I am trying to override rustc with a version that has support for compiling to ESP32 (https://github.com/esp-rs/rust).
This is what my flake looks currently looks like.
{
inputs = {
nixpkgs.url = "github:nixos/nixpkgs";
esp-rust-src = {
url = "github:esp-rs/rust";
flake = false;
};
};
outputs = { self, nixpkgs, esp-rust-src, }:
let
system = "x86_64-linux";
myOverlay = (final: prev: {
rustc = prev.rustc.overrideAttrs (finalAttrs: old: (lib.trace (builtins.attrNames old) {
src = prev.lib.cleanSource esp-rust-src.outPath;
postConfigure = ''
./configure --experimental-targets=Xtensa --release-channel=nightly --enable-extended --tools=clippy,cargo,rustfmt --enable-lld
'';
}));
});
overlays = [ (myOverlay) ];
pkgs = import nixpkgs {
inherit system overlays;
};
lib = pkgs.lib;
in
{
devShells.x86_64-linux.default = pkgs.mkShell {
packages = with pkgs; [
nil
nixpkgs-fmt
rustc
cargo
];
};
};
}
To my current question. As I understand it, the old function parameter that is provided from overrideAttrs should be the attrset which is passed to the stdenv.mkDerivation function. Then why does it appear like not all attributes are traced out?
trace: [ "buildCommand" "enableParallelBuilding" "env" "meta" "name" "outputs" "passAsFile" "passthru" "preferLocalBuild" "strictDeps" ]
If I compare this to GitHub master https://github.com/NixOS/nixpkgs/blob/d02d818f22c777aa4e854efc3242ec451e5d462a/pkgs/development/compilers/rust/rustc.nix#L284, multiple attributes are missing like postPatch, stripDebugList, __darwinAllowLocalNetworking and many more.
And yes, I just ran nix flake update.