[Haskell-beginners] LTS is good but...

[Michael Snoyman]

I can't really explain the details of what's going on here. It seems that
in some cases different versions of the executables are being found, but I
don't know why. Wiping out your sandbox (cabal sandbox delete) and starting
over may be sufficient to recover.

On Wed, Mar 4, 2015 at 11:11 AM emacstheviking <objitsu at gmail.com> wrote:

> As requested,
>
> iMac:~ vosabristol$ ghc --version
> The Glorious Glasgow Haskell Compilation System, version 7.8.3
>
> which ghc
> /opt/local/bin/ghc
>
> Hmm.... it shows a macports instsallation of GHC... but I am sure that's
> how I git it... I *used* to use the OSX installation package but I thought
> a clean start using MacPorts would somehow change the mood...
>
> iMac:~ vosabristol$ cabal --version
> cabal-install version 1.16.0.2
> using version 1.16.0 of the Cabal library
>
> iMac:~ vosabristol$ which cabal
> /usr/bin/cabal
>
> So... there is a possible case for *once again* performing a complete and
> utter removal of Haskell and its partners in crime and doing a fresh
> installation?
>
>
> Out of frustration I built OCaml and OPAM from sources last night but I'd
> still like to go with GHC!
>
> :)
>
>
> On 3 March 2015 at 20:43, Michael Snoyman <michael at snoyman.com> wrote:
>
>> Funny that there's an issue being discussed in the cabal issue tracker
>> right now[1] similar to this. But the report you're giving here is
>> particularly strange. Cabal-1.16 implies that you're using GHC 7.6, which
>> is supported by the claim that base 4.7 isn't available. I'd recommend
>> starting off with running the following commands and pasting the output:
>>
>> ghc --version
>> which ghc
>> cabal --version
>> which cabal
>>
>> [1] https://github.com/haskell/cabal/issues/2438
>>
>> On Tue, Mar 3, 2015 at 10:21 PM emacstheviking <objitsu at gmail.com> wrote:
>>
>>> Forgot to add that somehow, despite the upgrade, my cabal version has
>>> gone backwards from 1.20.0.1 to 1.16.0
>>>
>>> WTF?
>>>
>>>
>>> On 3 March 2015 at 20:19, emacstheviking <objitsu at gmail.com> wrote:
>>>
>>>> I started an OpenGL project within an LTS sandbox as guided on another
>>>> post and, somewhat foolishly it would see, I did a "cabal install
>>>> cabal-install" when prompted that a new version was available.
>>>>
>>>> The very next time I tried to work on my code.... I got this:
>>>>
>>>> bash-3.2$ pwd
>>>> /Users/seancharles/Documents/Coding/haskell/lts1
>>>> bash-3.2$ cabal build
>>>> cabal: You need to re-run the 'configure' command. The version of Cabal
>>>> being
>>>> used has changed (was Cabal-1.20.0.1, now Cabal-1.16.0).
>>>> bash-3.2$ cabal configure
>>>> Resolving dependencies...
>>>> Configuring lts1-0.1.0.0...
>>>> cabal: At least the following dependencies are missing:
>>>> base ==4.7.*
>>>> bash-3.2$ cabal build
>>>> cabal: You need to re-run the 'configure' command. The version of Cabal
>>>> being
>>>> used has changed (was Cabal-1.20.0.1, now Cabal-1.16.0).
>>>> bash-3.2$ ls -l
>>>> total 112
>>>> -rw-r--r--  1 seancharles  staff     19 Mar  2 12:53 LICENCSE
>>>> -rw-r--r--  1 seancharles  staff    552 Mar  3 20:09 Main.hs
>>>> -rw-r--r--  1 seancharles  staff    477 Mar  3 20:07 Main.hs~
>>>> -rw-r--r--  1 seancharles  staff     46 Mar  2 12:52 Setup.hs
>>>> -rw-r--r--  1 seancharles  staff  30198 Mar  2 12:51 cabal.config
>>>> -rw-r--r--  1 seancharles  staff   1090 Mar  2 12:51
>>>> cabal.sandbox.config
>>>> drwxr-xr-x  5 seancharles  staff    170 Mar  2 12:53 dist
>>>> -rw-r--r--  1 seancharles  staff   1932 Mar  2 12:52 lts1.cabal
>>>> bash-3.2$
>>>>
>>>> So, welcome to a different kind of hell, "cabal version hell" perhaps?
>>>>
>>>> Can anybody help me get it running again?
>>>> Thanks.
>>>> Sean.
>>>>
>>>>
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