* tree.c (type_in_anonymous_namespace_p): Ignore TREE_PUBLIC
	on builtin types.
	* ipa-devirt.c: Include stor-layout.h and intl.h
	(odr_subtypes_equivalent_p): New function.
	(warn_odr): New function.
	(warn_type_mismatch): New function.
	(odr_types_equivalent_p): New function.
	(add_type_duplicate): Use it.
	* common.opt (Wodr): New flag.
	* doc/invoke.texi (Wodr): Document new warning.

From-SVN: r212481