Cross compiling improvements + macOS universal binary (#1458)

* chore(resources): rename macos_arm64.txt to macos-arm64.txt
   This matches the platform-arch convention like many other parts of the project.
* chore(resources/cross): rename wasm.txt to unknown-wasm32.txt
* refactor(scripts/common.sh): use parameter expansion instead of if else
* feat(scripts/common.sh): support custom arch and platform for get_default_build_dir
* feat(scripts/build.sh): add --cross-platform, --cross-arch and --cross-file
* feat(scripts/package.sh): add --cross-platform and --cross-arch
* feat(build-packages.sh): add support for new options in build.sh and packages.sh
* ci(build): make arm64 binaries in CI
* ci(build): do not install external libraries
* ci(build): fix invalid artifact name
* ci(build): fix INSTALL_NAME
* ci(build): change name for macos artifacts
* ci(build): add script to build universal dmgs from individual dmgs
* ci(build): build universal dmgs
* fix(make-universal-binaries): fix wrong path for hdiutil
* ci(build): rename macos action
* fix(make-universal-binaries.sh): fix wrong pathname for ditto
* ci(release): build macos universal binaries
* ci(release): remove useless variables
* ci(release): fix wrong dependency
* ci(build): fix old ubuntu version
   This version will be restored once I complete some container-specific fixes.
* ci(build): make build_macos_universal depend on release
* ci(build): fix wrong dmg dir
* style(ci): capitalize 'universal' for CI name
* fix(make-universal-binaries.sh): fix truncated dmg name when it contains dots
* ci: styling changes
* ci(release): install appdmg only

.github/workflows/build.yml

@@ -54,11 +54,14 @@ jobs:
           path: ${{ env.INSTALL_NAME }}.tar.gz
 
   build_macos:
-    name: macOS (x86_64)
+    name: macOS
     runs-on: macos-11
     env:
       CC: clang
       CXX: clang++
+    strategy:
+      matrix:
+        arch: ['x86_64', 'arm64']
     steps:
       - name: System Information
         run: |
@@ -70,24 +73,60 @@ jobs:
         run: |
           echo "$HOME/.local/bin" >> "$GITHUB_PATH"
           echo "INSTALL_REF=${GITHUB_REF##*/}" >> "$GITHUB_ENV"
-          echo "INSTALL_NAME=lite-xl-${GITHUB_REF##*/}-macos-$(uname -m)" >> "$GITHUB_ENV"
+          echo "INSTALL_NAME=lite-xl-${GITHUB_REF##*/}-macos-${{ matrix.arch }}" >> "$GITHUB_ENV"
+          if [[ $(uname -m) != ${{ matrix.arch }} ]]; then echo "ARCH=--cross-arch ${{ matrix.arch }}" >> "$GITHUB_ENV"; fi
       - uses: actions/checkout@v3
       - name: Python Setup
         uses: actions/setup-python@v4
         with:
           python-version: 3.9
       - name: Install Dependencies
-        run: bash scripts/install-dependencies.sh --debug
+             # --lhelper will eliminate a warning with arm64 and libusb
+        run: bash scripts/install-dependencies.sh --debug --lhelper
       - name: Build
         run: |
           bash --version
-          bash scripts/build.sh --bundle --debug --forcefallback
+          bash scripts/build.sh --bundle --debug --forcefallback $ARCH
       - name: Create DMG Image
-        run: bash scripts/package.sh --version ${INSTALL_REF} --debug --dmg
+        run: bash scripts/package.sh --version ${INSTALL_REF} $ARCH --debug --dmg
       - name: Upload DMG Image
         uses: actions/upload-artifact@v3
         with:
-          name: macOS DMG Image
+          name: macOS DMG Images
+          path: ${{ env.INSTALL_NAME }}.dmg
+
+  build_macos_universal:
+    name: macOS (Universal)
+    runs-on: macos-11
+    needs: build_macos
+    steps:
+      - name: System Information
+        run: |
+          system_profiler SPSoftwareDataType
+          bash --version
+          gcc -v
+          xcodebuild -version
+      - name: Set Environment Variables
+        run: |
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+          echo "INSTALL_NAME=lite-xl-${GITHUB_REF##*/}-macos-universal" >> "$GITHUB_ENV"
+      - uses: actions/checkout@v2
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        id: download
+        with:
+          name: macOS DMG Images
+          path: dmgs-original
+      - name: Install appdmg
+        run: cd ~; npm i appdmg; cd -
+      - name: Make universal bundles
+        run: |
+          bash --version
+          bash scripts/make-universal-binaries.sh ${{ steps.download.outputs.download-path }} "${INSTALL_NAME}"
+      - name: Upload DMG Image
+        uses: actions/upload-artifact@v2
+        with:
+          name: macOS Universal DMG Images
           path: ${{ env.INSTALL_NAME }}.dmg
 
   build_windows_msys2:

