Re: [Haskelldb-users] Compiling with GHC 6.4, HSQL, and MySQL

[Krasimir A. <ka2...@ya...>]

Hello, Guys

The Cabal support in HSQL is still half-baked. I was a
little bit off in the last few months but now I will
have more free time and I will complete the next HSQL
release. I am sorry for this inconvenience but after
all I am working on HSQL only in my free time. I also
thought how to separate the different backends in
HSQL. The new Cabalized version will have multiple
packages. One common and one for each backend. These
will be really small - usually only one module. The
advantage is that you will be able to have multiple
backends installed but your program will be linked
only with the backend which you like. I saw that under
Linux if you have multiple backends installed but you
are using only one of them then the program will be
linked to all backends. This isn't the case with
Windows. Under Windows the linker will choice the
right backend automatically. I don't know why this
happens under Linux but it seems that the above is the
only available solution. Another advantage is that
when one day we have real support for Haskell .dll/.so
compilation then I will be able to load the backend
package dynamically. I hope that this compilation mode
will be available soon. It is already working for
MacOS and was working under Windows (currently
requires some kind of repairing).
The disadvantage is that the user will have to build
manually each package. Cabal still doesn't support
shipments.

Cheers,
  Krasimir

--- Bjorn Bringert <bri...@cs...> wrote:

> Robert van Herk wrote:
> > I think that Setup.hs in the repos together with
> the cabal file could be 
> > used to compile with GHC 6.4 and PostgreSQL
> support.
> > 
> > However, I would like to compile with GHC 6.4,
> HSQL, and MySQL (and NO 
> > PostgreSQL).
> > 
> > When I try runhaskell Setup.hs build, I get:
> > 
> > $ runhaskell Setup.hs build
> > Preprocessing library haskelldb-0.9...
> > can't find source for
> Database.HaskellDB.HSQL.PostgreSQL in ["build/ghc"]
> > 
> > In the output of "runhaskell Setup.hs configure",
> I don't see anything 
> > trying to look for availability of PostgreSQL
> either. Is there an easy 
> > solution to this?
> 
> Short answer: no, there is no easy answer. As far as
> I know anyway.
> 
> Does anyone have an idea about how we should handle
> HSQL providing only 
> some backends, and how we should handle
> conditionally compiling only 
> some backends? This is now done with configure, but
> using plain Cabal 
> would be nice.
> 
> Maybe we could always provide all backends, but use
> CPP to make the 
> unavailable ones dummies that fail at runtime?
> 
> /Björn
> 
> 
>
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