Bug#752989: libio-callback-perl: FTBFS with Perl 5.20: alternative dependencies

[Jonas Smedegaard]

Quoting Jonas Smedegaard (2014-06-28 19:09:32)
> Quoting Niko Tyni (2014-06-28 09:03:08)
>> Perhaps something like this (untested) could work?
>>
>>   Build-Depends: perl (>= 5.17.1~) | libmodule-build-perl (>= 0.40), libmodule-build-perl
>>
>> (The unversioned dependency would guarantee either a perl version with
>>  the bundled M::B, or a separate package. The versioned alternative
>>  would guarantee that the M::B version is new enough.)
>>
>> I suppose we'll have to teach lintian new tricks too at some point...
>
> Reading your original suggestion again, I realize it does indeed work 
> - also for my pedantic view: An additional detail I forgot to take 
> into account is that fallback build-dependencies are ignored on 
> official build daemons where deterministic resolving is important.
>
> Sorry if you felt this thread was too long - and thanks for opening my 
> eyes to a more compact way of expressing this kind of issue than I'd 
> come up with.

Hmm, I am getting doubts again...

Niko's declaration, with Gregor's correction, is this:

  Build-Depends: perl (>= 5.17.1~) | libmodule-build-perl (>= 0.400000), libmodule-build-perl

That declaration relies on the assumption that any system with a new 
enough perl will also have a new enough libmodule-build-perl - either 
provided by perl(-modules) or standalone.  Is that safe to assume?

I believe this more strict declaration covers that cornercase:

  Build-Depends: perl (>= 5.17.1~) | libmodule-build-perl (>= 0.400000), libmodule-build-perl (>= 0.400000) | perl (<< 5.21~)

Both those two declarations need two parts, so none of them can 
currently be handled my Config::Model, as I understand it.


 - Jonas

-- 
 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

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