Re: Which installation parts are backward compatible?

Michael Meskes wrote:
> On Thu, Feb 12, 2009 at 04:16:05PM +0200, Peter Eisentraut wrote:
>> Item        Compatible across major versions?
>>         (i.e. the 8.4 version works with 7.4+ server)
>> ...
>> ecpg        no?
> 
> It depends on which kind of compatibility you're looking for. The grammar
> accepted will surely be different. But running a new application with a new
> ecpglib against an old server works as long as libpq works. 

Will a program built with ecpg 8.4 run against a 7.4 server work the 
same as the same program built with ecpg 7.4 run against a 7.4 server? 
(This implies that the program uses only features present in 7.4.)