On Aug 1, 2018, at 4:35 PM, Charles Forsyth <charles.forsyth@gmail.com> wrote:

> even so, the format and intention of the example seems practical (with the correct cast to uintptr) and "An implementation may accept other forms of constant expressions".
> it should be fairly easy to add as an extension with consistent handling across ?c.

Both gcc and clang handle this case. This example was derived from
ObjectIcon (it works on plan9/x86 & unix systems but not on plan9/arm).

I am not familiar with the C compiler sources but will take a look.

Thanks for your response.