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Re: Build-Depend on virtual packages

Steve Langasek <vorlon@debian.org> writes:

> On Mon, Jun 13, 2005 at 10:15:30AM +0200, Stefano Zacchiroli wrote:
>> [ Mail-Followup-To: set to debian-mentors only ]
>> On Mon, Jun 13, 2005 at 09:57:25AM +0200, Goswin von Brederlow wrote:
>> > You can't Build-Depend on virtual packages.
>> Ok, time to settle down this issue.
>> We do, all ocaml packages build depends on ocaml-3.08.3 a virtual
>> package provided by ocaml. What's the problem with that? It has worked
>> properly for two years or so.
> Then you've been lucky.  I don't think I've ever seen a clear statement that
> virtual build dependencies *should* work, but they usually *do* work --
> *except* when there are bugs, which has happened from time to time.  It
> seems that sbuild particularly likes to object to build-dependencies on
> virtual packages that were once real packages (e.g., libmysqlclient-dev ->
> libmysqlclient12-dev).  As a result, it seems to generally be more robust to
> build-dep on a real package when possible.

apt-get complains if there is more than one source of the provides
(even two sources with the same name/version). sbuild then picks the
first choice apt lists for the provides which is non deterministic and
strongly discouraged.

As I said in the past this needs a real metapackage that then depends
on the actual ocaml package.


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