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	(implicit_decl_warning): New function.
	(implicitly_declare): Use it.
	* c-typeck.c (build_external_ref): Use implicit_decl_warning
	to complain about implicit decls of builtins.

	* c-lang.c (lang_init): Set mesg_implicit_function_declaration
	based on pedantic && flag_isoc99, if not already set.
	* c-tree.h: Declare mesg_implicit_function_declaration.
	Prototype implicit_decl_warning.

	* gcc.dg/c99-impl-decl-1.c: No longer XFAIL.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35385 138bc75d-0d04-0410-961f-82ee72b054a4