Build wheels on CI

.github/workflows/wheels.yml

@@ -0,0 +1,36 @@
+name: build wheels
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    # Check all PR
+
+jobs:
+  build_wheels:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, windows-2019, macOS-11]
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - uses: actions/setup-python@v3
+
+      - name: Install cibuildwheel
+        run: python -m pip install cibuildwheel==2.11.2
+
+      - name: Build wheels
+        run: python -m cibuildwheel --output-dir wheelhouse
+        env:
+          CIBW_BUILD: cp39-*
+          CIBW_SKIP: cp39-musllinux*
+          CIBW_ARCHS_MACOS: x86_64 arm64
+
+      - uses: actions/upload-artifact@v3
+        with:
+          path: ./wheelhouse/*.whl

setup.cfg

@@ -24,10 +24,15 @@ classifiers =
     Topic :: Software Development :: Libraries :: Python Modules
     Topic :: Utilities
 
+python_requires = >=3.6
+
 [options]
 zip_safe = False
-packages=find:
-package_dir=
+install_requires =
+    numpy
+
+packages = find:
+package_dir =
     =src
 
 [options.packages.find]

setup.py

@@ -69,11 +69,16 @@ def run(self):
         if sys.platform.startswith("darwin"):
             cmake_options.append("-DCMAKE_OSX_DEPLOYMENT_TARGET:STRING=10.9")
 
+        # ARCHFLAGS is used by cibuildwheel to pass the requested arch to the
+        # compilers
+        ARCHFLAGS = os.environ.get("ARCHFLAGS")
+        if ARCHFLAGS is not None:
+            cmake_options.append(f"-DCMAKE_C_FLAGS={ARCHFLAGS}")
+            cmake_options.append(f"-DCMAKE_CXX_FLAGS={ARCHFLAGS}")
+
         if os.getenv("CHFL_PY_INTERNAL_CHEMFILES"):
             cmake_options.append("-DCHFL_PY_INTERNAL_CHEMFILES=ON")
 
-        ninja_args = []
-
         subprocess.run(
             [CMAKE_EXECUTABLE, source_dir, *cmake_options],
             cwd=build_dir,
@@ -87,7 +92,6 @@ class cmake_build(build_ext):
     """build and install chemfiles with cmake"""
 
     def run(self):
-        source_dir = ROOT
         build_dir = os.path.join(ROOT, "build", "cmake-build")
 
         subprocess.run(
@@ -96,11 +100,6 @@ def run(self):
         )
 
 
-install_requires = ["numpy"]
-if sys.hexversion < 0x03040000:
-    install_requires.append("enum34")
-
-
 def _get_lib_ext():
     if sys.platform.startswith("win32"):
         ext = ".dll"
@@ -115,7 +114,6 @@ def _get_lib_ext():
 
 setup(
     version=__version__,
-    install_requires=install_requires,
     ext_modules=[
         # only declare the extension, it is built & copied as required by cmake
         # in the build_ext command