Set MACOSX_DEPLOYMENT_TARGET in macOS builds

.github/workflows/workflow.yml

@@ -10,6 +10,10 @@ on:
     types:
       - published
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 jobs:
   build_macos_wheels:
     name: macOS (${{ matrix.os }})
@@ -29,6 +33,7 @@ jobs:
             python -m whisper_cpp -h
           CIBW_ARCHS_MACOS: "native"
           CIBW_BUILD: "cp312-*"
+          MACOSX_DEPLOYMENT_TARGET: ${{ matrix.os == 'macos-13' && '10.12' || '11.0' }}
 
       - uses: actions/upload-artifact@v4
         with:
@@ -84,6 +89,25 @@ jobs:
           name: cibw-sdist
           path: dist/*.tar.gz
 
+  # Verify that the x86_64 wheels work on macOS 11.
+  test_macos_11:
+    name: Test macOS 11
+    runs-on: macos-11
+    needs: build_macos_wheels
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/download-artifact@v4
+      with:
+        name: cibw-wheels-macos-13-0
+        path: wheelhouse
+
+    - name: Install wheel
+      run: pip install wheelhouse/*.whl
+
+    - name: Test wheel
+      run: python -m whisper_cpp -h
+
   upload_pypi:
     needs: [ build_macos_wheels, build_linux_wheels, build_sdist ]
     runs-on: ubuntu-latest

hatch_build.py

@@ -67,16 +67,19 @@ def _infer_tag(self) -> str:
         tag = next(sys_tags())
         tag_platform = tag.platform
 
-        archflags = os.environ.get("ARCHFLAGS", "")
+        # On macOS, set the version based on `MACOSX_DEPLOYMENT_TARGET`.
         if sys.platform == "darwin":
-            if archflags and sys.version_info[:2] >= (3, 8):
-                import platform
-                import re
-
-                archs = re.findall(r"-arch (\S+)", archflags)
-                if archs:
-                    current_arch = platform.mac_ver()[2]
-                    new_arch = "universal2" if set(archs) == {"x86_64", "arm64"} else archs[0]
-                    tag_platform = f"{tag_platform[: tag_platform.rfind(current_arch)]}{new_arch}"
+            macosx_deployment_target = os.environ.get("MACOSX_DEPLOYMENT_TARGET")
+            if macosx_deployment_target:
+                # Extract the architecture from, e.g., `macosx_14_0_arm64`.
+                if tag_platform.endswith("_arm64"):
+                    tag_arch = "arm64"
+                elif tag_platform.endswith("_x86_64"):
+                    tag_arch = "x86_64"
+                else:
+                    raise ValueError(f"Unknown macOS arch: {tag_platform}")
+
+                # Reconstruct the platform tag with the architecture.
+                tag_platform = f"macosx_{macosx_deployment_target.replace('.', '_')}_{tag_arch}"
 
         return f"py3-none-{tag_platform}"