set building macos universal wheel

Author: Czaki

.github/workflows/wheel.yml

@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-2019]
+        os: [ubuntu-20.04, macos-10.15, windows-2019]
         architecture: ['x64']
         linux_archs: ["auto s390x"]
         include:
@@ -78,6 +78,8 @@ jobs:
       CIBW_SKIP: ${{ matrix.skip }}
       CIBW_ENVIRONMENT_WINDOWS: ${{ matrix.environment_windows }}
       CIBW_ARCHS_LINUX: ${{ matrix.linux_archs }}
+      CIBW_ARCHS_MACOS: x86_64 universal2
+      CIBW_TEST_SKIP: "*_arm64 *_universal2:arm64"
     steps:
       - uses: actions/checkout@v2
 

build_snappy.sh

@@ -15,8 +15,8 @@ case "$(uname -s)" in
    # See correspondence table at the bottom of this answer
 
    *)
-    cmake -S . -B "build"
-    cmake --build build --config Release --target install
+    cmake -S . -B "build" -DCMAKE_OSX_ARCHITECTURES="arm64;x86_64"
+    cmake --build build --config Release --target install 
      ;;
 esac
 

setup.py

@@ -42,10 +42,17 @@
 More details about Snappy library: http://google.github.io/snappy
 """
 
+library_dirs, include_dirs = [], []
+if os.environ.get("CIBUILDWHEEL", False) and sys.version_info[:2] == (3, 9) and sys.platform =="darwin":
+    library_dirs = ["/usr/local/lib/"]
+    include_dirs = ["/usr/local/include/"]
+
 
 snappymodule = Extension('snappy._snappy',
                          libraries=['snappy'],
-                         sources=['src/snappy/snappymodule.cc', 'src/snappy/crc32c.c'])
+                         sources=['src/snappy/snappymodule.cc', 'src/snappy/crc32c.c'],
+                         library_dirs=library_dirs,
+                         include_dirs=include_dirs)
 
 ext_modules = [snappymodule]
 packages = ['snappy']