Update to Firebird 3.0

[Michael Stahl]

On 10.06.2016 12:58, Bunth Tamás wrote:
> The engine path issue is solved.
> 
> As I see, the following TODOs left:
> 
> - Add tommath to external dependencies. I guess it's just a row
> somewhere, not a big deal.

there is a comment in ExternalProject_firebird.mk that essentially says
that firebird 2.5 bundles tommath (and atomic_ops) - is that no longer
the case in 3.0?

i suggest if at all possible prefer to use what's bundled in firebird
already, that should save you a ton of makefile writing.

> - Older odb files (with fb. 2.5) should work with the new version. If
> the older one is stored as an archive file, than the newer version
> should open the archived file.
> See: http://www.firebirdsql.org/file/documentation/release_notes/html/en/3_0/rnfb30-apiods.html

as Lionel mentioned, we never used the archive format.

but i don't think it's particularly important to load existing 2.5
files, because the feature has been "experimental" all the time and no
end user should trust their important data with it.

it would be very useful to know if this archive format as written by 3.0
is going to be readable with future versions of firebird, once the
feature becomes non-experimental we really need this sort of
compatibility or we can never upgrade firebird.