I think you are looking for the `--preserve-installed` flag. # nix-env -iA nixpkgs.haskellPackages_ghc6104.ghc # nix-env --preserve-installed -iA nixpkgs.haskellPackages_ghc762.ghc
in this case ghc is mapped to ghc-6.10.4 and `ghc-7.6.2` is of course mapped to ghc-7.6.2. Patrick On Tue, Jun 11, 2013 at 6:19 PM, Nikita Karetnikov <nik...@karetnikov.org>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." > > 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 > > _______________________________________________ > nix-dev mailing list > nix-dev@lists.science.uu.nl > http://lists.science.uu.nl/mailman/listinfo/nix-dev > > -- Patrick Wheeler patrick.john.whee...@gmail.com patrick.j.whee...@rice.edu patrick.whee...@colorado.edu
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