Fix breakage of ARM EABI EH unwinding code.

[Richard Earnshaw]

On Wed, 2007-05-23 at 17:07 -0400, Daniel Jacobowitz wrote:
> On Wed, May 23, 2007 at 09:58:35PM +0100, Richard Earnshaw wrote:
> > The C++ libraries for arm-eabi port have been unbuildable since Jason
> > checked in his foreign exceptions unwinding patch on May 7th.  This
> > patch fixes the problems by adding the appropriate functionality to the
> > __cxa_type_match routine (the ARM unwinder model currently doesn't
> > support forced unwinding -- an ongoing issue for the ABI).
> 
> But the implementation of that ABI (with some flexibility) in GCC does
> support forced unwinding - I guess that does not provide whatever it
> is that we would need here?
> 
> (As you can tell, despite the amount of work I've done on unwinding,
> I'm exception-ignorant.)
> 

... and so am I.  But none of the exception savvy people seem to be
prepared to stand up and address this :-(  And without it I can't even
build the C++ libraries...

R.