mimicking Scipy:3

Author: mzecc

.github/workflows/build-wheels.yaml

@@ -88,6 +88,10 @@ jobs:
         if: ${{ matrix.os == 'windows-11-arm' }}
         shell: pwsh
         run: |
+          echo "CC=clang-cl"  | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          echo "CXX=clang-cl" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          echo "FC=flang-new" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+
           Invoke-WebRequest https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.8/LLVM-20.1.8-woa64.exe -OutFile LLVM-woa64.exe
           Start-Process -FilePath ".\LLVM-woa64.exe" -ArgumentList "/S" -Wait
           echo "C:\Program Files\LLVM\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
@@ -131,10 +135,6 @@ jobs:
           config-file: "{package}/pyproject.toml"
         env:
           CIBW_ARCHS: ${{ matrix.cibw_archs }}
-          CIBW_BEFORE_BUILD_WINDOWS: |
-            echo "CC=clang-cl" >> %GITHUB_ENV%
-            echo "CXX=clang-cl" >> %GITHUB_ENV%
-            echo "FC=flang-new" >> %GITHUB_ENV%
       - name: Upload wheels
         uses: actions/upload-artifact@v4
         with: