How to structure your Haskell installation?
Hi. I'm installing the Haskell Platform om my Linux box and need some tips on how to structure the files on the OS. I need to install and use both GHC 6.12.3 and GHC 7.0.2. Hence I want to separate these installations. I've setup two directories, one for each platform (related to the GHC): # ls -d -1 $PWD/*.* /usr/haskell/2010.2.0.0 /usr/haskell/2011.2.0.0 I've installed GHC-6.12.3 in "2010.2.0.0" and will install GHC-7.0.2 in "2011.2.0.0". My question is more related to where I should install the packages. When I install a package using "runhaskell Setup ..." I assumed this to ONLY be installed for the version of GHC I'm using when installing it. Am I right about this? Having $PATH pointing to GHC-6.12.3 I've done this when installing packages, to add them to "2010.2.0.0": - - - - - - - cd /usr/src wget http://hackage.haskell.org/packages/archive/transformers/0.2.2.0/transformer... tar xzf transformers-0.2.2.0.tar.gz cd transformers-0.2.2.0 runhaskell Setup configure --prefix=/usr/haskell/2010.2.0.0/ runhaskell Setup build runhaskell Setup install - - - - - - - Later when I switch to GHC-7.0.2 I plan to install the packages into the "2011.2.0.0" directory in stead. Is this a good way to structure several Haskell installations on the same system? Is there a "best practice" on how to structure the files? I want to get this right from the start, to avoid having to go back and re-arrange everything. Regards, Frode K [k]
On Tuesday 22 March 2011 13:31:44, frode k wrote:
Hi.
I'm installing the Haskell Platform om my Linux box and need some tips on how to structure the files on the OS. I need to install and use both GHC 6.12.3 and GHC 7.0.2. Hence I want to separate these installations. I've setup two directories, one for each platform (related to the GHC):
# ls -d -1 $PWD/*.* /usr/haskell/2010.2.0.0 /usr/haskell/2011.2.0.0
I've installed GHC-6.12.3 in "2010.2.0.0" and will install GHC-7.0.2 in "2011.2.0.0".
My question is more related to where I should install the packages. When I install a package using "runhaskell Setup ..." I assumed this to ONLY be installed for the version of GHC I'm using when installing it. Am I right about this?
Yes. A package can only be installed for the compiler it was compiled with, so to install it for multiple compilers you have to compile it repeatedly.
Having $PATH pointing to GHC-6.12.3 I've done this when installing packages, to add them to "2010.2.0.0": - - - - - - - cd /usr/src wget http://hackage.haskell.org/packages/archive/transformers/0.2.2.0/transfo rmers-0.2.2.0.tar.gz tar xzf transformers-0.2.2.0.tar.gz cd transformers-0.2.2.0 runhaskell Setup configure --prefix=/usr/haskell/2010.2.0.0/ runhaskell Setup build runhaskell Setup install - - - - - - -
Install cabal-install, then $ cabal install --with-compiler=/path/to/desired/ghc wanted-package takes care of it automatically (after tweaking the settings in cabal's config file). And it gets necessary Haskell dependencies automatically and installs them, too.
Later when I switch to GHC-7.0.2 I plan to install the packages into the "2011.2.0.0" directory in stead.
Is this a good way to structure several Haskell installations on the same system? Is there a "best practice" on how to structure the files?
Don't know. I have everything under $HOME and let GHC and cabal figure out how to organise packages. Works for me™.
I want to get this right from the start, to avoid having to go back and re-arrange everything.
Regards, Frode K
[k]
Thanks for your feedback, it helped me setting up both GHC 7.0.2 and 6.12.3 in parallel, and Cabal-install with the edited configuration file made it all much easier. I only needed GHC 6.12.3 for building 7.0.2, hence I did not bother installing / building Cabal-install for 6.12.3. I did document the entire process here: http://klevstul.posterous.com/haskell-ghc-702-on-centos-55 [k]
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Daniel Fischer -
frode k