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

[tromey at gcc dot gnu.org]

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

--- Comment #10 from Tom Tromey <tromey at gcc dot gnu.org> ---
Relatedly, could you say what the option "-Wcast-to-as" provides
beyond the normal warnings about changing address spaces?
I wonder if this is something I should be pulling in as well.
"man sparse" doesn't really say much here.