On 06/12/2013 01:19 AM, Nikita Karetnikov wrote:
I'm trying to install several versions of GHC. There are two problems:1. According to this page [1], it should be possible to use multiple versions at once. But 'nix-env -iA' always replaces the previous version. For example, if I run the following commands: # nix-env -iA nixpkgs.haskellPackages_ghc6104.ghc # nix-env -iA nixpkgs.haskellPackages_ghc762.ghc my profile will only contain 'ghc-7.6.2', not both. I can "switch" to 6.10.4 if I execute the first command again. But the mentioned page says that it's only necessary "to invoke the versioned binaries [...] in order to get the correct instance."
Installing multiple versions at once does *not* imply installing them into one profile. What would "ghc" command do?? However, any user can use any number of profiles, e.g. people do that they create a profile for every project they're working on... because you might want a different GHC there than you're using as normal user.
Vlada
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