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

Wed Mar 4 09:31:54 UTC 2015

Hey,

Little addition to what Michael already sent you.

To get ‘the latest’ you should build from sources :D

But in case it’s ok for you to have ghc 7.8.3 and you don’t want to ./configure; make; make install, you might also check this installation script on github.

On March 4, 2015 at 11:28:50, Michael Snoyman (michael at snoyman.com) wrote:

I'd recommend looking at:

http://www.stackage.org/install#mac-os-x
https://github.com/bitemyapp/learnhaskell/blob/master/README.md#mac-os-x

I don't generally recommend using the platform installer, it ends up pegging libraries to old versions which causes dependency problems, or in some cases have known bugs.

On Wed, Mar 4, 2015 at 11:26 AM emacstheviking <objitsu at gmail.com> wrote:
Agreed Michael!

I am currently wiping all Mac Ports packages and I will perform a clean up of /Library/Haskell etc.

What is the *preferred* way to get the lastest for OSX: Using homebrew, macports or the Haskell Platform. I *used* to use the platform installer but for some reason (cabal I expect!) I started trying out other ways...

I think actually I will go the platform packager again...

On 4 March 2015 at 09:13, Michael Snoyman <michael at snoyman.com> wrote:
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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