Fix Windows AdaptiveCpp CPU compiler path

Author: allnes

.github/actions/setup-sycl-toolchain/action.yml

@@ -99,6 +99,15 @@ runs:
     if: ${{ runner.os == 'Windows' }}
     shell: pwsh
     run: |
+      function Get-ShortPath($Path) {
+        $resolvedPath = (Resolve-Path $Path).Path
+        $shortPath = & $env:ComSpec /d /c "for %I in (`"$resolvedPath`") do @echo %~sI"
+        if ($LASTEXITCODE -ne 0 -or [string]::IsNullOrWhiteSpace($shortPath)) {
+          throw "Failed to resolve short path for $resolvedPath"
+        }
+        return $shortPath.Trim()
+      }
+
       $clangCl = Get-Command clang-cl.exe -ErrorAction SilentlyContinue
       if (-not $clangCl -and $env:ProgramFiles) {
         $programFilesClang = Join-Path $env:ProgramFiles 'LLVM/bin/clang-cl.exe'
@@ -126,10 +135,11 @@ runs:
       if (-not (Test-Path $clangCxxPath)) {
         throw "clang++.exe was not found next to $clangClPath. Install the Visual Studio LLVM/Clang toolset on the Windows runner."
       }
+      $clangCxxShortPath = Get-ShortPath $clangCxxPath
 
       "ITLABAI_CC=$clangClPath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
       "ITLABAI_CXX=$clangClPath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
-      "ITLABAI_ACPP_CPU_CXX=$clangCxxPath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+      "ITLABAI_ACPP_CPU_CXX=$clangCxxShortPath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
       "$clangBin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
 
   - name: Configure Windows toolchain environment