Install llvm-19 on unix CI

.github/workflows/cmake.yml

@@ -58,11 +58,11 @@ jobs:
 
       - name: Build
         working-directory: asio
-        run: cmake --build build/coverage -j 2
+        run: cmake --build build/coverage -j 4
 
       - name: Test
         working-directory: asio/build/coverage
-        run: ctest --output-on-failure --no-tests=error -j 2
+        run: ctest --output-on-failure --no-tests=error -j 4
 
       - name: Process coverage info
         working-directory: asio
@@ -89,7 +89,7 @@ jobs:
 
       - name: Build
         working-directory: asio
-        run: cmake --build build/sanitize -j 2
+        run: cmake --build build/sanitize -j 4
 
       - name: Test
         working-directory: asio/build/sanitize
@@ -100,7 +100,7 @@ jobs:
             strict_init_order=1:\
             detect_leaks=1"
           UBSAN_OPTIONS: print_stacktrace=1
-        run: ctest --output-on-failure --no-tests=error -j 2
+        run: ctest --output-on-failure --no-tests=error -j 4
 
   test:
     needs: [lint]
@@ -116,35 +116,47 @@ jobs:
 
       - name: Install static analyzers
         if: matrix.os == 'ubuntu-24.04'
-        run: >-
-          sudo apt-get install clang-tidy-18 cppcheck -y -q
-
-          sudo update-alternatives --install
-          /usr/bin/clang-tidy clang-tidy
-          /usr/bin/clang-tidy-18 150
+        run: |
+          sudo apt-get install cppcheck ninja-build -y -q
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh 19 all
+          sudo update-alternatives --install \
+            /usr/bin/clang-tidy clang-tidy \
+            /usr/bin/clang-tidy-19 150
+
+      - name: Install llvm-19
+        if: startsWith(matrix.os, 'macos')
+        run: |
+          brew install llvm@19
 
       - name: Setup MultiToolTask
         if: matrix.os == 'windows-2022'
+        working-directory: asio
         run: |
           Add-Content "$env:GITHUB_ENV" 'UseMultiToolTask=true'
           Add-Content "$env:GITHUB_ENV" 'EnforceProcessCountAcrossBuilds=true'
+          cmake --preset=ci-windows
 
       - name: Configure
-        shell: pwsh
+        if: matrix.os != 'windows-2022'
         working-directory: asio
+        env:
+          CXX: clang++-19
+        shell: pwsh
         run: cmake "--preset=ci-$("${{ matrix.os }}".split("-")[0])"
 
       - name: Build
         working-directory: asio
-        run: cmake --build build --config Release -j 2
+        run: cmake --build build --config Release -j 4
 
       - name: Install
         working-directory: asio
         run: cmake --install build --config Release --prefix prefix
 
       - name: Test
         working-directory: asio/build
-        run: ctest --output-on-failure --no-tests=error -C Release -j 2
+        run: ctest --output-on-failure --no-tests=error -C Release -j 4
 
   docs:
     # Deploy docs only when builds succeed