Failed to build as part of system flake

[mikeshepherd]

I'm attempting to use nix-ld in my system, I have added it to my flake as described in the readme:

flake.nix

  inputs = {
    ...
    nixpkgs-for-nix-ld.url = "github:NixOS/nixpkgs/20f77aa09916374aa3141cbc605c955626762c9a";
    nix-ld = {
      url = "github:Mic92/nix-ld";
      inputs.nixpkgs.follows = "nixpkgs-for-nix-ld";
    };
  };
  outputs = { nixpkgs, home-manager, self, nix-ld, ... }@inputs:
    ...
    modules = [
      ...
      nix-ld.nixosModules.nix-ld
      { programs.nix-ld.dev.enable = true; }
    ];

flake.lock

    "nix-ld": {
      "inputs": {
        "flake-compat": "flake-compat",
        "flake-utils": "flake-utils",
        "nixpkgs": [
          "nixpkgs-for-nix-ld"
        ]
      },
      "locked": {
        "lastModified": 1721411691,
        "narHash": "sha256-fN0NjkYcQrdVSvWlSnvdu8XD34q8tl84SEz5BOJYROA=",
        "owner": "Mic92",
        "repo": "nix-ld",
        "rev": "7a990656e51465a18ba70f49c2cf9c8d0947b4c9",
        "type": "github"
      },
      "original": {
        "owner": "Mic92",
        "repo": "nix-ld",
        "type": "github"
      }
    },

but when I run nixos-rebuild switch the build fails with compile errors in nix-ld

@nix { "action": "setPhase", "phase": "unpackPhase" }
Running phase: unpackPhase
unpacking source archive /nix/store/gmf0lm6gyarlrgqvl2i9hjgdywlwyj9w-84khmnncb095j174g25zb1cq99i8lfi0-source
source root is 84khmnncb095j174g25zb1cq99i8lfi0-source
Executing cargoSetupPostUnpackHook
Finished cargoSetupPostUnpackHook
@nix { "action": "setPhase", "phase": "patchPhase" }
Running phase: patchPhase
Executing cargoSetupPostPatchHook
Validating consistency between /build/84khmnncb095j174g25zb1cq99i8lfi0-source/Cargo.lock and /build/cargo-vendor-dir/Cargo.lock
Finished cargoSetupPostPatchHook
@nix { "action": "setPhase", "phase": "updateAutotoolsGnuConfigScriptsPhase" }
Running phase: updateAutotoolsGnuConfigScriptsPhase
@nix { "action": "setPhase", "phase": "configurePhase" }
Running phase: configurePhase
@nix { "action": "setPhase", "phase": "buildPhase" }
Running phase: buildPhase
Executing cargoBuildHook
++ env CC_X86_64_UNKNOWN_LINUX_GNU=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/cc CXX_X86_64_UNKNOWN_LINUX_GNU=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/c++ CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/cc CC_X86_64_UNKNOWN_LINUX_GNU=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/cc CXX_X86_64_UNKNOWN_LINUX_GNU=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/c++ CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/cc CARGO_BUILD_TARGET=x86_64-unknown-linux-gnu HOST_CC=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/cc HOST_CXX=/nix/store/ihhhd1r1a2wb4ndm24rnm83rfnjw5n0z-gcc-wrapper-12.3.0/bin/c++ cargo build -j 12 --target x86_64-unknown-linux-gnu --frozen --profile release
   Compiling proc-macro2 v0.4.30
   Compiling unicode-xid v0.1.0
   Compiling syn v0.15.44
   Compiling heapless v0.8.0
   Compiling byteorder v1.5.0
   Compiling cc v1.1.6
   Compiling stable_deref_trait v1.2.0
   Compiling plain v0.2.3
   Compiling scroll v0.12.0
   Compiling linux-raw-sys v0.6.4
   Compiling constcat v0.5.0
   Compiling log v0.4.22
   Compiling cfg-match v0.2.1
   Compiling embedded-io v0.6.1
   Compiling hash32 v0.3.1
   Compiling goblin v0.8.2
   Compiling quote v0.6.13
   Compiling nix-ld v2.0.0 (/build/84khmnncb095j174g25zb1cq99i8lfi0-source)
   Compiling default-env v0.1.1
error: `MaybeUninit::<T>::zeroed` is not yet stable as a const fn
  --> src/arch.rs:54:37
   |
54 | pub const NIX_LD_SYSTEM_ENV: &str = concat!("NIX_LD_", NIX_SYSTEM);
   |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add `#![feature(const_maybe_uninit_zeroed)]` to the crate attributes to enable
   = note: this error originates in the macro `$crate::_concat_slices` which comes from the expansion of the macro `concat` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `MaybeUninit::<T>::zeroed` is not yet stable as a const fn
  --> src/arch.rs:55:50
   |
55 | pub const NIX_LD_LIBRARY_PATH_SYSTEM_ENV: &str = concat!("NIX_LD_LIBRARY_PATH_", NIX_SYSTEM);
   |                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add `#![feature(const_maybe_uninit_zeroed)]` to the crate attributes to enable
   = note: this error originates in the macro `$crate::_concat_slices` which comes from the expansion of the macro `concat` (in Nightly builds, run with -Z macro-backtrace for more info)

