Ocaml-bjack.

[Reinhard Tartler]

On Mo, Sep 13, 2010 at 18:27:16 (CEST), Romain Beauxis wrote:

> Le lundi 13 septembre 2010 05:51:15, Reinhard Tartler a écrit :
>> On Fr, Sep 10, 2010 at 23:02:05 (CEST), Romain Beauxis wrote:
>> >       Hi all,
>> > 
>> > I just realized that the binNMU of libbjack-ocaml(-dev) was not
>> > sufficient  because libbjack-ocaml-dev declares a dependency on
>> > libjack-dev.
>> 
>> Sorry? I don't follow. can you please elaborate why this doesn't work?
>
> Sorry, I should have been more precise..
>
>> > I think it is reasonable to have a dependency on the -dev package of a
>> > library  when installing the corresponding ocaml -dev binding, so I want
>> > to know what to do now.
>> 
>> Do the ocaml jack bindings work with both jackd1 and jackd2? or do they
>> require a specific flavor? what about potential other jack
>> implementations like tschack?
>
>
> The bindings do not require any particular flavor. The problem is that any 
> program using libbjack-ocaml must compile against it, thus installing 
> libbjack-ocaml-dev.
>
> libbjack-ocaml-dev has a dependency on libjack-dev, which pulls jackd1. I 
> believe that instead one should be able to use any jack implementation for the 
> build.

AFAIUI, we want *everything* _compiled_ against the headers of
libjackd1.  The resulting binaries are then supposed to work at runtime
against both implementations. In fact, we install jackd2 by default.

> Also, when building liquidsoap inexperimental, I have a failure in cowbuilder 
> because some of the dependencies pull jack2 and ocaml-bjack pulls jack1.

ocaml-bjack Depends on libjack-jackd2-0 | libjack-0.116, i.e., it should
be installable with both jackd1 and jackd2, with a preference of
jackd2. This is intended.

If this is the symptom you try to fix, please elaborate on this
failure. I suspect the problem to be in your cowbuilder setup.

> Adding a dependency on the developpement package of the corresponding C 
> library in libbjack-ocaml-dev seems a reasonable requirement to me, though I 
> think it has been discussed in that past I think.

Please make it follow whatever is in the shlibs file of
libjack-jackd2-0, which contains libjack-jackd2-0 | libjack-0.116.
However, I don't really see the point in this dependency.

> The straight-forward solution would be to change this dependency to 
>   libjack-jackd2-dev | libjack-dev
> but I would like to know if this is the solution you would advise.

No, we really want to use the headers from the jackd1 implementation to
be used by default. This change would break that.

-- 
Gruesse/greetings,
Reinhard Tartler, KeyID 945348A4