From cdd6ddad6f6efb4874b83ac08c9616daafe07293 Mon Sep 17 00:00:00 2001
From: Artemis Tosini <me@artem.ist>
Date: Sun, 12 Nov 2023 01:16:34 +0000
Subject: [PATCH] Able to build zephyr toolchains

---
 flake.nix                     | 21 ++++++++----------
 packages/zephyr/default.nix   |  8 ++++++-
 packages/zephyr/toolchain.nix | 42 +++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+), 13 deletions(-)
 create mode 100644 packages/zephyr/toolchain.nix

diff --git a/flake.nix b/flake.nix
index d86b028..53e6f9a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,21 +1,18 @@
 {
   description = "artemist's NixOS packages and shells for development";
-  
+
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, utils }: utils.lib.eachDefaultSystem (system:
-    let
-      pkgs = import nixpkgs { inherit system; };
-    in
-    {
-      packages = {
-        zephyr = pkgs.callPackage ./packages/zephyr { };
-      };
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachDefaultSystem (system:
+      let pkgs = import nixpkgs { inherit system; };
+      in {
+        packages = { zephyr = pkgs.callPackage ./packages/zephyr { }; };
 
-      formatter = pkgs.nixfmt;
-    });
-  }
+        formatter = pkgs.nixfmt;
+      });
+}
 
diff --git a/packages/zephyr/default.nix b/packages/zephyr/default.nix
index 19fe43e..6844833 100644
--- a/packages/zephyr/default.nix
+++ b/packages/zephyr/default.nix
@@ -1,8 +1,14 @@
 { callPackage, stdenv, lib }:
 let assets = lib.importJSON ./assets.json;
-in {
+in rec {
   host-tools = callPackage ./host-tools.nix {
     inherit (assets) version hosts;
     sources = assets.host_tools;
   };
+
+  toolchains = lib.mapAttrs (target: sources:
+    callPackage ./toolchain.nix {
+      inherit target sources;
+      inherit (assets) version hosts;
+    }) assets.toolchains;
 }
diff --git a/packages/zephyr/toolchain.nix b/packages/zephyr/toolchain.nix
new file mode 100644
index 0000000..e59c52e
--- /dev/null
+++ b/packages/zephyr/toolchain.nix
@@ -0,0 +1,42 @@
+{ stdenv, lib, fetchurl, autoPatchelfHook, target, sources, version, hosts }:
+
+stdenv.mkDerivation {
+  pname = "zephyr-toolchain-${target}";
+  inherit version;
+
+  src = fetchurl (sources."${stdenv.hostPlatform.system}");
+
+  dontConfigure = true;
+  dontUnpack = true;
+  dontBuild = true;
+  # If we're building the same architecture as the target it will mess with files like
+  # crt1.o, so use autopatchelf and only some files
+  dontPatchELF = true;
+  dontAutoPatchelf = true;
+  nativeBuildInputs = [ autoPatchelfHook ];
+  autoPatchelfIgnoreMissingDeps = [ "libpython*" ];
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p "$out"
+    tar -C "$out" -xvf "$src"
+    runHook postInstall
+  '';
+
+  preFixup = ''
+    autoPatchelf ${target}/bin
+    autoPatchelf ${target}/${target}/bin
+    autoPatchelf ${target}/lib/bfd-plugins
+    autoPatchelf ${target}/lib/gcc/${target}/*/plugin ${target}/libexec/gcc/${target}
+    echo "done with my autopatchelf"
+  '';
+
+  meta = with lib; {
+    homepage = "https://www.zephyrproject.org/";
+    description =
+      "Toolchain for building Zephyr for the ${target} architecture";
+    license = licenses.asl20;
+    platforms = hosts;
+    maintainers = with maintainers; [ artemist ];
+  };
+}