cabal: Could not resolve dependencies

[reedrosenbluth]

I can't seem to get cabal to install this library. Here's the error:

Resolving dependencies...
cabal: Could not resolve dependencies:
trying: Bang-0.1.1.0 (user goal)
trying: base-4.8.1.0/installed-075... (dependency of Bang-0.1.1.0)
next goal: time (dependency of Bang-0.1.1.0)
rejecting: time-1.5.0.1/installed-710..., 1.5.0.1, 1.5 (conflict: Bang =>
time>=1.4.2 && <1.5)
trying: time-1.4.2
next goal: deepseq (dependency of time-1.4.2)
rejecting: deepseq-1.4.1.1/installed-5de..., 1.4.1.2, 1.4.1.1, 1.4.1.0,
1.4.0.0 (conflict: time => deepseq>=1.1 && <1.4)
rejecting: deepseq-1.3.0.2 (conflict: base==4.8.1.0/installed-075..., deepseq
=> base>=4.3 && <4.8)
trying: deepseq-1.3.0.1
next goal: array (dependency of deepseq-1.3.0.1)
rejecting: array-0.5.1.0/installed-d42..., 0.5.1.0, 0.5.0.0 (conflict: deepseq
=> array>=0.1 && <0.5)
rejecting: array-0.4.0.1 (conflict: base==4.8.1.0/installed-075..., array =>
base>=4.2 && <4.7)
rejecting: array-0.4.0.0 (conflict: base==4.8.1.0/installed-075..., array =>
base>=4.2 && <4.6)
rejecting: array-0.3.0.3 (conflict: base==4.8.1.0/installed-075..., array =>
base>=4.2 && <4.5)
rejecting: array-0.3.0.2, 0.3.0.1 (conflict: base==4.8.1.0/installed-075...,
array => base>=4.2 && <4.4)
rejecting: array-0.3.0.0 (conflict: base==4.8.1.0/installed-075..., array =>
base>=3 && <4.4)
rejecting: array-0.2.0.0, 0.1.0.0 (conflict: base==4.8.1.0/installed-075...,
array => base<4.3)
Dependency tree exhaustively searched.

[5outh]

Thank you for your feedback! I'll look into it soon, and specifically I'd like to get the library building with stack soon.

Have you tried installing it into a sandbox, by the way? That would narrow down some issues related to "cabal hell"

[reedrosenbluth]

Sandbox doesn't appear to change anything

[5outh]

@reedrosenbluth Good to know, I'll see if I can find some time this weekend to patch this up.

[reedrosenbluth]

Thanks!

[5outh]

I've been trying to get this working with stack; unfortunately I'm running into an error mentioned here commercialhaskell/stack#740 regarding hmidi. Not sure what the solution is yet.

[samdoshi]

@reedrosenbluth looks like you're building with GHC 7.10.2 which comes with base-4.8.1.0, which is in conflict with time < 1.5 (via deepseq).

Either: switch to GHC 7.8.4 (or lts-2.22 if you're using stack), or @5outh could fiddle with the package bounds to get it to compile on 7.10.2.

@5outh I'm not getting the linking error anymore using OSX 10.10 and stack 0.1.6.0, but the issue related to the framework option in the .cabal file, see here haskell/cabal#2715 for more info, the otool -L command is very useful for debugging.

I've also submitted #7 to add a working stack.yaml, it's lts-2.22 / GHC 7.84, let me know if you want me to get an lts-3 version working instead.

[5outh]

@samdoshi Cool! Since Bang is a somewhat standalone library, I think sticking with GHC 7.8 is fine. Thanks for the PR as well 🎉

[5outh]

Should be fixed now!

[samdoshi]

The only thing to watch out for with 7.8 is that it doesn't work on El Capitan at the moment, 7.8.5 is supposed to be out at some point to resolve that.

Cool project by the way 👍

[5outh]

Good to know, thanks again :)

[5outh]

New version is up which should work with stack install. Waiting on stack to recognize the new package version; I'll close it when I can successfully stack install globally.

[samdoshi]

Just had a quick go trying to get this to build with 7.10.2 and lts-3.11, looks like that framework linking bug isn't fixed after all. It appears to fixed in both GHC and Cabal but unreleased as yet.

https://ghc.haskell.org/trac/ghc/ticket/10568

[5outh]

Good to know, I'll keep an eye on the ticket.

[5outh]

stack install Bang --resolver=lts-2.22 should work now.

[reedrosenbluth]

So this won't work with GHC 7.10.2?

[5outh]

Unfortunately no, not yet. :( But, as @samdoshi mentioned, once the new GHC/Cabal are released it should be fixed.