pixi: cxx-compiler overwrite CC and CXX, so we must setup them in activation

Author: jorisv

.github/workflows/macos-linux-windows-conda.yml

@@ -50,10 +50,12 @@ jobs:
         include:
           - os: windows-latest
             environment: all
-            compiler: cl
+            cxx_options: ''
+            build_type: Release
           - os: windows-latest
-            environment: all
-            compiler: clang-cl
+            environment: all-clang-cl
+            cxx_options: ''
+            build_type: Release
 
     steps:
     - uses: actions/checkout@v4
@@ -72,24 +74,14 @@ jobs:
         cache: true
         environments: ${{ matrix.environment }}
 
-    - name: Build EigenPy [MacOS/Linux]
-      if: contains(matrix.os, 'ubuntu') || contains(matrix.os, 'macos')
+    - name: Build EigenPy [MacOS/Linux/Windows]
       env:
         CMAKE_BUILD_PARALLEL_LEVEL: 4
         EIGENPY_BUILD_TYPE: ${{ matrix.build_type }}
         EIGENPY_CXX_FLAGS: ${{ matrix.cxx_options }}
       run: |
         pixi run -e ${{ matrix.environment }} test
 
-    - name: Build EigenPy [Windows]
-      if: contains(matrix.os, 'windows')
-      env:
-        CMAKE_BUILD_PARALLEL_LEVEL: 4
-        CC: ${{ matrix.compiler }}
-        CXX: ${{ matrix.compiler }}
-      run: |
-        pixi run -e ${{ matrix.environment }} test
-
   check:
     if: always()
     name: check-macos-linux-windows-pixi

pixi.lock

@@ -75,6 +75,11 @@ python = "3.12.*"
 [feature.py39.dependencies]
 python = "3.9.*"
 
+# Use clang-cl on Windows
+[feature.clang-cl]
+platforms = ["win-64"]
+activation = { env = { CC = "clang-cl", CXX = "clang-cl" } }
+
 [environments]
 default = { features = ["py312"], solve-group = "py312" }
 lint = { features = ["lint"], solve-group = "py312" }
@@ -83,3 +88,8 @@ accelerate = { features = ["accelerate", "py312"], solve-group = "py312" }
 py39 = { features = ["py39"], solve-group = "py39" }
 all = { features = ["all", "py312"], solve-group = "py312" }
 all-py39 = { features = ["all", "py39"], solve-group = "py39" }
+all-clang-cl = { features = [
+  "all",
+  "clang-cl",
+  "py312",
+], solve-group = "py312" }