[PATCH] Adjust lazy macro definition

https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01072.html
	libcpp/
	* include/cpplib.h (struct cpp_callbacks): Replace
	user_builtin_macro with user_lazy_macro.
	(struct cpp_macro): add lazy field.
	(enum cpp_builtin_type): Remove BT_FIRST_USER, BT_LAST_USER.
	(cpp_define_lazily): Declare.
	* macro.c (enter_macro_context) Use _cpp_maybe_notify_macro_use.
	(warn_of_redefinition): Use cpp_builtin_macro_p, directly call
	user_lazy_macro hook.
	(_cpp_new_macro): Clear lazy field.
	(cpp_define_lazily): Define.
	(_cpp_notify_macro_use): Adjust lazy definition code.
	(cpp_macro_definition): No need to do lazy definition here.
	* pch.c (write_macdef, save_macros): Likewise.
	gcc/c-family/
	* c-cppbuiltin.c (struct lazy_hex_fp_value_struct): Remove macro
	field.
	(laxy_hex_fp_value_count): Make unsigned.
	(lazy_hex_fp_value): Provided with macro & lazy number.  Directly
	manipulate the macro.
	(builtin_defin_with_hex_fp_value): Adjust callback name, use
	cpp_define_lazily.

From-SVN: r263640

libcpp/include/cpplib.h

@@ -605,8 +605,8 @@ struct cpp_callbacks
   /* Callback to identify whether an attribute exists.  */
   int (*has_attribute) (cpp_reader *);
 
-  /* Callback that can change a user builtin into normal macro.  */
-  bool (*user_builtin_macro) (cpp_reader *, cpp_hashnode *);
+  /* Callback that can change a user lazy into normal macro.  */
+  void (*user_lazy_macro) (cpp_reader *, cpp_macro *, unsigned);
 
   /* Callback to parse SOURCE_DATE_EPOCH from environment.  */
   time_t (*get_source_date_epoch) (cpp_reader *);
@@ -698,6 +698,9 @@ struct GTY(()) cpp_macro {
   /* Number of parameters.  */
   unsigned short paramc;
 
+  /* Non-zero if this is a user-lazy macro, value provided by user.  */
+  unsigned char lazy;
+
   /* The kind of this macro (ISO, trad or assert) */
   unsigned kind : 2;
 
@@ -778,9 +781,7 @@ enum cpp_builtin_type
   BT_PRAGMA,			/* `_Pragma' operator */
   BT_TIMESTAMP,			/* `__TIMESTAMP__' */
   BT_COUNTER,			/* `__COUNTER__' */
-  BT_HAS_ATTRIBUTE,		/* `__has_attribute__(x)' */
-  BT_FIRST_USER,		/* User defined builtin macros.  */
-  BT_LAST_USER = BT_FIRST_USER + 63
+  BT_HAS_ATTRIBUTE		/* `__has_attribute__(x)' */
 };
 
 #define CPP_HASHNODE(HNODE)	((cpp_hashnode *) (HNODE))
@@ -1001,6 +1002,9 @@ extern void cpp_assert (cpp_reader *, const char *);
 extern void cpp_undef (cpp_reader *, const char *);
 extern void cpp_unassert (cpp_reader *, const char *);
 
+/* Mark a node as a lazily defined macro.  */
+extern void cpp_define_lazily (cpp_reader *, cpp_hashnode *node, unsigned N);
+
 /* Undefine all macros and assertions.  */
 extern void cpp_undef_all (cpp_reader *);