ci(macos): use omp enabled homebrew-llvm-clang

Ref
- https://github.com/Rdatatable/data.table/wiki/Installation/370c4629742886190c08de5e199a8ca8d3d86b24
- https://github.com/actions/runner-images/blob/5c04ad10e394b07619bd68a62b3cd7665e7a3cb3/images/macos/macos-14-arm64-Readme.md

.github/workflows/tests.yml

@@ -36,6 +36,18 @@ jobs:
           conda install -c conda-forge pocl pyopencl
           python -c 'import pyopencl as cl'
         if: ${{ runner.os != 'Windows' }}
+      - name: Setup compyle config on MacOS to use openmp enabled clang from homebrew
+        run:
+          mkdir -p ~/.compyle
+          touch ~/.compyle/config.py
+          echo "import os" >> ~/.compyle/config.py
+          echo "os.environ['CC'] = '$(brew --prefix llvm@15)/bin/clang'" >> ~/.compyle/config.py
+          echo "os.environ['CXX'] = '$(brew --prefix llvm@15)/bin/clang++'" >> ~/.compyle/config.py
+          export CPPFLAGS="-I$(brew --prefix libomp)/include"
+          export LDFLAGS="-L$(brew --prefix libomp)/lib"
+          python -c "import os; OMP_CFLAGS=os.environ.get('CPPFLAGS').split(', '); print(f'{OMP_CFLAGS=}')" >> ~/.compyle/config.py
+          python -c "import os; OMP_LINK=os.environ.get('LDFLAGS').split(', '); print(f'{OMP_LINK=}')" >> ~/.compyle/config.py
+        if: ${{ runner.os == 'macOS' }}
       - name: Install dependencies
         run: |
           conda info

.github/workflows/zoltan-tests.yml

@@ -44,8 +44,8 @@ jobs:
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install mpi4py
           python -m pip install https://github.com/pypr/cyarray/zipball/master
-          python -m pip install --no-build-isolation https://github.com/pypr/pyzoltan/zipball/master
           python -m pip install https://github.com/pypr/compyle/zipball/master
+          python -m pip install --no-build-isolation https://github.com/pypr/pyzoltan/zipball/master
           python -m pip install -r requirements.txt
           python -m pip install -r requirements-test.txt
           python setup.py develop

setup.py

@@ -127,7 +127,7 @@ def _get_openmp_flags():
         return ['/openmp'], []
     elif sys.platform == 'darwin':
         if (os.environ.get('CC') is not None and
-           os.environ.get('CXX') is not None):
+            os.environ.get('CXX') is not None):
             return ['-fopenmp'], ['-fopenmp']
         else:
             return ['-Xpreprocessor', '-fopenmp'], ['-lomp']