nix-vcpkg-cross-experiment/nix/packages/test/package.nix

{
  lib
, src
, stdenv

, cmake
, vcpkg
, vcpkg-tool
, git
, curl
, cacert
, ninja
, pkg-config
, zip
}:
let
  deps = stdenv.mkDerivation {
    pname = "test-deps";
    version = "0.0.1";
    inherit src;

    outputHashAlgo = "sha256";
    outputHashMode = "recursive";
    outputHash = {
      "x86_64-linux" = "sha256-nFIbhVp32y+TlFLhuLc0XhlGJZmADgKBo4pd78H3mg8="; 
      # "x86_64-linux" = ""; 
      "aarch64-linux" = "";
      "armv7l-linux" = null;
    }.${stdenv.hostPlatform.system};

    dontConfigure = true;

    env = {
      VCPKG_ROOT = "${vcpkg}/share/vcpkg";
    };

    nativeBuildInputs = [
      # TODO: is this a direct $PATH dependency of `vcpkg install`?
      cmake

      # TODO: fix overriding the envvars in build script
      # vcpkg

      # TODO: wrap these in the $PATH of vcpkg-tool
      vcpkg-tool
      git
      curl
      cacert
      ninja
      zip

      # Only for fmt?
      pkg-config
    ];

    buildPhase = ''
      runHook preBuild

      mkdir -p "$out"

      vcpkg install \
        --x-buildtrees-root="$TMP/vcpkg_buildtrees" \
        --x-packages-root="$TMP/vcpkg_packages" \
        --only-downloads \
        --downloads-root="$out/vcpkg_downloads"

      runHook postBuild
    '';
        # --triplet="$VCPKG_DEFAULT_TRIPLET" \
        # --host-triplet="$VCPKG_DEFAULT_HOST_TRIPLET"

    dontInstall = true;
  };
in
stdenv.mkDerivation {
  pname = "test";
  version = "0.0.1";
  inherit src;

  nativeBuildInputs = [
    cmake

    vcpkg-tool
    git
    curl
    cacert
    ninja
    zip
  ];

  dontConfigure = true;

  env = {
    VCPKG_ROOT = "${vcpkg}/share/vcpkg";
  };

  buildPhase = let
    vcpkg-install-opts = lib.concatStringsSep " " [
      ''--x-buildtrees-root=$TMP/vcpkg_buildtrees''
      ''--x-packages-root=$TMP/vcpkg_packages''
      ''--downloads-root=${deps}''
      ''--x-manifest-root=.''
      ''--x-install-root=$TMP/vcpkg_installed''
    ];

    cmake-opts = lib.concatStringsSep " " [
      (lib.cmakeFeature "VCPKG_INSTALLED_DIR" "$TMP/vcpkg_installed")
      (lib.cmakeFeature "VCPKG_TRACE_FIND_PACKAGE" "ON")
      (lib.cmakeFeature "VCPKG_MANIFEST_INSTALL" "OFF")
      (lib.cmakeFeature "CMAKE_BUILD_TYPE" "Release")
      (lib.cmakeFeature "CMAKE_TOOLCHAIN_FILE" "${vcpkg}/share/vcpkg/scripts/buildsystems/vcpkg.cmake")
      # (lib.cmakeFeature "CMAKE_CXX_COMPILER" "g++")
      # (lib.cmakeFeature "CMAKE_C_COMPILER" "gcc")
      # -DVCPKG_INSTALL_OPTIONS="${vcpkg-install-opts}"
    ];
  in ''
    runHook preBuild

    vcpkg install ${vcpkg-install-opts}

    cmake ${cmake-opts} -S . -B build -G Ninja
    cmake --build ./build --config Release

    runHook postBuild
  '';

  # dontInstall = true;
  installPhase = ''
    runHook preInstall

    mkdir "$out"
    cmake --install ./build --prefix "$out"

    runHook postInstall
  '';

  passthru.deps = deps;
}