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Bug#722880: apt: Apt fails to solve some dependencies in a multiarch scenario.



Hi Gustavo,

I have attached a small testcase which setups up an environment as you
seem to describe it (runable if you drop it into apt/test/integration).

"Unfortunately" the script has the expected output, so I suspect
I have misunderstood you, which, given that many terms in MultiArch
are overloaded isn't exactly hard, so don't worry, your bugreport is fine. :)

I will still comment on the two cases, even if I am wrong though:

On Sat, Sep 14, 2013 at 8:19 AM, Gustavo Prado Alkmim
<alkmim@ic.unicamp.br> wrote:
> First case: I was trying to crossbuild a source package A that build-depends
> package B:armhf where the build architecture is amd64 and the host
> architecture is armhf. Package B is multiarch: foreign. Apt install package
> B:armhf instead of B:amd64 even B being a multiarch: foreign package. IMHO, apt
> should install B:amd64 to solve the build-dependencies instead of B:armhf.

The explicit mentioning of an architecture is only for special cases and
in those special cases they should overrule the 'normal' behavior.
Why are you build-depending explicitly on a B:armhf if any B would do otherwise?


> Second case: I was trying to crossbuild a source package A that build-depends
> package B:any that depends package C:all where the build architecture is amd64
> and the host architecture is armhf. Package B is multiarch: same and Package C
> is multiarch: foreign. Apt fails to solve the dependencies because it tries to
> install package C:armhf instead of Package C:all which is a multiarch: foreign
> package. IMHO, apt should install Package C:all without returning error.

As the script shows, I can't reproduce this.

Note that arch:all packages are currently interpreted as being arch:any
(which are only available for your native architecture) by design.
It tends to confuse people, but was needed for transition reasons.
(There are discussions ongoing to resolve a few issues with that though.)


Best regards

David Kalnischkies

Attachment: test-bug-722880
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