Re: libECPG: Warning: get descriptor: 7.1 and 7.2 arenot

From: Christof Petig <christof(at)petig-baender(dot)de>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: pgsql-interfaces(at)postgresql(dot)org, Michael Meskes <meskes(at)postgresql(dot)org>
Subject: Re: libECPG: Warning: get descriptor: 7.1 and 7.2 arenot
Date: 2001-10-08 06:39:47
Message-ID: 3BC14A33.B251D9AE@petig-baender.de
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Peter Eisentraut wrote:

> Christof Petig writes:
>
> > I just noticed that libecpg.so.3.2.0 and libecpg.so.3.3.0 are not binary
> > compatible.
> > A program using get descriptor stopped working (still under
> > investigation) once I installed the new libecpg.
>
> I seem to remember that some enums were rearranged or renumbered. Look
> there.

You guessed right. I think I found the problem ...

@@ -67,10 +68,11 @@
ECPGd_ret_octet,
ECPGd_scale,
ECPGd_type,
+ ECPGd_cardinality,
ECPGd_EODT /* End of descriptor
typ
es. */
};

IIRC the list of descriptor types is terminated by ECPGd_EODT. So the new
library can't figure out where the old code's argument stop.

Fix: put ECPGd_cardinality behind ECPGd_EODT.
I reordered them because of logical considerations, maybe we should weight
binary compatibility more than beautiful-sortedness of enum values.

Michael: Would you swap the lines?

Thanks
Christof

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