ci: Run Windows build with CMD

Author: jorisv

.github/workflows/ci-linux-osx-win-conda.yml

@@ -119,15 +119,15 @@ jobs:
 
     - name: Configure [Conda/Windows]
       if: contains(matrix.os, 'windows-')
-      shell: bash -l {0}
+      # It's better to use CMD to have all MSVC variables setup
+      shell: cmd /C CALL {0}
       run: |
-        echo $(where ccache)
         git submodule update --init
         mkdir build
         cd build
-        export CC=${{ matrix.compiler }}
-        export CXX=${{ matrix.compiler }}
-        cmake .. -GNinja -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache -DCMAKE_INSTALL_PREFIX=${CONDA_PREFIX}/Library -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_CXX_STANDARD=${{ matrix.cxx_std }} -DBUILD_PYTHON_INTERFACE:BOOL=ON -DPYTHON_SITELIB=${CONDA_PREFIX}/Lib/site-packages -DPYTHON_EXECUTABLE=${CONDA_PREFIX}/python.exe -DOpenMP_ROOT=$CONDA_PREFIX -DBUILD_WITH_OPENMP_SUPPORT:BOOL=ON -DLINK_PYTHON_INTERFACE_TO_OPENMP:BOOL=ON -DBUILD_DOCUMENTATION:BOOL=ON -DINSTALL_DOCUMENTATION:BOOL=ON
+        set CC=${{ matrix.compiler }}
+        set CXX=${{ matrix.compiler }}
+        cmake .. -GNinja -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache -DCMAKE_INSTALL_PREFIX=%CONDA_PREFIX%/Library -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_CXX_STANDARD=${{ matrix.cxx_std }} -DBUILD_PYTHON_INTERFACE:BOOL=ON -DPYTHON_SITELIB=%CONDA_PREFIX%/Lib/site-packages -DPYTHON_EXECUTABLE=%CONDA_PREFIX%/python.exe -DOpenMP_ROOT=%CONDA_PREFIX% -DBUILD_WITH_OPENMP_SUPPORT:BOOL=ON -DLINK_PYTHON_INTERFACE_TO_OPENMP:BOOL=ON -DBUILD_DOCUMENTATION:BOOL=ON -DINSTALL_DOCUMENTATION:BOOL=ON
 
     - name: Build [Conda]
       shell: bash -l {0}