Building vector with GHC HEAD

[Roman Cheplyaka]

See http://bit.ly/1CDVOIZ

On 17/02/15 15:19, Jan Stolarek wrote:
> Devs,
> 
> I'm not sure if this is the best place to ask this question but I'm almost certain someone here 
> will have the answer. I want to build upstream master branch of vector library using GHC HEAD and 
> cabal 1.22. Alas my attempts have failed:
> 
> $ git clone git at github.com:haskell/vector.git
> $ cd vector
> $ cabal sandbox init
> $ cabal install -w /dane/projekty/ghc/build/inplace/bin/ghc-stage2
> Resolving dependencies...
> cabal: Could not resolve dependencies:
> trying: vector-0.11.0.0 (user goal)
> trying: base-4.8.0.0/installed-inp... (dependency of vector-0.11.0.0)
> next goal: deepseq (dependency of vector-0.11.0.0)
> rejecting: deepseq-1.4.0.0/installed-inp..., 1.4.0.0 (conflict: vector =>
> deepseq>=1.1 && <1.4)
> rejecting: deepseq-1.3.0.2 (conflict: base==4.8.0.0/installed-inp..., deepseq
> => base>=4.3 && <4.8)
> trying: deepseq-1.3.0.1
> next goal: array (dependency of deepseq-1.3.0.1)
> rejecting: array-0.5.0.1/installed-inp..., 0.5.0.0 (conflict: deepseq =>
> array>=0.1 && <0.5)
> rejecting: array-0.4.0.1 (conflict: base==4.8.0.0/installed-inp..., array =>
> base>=4.2 && <4.7)
> rejecting: array-0.4.0.0 (conflict: base==4.8.0.0/installed-inp..., array =>
> base>=4.2 && <4.6)
> rejecting: array-0.3.0.3 (conflict: base==4.8.0.0/installed-inp..., array =>
> base>=4.2 && <4.5)
> rejecting: array-0.3.0.2, 0.3.0.1 (conflict: base==4.8.0.0/installed-inp...,
> array => base>=4.2 && <4.4)
> rejecting: array-0.3.0.0 (conflict: base==4.8.0.0/installed-inp..., array =>
> base>=3 && <4.4)
> rejecting: array-0.2.0.0, 0.1.0.0 (conflict: base==4.8.0.0/installed-inp...,
> array => base<4.3)
> Dependency tree exhaustively searched.
> 
> The problem arises from vector requiring deepseq < 1.4 when intree package db contains deepseq 
> 1.4. Removing the upper bound on deepseq in vector.cabal allows to resolve dependencies but ends 
> with a build error:
> 
> Data/Vector/Primitive/Mutable.hs:78:10:
>     No instance for (GHC.Generics.Generic (MVector s a))
>       arising from a use of ‘Control.DeepSeq.$gdmrnf’
>     In the expression: Control.DeepSeq.$gdmrnf
>     In an equation for ‘rnf’: rnf = Control.DeepSeq.$gdmrnf
>     In the instance declaration for ‘NFData (MVector s a)’
> 
> Fixing this error (importing GHC.Generics & deriving `Generic` instance for `MVector s a`) leads 
> to another one:
> 
> Data/Vector/Primitive/Mutable.hs:80:10:
>     No instance for (Control.DeepSeq.GNFData (Rep (MVector s a)))
>       arising from a use of ‘Control.DeepSeq.$gdmrnf’
>     In the expression: Control.DeepSeq.$gdmrnf
>     In an equation for ‘rnf’: rnf = Control.DeepSeq.$gdmrnf
>     In the instance declaration for ‘NFData (MVector s a)’
> 
> This time I have no idea how to fix it since GNFData is an internal class of Control.Deepseq 
> module. Help?
> 
> Aside: at first I thought vector is one of the boot libraries since it is kept in the source tree. 
> But then I realized it is not being build during bootstrapping. Why do we keep it in the source 
> tree then?
> 
> Janek
> 
> ---
> Politechnika Łódzka
> Lodz University of Technology
> 
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