[Bug c/59850] Support sparse-style pointer address spaces (type attributes)

[hpa at zytor dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59850

--- Comment #8 from H. Peter Anvin <hpa at zytor dot com> ---
Arguably the *right* way to solve that would be to support __null for C as well
as for C++.