Cabal trouble

[Alp Mestanogullari]

Appending `--allow-newer=template-haskell` should tell cabal to ignore
upper bounds on that package and consider more recent versions as well. In
case the problem really just has to do with bounds and the code itself
doesn't care, this should allow you to successfully build that package. You
could also say `--allow-newer=exceptions:template-haskell` to ask cabal to
ignore the upper bounds that the exceptions package puts on
template-haskell. [1] has more to say about option.

[1]:
https://cabal.readthedocs.io/en/stable/nix-local-build.html#cfg-flag---allow-newer

On Wed, Mar 28, 2018 at 9:33 AM, Simon Peyton Jones via ghc-devs <
ghc-devs at haskell.org> wrote:

> Trying to build the repro case in Trac #14208, I get this
>
> cabal install --with-ghc=/home/simonpj/5builds/ghc-8.4-branch/
> inplace/bin/ghc-stage2
>
> Warning: cannot determine version of /home/simonpj/.cabal/bin/c2hs :
>
> ""
>
> Resolving dependencies...
>
> cabal: Could not resolve dependencies:
>
> trying: exceptions-0.8.3 (dependency of streamly)
>
> next goal: template-haskell (dependency of exceptions)
>
> rejecting: template-haskell-2.13.0.0/installed-2.1... (conflict:
> exceptions =>
>
> template-haskell>=2.2 && <2.13)
>
> rejecting: template-haskell-2.12.0.0, template-haskell-2.11.1.0,
>
> template-haskell-2.11.0.0, template-haskell-2.10.0.0,
>
> template-haskell-2.9.0.0, template-haskell-2.8.0.0,
> template-haskell-2.7.0.0,
>
> template-haskell-2.6.0.0, template-haskell-2.5.0.0,
> template-haskell-2.4.0.1,
>
> template-haskell-2.4.0.0, template-haskell-2.3.0.1,
> template-haskell-2.3.0.0,
>
> template-haskell-2.2.0.0 (constraint from non-upgradeable package requires
>
> installed instance)
>
> After searching the rest of the dependency tree exhaustively, these were
> the
>
> goals I've had most trouble fulfilling: template-haskell, exceptions,
>
> streamly, transformers, base
>
> This is with my in-place build of GHC-8.4 (in-place but not modified in
> any way).  I’ve done a ‘cabal upate’.
>
> What am I doing wrong?
>
> Thanks
>
> Simon
>
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>
>


-- 
Alp Mestanogullari
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