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References: <20110625161357.GA5401@intel.com>	<4E078E58.20903@redhat.com>
Date: Sun, 26 Jun 2011 21:45:00 -0000
Message-ID: <BANLkTikToedVDqx9V+bB9xb+dL_r-6f31g@mail.gmail.com>
Subject: Re: PATCH [8/n]: Prepare x32: PR other/48007: Unwind library doesn't work with UNITS_PER_WORD > sizeof (void *)
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Jason Merrill <jason@redhat.com>
Cc: gcc-patches@gcc.gnu.org, Richard Henderson <rth@redhat.com>
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On Sun, Jun 26, 2011 at 12:54 PM, Jason Merrill <jason@redhat.com> wrote:
> On 06/25/2011 12:13 PM, H.J. Lu wrote:
>>
>> This patch introduces UNIQUE_UNWIND_CONTEXT
>
> Where is this documented? =A0The 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.


--=20
H.J.