[ci] Add some older compilers

Author: K-ballo

.github/workflows/test.yml

@@ -25,6 +25,11 @@ jobs:
             compiler: gcc-16
             preset: dev-gcc
 
+          # ── Linux / GCC 14 ──
+          - os: ubuntu-24.04
+            compiler: gcc-14
+            preset: dev-gcc
+
           # ── Linux / Clang 22 ──
           - os: ubuntu-24.04
             compiler: clang-22
@@ -35,21 +40,41 @@ jobs:
             compiler: clang-22+libc++
             preset: dev-clang-libcxx
 
+          # ── Linux / Clang 18 ──
+          - os: ubuntu-24.04
+            compiler: clang-18
+            preset: dev-clang
+
           # ── macOS 26 / AppleClang 21 ──
           - os: macos-26
             compiler: apple-clang-21
             preset: dev-clang
 
+          # ── macOS 15 / AppleClang 16 ──
+          - os: macos-15
+            compiler: apple-clang-16
+            preset: dev-clang
+
           # ── Windows 2025 / MSVC 2026 ──
           - os: windows-2025
             compiler: msvc-2026
             preset: dev-msvc
 
+          # ── Windows 2022 / MSVC 2022 ──
+          - os: windows-2022
+            compiler: msvc-2022
+            preset: dev-msvc
+
+          # ── Windows 2025 / Clang-CL ──
+          - os: windows-2025
+            compiler: clang-cl
+            preset: dev-clang-cl
+
     steps:
       - uses: actions/checkout@v5
 
       - name: Set up MSVC environment
-        if: matrix.compiler == 'msvc-2026'
+        if: startsWith(matrix.compiler, 'msvc') || matrix.compiler == 'clang-cl'
         shell: pwsh
         run: |
           $vsPath = & "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" `
@@ -70,6 +95,12 @@ jobs:
           sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-16 100 \
                                    --slave /usr/bin/g++ g++ /usr/bin/g++-16
 
+      - name: Install Clang 18
+        if: matrix.compiler == 'clang-18'
+        run: |
+          sudo update-alternatives --install /usr/bin/clang   clang   /usr/bin/clang-18   200
+          sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-18 200
+
       - name: Install Clang 22 + libc++
         if: startsWith(matrix.compiler, 'clang-22')
         run: |

CMakePresets.json

@@ -76,6 +76,19 @@
         "CXXFLAGS": "/d1trimfile:\"${sourceDir}\""
       }
     },
+    {
+      "name": "dev-clang-cl",
+      "displayName": "Clang-CL x64",
+      "inherits": "base",
+      "cacheVariables": {
+        "CMAKE_C_COMPILER": "clang-cl",
+        "CMAKE_CXX_COMPILER": "clang-cl"
+      },
+      "environment": {
+        "CFLAGS": "/clang:-ffile-prefix-map=${sourceDir}=.",
+        "CXXFLAGS": "/clang:-ffile-prefix-map=${sourceDir}=."
+      }
+    },
     {
       "name": "asan",
       "displayName": "ASan + UBSan / Clang",