[Bug c/69404] atomic builtins accept incompatible pointers

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69404

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So this might be following C++ rules here dealing with qualifiers.

There is no discarding of qualifiers either but rather adding them according to
C++ rules.

Note C and C++ deals with inner qualifiers differently.

The reason why I said it does not discard here is because take:
    __atomic_load (&p, &q, 0);


This is basically p = q;  so you need to add const qualifier to the inner most
type.  And __atomic_load supports pointers to pointers that have qualifiers on
the inner type.