clangd: binary not present

[vale981]

Describe the bug
A clear and concise description of what the bug is.

/nix/store/sjvafn1hkr1cksby9dalrvmli6ymdb1z-clang-tools-12.0.0/bin/clangd: line 27: /nix/store/scx436nnh1nrfkwk7fla0rhf1ax5ys4k-clang-12.0.0/bin/clangd: No such file or directory

and

ls /nix/store/scx436nnh1nrfkwk7fla0rhf1ax5ys4k-clang-12.0.0/bin/
clang    clang-12     clang-cl   clang-extdef-mapping  clang-offload-bundler  clang-refactor  clang-scan-deps  diagtool  scan-build
clang++  clang-check  clang-cpp  clang-format          clang-offload-wrapper  clang-rename    cpp              hmaptool

To Reproduce

1. nix-shell -p clang-tools
2. clangd

Expected behavior
Clangd should launch.

Notify maintainers
@aherrmann

Metadata

 - system: `"x86_64-linux"`
 - host os: `Linux 5.12.9-zen1, NixOS, 21.11pre299299.3a8d7958a61 (Porcupine)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.12`
 - channels(root): `"nixos-21.11pre299299.3a8d7958a61, nixos-stable-20.03.3328.6d1a044fc9f, nixos-unstable"`
 - channels(hiro): `"nixos-21.11pre299299.3a8d7958a61"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[vale981]

llvmPackages_12.clang-unwrapped does not seem to have clangd

[endofunky]

This is causing me trouble right now as well. Perhaps an issue in the unpackPhase for clang 12:

    unpackPhase = ''
      unpackFile $src
      mv clang-* clang
      sourceRoot=$PWD/clang
      unpackFile ${clang-tools-extra_src}
    '';

For previous clang versions it includes an extra mv:

   unpackPhase = ''
      unpackFile $src
      mv clang-* clang
      sourceRoot=$PWD/clang
      unpackFile ${clang-tools-extra_src}
      mv clang-tools-extra-* $sourceRoot/tools/extra
    '';

[Mic92]

I fixed it but I would appreciate if someone on macOS could give this a test build.

[robertodr]

I'm seeing this again with nixos-unstable and version 13.0.0 of clang-tools:

/nix/store/pkc8gzxdxp71b0x8940kgjc1h2m4qzd0-clang-tools-13.0.0/bin/clangd: line 27: /nix/store/1f8vwdir1p2z48ppqm6zcm29y73r2q1x-clang-13.0.0/bin/clangd: No such file or directory