azure: Add clang-cl/ninja to matrix

Note that Vs2017 tools are also in PATH for llvm build

azure-pipelines.yml

@@ -44,6 +44,10 @@ jobs:
           arch: x64
           compiler: msvc2017
           backend: vs2017
+        clangclx64ninja:
+          arch: x64
+          compiler: clang-cl
+          backend: ninja
 
   steps:
   - template: ci/azure-steps.yml

ci/azure-steps.yml

@@ -49,12 +49,26 @@ steps:
      $env:Path = "$env:SYSTEM_WORKFOLDER;$env:Path"
 
      # import visual studio variables
+     if ($env:compiler -eq 'msvc2015') {
+       $vsver = $env:compiler.Replace('msvc', '')
+     } else {
+       $vsver = '2017'
+     }
      Set-PSRepository -Name PSGallery -InstallationPolicy Trusted
      Install-Module Pscx -Scope CurrentUser -AllowClobber
      Install-Module VSSetup -Scope CurrentUser
-     $vsver = $env:compiler.Replace('msvc', '')
      Import-VisualStudioVars -VisualStudioVersion $vsver -Architecture $(arch)
 
+     # install llvm for clang-cl builds
+     # (note that we use LIB, WINDRES from VS, so leave those in PATH)
+     if ($env:compiler -eq 'clang-cl') {
+       DownloadFile -Source 'http://releases.llvm.org/7.0.0/LLVM-7.0.0-win64.exe' -Destination LLVM-7.0.0-win64.exe
+       Start-Process .\LLVM-7.0.0-win64.exe -ArgumentList '/S' -Wait
+       $env:Path = "C:\Program Files\LLVM\bin;$env:Path"
+       $env:CC = "clang-cl"
+       $env:CXX = "clang-cl"
+     }
+
      # add .NET framework tools to path for resgen for C# tests
      # (always use 32-bit tool, as there doesn't seem to be a 64-bit tool)
      if ((Get-Command "resgen.exe" -ErrorAction SilentlyContinue) -eq $null) {