[Haskell-cafe] GHC and backwards compatibility

[Joe Q]

This is definitely an issue with the array package not setting the right
minimum versions. You should email the maintainer.
On Aug 19, 2013 11:05 AM, "Ketil Malde" <ketil at malde.org> wrote:

>
> I recently encountered the following problem:
>
>
> --------------------------------------------------------------------------------
> $ cabal install
> Resolving dependencies...
> Configuring array-0.4.0.1...
> Building array-0.4.0.1...
> Preprocessing library array-0.4.0.1...
>
> Data/Array/IArray.hs:1:14: Unsupported extension: Trustworthy
> cabal: Error: some packages failed to install:
> array-0.4.0.1 failed during the building phase. The exception was:
> ExitFailure 1
> asmeval-0 depends on array-0.4.0.1 which failed to install.
> binary-0.7.1.0 depends on array-0.4.0.1 which failed to install.
> biocore-0.3.1 depends on array-0.4.0.1 which failed to install.
> biofasta-0.0.3 depends on array-0.4.0.1 which failed to install.
> biopsl-0.4 depends on array-0.4.0.1 which failed to install.
> biosff-0.3.3 depends on array-0.4.0.1 which failed to install.
> bytestring-0.10.2.0 depends on array-0.4.0.1 which failed to install.
> containers-0.5.2.1 depends on array-0.4.0.1 which failed to install.
> deepseq-1.3.0.1 depends on array-0.4.0.1 which failed to install.
> hashable-1.2.0.10 depends on array-0.4.0.1 which failed to install.
> stringable-0.1.1 depends on array-0.4.0.1 which failed to install.
> system-filepath-0.4.7 depends on array-0.4.0.1 which failed to install.
> text-0.11.3.1 depends on array-0.4.0.1 which failed to install.
> unordered-containers-0.2.3.1 depends on array-0.4.0.1 which failed to
> install.
>
> --------------------------------------------------------------------------------
>
> The installed GHC is 7.0.4, and yes, that's many major versions ago, but
> then again, it's only two years old, and from what I understand, it is
> shipped by some conservative Linux distributions.
>
> The problems here are that:
>
> a) the installation tries to install array, but current array requires
> the "Trustworthy" extension, which appeared in 7.2.1.  Ideally, packages
> should try to be backwards compatible, e.g. by using conditional
> sections.
>
> b) the output isn't very helpful in tracking down the cause of this
> problem, it claims that all these packages depend on array-0.4.0.1,
> which is a lie.  Somewhere, somehow, somethings depends on this (or at
> least a newer version), but I have no clue how to figure out which,
> except examining each of these packages and their dependencies manually.
>
> It is also possible that array shouldn't be upgraded like this, but then
> that needs to be made clear to cabal somehow, so that I don't spend ages
> trying to.
>
> Are there any solutions to this?  Advice on how to proceed?
>
> -k
> --
> If I haven't seen further, it is by standing in the footprints of giants
>
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