.github/workflows/release.yml

@@ -15,7 +15,7 @@ on:
 jobs:
   release:
     name: Create Release
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     outputs:
       upload_url: ${{ steps.create_release.outputs.upload_url }}
       version: ${{ steps.tag.outputs.version }}
@@ -49,7 +49,7 @@ jobs:
   build_linux:
     name: Linux
     needs: release
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     env:
       CC: gcc
       CXX: g++
@@ -115,6 +115,7 @@ jobs:
           echo "INSTALL_REF=${{ needs.release.outputs.version }}" >> "$GITHUB_ENV"
           echo "INSTALL_NAME=lite-xl-${{ needs.release.outputs.version }}-macos-${{ matrix.arch }}" >> "$GITHUB_ENV"
           echo "INSTALL_NAME_ADDONS=lite-xl-${{ needs.release.outputs.version }}-addons-macos-${{ matrix.arch }}" >> "$GITHUB_ENV"
+          if [[ $(uname -m) != ${{ matrix.arch }} ]]; then echo "ARCH=--cross-arch ${{ matrix.arch }}" >> "$GITHUB_ENV"; fi
       - uses: actions/checkout@v3
       - name: Python Setup
         uses: actions/setup-python@v4
@@ -125,11 +126,18 @@ jobs:
       - name: Build
         run: |
           bash --version
-          CROSS_ARCH=${{ matrix.arch }} bash scripts/build.sh --bundle --debug --forcefallback --release
+          bash scripts/build.sh --bundle --debug --forcefallback --release $ARCH
       - name: Create DMG Image
         run: |
-          CROSS_ARCH=${{ matrix.arch }} bash scripts/package.sh --version ${INSTALL_REF} --debug --dmg --release
-          CROSS_ARCH=${{ matrix.arch }} bash scripts/package.sh --version ${INSTALL_REF} --debug --addons --dmg --release
+          bash scripts/package.sh --version ${INSTALL_REF} $ARCH --debug --dmg --release
+          bash scripts/package.sh --version ${INSTALL_REF} $ARCH --debug --addons --dmg --release
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: macOS DMG Images
+          path: |
+            ${{ env.INSTALL_NAME }}.dmg
+            ${{ env.INSTALL_NAME_ADDONS }}.dmg
       - name: Upload Files
         uses: softprops/action-gh-release@v1
         with:
@@ -139,6 +147,54 @@ jobs:
             ${{ env.INSTALL_NAME }}.dmg
             ${{ env.INSTALL_NAME_ADDONS }}.dmg
 
+  build_macos_universal:
+    name: macOS (Universal)
+    needs: [release, build_macos]
+    runs-on: macos-11
+    steps:
+      - name: System Information
+        run: |
+          system_profiler SPSoftwareDataType
+          bash --version
+          gcc -v
+          xcodebuild -version
+      - name: Set Environment Variables
+        run: |
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+          echo "INSTALL_BASE=lite-xl-${{ needs.release.outputs.version }}-macos" >> "$GITHUB_ENV"
+          echo "INSTALL_BASE_ADDONS=lite-xl-${{ needs.release.outputs.version }}-addons-macos" >> "$GITHUB_ENV"
+      - uses: actions/checkout@v2
+      - name: Download Artifacts
+        uses: actions/download-artifact@v3
+        id: download
+        with:
+          name: macOS DMG Images
+          path: dmgs-original
+      - name: Python Setup
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install appdmg
+        run: cd ~; npm i appdmg; cd -
+      - name: Prepare DMG Images
+        run: |
+          mkdir -p dmgs-addons dmgs-normal
+          mv -v "${{ steps.download.outputs.download-path }}/$INSTALL_BASE-"{x86_64,arm64}.dmg dmgs-normal
+          mv -v "${{ steps.download.outputs.download-path }}/$INSTALL_BASE_ADDONS-"{x86_64,arm64}.dmg dmgs-addons
+      - name: Create Universal DMGs
+        run: |
+          bash --version
+          bash scripts/make-universal-binaries.sh dmgs-normal "$INSTALL_BASE-universal"
+          bash scripts/make-universal-binaries.sh dmgs-addons "$INSTALL_BASE_ADDONS-universal"
+      - name: Upload Files
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ needs.release.outputs.version }}
+          draft: true
+          files: |
+            ${{ env.INSTALL_BASE }}-universal.dmg
+            ${{ env.INSTALL_BASE_ADDONS }}-universal.dmg
+
   build_windows_msys2:
     name: Windows
     needs: release

