rpi cross-compilation wip

Author: functora

nix/misc.nix

@@ -1,7 +1,7 @@
 let
   repo = builtins.toString ./..;
 in
-  with (import ./project.nix); rec {
+  with (import ./project.nix {}); rec {
     pkgBin = pkg: "${pkgs.${pkg}}/bin/${pkg}";
     nix-bundle = pkgs.nix-bundle.overrideAttrs (attrs: {
       buildInputs =

nix/project.nix

@@ -1,4 +1,4 @@
-let
+{crossSystem ? null}: let
   # Read in the Niv sources
   sources = import ./sources.nix {};
   # If ./nix/sources.nix file is not found run:
@@ -21,18 +21,33 @@ let
     # the haskell.nix functionality itself as an overlay.
     haskellNix.nixpkgsArgs;
 
+  # Apply crossSystem if needed
+  next =
+    if crossSystem == null
+    then pkgs
+    else
+      import haskellNix.sources.nixpkgs-unstable (
+        haskellNix.nixpkgsArgs
+        // {
+          crossSystem = pkgs.lib.systems.examples."${crossSystem}";
+        }
+      );
+
   # Nixpkgs overlay to fix haskell tdlib bindings.
   pkgs = prev.extend (
-    next: prev: {tdjson = prev.tdlib;}
+    _: x: {tdjson = x.tdlib;}
   );
 in
-  pkgs.haskell-nix.project {
+  next.haskell-nix.project {
     # 'cleanGit' cleans a source directory based on the files known by git
     src = pkgs.haskell-nix.haskellLib.cleanGit {
       name = "functora";
       src = ./..;
     };
     # Specify the GHC version to use.
-    compiler-nix-name = "ghc948"; # Not required for `stack.yaml` based projects.
+    #
+    # NOTE : Fallback from 948 to 928 for aarch64 cross support.
+    #
+    compiler-nix-name = "ghc928"; # Not required for `stack.yaml` based projects.
     projectFileName = "cabal.project";
   }

nix/shell.nix

@@ -1,4 +1,4 @@
-with (import ./project.nix); let
+with (import ./project.nix {}); let
   misc = import ./misc.nix;
   newpkgs = import ./newpkgs.nix;
 in

nix/tools.nix

@@ -1,4 +1,4 @@
-with (import ./project.nix);
+with (import ./project.nix {});
 with pkgs; let
   newpkgs = import ./newpkgs.nix;
   repoDir = builtins.toString ./..;

prv

@@ -1,14 +1,13 @@
-with (import ./../../../nix/project.nix);
-with pkgs;
-let pkgDir = builtins.toString ./..;
-    ghcidDazzleMain = writeShellScriptBin "ghcid-dazzle-main" ''
-      (cd ${pkgDir} && ${ghcid}/bin/ghcid --command="${hpack}/bin/hpack ${pkgDir} && cabal new-repl dazzle-exe --disable-optimization --repl-options=-fobject-code --repl-options=-fno-break-on-exception --repl-options=-fno-break-on-error --repl-options=-v1 --repl-options=-ferror-spans --repl-options=-j -fghcid")
-    '';
-    ghcidDazzleTest = writeShellScriptBin "ghcid-dazzle-test" ''
-      (cd ${pkgDir} && ${ghcid}/bin/ghcid --test=":main --fail-fast --color -f failed-examples" --command="${hpack}/bin/hpack ${pkgDir} && cabal new-repl dazzle-test --disable-optimization --repl-options=-fobject-code --repl-options=-fno-break-on-exception --repl-options=-fno-break-on-error --repl-options=-v1 --repl-options=-ferror-spans --repl-options=-j -fghcid")
-    '';
-in
-[
+with (import ./../../../nix/project.nix {});
+with pkgs; let
+  pkgDir = builtins.toString ./..;
+  ghcidDazzleMain = writeShellScriptBin "ghcid-dazzle-main" ''
+    (cd ${pkgDir} && ${ghcid}/bin/ghcid --command="${hpack}/bin/hpack ${pkgDir} && cabal new-repl dazzle-exe --disable-optimization --repl-options=-fobject-code --repl-options=-fno-break-on-exception --repl-options=-fno-break-on-error --repl-options=-v1 --repl-options=-ferror-spans --repl-options=-j -fghcid")
+  '';
+  ghcidDazzleTest = writeShellScriptBin "ghcid-dazzle-test" ''
+    (cd ${pkgDir} && ${ghcid}/bin/ghcid --test=":main --fail-fast --color -f failed-examples" --command="${hpack}/bin/hpack ${pkgDir} && cabal new-repl dazzle-test --disable-optimization --repl-options=-fobject-code --repl-options=-fno-break-on-exception --repl-options=-fno-break-on-error --repl-options=-v1 --repl-options=-ferror-spans --repl-options=-j -fghcid")
+  '';
+in [
   ghcidDazzleMain
   ghcidDazzleTest
 ]

pub/dazzle/nix/tools.nix

@@ -1,4 +1,4 @@
-with (import ./../../../nix/project.nix);
+with (import ./../../../nix/project.nix {});
 with pkgs; let
   cabal = "${pkgs.cabal-install}/bin/cabal";
   pkgDir = builtins.toString ./..;