thus for keywords which are present in all
    languages the disable field is zero.  */
 
-#define D_CONLY		0x001	/* C only (not in C++).  */
-#define D_CXXONLY	0x002	/* C++ only (not in C).  */
-#define D_C99		0x004	/* In C, C99 only.  */
-#define D_CXX11         0x008	/* In C++, C++11 only.  */
-#define D_EXT		0x010	/* GCC extension.  */
-#define D_EXT89		0x020	/* GCC extension incorporated in C99.  */
-#define D_ASM		0x040	/* Disabled by -fno-asm.  */
-#define D_OBJC		0x080	/* In Objective C and neither C nor C++.  */
-#define D_CXX_OBJC	0x100	/* In Objective C, and C++, but not C.  */
-#define D_CXXWARN	0x200	/* In C warn with -Wcxx-compat.  */
-#define D_CXX_CONCEPTS  0x400   /* In C++, only with concepts. */
-#define D_TRANSMEM	0X800   /* C++ transactional memory TS.  */
+#define D_CONLY		0x0001	/* C only (not in C++).  */
+#define D_CXXONLY	0x0002	/* C++ only (not in C).  */
+#define D_C99		0x0004	/* In C, C99 only.  */
+#define D_CXX11         0x0008	/* In C++, C++11 only.  */
+#define D_EXT		0x0010	/* GCC extension.  */
+#define D_EXT89		0x0020	/* GCC extension incorporated in C99.  */
+#define D_ASM		0x0040	/* Disabled by -fno-asm.  */
+#define D_OBJC		0x0080	/* In Objective C and neither C nor C++.  */
+#define D_CXX_OBJC	0x0100	/* In Objective C, and C++, but not C.  */
+#define D_CXXWARN	0x0200	/* In C warn with -Wcxx-compat.  */
+#define D_CXX_CONCEPTS  0x0400	/* In C++, only with concepts.  */
+#define D_TRANSMEM	0X0800	/* C++ transactional memory TS.  */
+#define D_CXX_CHAR8_T	0X1000	/* In C++, only with -fchar8_t.  */
+#define D_CXX20		0x2000  /* In C++, C++20 only.  */
+#define D_CXX_COROUTINES 0x4000  /* In C++, only with coroutines.  */
 
 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
+#define D_CXX_CHAR8_T_FLAGS D_CXXONLY | D_CXX_CHAR8_T
+#define D_CXX_COROUTINES_FLAGS (D_CXXONLY | D_CXX_COROUTINES)
 
 /* The reserved keyword table.  */
 extern const struct c_common_resword c_common_reswords[];
@@ -433,6 +452,7 @@
 /* The number of items in the reserved keyword table.  */
 extern const unsigned int num_c_common_reswords;
 
+#define char8_type_node			c_global_trees[CTI_CHAR8_TYPE]
 #define char16_type_node		c_global_trees[CTI_CHAR16_TYPE]
 #define char32_type_node		c_global_trees[CTI_CHAR32_TYPE]
 #define wchar_type_node			c_global_trees[CTI_WCHAR_TYPE]
@@ -478,6 +498,7 @@
 #define truthvalue_false_node		c_global_trees[CTI_TRUTHVALUE_FALSE]
 
 #define char_array_type_node		c_global_trees[CTI_CHAR_ARRAY_TYPE]
+#define char8_array_type_node		c_global_trees[CTI_CHAR8_ARRAY_TYPE]
 #define char16_array_type_node		c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 #define char32_array_type_node		c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 #define wchar_array_type_node		c_global_trees[CTI_WCHAR_ARRAY_TYPE]
@@ -689,11 +710,6 @@
    != (warn_abi_version == 0			\
        || warn_abi_version >= (N)))
 
-/* Nonzero means generate separate instantiation control files and
-   juggle them at link time.  */
-
-extern int flag_use_repository;
-
 /* The supported C++ dialects.  */
 
 enum cxx_dialect {
@@ -750,6 +766,16 @@
 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
   (!C_TYPE_FUNCTION_P (type))
 
