Merge pull request #4250 from jon-turney/windows-clang-cl

Add support for clang-cl on Windows

1 files changed, 22 insertions, 1 deletions

diff --git a/ci/azure-steps.yml b/ci/azure-steps.yml
index 5c4a058..6303761 100644
--- a/ci/azure-steps.yml
+++ b/ci/azure-steps.yml
@@ -48,13 +48,34 @@ steps:
      # add downloads to PATH
      $env:Path = "$env:SYSTEM_WORKFOLDER;$env:Path"
 
+     $origPath = $env:Path
      # import visual studio variables
+     if ($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)
 
+     if ($env:compiler -eq 'clang-cl') {
+       # drop visual studio from PATH
+       # (but leave INCLUDE, LIB and WindowsSdkDir environment variables set)
+       $env:Path = $origPath
+
+       # install llvm for clang-cl builds
+       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"
+
+       # and use Windows SDK tools
+       $env:Path = "$env:WindowsSdkDir\bin\$env:Arch;$env:Path"
+     }
+
      # 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) {