build-packages.sh

@@ -13,33 +13,36 @@ show_help() {
   echo
   echo "Common options:"
   echo
-  echo "-h --help                 Show this help and exit."
-  echo "-b --builddir DIRNAME     Set the name of the build directory (not path)."
-  echo "                          Default: '$(get_default_build_dir)'."
-  echo "-p --prefix PREFIX        Install directory prefix."
-  echo "                          Default: '/'."
-  echo "   --debug                Debug this script."
+  echo "-h --help                     Show this help and exit."
+  echo "-b --builddir DIRNAME         Set the name of the build directory (not path)."
+  echo "                              Default: '$(get_default_build_dir)'."
+  echo "-p --prefix PREFIX            Install directory prefix."
+  echo "                              Default: '/'."
+  echo "   --cross-platform PLATFORM  The platform to cross compile for."
+  echo "   --cross-arch ARCH          The architecture to cross compile for."
+  echo "   --debug                    Debug this script."
   echo
   echo "Build options:"
   echo
-  echo "-f --forcefallback        Force to build subprojects dependencies statically."
-  echo "-B --bundle               Create an App bundle (macOS only)"
-  echo "-P --portable             Create a portable package."
-  echo "-O --pgo                  Use profile guided optimizations (pgo)."
-  echo "                          Requires running the application iteractively."
+  echo "-f --forcefallback            Force to build subprojects dependencies statically."
+  echo "-B --bundle                   Create an App bundle (macOS only)"
+  echo "-P --portable                 Create a portable package."
+  echo "-O --pgo                      Use profile guided optimizations (pgo)."
+  echo "                              Requires running the application iteractively."
+  echo "   --cross-file CROSS_FILE    The cross file used for compiling."
   echo
   echo "Package options:"
   echo
-  echo "-d --destdir DIRNAME      Set the name of the package directory (not path)."
-  echo "                          Default: 'lite-xl'."
-  echo "-v --version VERSION      Sets the version on the package name."
-  echo "-A --appimage             Create an AppImage (Linux only)."
-  echo "-D --dmg                  Create a DMG disk image (macOS only)."
-  echo "                          Requires NPM and AppDMG."
-  echo "-I --innosetup            Create an InnoSetup installer (Windows only)."
-  echo "-r --release              Compile in release mode."
-  echo "-S --source               Create a source code package,"
-  echo "                          including subprojects dependencies."
+  echo "-d --destdir DIRNAME          Set the name of the package directory (not path)."
+  echo "                              Default: 'lite-xl'."
+  echo "-v --version VERSION          Sets the version on the package name."
+  echo "-A --appimage                 Create an AppImage (Linux only)."
+  echo "-D --dmg                      Create a DMG disk image (macOS only)."
+  echo "                              Requires NPM and AppDMG."
+  echo "-I --innosetup                Create an InnoSetup installer (Windows only)."
+  echo "-r --release                  Compile in release mode."
+  echo "-S --source                   Create a source code package,"
+  echo "                              including subprojects dependencies."
   echo
 }
 
@@ -60,6 +63,12 @@ main() {
   local portable
   local pgo
   local release
+  local cross_platform
+  local cross_platform_option=()
+  local cross_arch
+  local cross_arch_option=()
+  local cross_file
+  local cross_file_option=()
 
