Hi,
> - Build an embedded SQL C application with PostgreSQL 9.2.
> - Distribute the app without ecpg nor libpq libraries. Require users
> to install PostgreSQL client which includes ecpg and libpq libraries.
> - Use the app with newer PostgreSQL major versions without rebuilding
> the app. That is, the users just replaces the PostgreSQL client.
>
> I expect this is legal, because the so_major versions of ecpg and
> libpq are 6 and 5 respectively for all PostgreSQL 9.x versions so
> far. However, I could not find any description of this binary
> compatibility policy in the manual, so I haven't been able to answer
> the customer.
Sorry I fail to understand what you mean with "legal"? Are you
wondering about license restrictions? There are none.
As for compatibility, that's what major version numbers are for. This
is not a PostgreSQL topic, but a general system one as for instance the
same holds for libc.
Michael
--
Michael Meskes
Michael at Fam-Meskes dot De, Michael at Meskes dot (De|Com|Net|Org)
Meskes at (Debian|Postgresql) dot Org
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