ci: antora workflow sets up clang 18

.github/workflows/ci.yml

@@ -353,7 +353,13 @@ jobs:
     name: Antora Docs
     needs: [ runner-selection ]
     runs-on: ${{ fromJSON(needs.runner-selection.outputs.labelmatrix)['ubuntu-latest'] }}
+    container: ubuntu:23.10
     steps:
+      - name: Install packages
+        uses: alandefreitas/cpp-actions/[email protected]
+        with:
+          apt-get: git cmake
+
       - name: Clone Boost.URL
         uses: actions/checkout@v4
 
@@ -366,7 +372,18 @@ jobs:
         id: setup-cpp
         with:
           compiler: clang
-          version: 17
+          version: 18
+
+      - name: Set environment variables
+        run: |
+          set -x
+          clangpp_path="$(which clang++-18)"
+          clang_path="$(which clang-18)"
+          echo "CXX_COMPILER=$clangpp_path" >> $GITHUB_ENV
+          echo "CXX=$clang_path" >> $GITHUB_ENV
+          echo "C_COMPILER=$clang_path" >> $GITHUB_ENV
+          echo "CC=$clang_path" >> $GITHUB_ENV
+          git config --global --add safe.directory "$(pwd)"
 
       - name: Build Antora Docs
         run: |

doc/generate-files.mjs

@@ -100,12 +100,20 @@ if (cxxCompiler && process.platform === "win32") {
     // Replace "\" with "/" in CXX_COMPILER
     cxxCompiler = cxxCompiler.replace(/\\/g, '/')
 }
+if (cxxCompiler === undefined) {
+    console.error('Could not find a C++ compiler. Please set the CXX_COMPILER environment variable.')
+    process.exit(1)
+}
 const cxxCompilerName = path.basename(cxxCompiler).replace(/\.exe$/, '')
 let cCompiler = findExecutable(['clang', 'gcc', 'cl']) || process.env.C_COMPILER || process.env.CC
 if (cCompiler && process.platform === "win32") {
     // Replace "\" with "/" in CXX_COMPILER
     cCompiler = cCompiler.replace(/\\/g, '/')
 }
+if (cCompiler === undefined) {
+    console.error('Could not find a C compiler. Please set the C_COMPILER environment variable.')
+    process.exit(1)
+}
 const cCompilerName = path.basename(cCompiler).replace(/\.exe$/, '')
 
 console.log(`C++ compiler: ${cxxCompilerName} (${cxxCompiler})`)