   for i in "$@"; do
     case $i in
@@ -123,6 +132,21 @@ main() {
         pgo="--pgo"
         shift
         ;;
+      --cross-platform)
+        cross_platform="$2"
+        shift
+        shift
+        ;;
+      --cross-arch)
+        cross_arch="$2"
+        shift
+        shift
+        ;;
+      --cross-file)
+        cross_file="$2"
+        shift
+        shift
+        ;;
       --debug)
         debug="--debug"
         set -x
@@ -143,10 +167,18 @@ main() {
   if [[ -n $dest_dir ]]; then dest_dir_option=("--destdir" "${dest_dir}"); fi
   if [[ -n $prefix ]]; then prefix_option=("--prefix" "${prefix}"); fi
   if [[ -n $version ]]; then version_option=("--version" "${version}"); fi
+  if [[ -n $cross_platform ]]; then cross_platform_option=("--cross-platform" "${cross_platform}"); fi
+  if [[ -n $cross_arch ]]; then cross_arch_option=("--cross-arch" "${cross_arch}"); fi
+  if [[ -n $cross_file ]]; then cross_file_option=("--cross-file" "${cross_file}"); fi
+
+
 
   source scripts/build.sh \
     ${build_dir_option[@]} \
     ${prefix_option[@]} \
+    ${cross_platform_option[@]} \
+    ${cross_arch_option[@]} \
+    ${cross_file_option[@]} \
     $debug \
     $force_fallback \
     $bundle \
@@ -159,6 +191,8 @@ main() {
     ${dest_dir_option[@]} \
     ${prefix_option[@]} \
     ${version_option[@]} \
+    ${cross_platform_option[@]} \
+    ${cross_arch_option[@]} \
     --binary \
     --addons \
     $debug \

scripts/build.sh

@@ -13,19 +13,26 @@ show_help() {
   echo
   echo "Available options:"
   echo
-  echo "-b --builddir DIRNAME     Sets the name of the build directory (not path)."
-  echo "                          Default: '$(get_default_build_dir)'."
-  echo "   --debug                Debug this script."
-  echo "-f --forcefallback        Force to build dependencies statically."
-  echo "-h --help                 Show this help and exit."
-  echo "-p --prefix PREFIX        Install directory prefix. Default: '/'."
-  echo "-B --bundle               Create an App bundle (macOS only)"
-  echo "-P --portable             Create a portable binary package."
-  echo "-O --pgo                  Use profile guided optimizations (pgo)."
-  echo "-U --windows-lua-utf      Use the UTF8 patch for Lua."
-  echo "                          macOS: disabled when used with --bundle,"
-  echo "                          Windows: Implicit being the only option."
-  echo "-r --release              Compile in release mode."
+  echo "-b --builddir DIRNAME         Sets the name of the build directory (not path)."
+  echo "                              Default: '$(get_default_build_dir)'."
+  echo "   --debug                    Debug this script."
+  echo "-f --forcefallback            Force to build dependencies statically."
+  echo "-h --help                     Show this help and exit."
+  echo "-p --prefix PREFIX            Install directory prefix. Default: '/'."
+  echo "-B --bundle                   Create an App bundle (macOS only)"
+  echo "-P --portable                 Create a portable binary package."
+  echo "-O --pgo                      Use profile guided optimizations (pgo)."
+  echo "-U --windows-lua-utf          Use the UTF8 patch for Lua."
+  echo "                              macOS: disabled when used with --bundle,"
+  echo "                              Windows: Implicit being the only option."
+  echo "-r --release                  Compile in release mode."
+  echo "   --cross-platform PLATFORM  Cross compile for this platform."
+  echo "                              The script will find the appropriate"
+  echo "                              cross file in 'resources/cross'."
+  echo "   --cross-arch ARCH          Cross compile for this architecture."
+  echo "                              The script will find the appropriate"
+  echo "                              cross file in 'resources/cross'."
+  echo "   --cross-file CROSS_FILE    Cross compile with the given cross file."
   echo
 }
 
@@ -40,6 +47,10 @@ main() {
   local portable
   local pgo
   local patch_lua
+  local cross
+  local cross_platform
+  local cross_arch
+  local cross_file
 
   local lua_subproject_path
 
@@ -87,6 +98,24 @@ main() {
         patch_lua="true"
         shift
         ;;
+      --cross-arch)
+        cross="true"
+        cross_arch="$2"
+        shift
+        shift
+        ;;
+      --cross-platform)
+        cross="true"
+        cross_platform="$2"
+        shift
+        shift
+        ;;
+      --cross-file)
+        cross="true"
+        cross_file="$2"
+        shift
+        shift
+        ;;
       -r|--release)
         build_type="release"
         shift
@@ -107,19 +136,43 @@ main() {
       portable=""
   fi
 