error: `MaybeUninit::<T>::zeroed` is not yet stable as a const fn
  --> src/main.rs:34:41
   |
34 |       CStr::from_bytes_with_nul_unchecked(concat_slices!([u8]:
   |  _________________________________________^
35 | |         default_env!("DEFAULT_NIX_LD", "/run/current-system/sw/share/nix-ld/lib/ld.so").as_bytes(),
36 | |         b"\0"
37 | |     ))
   | |_____^
   |
   = help: add `#![feature(const_maybe_uninit_zeroed)]` to the crate attributes to enable
   = note: this error originates in the macro `$crate::_concat_slices` which comes from the expansion of the macro `concat_slices` (in Nightly builds, run with -Z macro-backtrace for more info)

error: could not evaluate constant pattern
  --> src/main.rs:85:13
   |
85 |             NIX_LD_SYSTEM_ENV_BYTES => {
   |             ^^^^^^^^^^^^^^^^^^^^^^^

error: could not evaluate constant pattern
  --> src/main.rs:91:13
   |
91 |             NIX_LD_LIBRARY_PATH_SYSTEM_ENV_BYTES => {
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: unreachable pattern
  --> src/main.rs:88:13
   |
85 |             NIX_LD_SYSTEM_ENV_BYTES => {
   |             ----------------------- matches any value
...
88 |             b"NIX_LD" => {
   |             ^^^^^^^^^ unreachable pattern
   |
   = note: `#[warn(unreachable_patterns)]` on by default

warning: unreachable pattern
  --> src/main.rs:91:13
   |
85 |             NIX_LD_SYSTEM_ENV_BYTES => {
   |             ----------------------- matches any value
...
91 |             NIX_LD_LIBRARY_PATH_SYSTEM_ENV_BYTES => {
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable pattern

warning: unreachable pattern
  --> src/main.rs:94:13
   |
85 |             NIX_LD_SYSTEM_ENV_BYTES => {
   |             ----------------------- matches any value
...
94 |             b"NIX_LD_LIBRARY_PATH" => {
   |             ^^^^^^^^^^^^^^^^^^^^^^ unreachable pattern

warning: unreachable pattern
  --> src/main.rs:97:13
   |
85 |             NIX_LD_SYSTEM_ENV_BYTES => {
   |             ----------------------- matches any value
...
97 |             b"LD_LIBRARY_PATH" => {
   |             ^^^^^^^^^^^^^^^^^^ unreachable pattern

warning: unreachable pattern
   --> src/main.rs:100:13
    |
85  |             NIX_LD_SYSTEM_ENV_BYTES => {
    |             ----------------------- matches any value
...
100 |             _ => {}
    |             ^ unreachable pattern

warning: `nix-ld` (bin "nix-ld") generated 5 warnings
error: could not compile `nix-ld` (bin "nix-ld") due to 5 previous errors; 5 warnings emitted

Checking out the repository directly to the same commit that is in the flake.lock and compiling there works just fine

[Mic92]

What branch are you running on? I only test this for nixos-unstable. If you are on nixos stable, it might be better to just use the version that is part of nixpkgs.