[PATCH] diagnose unsupported uses of hardware register variables (PR 88000)

[Jakub Jelinek]

On Wed, Nov 14, 2018 at 06:11:37AM -0600, Segher Boessenkool wrote:
> It doesn't "break" anything because it currently isn't guaranteed to work
> either.  There is __builtin_frame_address(0) for this of course (well,
> almost the same semantics, and it is actually well-defined and actually
> works).  Is there user code that tries to do this with a register var?

I've seen such code many times over the years, don't have time to perform
code searches for such kind of constructs now though.

	Jakub