-  if [[ $CROSS_ARCH != "" ]]; then
-    if [[ $platform == "macos" ]]; then
-      macos_version_min=10.11
-      if [[ $CROSS_ARCH == "arm64" ]]; then
-        cross_file="--cross-file resources/cross/macos_arm64.txt"
-        macos_version_min=11.0
+  # if CROSS_ARCH is used, it will be picked up
+  cross="${cross:-$CROSS_ARCH}"
+  if [[ -n "$cross" ]]; then
+    if [[ -n "$cross_file" ]] && ([[ -z "$cross_arch" ]] || [[ -z "$cross_platform" ]]); then
+      echo "Warning: --cross-platform or --cross-platform not set; guessing it from the filename."
+      # remove file extensions and directories from the path
+      cross_file_name="${cross_file##*/}"
+      cross_file_name="${cross_file_name%%.*}"
+      # cross_platform is the string before encountering the first hyphen
+      if [[ -z "$cross_platform" ]]; then
+        cross_platform="${cross_file_name%%-*}"
+        echo "Warning: Guessing --cross-platform $cross_platform"
+      fi
+      # cross_arch is the string after encountering the first hyphen
+      if [[ -z "$cross_arch" ]]; then
+        cross_arch="${cross_file_name#*-}"
+        echo "Warning: Guessing --cross-arch $cross_arch"
       fi
-      export MACOSX_DEPLOYMENT_TARGET=$macos_version_min
-      export MIN_SUPPORTED_MACOSX_DEPLOYMENT_TARGET=$macos_version_min
-      export CFLAGS=-mmacosx-version-min=$macos_version_min
-      export CXXFLAGS=-mmacosx-version-min=$macos_version_min
-      export LDFLAGS=-mmacosx-version-min=$macos_version_min
     fi
+    platform="${cross_platform:-$platform}"
+    arch="${cross_arch:-$arch}"
+    cross_file=("--cross-file" "${cross_file:-resources/cross/$platform-$arch.txt}")
+    # reload build_dir because platform and arch might change
+    build_dir="$(get_default_build_dir "$platform" "$arch")"
+  fi
+
+  # arch and platform specific stuff
+  if [[ "$platform" == "macos" ]]; then
+    macos_version_min="10.11"
+    if [[ "$arch" == "arm64" ]]; then
+      macos_version_min="11.0"
+    fi
+    export MACOSX_DEPLOYMENT_TARGET="$macos_version_min"
+    export MIN_SUPPORTED_MACOSX_DEPLOYMENT_TARGET="$macos_version_min"
+    export CFLAGS="-mmacosx-version-min=$macos_version_min"
+    export CXXFLAGS="-mmacosx-version-min=$macos_version_min"
+    export LDFLAGS="-mmacosx-version-min=$macos_version_min"
   fi
 
   rm -rf "${build_dir}"
@@ -137,7 +190,7 @@ main() {
   CFLAGS=$CFLAGS LDFLAGS=$LDFLAGS meson setup \
     --buildtype=$build_type \
     --prefix "$prefix" \
-    $cross_file \
+    "${cross_file[@]}" \
     $force_fallback \
     $bundle \
     $portable \

scripts/common.sh

@@ -75,22 +75,20 @@ get_platform_name() {
 
 get_platform_arch() {
   platform=$(get_platform_name)
-  arch=$(uname -m)
+  arch=${CROSS_ARCH:-$(uname -m)}
   if [[ $MSYSTEM != "" ]]; then
     if [[ $MSYSTEM == "MINGW64" ]]; then
       arch=x86_64
     else
       arch=i686
     fi
-  elif [[ $CROSS_ARCH != "" ]]; then
-    arch=$CROSS_ARCH
   fi
   echo "$arch"
 }
 
 get_default_build_dir() {
-  platform=$(get_platform_name)
-  arch=$(get_platform_arch)
+  platform="${1:-$(get_platform_name)}"
+  arch="${2:-$(get_platform_arch)}"
   echo "build-$platform-$arch"
 }
 

