[Bug c++/86763] [7/8 Regression] Wrong code comparing member of copy of a 237 byte object with nontrivial default constructor on x86-64 arch

[curlypaul924 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86763

--- Comment #12 from Paul Brannan <curlypaul924 at gmail dot com> ---
(In reply to Richard Biener from comment #9)
> The following seems to work, will test.
> 
> Index: gcc/cp/class.c
> ===================================================================
> --- gcc/cp/class.c      (revision 263209)
> +++ gcc/cp/class.c      (working copy)
> @@ -6243,6 +6243,7 @@ layout_class_type (tree t, tree *virtual
>                                   bitsize_int (BITS_PER_UNIT)));
>        SET_TYPE_ALIGN (base_t, rli->record_align);
>        TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t);
> +      TYPE_TYPELESS_STORAGE (base_t) = TYPE_TYPELESS_STORAGE (t);
>  
>        /* Copy the non-static data members of T. This will include its
>          direct non-virtual bases & vtable.  */

This patch fixes the failure in my original (non-reduced test case).