+/* Return true if TYPE is a vector type that should be subject to the GNU
+   vector extensions (as opposed to a vector type that is used only for
+   the purposes of defining target-specific built-in functions).  */
+
+inline bool
+gnu_vector_type_p (const_tree type)
+{
+  return TREE_CODE (type) == VECTOR_TYPE && !TYPE_INDIVISIBLE_P (type);
+}
+
 struct visibility_flags
 {
   unsigned inpragma : 1;	/* True when in #pragma GCC visibility.  */
@@ -762,8 +788,7 @@
   SAFE_CONVERSION = 0,
   /* Another type of conversion with problems.  */
   UNSAFE_OTHER,
-  /* Conversion between signed and unsigned integers
-     which are all warned about immediately, so this is unused.  */
+  /* Conversion between signed and unsigned integers.  */
   UNSAFE_SIGN,
   /* Conversions that reduce the precision of reals including conversions
      from reals to integers.  */
@@ -794,6 +819,8 @@
 extern bool in_late_binary_op;
 extern const char *c_addr_space_name (addr_space_t as);
 extern tree identifier_global_value (tree);
+extern tree identifier_global_tag (tree);
+extern bool names_builtin_p (const char *);
 extern tree c_linkage_bindings (tree);
 extern void record_builtin_type (enum rid, const char *, tree);
 extern tree build_void_list_node (void);
@@ -802,7 +829,7 @@
 extern const char *fname_as_string (int);
 extern tree fname_decl (location_t, unsigned, tree);
 
-extern int check_user_alignment (const_tree, bool);
+extern int check_user_alignment (const_tree, bool, bool);
 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 				      int, tree *, vec<location_t> *);
 extern void check_function_arguments_recurse (void (*)
@@ -811,8 +838,9 @@
 					      void *, tree,
 					      unsigned HOST_WIDE_INT);
 extern bool check_builtin_function_arguments (location_t, vec<location_t>,
-					      tree, int, tree *);
-extern void check_function_format (tree, int, tree *, vec<location_t> *);
+					      tree, tree, int, tree *);
+extern void check_function_format (const_tree, tree, int, tree *,
+				   vec<location_t> *);
 extern bool attribute_fallthrough_p (tree);
 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
@@ -829,8 +857,7 @@
 extern tree c_common_signed_or_unsigned_type (int, tree);
 extern void c_common_init_ts (void);
 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
-extern enum conversion_safety unsafe_conversion_p (location_t, tree, tree, tree,
-						   bool);
+extern enum conversion_safety unsafe_conversion_p (tree, tree, tree, bool);
 extern bool decl_with_nonnull_addr_p (const_tree);
 extern tree c_fully_fold (tree, bool, bool *, bool = false);
 extern tree c_wrap_maybe_const (tree, bool);
@@ -861,7 +888,7 @@
 extern bool bool_promoted_to_int_p (tree);
 extern tree fold_for_warn (tree);
 extern tree c_common_get_narrower (tree, int *);
-extern bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *);
+extern bool get_attribute_operand (tree, unsigned HOST_WIDE_INT *);
 
 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
@@ -981,14 +1008,14 @@
 
 extern int case_compare (splay_tree_key, splay_tree_key);
 
-extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree,
-			      bool *);
+extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree);
 extern bool c_switch_covers_all_cases_p (splay_tree, tree);
 
 extern tree build_function_call (location_t, tree, tree);
 
 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
-				     vec<tree, va_gc> *, vec<tree, va_gc> *);
+				     vec<tree, va_gc> *, vec<tree, va_gc> *,
+				     tree = NULL_TREE);
 
 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
 
@@ -1003,6 +1030,7 @@
 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
+extern tree c_build_vec_convert (location_t, tree, location_t, tree, bool = true);
 
 extern void init_c_lex (void);
 
@@ -1013,6 +1041,7 @@
 			      const char *, va_list *)
      ATTRIBUTE_GCC_DIAG(5,0);
 extern int c_common_has_attribute (cpp_reader *);
+extern int c_common_has_builtin (cpp_reader *);
 
 extern bool parse_optimize_options (tree, bool);
 
@@ -1054,6 +1083,7 @@
 extern void c_common_mark_addressable_vec (tree);
 
 extern void set_underlying_type (tree);
+extern bool user_facing_original_type_p (const_tree);
 extern void record_types_used_by_current_var_decl (tree);
 extern vec<tree, va_gc> *make_tree_vector (void);
 extern void release_tree_vector (vec<tree, va_gc> *);
@@ -1141,7 +1171,8 @@
   C_OMP_CLAUSE_SPLIT_SIMD,
   C_OMP_CLAUSE_SPLIT_COUNT,
   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
-  C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR
+  C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR,
+  C_OMP_CLAUSE_SPLIT_LOOP = C_OMP_CLAUSE_SPLIT_FOR
 };
 
 enum c_omp_region_type
@@ -1153,18 +1184,21 @@
 };
 
