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Subject: Re: [boost] [1.44] Beta progress?
From: Matthias Troyer (troyer_at_[hidden])
Date: 2010-07-21 19:19:10

On 21 Jul 2010, at 14:28, Eric Niebler wrote:

> On 7/21/2010 5:00 PM, Robert Ramey wrote:
>> Ryan Gallagher wrote:
>>> Based upon your messages, it's not clear to me what this "fix" does.
>>> Does it make it so that serialization in 1.44 will be able to read
>>> binary archives from 1.41 or does it make it so that serialization in
>>> 1.44 will be able to read binary archives from 1.42/43? Or somehow
>>> both? Is there a trac issue?
>> I'll recapilate the history in a little more detail.
>> a) 1.41 - every thing fine
>> b) 1.42 - 17 November 2009? make some fixes to addressess warning messages.
>> This actually exposed some dependence on undefined behaviorj
>> so it was judged a good thing
>> c) These changes broke MPI but this was not noticed at the time.
>> Doug Gregor checked in some changes to the serialization
>> library to address the MPI issue. But this broke compatibility
>> with previous binary_archives.
>> d) 1.43 released
>> I spent a fair amount of time reconciling all the above.
>> This does require a change in archives which derive
>> from binary_?archive. I am sorry about that, but I
>> could find no other way to reconcile all the requirments.
>> as far as I could see, the changes should be small
>> and perhaps trivial since MPI doesn't have support
>> previous versions.
> That sentence doesn't parse. I think you're missing a "to" in there. MPI
> doesn't have "to" support previous versions, presumably because the
> serialized forms are only traveling across a wire and are never
> persisted to disk. Is that right? Matthias, is that assumption correct.


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