[Haskell-cafe] Why does cabal select base-22.214.171.124 when
base-126.96.36.199 is available?
bjorn.buckwalter at gmail.com
Mon Apr 26 07:57:16 EDT 2010
On Mon, Apr 26, 2010 at 19:38, Ivan Lazar Miljenovic
<ivan.miljenovic at gmail.com> wrote:
> Bjorn Buckwalter <bjorn.buckwalter at gmail.com> writes:
>> Why does cabal seem to prefer base-188.8.131.52 over base-184.108.40.206 when
>> installing packages with an unqualified base requirement? Example:
> You mean cabal-install rather than Cabal. The reason that base-3 is
> chosen is because many of these old libraries won't build with base-4;
> as such, if no upper bound restriction is found on the base package then
> base-3 is chosen as it is more likely to work than base-4 (there were a
> _lot_ of breakages when base-4 first came out with 6.10.1).
I see, I guess that's pragmatic although the deprecation warning is unfortunate.
(I'm aware of the cabal-install versus Cabal distinction, but I
understand that cabal-install uses Cabal to resolve dependencies; thus
I assumed Cabal was the culprit.)
>> $ cabal install -v fad --reinstall
>> Resolving dependencies...
>> selecting fad-1.0 (hackage)
>> selecting base-220.127.116.11 (installed) and 18.104.22.168 (installed) and discarding
>> syb-0.1.0.0, 0.1.0.1, 0.1.0.2, 0.1.0.3, 0.2 and 0.2.1
>> Configuring fad-1.0...
>> Dependency base ==22.214.171.124: using base-126.96.36.199
>> [1 of 1] Compiling Numeric.FAD ( Numeric/FAD.hs, dist/build/Numeric/FAD.o )
>> Warning: Module `Prelude' is deprecated:
>> You are using the old package `base' version 3.x.
>> Future GHC versions will not support base version 3.x. You
>> should update your code to use the new base version 4.x.
> Ivan Lazar Miljenovic
> Ivan.Miljenovic at gmail.com
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