cabal install version selection

[Christian Höner zu Siederdissen-2]

Hi everybody,

I fail to remember or re-google the package version selection for cabal,
if no version constraints are given.

If I depend on "iteratee", and there are no constraints, does it take
the lowest version?


When I pushed the newest version of the RNAFold package, the log showed
iteratee-0.1.0 to be used, which failed of course:
http://hackage.haskell.org/packages/archive/RNAFold/1.99.1.0/logs/failure/ghc-7.4

It got really weird, however when I saw that the dependency
BiobaseVienna-0.2.2.3, which is the one actually using iteratee, was
built correctly.

Of course, seeing the error of my way, I have started adding more
version constraints to every package I maintain.



Gruss,
Christian

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[Albert Y. C. Lai]

On 12-03-30 06:37 PM, Christian Höner zu Siederdissen wrote:
> I fail to remember or re-google the package version selection for cabal,
> if no version constraints are given.
>
> If I depend on "iteratee", and there are no constraints, does it take
> the lowest version?

It takes the highest version.

To verify, I fetched RNAFold.cabal of 1.99.1.0 and tried:

cabal install --dry-run

Its answer:

Resolving dependencies...
In order, the following would be installed (use -v for more details):
ListLike-3.1.4
MonadCatchIO-transformers-0.2.2.3
OneTuple-0.2.1
PrimitiveArray-0.2.1.1
ADPfusion-0.0.1.0
bytestring-lexing-0.4.0
cmdargs-0.9.5
csv-0.1.2
file-embed-0.0.4.1
iteratee-0.8.8.1
...

It chooses the newest iteratee alright.

I don't know what is going on with hackage's build bot. And I can't
control it anyway.


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[Christian Höner zu Siederdissen-2]

Thanks,

that was a rather curious problem then. With more version annotations,
hackage compiled everything.

Thanks for for testing!

Gruss,
Christian

* Albert Y. C. Lai <[hidden email]> [31.03.2012 03:58]:

> On 12-03-30 06:37 PM, Christian Höner zu Siederdissen wrote:
> >I fail to remember or re-google the package version selection for cabal,
> >if no version constraints are given.
> >
> >If I depend on "iteratee", and there are no constraints, does it take
> >the lowest version?
>
> It takes the highest version.
>
> To verify, I fetched RNAFold.cabal of 1.99.1.0 and tried:
>
> cabal install --dry-run
>
> Its answer:
>
> Resolving dependencies...
> In order, the following would be installed (use -v for more details):
> ListLike-3.1.4
> MonadCatchIO-transformers-0.2.2.3
> OneTuple-0.2.1
> PrimitiveArray-0.2.1.1
> ADPfusion-0.0.1.0
> bytestring-lexing-0.4.0
> cmdargs-0.9.5
> csv-0.1.2
> file-embed-0.0.4.1
> iteratee-0.8.8.1
> ...
>
> It chooses the newest iteratee alright.
>
> I don't know what is going on with hackage's build bot. And I can't
> control it anyway.
>
>
> _______________________________________________
> Glasgow-haskell-users mailing list
> [hidden email]
> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users

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