On Sun, Jun 26, 2011 at 12:54 PM, Jason Merrill <ja...@redhat.com> wrote:
> On 06/25/2011 12:13 PM, H.J. Lu wrote:
>>
>> This patch introduces UNIQUE_UNWIND_CONTEXT
>
> Where is this documented?  The ABI document doesn't seem to say anything
> about it.
>

I added a short paragraph in the updated patch:

http://gcc.gnu.org/ml/gcc-patches/2011-06/msg01922.html

+@defmac UNIQUE_UNWIND_CONTEXT
+
+Define this macro if the target only supports single unqiue unwind
+context.  The default is to support multiple unwind contexts.
+
+@end defmac

This is the implementation detail and isn't required by the ABI.
With the unique unwind context, we can update the unwind
context format without breaking binary compatibility.

Thanks.


-- 
H.J.

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