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Rust: Difference between revisions

944 bytes added ,  23 February 2022
→‎FAQ: Add instructions using makeRustPlatform
imported>Asymmetric
imported>Asymmetric
(→‎FAQ: Add instructions using makeRustPlatform)
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Note that you need to use a <code>nix-shell</code> environment. Installing the Nix packages <code>openssl</code> or <code>sqlite</code> globally under <code>systemPackages</code> in NixOS or in <code>nix-env</code> [https://nixos.wiki/wiki/FAQ/I_installed_a_library_but_my_compiler_is_not_finding_it._Why%3F is discouraged] and doesn't always work (<code>pkg-config</code> may not be able to locate the libraries).
Note that you need to use a <code>nix-shell</code> environment. Installing the Nix packages <code>openssl</code> or <code>sqlite</code> globally under <code>systemPackages</code> in NixOS or in <code>nix-env</code> [https://nixos.wiki/wiki/FAQ/I_installed_a_library_but_my_compiler_is_not_finding_it._Why%3F is discouraged] and doesn't always work (<code>pkg-config</code> may not be able to locate the libraries).
=== Building with a different Rust version than the one in Nixpkgs ===
The following uses the [https://github.com/nix-community/fenix fenix] overlay and <code>makeRustPlatform</code> to build a crate with Rust nightly:
<syntaxHighlight lang=nix>
{
  inputs = {
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };
  outputs = { self, fenix, flake-utils, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system}; in
      {
        defaultPackage = (pkgs.makeRustPlatform {
          inherit (fenix.packages.${system}.minimal) cargo rustc;
        }).buildRustPackage {
          pname = "hello";
          version = "0.1.0";
          src = ./.;
          cargoSha256 = nixpkgs.lib.fakeSha256;
        };
      });
}
</syntaxHighlight>
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