[Nix-dev] Unable to install clang/llvm 3.9

[Layus]

Hi,

You can install llvm with |nix-env -iA nixos.llvm nixos.clang| (replace 
|nixos| by |nixpkgs| if you are not using NixOS).
If you want a specific version, you can install llvm_XX and clang_XX as 
in |nix-env -iA nixos.llvm_34 nixos.clang_34|.

For your issue, it arises because you want to install “llvm” which 
exists in different versions.
Usually we provide a default one, but it seems currently broken in your 
channel.
The fix I provide installs the package by its attribute name (|-A| 
option), whis is, by construction, unique.

nix-env is unable to pick the right llvm/clang amongst:

|$ nix-env -qaP llvm nixos.llvm_34 llvm-3.4.2 nixos.llvm_35 llvm-3.5.2 
nixos.llvm_36 llvm-3.6.2 nixos.llvm llvm-3.7.1 nixos.llvm_38 llvm-3.8.0 
$ nix-env -qaP clang-wrapper nixos.clangSelf clang-wrapper-3.4.2 
nixos.clang_34 clang-wrapper-3.4.2 nixos.clang_35 clang-wrapper-3.5.2 
nixos.clang_36 clang-wrapper-3.6.2 nixos.clang clang-wrapper-3.7.1 
nixos.clang_38 clang-wrapper-3.8.0 |

— Layus.

On 12/09/16 18:58, Wink Saville wrote:

> I'm unable to install clang/llvm 3.9.0:
>
> [wink at vps1:~]$ nix-env -qa llvm
> warning: name collision in input Nix expressions, skipping
> ‘/home/wink/.nix-defexpr/channels_root/nixos’
> llvm-3.4.2
> llvm-3.5.2
> llvm-3.6.2
> llvm-3.7.1
> llvm-3.8.0
>
> [wink at vps1:~]$ nix-env -qa clang
> warning: name collision in input Nix expressions, skipping
> ‘/home/wink/.nix-defexpr/channels_root/nixos’
> clang-3.7.1
>
>
>
> I'm currently on nixos-unstable-small:
>
> [wink at vps1:~]$ nix-channel --list
> nixos https://nixos.org/channels/nixos-unstable-small
>
>
> What am I doing wrong?
>
> -- Wink
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> nix-dev at lists.science.uu.nl
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