I’ve been trying to set up my environment to work with rust. I followed a similar path to here: installed rustup with nix-env, and ended up with
cargo run answering with:
error: linker ` cc ` not found
I figured things would get better if I installed gcc in my user profile, just to try (i know, use nix-shell instead). So I tried
nix-env -iA nixos.gcc which replied:
installing 'gcc-wrapper-9.3.0' building '/nix/store/4v0073lgw6yql2j3bcza5glqfcl5cf0x-user-environment.drv'... error: packages '/nix/store/8pbwywcj6vbswz7xmy2dh716x8blgh8w-gcc-wrapper-9.3.0/bin/ld.gold' and '/nix/store/5sj06x18pd8an12ndl65hlwmp8afnrwa-binutils-wrapper-2.31.1/bin/ld.gold' have the same priority 10; use 'nix-env --set-flag priority NUMBER INSTALLED_PKGNAME' to change the priority of one of the conflicting packages (0 being the highest priority)
To continue my quick and dirty attempt to try and make things work, I tried setting the priority of something to some number… but I’m unable to find a valid package name to set the flag:
> nix-env --set-flag priority 5 nixos.gcc-wrapper error: selector 'nixos.gcc-wrapper' matches no derivations
(I tried all sorts of variants of derivation “names”: gcc, nixos.gcc, gcc-wrapper, gcc-wrapper-9.3.0, I admit that I don’t really know what I’m doing anymore)
I have two question:
- How do you set a priority?
- How do you properly handle conflicting packages? Is the conflict a mere result of trying to put stuff in my user profile with nix-env inappropriately, and would it never happen if I were to do things in a nix-er way?
The end of the story is that I created a
buildInput = [pkgs.rustup pkgs.gcc] and everything works. I don’t know if that’s the best way to go, but I want to use rustup rather than a pure nix way because I feel like it’ll ease interactions with other rust developers not using nix.