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

[gregor herrmann]

On Wed, 02 Jul 2014 22:02:32 +0300, Niko Tyni wrote:

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

> > For a future perl-modules 5.22, if the Breaks is kept, everything
> > should be fine. If the Breaks is dropped there is indeed a loophole
> > (for versions >= 0.420500), if I'm seeing this correctly.
> I expect to drop the Breaks will be dropped when Module::Build is dropped.
> Their purpose is to prevent an older separate package overriding a newer
> one in the Perl core.
> 
> I don't understand the "(for versions >= 0.420500)" part above. Surely
> any Module::Build version >= 0.420500 is fine? Did you mean
> "(for versions <= 0.400000)"?

Looks like my brain was twisted again :)
I was thinking about a situation when a newer Module::Build might be
needed in the future, and perl 5.22 doesn't Breaks older versions of
libmodule-build-perl; but then the part left of the comma in the
original example needs to be rewritten anyway.

Phew :)
 
> > >   Build-Depends: perl (>= 5.17.1~) | libmodule-build-perl (>= 0.400000), libmodule-build-perl (>= 0.400000) | perl (<< 5.21~)
> > (I guess I'd still go for a plain 'libmodule-build-perl (>= 0.400000)'.
> > If only to save us all from further headaches :))
> I agree a plain libmodule-build-perl (>= 0.400000) is a good way
> forward. It's a bit suboptimal for backporting as it unnecessarily pulls
> in the separate package on older systems, but should still work. And
> it's simple and the right thing for >= 5.20.

Maybe a comment in d/control would help backporters?
Nothing I'd propose to do for every package but it's a possibility
...
 

Cheers,
gregor

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