gh-actions: add loongarch64 clang-18 test

.github/workflows/ci.yml

@@ -609,6 +609,11 @@ jobs:
         #   arch_gnu: mips64el
         #   arch_gnu_abi: abi64
         #   distro: ubuntu-24.04
+        - version: 18
+          cross: loongarch64
+          arch_deb: loong64
+          arch_gnu: loongarch64
+          distro: ubuntu-24.04
     runs-on: ${{ matrix.distro }}
     steps:
     - uses: actions/checkout@v4
@@ -620,9 +625,10 @@ jobs:
     - name: Install APT Dependencies
       run: |
         sudo apt-get update -y
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/ppa && \
         sudo apt-get -yq install ninja-build parallel \
           binfmt-support clang-${{ matrix.version }} clang++-${{ matrix.version }} \
-          qemu-user-static pipx libc6-${{ matrix.arch_deb }}-cross libstdc++-12-dev-${{ matrix.arch_deb }}-cross \
+          qemu-user-static pipx libc6-${{ matrix.arch_deb }}-cross libstdc++-14-dev-${{ matrix.arch_deb }}-cross \
           binutils-${{ matrix.arch_gnu }}-linux-gnu${{ matrix.arch_gnu_abi }}
         pipx install meson==0.55.1
     - name: ccache

docker/cross-files/loongarch64-clang-18-ccache.cross

@@ -0,0 +1,20 @@
+[binaries]
+c = ['ccache', 'clang-18']
+cpp = ['ccache', 'clang++-18']
+ar = 'llvm-ar-18'
+strip = 'llvm-strip-18'
+objcopy = 'llvm-objcopy-18'
+ld = 'llvm-ld-18'
+exe_wrapper = ['qemu-loongarch64-static', '-L', '/usr/loongarch64-linux-gnu/', '-cpu', 'la464']
+
+[properties]
+c_args = ['--target=loongarch64-linux-gnu', '-march=la464', '-isystem=/usr/loongarch64-linux-gnu/include', '-Wextra', '-Werror']
+cpp_args = ['--target=loongarch64-linux-gnu', '-march=la464', '-isystem=/usr/loongarch64-linux-gnu/include', '-Wextra', '-Werror']
+c_link_args = ['--target=loongarch64-linux-gnu']
+cpp_link_args = ['--target=loongarch64-linux-gnu']
+
+[host_machine]
+system = 'linux'
+cpu_family = 'loongarch64'
+cpu = 'la464'
+endian = 'little'