ci: Build linux-aarch64 toolchains and host tools natively

This commit updates the CI workflow to build the linux-aarch64
toolchains and host tools natively on the ARM64 zephyr-runner in order
to reduce build time and any complexities related to cross compilation.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

.github/workflows/ci.yml

@@ -223,7 +223,7 @@ jobs:
         if [ "${build_host_linux_aarch64}" == "y" ]; then
           MATRIX_HOSTS+='{
               "name": "linux-aarch64",
-              "runner": "zephyr-runner-linux-x64-4xlarge",
+              "runner": "zephyr-runner-linux-arm64-4xlarge",
               "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.2.3",
               "archive": "tar.xz"
             },'
@@ -416,12 +416,7 @@ jobs:
                                 pkg-config texinfo p7zip
 
         # Install dependencies for cross compilation
-        if [ "${{ matrix.host.name }}" == "linux-aarch64" ]; then
-          # Install aarch64-linux-gnu cross toolchain
-          sudo apt-get install -y binutils-aarch64-linux-gnu \
-                                  gcc-aarch64-linux-gnu \
-                                  g++-aarch64-linux-gnu
-        elif [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
+        if [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
           # Install MinGW-w64 cross toolchain
           sudo apt-get install -y binutils-mingw-w64 gcc-mingw-w64 \
                                   g++-mingw-w64
@@ -634,13 +629,7 @@ jobs:
         EOF
 
         # Set Canadian cross compilation configurations
-        if [ "${{ matrix.host.name }}" == "linux-aarch64" ]; then
-          # Building for linux-aarch64 on linux-x86_64
-          cat <<EOF >> .config
-        CT_CANADIAN=y
-        CT_HOST="aarch64-linux-gnu"
-        EOF
-        elif [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
+        if [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
           # Building for macos-aarch64 on macos-x86_64
           cat <<EOF >> .config
         CT_CANADIAN=y
@@ -660,18 +649,7 @@ jobs:
         CT_GDB_CROSS_PYTHON_VARIANT=y
         EOF
 
-        if [ "${{ matrix.host.name }}" == "linux-aarch64" ]; then
-          # Clone crosskit-aarch64-linux-libpython cross compilation kit
-          git clone \
-            https://github.com/stephanosio/crosskit-aarch64-linux-libpython.git \
-            ${WORKSPACE}/crosskit-aarch64-linux-libpython
-          # Use Python 3.8.0
-          export LIBPYTHON_KIT_ROOT=${WORKSPACE}/crosskit-aarch64-linux-libpython/python-3.8.0
-          # Set Python configuration resolver for GDB
-          cat <<EOF >> .config
-        CT_GDB_CROSS_PYTHON_BINARY="${LIBPYTHON_KIT_ROOT}/bin/python"
-        EOF
-        elif [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
+        if [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
           # Clone crosskit-aarch64-darwin-libpython cross compilation kit
           git clone \
             https://github.com/stephanosio/crosskit-aarch64-darwin-libpython.git \
@@ -720,10 +698,7 @@ jobs:
         popd
 
         # Resolve output directory path
-        if [ "${{ matrix.host.name }}" == "linux-aarch64" ]; then
-          OUTPUT_BASE="${WORKSPACE}/output"
-          OUTPUT_DIR="HOST-aarch64-linux-gnu"
-        elif [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
+        if [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
           OUTPUT_BASE="${WORKSPACE}/output"
           OUTPUT_DIR="HOST-aarch64-apple-darwin"
         elif [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
@@ -903,12 +878,6 @@ jobs:
         # Patch Poky sanity configuration to allow building as root
         sed -i '/^INHERIT/ s/./#&/' poky/meta/conf/sanity.conf
 
-        # Resolve host machine type
-        if [ "${{ matrix.host.name }}" == "linux-aarch64" ]; then
-          # Cross compiling for AArch64 host on x86-64
-          export MACHINE="aarch64"
-        fi
-
         # Build meta-zephyr-sdk
         ${POKY_BASE}/scripts/meta-zephyr-sdk-build.sh tools