[skip ci] python 3.9 wheels

.github/workflows/building.yml

@@ -10,8 +10,8 @@ jobs:
     strategy:
       matrix:
         os: [macos-10.15, ubuntu-18.04]
-        python-version: [3.9]
-        torch-version: [1.8.0]
+        python-version: [3.9] # [3.6, 3.7, 3.8, 3.9]
+        torch-version: [1.8.0]  # [1.8.0, 1.9.0]
         cuda-version: ['cpu', 'cu102', 'cu111']
         exclude:
           - os: macos-10.15

setup.py

@@ -34,7 +34,8 @@ def get_extensions():
         extra_link_args = ['-s']
 
         info = parallel_info()
-        if 'backend: OpenMP' in info and 'OpenMP not found' not in info:
+        if ('backend: OpenMP' in info and 'OpenMP not found' not in info
+                and sys.platform != 'darwin'):
             extra_compile_args['cxx'] += ['-DAT_PARALLEL_OPENMP']
             if sys.platform == 'win32':
                 extra_compile_args['cxx'] += ['/openmp']