attribs.c (decl_attributes): Possibly call insert_default_attributes to insert default attributes on...

	* attribs.c (decl_attributes): Possibly call
	insert_default_attributes to insert default attributes on
	functions in a lazy manner.
	* builtin-attrs.def: New file; define the default format and
	format_arg attributes.
	* c-common.c (c_format_attribute_table): Move to earlier in the
	file.
	(c_common_nodes_and_builtins): Initialize format_attribute_table.
	(enum built_in_attribute, built_in_attributes,
	c_attrs_initialized, c_init_attributes,
	c_common_insert_default_attributes): New.
	(c_common_lang_init): Don't initialize format_attribute_table.  Do
	call c_init_attributes.
	* Makefile.in (c-common.o): Depend on builtin-attrs.def.
	* c-common.h (init_function_format_info): Don't declare.
	(c_common_insert_default_attributes): Declare.
	* c-decl.c (implicitly_declare, builtin_function): Call
	decl_attributes.
	(init_decl_processing): Don't call init_function_format_info.
	(insert_default_attributes): New.
	* c-format.c (handle_format_attribute,
	handle_format_arg_attribute): Be quiet about inappropriate
	declaration when applying default attributes.
	(init_function_format_info): Remove.
	* tree.h (enum attribute_flags): Add ATTR_FLAG_BUILT_IN.
	(insert_default_attributes): Declare.

cp:
	* decl.c (init_decl_processing): Don't call
	init_function_format_info.  Initialize lang_attribute_table
	earlier.
	(builtin_function): Call decl_attributes.
	(insert_default_attributes): New.

testsuite:
	* gcc.dg/format/attr-5.c, gcc.dg/format/attr-6.c: New tests.

From-SVN: r45942

1 files changed, 19 insertions, 4 deletions

diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 4652267..f3ad82e 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -2505,7 +2505,7 @@ tree
 implicitly_declare (functionid)
      tree functionid;
 {
-  register tree decl;
+  tree decl;
   int traditional_warning = 0;
   /* Only one "implicit declaration" warning per identifier.  */
   int implicit_warning;
@@ -2555,6 +2555,9 @@ implicitly_declare (functionid)
 
   gen_aux_info_record (decl, 0, 1, 0);
 
+  /* Possibly apply some default attributes to this implicit declaration.  */
+  decl_attributes (&decl, NULL_TREE, 0);
+
   return decl;
 }
 
@@ -3056,9 +3059,6 @@ init_decl_processing ()
   make_fname_decl = c_make_fname_decl;
   start_fname_decls ();
 
-  /* Prepare to check format strings against argument lists.  */
-  init_function_format_info ();
-
   incomplete_decl_finalize_hook = finish_incomplete_decl;
 
   /* Record our roots.  */
@@ -3152,8 +3152,23 @@ builtin_function (name, type, function_code, class, library_name)
   if (name[0] != '_' || name[1] != '_')
     C_DECL_ANTICIPATED (decl) = 1;
 
+  /* Possibly apply some default attributes to this built-in function.  */
+  decl_attributes (&decl, NULL_TREE, 0);
+
   return decl;
 }
+
+/* Apply default attributes to a function, if a system function with default
+   attributes.  */
+
+void
+insert_default_attributes (decl)
+     tree decl;
+{
+  if (!TREE_PUBLIC (decl))
+    return;
+  c_common_insert_default_attributes (decl);
+}
 
 /* Called when a declaration is seen that contains no names to declare.
    If its type is a reference to a structure, union or enum inherited