[Nix-dev] Using several versions of GHC at once

[Nikita Karetnikov]

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."

2. At least two packages fail to install and I'm not sure how to fix
   that:

   # nix-env -iA nixpkgs.haskellPackages_ghc6121.ghc
   replacing old `ghc-6.10.4-wrapper'
   installing `ghc-6.12.1-wrapper'
   these derivations will be built:
   /nix/store/47gc3i410nyzmjkd1r75x7r0g2w04bj6-ghc-6.10.1-binary.drv
   /nix/store/i7ag249kahjdsvy8nsqqbjms0x4rdqdv-ghc-6.12.1-wrapper.drv
   /nix/store/phlg265h0xi3ggj4sw9hwg0aijzkyhm5-ghc-6.12.1.drv
   building path(s) `/nix/store/w6arbz8j98w51w1y830ym0aighjngs9m-ghc-6.10.1-binary'
   building /nix/store/w6arbz8j98w51w1y830ym0aighjngs9m-ghc-6.10.1-binary
   unpacking sources
   unpacking source archive /nix/store/b1vg6v3gih9nl7v7vc28biv9qxixxnff-ghc-6.10.1-i386-unknown-linux.tar.bz2
   source root is ghc-6.10.1
   missing ELF header
   not an ELF executable
   not an ELF executable
   not an ELF executable
   not an ELF executable
   not an ELF executable
   patching sources
   configuring
   /nix/store/f2rwkyd9yb6s5cdvmy7ydh9yd5bqd1hi-stdenv/setup: ./configure: /bin/sh: bad interpreter: No such file or directory
   builder for `/nix/store/47gc3i410nyzmjkd1r75x7r0g2w04bj6-ghc-6.10.1-binary.drv' failed with exit code 126
   cannot build derivation `/nix/store/phlg265h0xi3ggj4sw9hwg0aijzkyhm5-ghc-6.12.1.drv': 1 dependencies couldn't be built
   cannot build derivation `/nix/store/i7ag249kahjdsvy8nsqqbjms0x4rdqdv-ghc-6.12.1-wrapper.drv': 1 dependencies couldn't be built
   error: build of `/nix/store/i7ag249kahjdsvy8nsqqbjms0x4rdqdv-ghc-6.12.1-wrapper.drv' failed

   Why is it trying to build 'binary' for 6.10.1?

   Here is my '/usr/local/etc/nix/nix.conf':

   build-users-group = nixbld
   build-use-chroot = true
   build-chroot-dirs = /dev /proc /bin

   # nix-env -iA nixpkgs.haskellPackages_ghc6104.binary
   installing `haskell-binary-ghc6.10.4-0.7.1.0'
   these derivations will be built:
   /nix/store/all8ad8p8sy28dzcxqvy7b9sminvvvl5-binary-0.7.1.0.tar.gz.drv
   /nix/store/f89qf3z81qchzy5y9ls9mnqrknnp53xw-haskell-binary-ghc6.10.4-0.7.1.0.drv
   /nix/store/j2p6lck8jcgxzwmavpxm6fbc0b4vipav-mirrors-list.drv

   [...]

   [1 of 1] Compiling Main             ( Setup.lhs, Setup.o )
   Linking Setup ...
   configure flags: --disable-library-profiling --enable-split-objs 
   Warning: binary.cabal: This package requires Cabal version: >=1.8
   Warning: binary.cabal: Ignoring unknown section type: test-suite
   Warning: binary.cabal: Ignoring unknown section type: test-suite
   Warning: binary.cabal: Ignoring unknown section type: benchmark
   Warning: binary.cabal: Ignoring unknown section type: benchmark
   Warning: binary.cabal: Ignoring unknown section type: benchmark
   Error: This package requires Cabal version: >=1.8
   Configuring binary-0.7.1.0...
   Flags chosen: development=False
   builder for `/nix/store/f89qf3z81qchzy5y9ls9mnqrknnp53xw-haskell-binary-ghc6.10.4-0.7.1.0.drv' failed with exit code 1
   error: build of `/nix/store/f89qf3z81qchzy5y9ls9mnqrknnp53xw-haskell-binary-ghc6.10.4-0.7.1.0.drv' failed

   I tried to install 'cabal-install' and several versions of
   'nixpkgs.haskellPackages_ghc6104.cabalInstall'.  It didn't help.

   (Note that I don't use NixOS, just Nix.)

[1] http://nixos.org/wiki/Haskell#Using_several_versions_of_GHC_at_once
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