bug: rustc missing library iconv on darwin

[neosimsim]

Issue description

I installed rust and cargo using the following flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    home-manager.url = "github:nix-community/home-manager";
  };

  outputs = { self, nixpkgs, home-manager }: {

    homeConfigurations."neosimsim" = home-manager.lib.homeManagerConfiguration {

      pkgs = nixpkgs.legacyPackages.aarch64-darwin;

      modules = [
        ({ config, pkgs, ... }: {
          nix = {
            package = pkgs.nix;
            settings.experimental-features = [
              "nix-command"
              "flakes"
            ];
          };

          programs.home-manager.enable = true;

          home = {
            stateVersion = "22.05";
            username = "neosimsim";
            homeDirectory = "/Users/neosimsim";
            packages = with pkgs; [
              git
              fish
              rustc
              cargo
              clang
            ];
          };
        })
      ];
    };

  };
}

But when I try compile the following main.rs

fn main() {
    // Statements here are executed when the compiled binary is called

    // Print text to the console
    println!("Hello World!");
}

The build failed with

$ rustc main.rs
error: linking with `cc` failed: exit status: 1
  |
  = note: "cc" "-arch" "arm64" "/var/folders/tc/tmq0yq29117br__lmw5_3c7c0000gp/T/rustcsU4rQM/symbols.o" "main.main.dd7fc0f6-cgu.0.rcgu.o" "main.main.dd7fc0f6-cgu.1.rcgu.o" "main.main.dd7fc0f6-cgu.2.rcgu.o" "main.main.dd7fc0f6-cgu.3.rcgu.o" "main.main.dd7fc0f6-cgu.4.rcgu.o" "main.main.dd7fc0f6-cgu.5.rcgu.o" "main.main.dd7fc0f6-cgu.6.rcgu.o" "main.main.dd7fc0f6-cgu.7.rcgu.o" "main.s32jh9uv6aqhr3e.rcgu.o" "-L" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libstd-08068d401c25d211.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libpanic_unwind-84be07e68b9d00f4.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libobject-4804c562fc61a807.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libmemchr-279301e6a5d99fea.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libaddr2line-fbfb344f09805b90.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libgimli-616191dd1d974165.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/librustc_demangle-4687ef078813d96d.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libstd_detect-1386b7e41dd1fd86.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libhashbrown-26b1aa4af9d5f07a.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libminiz_oxide-8a7d5d906c81e365.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libadler-327750ded6594992.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/librustc_std_workspace_alloc-b801be618a24f1bf.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libunwind-fa75ed5f72174942.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libcfg_if-adf0011e71898575.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/liblibc-3d5bcaabca1cfe44.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/liballoc-cd287cf1e41c0ec4.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/librustc_std_workspace_core-d99e291378cbf0b8.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libcore-fcdbad0d5b23b740.rlib" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib/libcompiler_builtins-9ba449e7b506e8b4.rlib" "-lSystem" "-lresolv" "-lc" "-lm" "-liconv" "-L" "/nix/store/y1zgd02zpwwd71i41riyyq7rs6l20sqs-rustc-1.64.0/lib/rustlib/aarch64-apple-darwin/lib" "-o" "main" "-Wl,-dead_strip" "-nodefaultlibs"
  = note: ld: library not found for -liconv
          clang-11: error: linker command failed with exit code 1 (use -v to see invocation)
          

error: aborting due to previous error

I could fix my setup by adding

home.sessionVariables.LIBRARY_PATH = ''${lib.makeLibraryPath [pkgs.libiconv]}''${LIBRARY_PATH:+:$LIBRARY_PATH}'';
programs.fish.enable = true;

But I have the impression this should not be necessary.

Maintainer CC

No response

System information

- system: `"aarch64-darwin"`
 - host os: `Darwin 21.5.0, macOS 12.4`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.9.0`
 - channels(root): `"nixpkgs"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixpkgs`

[luxus]

@neosimsim any updates on this? did you found a better solution?

[neosimsim]

@neosimsim any updates on this? did you found a better solution?

Not yet, no.

[LucianDavies]

I have this same problem also..

[ncfavier]

This is unrelated to Home Manager and a duplicate of NixOS/nixpkgs#206242.

[ncfavier]

Note that rust 1.66 (which apparently fixes the issue out of the box) is in nixpkgs unstable already, so you might want to use rustc from unstable.

[neosimsim]

Yes it works. Thanks for the hint.

[rupurt]

@ncfavier I'm still running into this problem with rustc 1.75.0 (82e1608df 2023-12-21) (built from a source tarball) which is installed as a nix package

[theoparis]

Same issue here, I ended up following the fix referenced in the commit above which involves conditionally adding libiconv to buildInputs.

[alyssais]

Generally libiconv should be depended on unconditionally, as it's not part of libc on more platforms than just Darwin, and it's a no-op on platforms where it is part of libc (most Linux ones).