build: macOS arm64 and musllinux wheels

* Build macOS arm64 wheels

- use macOS 11 to build wheels
- update cibuildwheel version
- add universal2 tag to the macOS architectures

* Use PEP 517 build system

- switch to PEP 517 build system
- switch CI to use `pip install .` rather than `setup.py install`

* Switch to macos-11 in test.yml workflow as well

* Fix musl linux build

* Migrate cibuildwheel configuration to pyproject.toml

* Keep pre-release build *only* for builds that won't go to to PyPI

* Simplify list of builds to build

.github/workflows/build-wheels.yml

@@ -7,8 +7,9 @@ jobs:
     name: Build wheels on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-2019, macos-10.15]
+        os: [ubuntu-20.04, windows-2019, macos-11]
 
     steps:
       - uses: actions/checkout@v2
@@ -20,11 +21,8 @@ jobs:
         with:
           platforms: all
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.0.1
+        uses: pypa/cibuildwheel@v2.8.1
         with:
           output-dir: ./wheelhouse
         env:
-          CIBW_BUILD: "cp36-* cp37-* cp38-* cp39-* cp310-*"
-          CIBW_ARCHS_LINUX: auto aarch64
           CIBW_PRERELEASE_PYTHONS: True
-          CIBW_BEFORE_ALL_LINUX: yum install -y libffi-devel

.github/workflows/release-wheels.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-2019, macos-10.15]
+        os: [ubuntu-20.04, windows-2019, macos-11]
 
     steps:
       - uses: actions/checkout@v2
@@ -23,14 +23,9 @@ jobs:
         with:
           platforms: all
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.0.1
+        uses: pypa/cibuildwheel@v2.8.1
         with:
           output-dir: ./wheelhouse
-        env:
-          CIBW_BUILD: "cp36-* cp37-* cp38-* cp39-* cp310-*"
-          CIBW_ARCHS_LINUX: auto aarch64
-          CIBW_PRERELEASE_PYTHONS: True
-          CIBW_BEFORE_ALL_LINUX: yum install -y libffi-devel
       - uses: actions/upload-artifact@v2
         with:
           path: ./wheelhouse/*.whl

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-2019, macos-10.15]
+        os: [ubuntu-20.04, windows-2019, macos-11]
         python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10']
     steps:
     - uses: actions/checkout@v2
@@ -22,6 +22,6 @@ jobs:
     - name: Install dependencies
       run: python -m pip install -U setuptools wheel
     - name: Build package
-      run: python setup.py install
+      run: python -m pip install .
     - name: Run tests
       run: python tests/tests.py

pyproject.toml

@@ -0,0 +1,27 @@
+[build-system]
+requires = ["setuptools", "wheel", "cffi>=1.5.0"]
+build-backend = "setuptools.build_meta"
+
+[tool.cibuildwheel]
+build = "cp3*"
+
+[tool.cibuildwheel.linux]
+archs = ["auto", "aarch64"]
+before-all = """
+set -eux
+# musllinux_*
+if command -v apk; then
+    apk add libffi-dev
+fi
+# manylinux_2_24
+if command -v apt; then
+    apt install libffi-dev
+fi
+# manylinux_*
+if command -v yum; then
+    yum install -y libffi-devel
+fi
+"""
+
+[tool.cibuildwheel.macos]
+archs = ["x86_64", "universal2"]

setup.py

@@ -2,7 +2,12 @@
 # -*- coding: utf-8 -*-
 
 import codecs
+import os
 import re
+import sys
+
+# we have to import setup_cares.py which is in project's root folder
+sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)))
 
 from setuptools import setup
 
@@ -40,7 +45,6 @@ def get_version():
           'Programming Language :: Python :: Implementation :: PyPy',
       ],
       cmdclass         = {'build_ext': cares_build_ext},
-      setup_requires   = ['cffi>=1.5.0'],
       install_requires = ['cffi>=1.5.0'],
       extras_require   = {'idna': ['idna >= 2.1']},
       cffi_modules     = ['src/_cffi_src/build_cares.py:ffi'],