H' hex constants

[Nick Clifton]

Hi DJ,

> How about this?  It requires the target to enable the code at compile
> time, and the user to enable it at runtime.  A sample target change
> for m32c is included.  It's a simple patch (good) that's harmless
> unless invoked (also good) and works as expected in the normal use
> case (good). 

Approved, providing that it does not introduce any regressions (both for 
the m32c and an x86 native).

> It doesn't gracefully handle syntax errors though (bad),
> but I suspect it's no worse than the surprise the user gets when they
> use H'00 without this patch.  Perhaps an additional warning for single
> quotes following symbol chars would be useful?

Yes that might be helpful.

Cheers
   Nick