-

these derivations will be built:
  /nix/store/78rr58d98r169klc8s0z5jqznv6d5w4x-hello.drv
building path(s) ‘/nix/store/xni68x865kn6i2pqx3zdlcq0q7f8g2dr-hello’
unpacking sources
unpacking source archive /nix/store/9ljssglw74jabzzsqsl3lim4d5jgh4ya-empty
source root is empty
/nix/store/iwa35vp5b9rg5jlpxplivl2dhy5spxza-set-source-date-epoch-to-latest.sh: line 12: [: : integer expression expected
patching sources
configuring
no configure script, doing nothing
building
[1 of 1] Compiling Main             ( Main.hs, Main.o )
Linking Main ...
/nix/store/f1jlykqf0fga6z21innh4x11cdi1hr6h-arm-unknown-linux-gnueabihf-binutils-2.28/bin/arm-unknown-linux-gnueabihf-ld.gold: fatal error: /nix/store/5k51ci1wj0sfshi6xz8myz2mi6w6c9gg-arm-unknown-linux-gnueabihf-ghc-8.1.20170106/lib/arm-unknown-linux-gnueabihf-ghc-8.1.20170106/ghc-prim-0.5.0.0/libHSghc-prim-0.5.0.0.a(CString.o): unsupported ELF machine number 0
collect2: error: ld returned 1 exit status
`arm-unknown-linux-gnueabihf-cc' failed in phase `Linker'. (Exit code: 1)
builder for ‘/nix/store/78rr58d98r169klc8s0z5jqznv6d5w4x-hello.drv’ failed with exit code 1
error: build of ‘/nix/store/78rr58d98r169klc8s0z5jqznv6d5w4x-hello.drv’ failed

default.nix

let 
  crossSystem = pkgs.lib.systems.examples.armv7l-hf-multiplatform;

  # crossSystem = {
  #   config = "arm-linux-gnueabihf";
  #   platform = platform;
  #   libc = "glibc";
  #   arch = "arm";
  #   float = "hard";
  #   fpu = "vfp";
  #   withTLS = true;
  #   gcc = platform.gcc;
  #   openssl.system = "linux-generic32";
  # };

  crossPkgs = import /home/jophish/src/nixpkgs { inherit crossSystem; };

  pkgs = import /home/jophish/src/nixpkgs {};

  ghc = crossPkgs.buildPackages.haskell.compiler.ghcHEAD;

  hello = { stdenv }:
    stdenv.mkDerivation {
      name = "hello";

      src = ./empty;

      buildPhase = ''
        cat <<EOF > hello.c
        #include <stdio.h>
        int main(int argc, char const* argv[]){
          puts("hello, world!");
          return 0;
        }
        EOF

        $CC -s hello.c -o hello -v
      '';

      installPhase = ''
        mkdir -p $out
        cp hello $out/
      '';
    };

  helloHaskell = { stdenvNoCC, ghcCross }:
    stdenvNoCC.mkDerivation {
      name = "hello";

      src = ./empty;

      buildPhase = ''
        cat <<EOF > Main.hs
        module Main where

        main = putStrLn "Hello, ARM!" 
        EOF

        ${ghcCross}/bin/arm-unknown-linux-gnueabihf-ghc Main.hs \
          # -optl-s \
          # -optl-static-libgcc
      '';

      installPhase = ''
        mkdir -p $out
        mv Main $out/
      '';
    };

in {
  hh = crossPkgs.callPackage helloHaskell { ghcCross = ghc; };
  # nc = crossPkgs.netcat;
  # g = crossPkgs.buildPackages.gcc.cc;
}