CI: Install LLVM

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get -y install cmake ninja-build qt5-default libclang-dev
+          sudo apt-get -y install cmake ninja-build qt5-default libclang-dev llvm-dev
 
       - name: Create build directory
         run: cmake -E make_directory ${{github.workspace}}/build
@@ -104,6 +104,7 @@ jobs:
     name: Build Windows (MSVC x86_64)
     runs-on: windows-2019
     env:
+      LLVM_VERSION: 11.0.1
       Qt_VERSION: 5.15.2
 
     steps:
@@ -125,6 +126,14 @@ jobs:
           version: ${{env.Qt_VERSION}}
           cached: ${{steps.cache-qt.outputs.cache-hit}}
 
+      - name: Install LLVM
+        run: |
+          $TempDir = "$env:RUNNER_WORKSPACE\temp"
+          $Filename = "LLVM-$env:LLVM_VERSION-win64.exe"
+          New-Item -Path "$TempDir" -ItemType Directory -ea 0
+          (New-Object Net.WebClient).DownloadFile("https://github.com/llvm/llvm-project/releases/download/llvmorg-$env:LLVM_VERSION/$Filename", "$TempDir\$Filename")
+          Start-Process "$TempDir\$Filename" -ArgumentList "/S" -Wait
+
       - name: Install dependencies
         run: choco install ninja