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