scripts/make-universal-binaries.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -ex
+
+if [ ! -e "src/api/api.h" ]; then
+  echo "Please run this script from the root directory of Lite XL."
+  exit 1
+fi
+
+WORKDIR="work"
+DMGDIR="$1"
+
+if [[ -z "$DMGDIR" ]]; then
+	echo "Please provide a path containing the dmg files."
+	exit 1
+fi
+
+rm -rf "$WORKDIR"
+mkdir -p "$WORKDIR"
+
+for dmg_path in "$DMGDIR"/*.dmg; do
+	dmg="${dmg_path##*/}"
+	dmg="${dmg%.dmg}"
+	hdiutil attach -mountpoint "/Volumes/$dmg" "$dmg_path"
+	if [[ ! -d "$WORKDIR/dmg" ]]; then
+		ditto "/Volumes/$dmg/Lite XL.app" "Lite XL.app"
+	fi
+	cp "/Volumes/$dmg/Lite XL.app/Contents/MacOS/lite-xl" "$WORKDIR/$dmg-lite-xl"
+	hdiutil detach "/Volumes/$dmg"
+done
+
+lipo -create -output "Lite XL.app/Contents/MacOS/lite-xl" "$WORKDIR/"*-lite-xl
+
+source scripts/appdmg.sh "$2"

scripts/package.sh

@@ -13,23 +13,25 @@ show_help() {
   echo
   echo "Available options:"
   echo
-  echo "-b --builddir DIRNAME     Sets the name of the build directory (not path)."
-  echo "                          Default: '$(get_default_build_dir)'."
-  echo "-d --destdir DIRNAME      Set the name of the package directory (not path)."
-  echo "                          Default: 'lite-xl'."
-  echo "-h --help                 Show this help and exit."
-  echo "-p --prefix PREFIX        Install directory prefix. Default: '/'."
-  echo "-v --version VERSION      Sets the version on the package name."
-  echo "-a --addons               Install 3rd party addons."
-  echo "   --debug                Debug this script."
-  echo "-A --appimage             Create an AppImage (Linux only)."
-  echo "-B --binary               Create a normal / portable package or macOS bundle,"
-  echo "                          depending on how the build was configured. (Default.)"
-  echo "-D --dmg                  Create a DMG disk image with AppDMG (macOS only)."
-  echo "-I --innosetup            Create a InnoSetup package (Windows only)."
-  echo "-r --release              Strip debugging symbols."
-  echo "-S --source               Create a source code package,"
-  echo "                          including subprojects dependencies."
+  echo "-b --builddir DIRNAME         Sets the name of the build directory (not path)."
+  echo "                              Default: '$(get_default_build_dir)'."
+  echo "-d --destdir DIRNAME          Set the name of the package directory (not path)."
+  echo "                              Default: 'lite-xl'."
+  echo "-h --help                     Show this help and exit."
+  echo "-p --prefix PREFIX            Install directory prefix. Default: '/'."
+  echo "-v --version VERSION          Sets the version on the package name."
+  echo "-a --addons                   Install 3rd party addons."
+  echo "   --debug                    Debug this script."
+  echo "-A --appimage                 Create an AppImage (Linux only)."
+  echo "-B --binary                   Create a normal / portable package or macOS bundle,"
+  echo "                              depending on how the build was configured. (Default.)"
+  echo "-D --dmg                      Create a DMG disk image with AppDMG (macOS only)."
+  echo "-I --innosetup                Create a InnoSetup package (Windows only)."
+  echo "-r --release                  Strip debugging symbols."
+  echo "-S --source                   Create a source code package,"
+  echo "                              including subprojects dependencies."
+  echo "   --cross-platform PLATFORM  The platform to package for."
+  echo "   --cross-arch ARCH          The architecture to package for."
   echo
 }
 
@@ -73,6 +75,9 @@ main() {
   local innosetup=false
   local release=false
   local source=false
+  local cross
+  local cross_arch
+  local cross_platform
 
   # store the current flags to easily pass them to appimage script
   local flags="$@"
@@ -143,6 +148,18 @@ main() {
         addons=true
         shift
         ;;
+      --cross-platform)
+        cross=true
+        cross_platform="$2"
+        shift
+        shift
+        ;;
+      --cross-arch)
+        cross=true
+        cross_arch="$2"
+        shift
+        shift
+        ;;
       --debug)
         set -x
         shift
@@ -159,6 +176,12 @@ main() {
 
   if [[ -n $1 ]]; then show_help; exit 1; fi
 
+  if [[ -n "$cross" ]]; then
+    platform="${cross_platform:-$platform}"
+    arch="${cross_arch:-$arch}"
+    build_dir="$(get_default_build_dir "$platform" "$arch")"
+  fi
+
   # The source package doesn't require a previous build,
   # nor the following install step, so run it now.
   if [[ $source == true ]]; then source_package "lite-xl$version-src"; fi