2010/03/16 Brandon S. Allbery KF8NH
On Mar 16, 2010, at 20:59 , Mark Wotton wrote:
Do we have any similar system for ghc/cabal? I quite frequently find myself switching between 6.10 and 6.12 for various things, and it's always a bit painful to get your environment up to speed. Is there a golden road for this stuff, or do the compiler hackers here just munge the PATH?
Both the system and user package databases handle multiple compiler versions, and Cabal inherits this so should do the right thing for the most part.
The GHC environment I've assembled for campus machines installs versioned commands (including adding versions to the commands that lack them), then a script uses the machine configuration db to install symlinks for the default version.
While I've not worked with it much, Nix seems like a complete, well-thought system for building out multi-versioned package installations. Have you looked at it? What do you think? Finding myself in a similar situation, I wonder if it's not ultimately better to leverage the work of the Nix team, instead of building a "simpler" system for Haskell (and then later for Ruby and then...). -- Jason Dusek