* tree.c (cp_valid_lang_attribute): Don't set CLASSTYPE_COM_INTERFACE
        for v3 ABI.

        * typeck.c (cp_truthvalue_conversion): New fn.
        * cvt.c (ocp_convert): Use it.

        * cp-tree.h: Lose c-common.c decls.

        * typeck.c (build_unary_op): Restore old &a.f diagnostic code.
        * cvt.c (convert_to_void): Use type_unknown_p.

From-SVN: r38636