tree.c (type_in_anonymous_namespace_p): Ignore TREE_PUBLIC on builtin types.
* 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.