[Bug target/79671] [7 Regression] mapnik miscompilation on armv7hl since r235622

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671

--- Comment #65 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Michael Matz from comment #64)
> I would find it extremely surprising if in
> 
>   a = b;
> 
> the RHS doesn't constitute an access to the value of object 'b' (even
> depending on the type of b).  Are you really saying this Jason? (just trying
> to make extra
> sure)

It accesses b, but it doesn't access the object stored in b's char[N] member
via placement new.