 extern tree c_finish_omp_master (location_t, tree);
-extern tree c_finish_omp_taskgroup (location_t, tree);
+extern tree c_finish_omp_taskgroup (location_t, tree, tree);
 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
 extern tree c_finish_omp_ordered (location_t, tree, tree);
 extern void c_finish_omp_barrier (location_t);
 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
-				 tree, tree, tree, tree, tree, bool, bool,
-				 bool = false);
-extern void c_finish_omp_flush (location_t);
+				 tree, tree, tree, tree, tree, bool,
+				 enum omp_memory_order, bool = false);
+extern bool c_omp_depend_t_p (tree);
+extern void c_finish_omp_depobj (location_t, tree, enum omp_clause_depend_kind,
+				 tree);
+extern void c_finish_omp_flush (location_t, int);
 extern void c_finish_omp_taskwait (location_t);
 extern void c_finish_omp_taskyield (location_t);
 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
-			      tree, tree, tree, tree);
+			      tree, tree, tree, tree, bool);
 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
 extern bool c_omp_check_loop_iv_exprs (location_t, tree, tree, tree, tree,
 				       walk_tree_lh);
@@ -1174,7 +1208,11 @@
 				 tree, tree *);
 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
+extern bool c_omp_predefined_variable (tree);
 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
+extern tree c_omp_check_context_selector (location_t, tree);
+extern void c_omp_mark_declare_variant (location_t, tree, tree);
+extern const char *c_omp_map_clause_name (tree, bool);
 
 /* Return next tree in the chain for chain_next walking of tree nodes.  */
 static inline tree
@@ -1259,7 +1297,9 @@
 extern tree replace_inv_trees (tree *, int *, void *);
 
 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
-extern bool valid_array_size_p (location_t, tree, tree, bool = true);
+extern bool valid_array_size_p (location_t, const_tree, tree, bool = true);
+extern void invalid_array_size_error (location_t, cst_size_error,
+				      const_tree, const_tree);
 
 /* In c-warn.c.  */
 extern void constant_expression_warning (tree);
@@ -1267,7 +1307,8 @@
 extern void overflow_warning (location_t, tree, tree = NULL_TREE);
 extern void warn_logical_operator (location_t, enum tree_code, tree,
 				   enum tree_code, tree, enum tree_code, tree);
-extern void warn_tautological_cmp (location_t, enum tree_code, tree, tree);
+extern void warn_tautological_cmp (const op_location_t &, enum tree_code,
+				   tree, tree);
 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
 					  tree);
 extern bool warn_if_unused_value (const_tree, location_t);
@@ -1277,10 +1318,10 @@
 					      bool (*) (tree, tree));
 extern void check_main_parameter_types (tree decl);
 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
-extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool,
-				  bool);
+extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool);
 extern void warn_for_omitted_condop (location_t, tree);
 extern bool warn_for_restrict (unsigned, tree *, unsigned);
+extern void warn_for_address_or_pointer_of_packed_member (tree, tree);
 
 /* Places where an lvalue, or modifiable lvalue, may be required.
    Used to select diagnostic messages in lvalue_error and
@@ -1325,11 +1366,31 @@
 
 /* In c-attribs.c.  */
 extern bool attribute_takes_identifier_p (const_tree);
+extern tree handle_deprecated_attribute (tree *, tree, tree, int, bool *);
 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
+extern tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *);
 extern int parse_tm_stmt_attr (tree, int);
 extern int tm_attr_to_mask (tree);
 extern tree tm_mask_to_attr (int);
 extern tree find_tm_attribute (tree);
+extern const struct attribute_spec::exclusions attr_cold_hot_exclusions[];
+extern const struct attribute_spec::exclusions attr_noreturn_exclusions[];
+extern tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
+
+/* In c-format.c.  */
+extern bool valid_format_string_type_p (tree);
+
+/* A bitmap of flags to positional_argument.  */
+enum posargflags {
+  /* Consider positional attribute argument value zero valid.  */
+  POSARG_ZERO = 1,
+  /* Consider positional attribute argument value valid if it refers
+     to the ellipsis (i.e., beyond the last typed argument).  */
+  POSARG_ELLIPSIS = 2
+};
+
+extern tree positional_argument (const_tree, const_tree, tree, tree_code,
+				 int = 0, int = posargflags ());
 
 extern enum flt_eval_method
 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
@@ -1341,7 +1402,9 @@
 extern void maybe_suggest_missing_token_insertion (rich_location *richloc,
 						   enum cpp_ttype token_type,
 						   location_t prev_token_loc);
-extern tree braced_list_to_string (tree, tree);
+extern tree braced_lists_to_strings (tree, tree);
+
+extern bool has_attribute (location_t, tree, tree, tree (*)(tree));
 
 #if CHECKING_P
 namespace selftest {