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ccls: Use latest llvmPackages #87848

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doronbehar commented May 14, 2020

Motivation for this change

In order to decrease overall closure size and to align with Nixpkgs' policy regarding the issue, packages which can work with the latest version of libfoo should use the latest version of it, even if libfoo points to libfoo2 while there's also libfoo3 available. This is influential on closure size in the following scenario:

  • A user installs Program A which depends on libfoo.
  • libfoo points to libfoo2.
  • There's also a libfoo_latest which points to libfoo3.
  • The user installs Program B which depends on libfoo_latest which is libfoo3.
  • Program A can work with both libfoo3 and libfoo2.

The result of this somewhat common pattern is that the user has both libfoo2 and libfoo_latest in their store, but it's not necessary because Program A can use libfoo_latest instead.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
On Darwin, according to ofborg the build fails but Linux should still
use the latest version if possible, see:
https://discourse.nixos.org/t/nixpkgs-policy-regarding-libraries-available-in-multiple-versions/7026
@doronbehar doronbehar force-pushed the doronbehar:improve-ccls branch from 0024d8a to 9b58388 May 31, 2020
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nixos-discourse commented May 31, 2020

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/nixpkgs-policy-regarding-libraries-available-in-multiple-versions/7026/4

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