[serialization] Backward compatibility problem with 1:73

From: Kai Benndorf (kai.benndorf_at_[hidden])
Date: 2020-06-24 13:09:32

Hi all,

we are using boost serialization for writing and reading data and just
switched from boost 1:67 to boost 1:73.
We now cannot read back the data written with boost 1:67 or prior. We get an
archive_exception::input_stream_error exception.

Examining the files shows the difference. The old files are starting with

22 serialization::archive 16

The new files are missing this data. Removing it from the files enabled the
reading with boost 1:73.

But strangely, if trying a small example program (the gps example from the
documentation) also boost 1:73 produces this data:
22 serialization::archive 18

Any idea what has changed in between these versions and could cause this
problem? Thanks in advance for any hint.

Our application uses an own derived archive class. Maybe I have to changed
something there?

Best regards

Kai Benndorf

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