Add support for Python 3.11. (#253)

* Add support for Python 3.11.
* Do not use the binary version of coverage as it has a Python 3.11 wheel on PyPI which is not ABI compatible with the current alpha release and caused segfaults.
* Do not push wheels of Python future releases to PyPI.

6 files changed, 23 insertions, 9 deletions

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index af8c46f..cc350c2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -104,6 +104,7 @@ jobs:
           - "3.8"
           - "3.9"
           - "3.10"
+          - "3.11.0-alpha.4"
         os: [ubuntu-20.04, macos-latest]
         exclude:
           - os: macos-latest
@@ -143,7 +144,6 @@ jobs:
         run: |
           pip install -U pip
           pip install -U setuptools wheel twine cffi
-          pip install -U coveralls coverage
 
       - name: Build zope.interface
         run: |
@@ -152,7 +152,6 @@ jobs:
           python setup.py build_ext -i
           python setup.py bdist_wheel
           # Also install it, so that we get dependencies in the (pip) cache.
-          pip install -U coverage
           pip install -U 'faulthandler; python_version == "2.7" and platform_python_implementation == "CPython"'
           pip install .[test]
 
@@ -169,7 +168,12 @@ jobs:
         # We cannot 'uses: pypa/gh-action-pypi-publish@v1.4.1' because
         # that's apparently a container action, and those don't run on
         # the Mac.
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags') && startsWith(runner.os, 'Mac') && !startsWith(matrix.python-version, 'pypy')
+        if: >
+          github.event_name == 'push'
+          && startsWith(github.ref, 'refs/tags')
+          && startsWith(runner.os, 'Mac')
+          && !startsWith(matrix.python-version, 'pypy')
+          && !startsWith(matrix.python-version, '3.11.0-alpha.4')
         env:
           TWINE_PASSWORD: ${{ secrets.TWINE_PASSWORD }}
         run: |
@@ -191,6 +195,7 @@ jobs:
           - "3.8"
           - "3.9"
           - "3.10"
+          - "3.11.0-alpha.4"
         os: [ubuntu-20.04, macos-latest]
         exclude:
           - os: macos-latest
@@ -238,7 +243,7 @@ jobs:
         # works fine with non-editable installs.)
         run: |
           pip install -U wheel
-          pip install -U coverage
+          pip install -U --no-binary :all: coverage
           pip install -U 'faulthandler; python_version == "2.7" and platform_python_implementation == "CPython"'
           # Unzip into src/ so that testrunner can find the .so files
           # when we ask it to load tests from that directory. This
@@ -444,7 +449,10 @@ jobs:
         run: sudo chown -R $(whoami) ${{ steps.pip-cache.outputs.dir }}
       - name: Publish package to PyPI
         uses: pypa/gh-action-pypi-publish@v1.4.1
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+        if: >
+          github.event_name == 'push'
+          && startsWith(github.ref, 'refs/tags')
+          && !startsWith(matrix.python-version, '3.11.0-alpha.4')
         with:
           user: __token__
           password: ${{ secrets.TWINE_PASSWORD }}
diff --git a/.manylinux-install.sh b/.manylinux-install.sh
index 3b47736..7bb27b7 100755
--- a/.manylinux-install.sh
+++ b/.manylinux-install.sh
@@ -31,6 +31,7 @@ for PYBIN in /opt/python/*/bin; do
     if \
        [[ "${PYBIN}" == *"cp27"* ]] || \
        [[ "${PYBIN}" == *"cp35"* ]] || \
+       [[ "${PYBIN}" == *"cp311"* ]] || \
        [[ "${PYBIN}" == *"cp36"* ]] || \
        [[ "${PYBIN}" == *"cp37"* ]] || \
        [[ "${PYBIN}" == *"cp38"* ]] || \
diff --git a/.meta.toml b/.meta.toml
index 5ff5122..b4ae459 100644
--- a/.meta.toml
+++ b/.meta.toml
@@ -2,7 +2,7 @@
 # https://github.com/zopefoundation/meta/tree/master/config/c-code
 [meta]
 template = "c-code"
-commit-id = "23625f0c67c2171441dbe2069830d3b3fdb17757"
+commit-id = "a326a385c9c33fdb9d01ac2bfc6111a83a003f2a"
 
 [python]
 with-appveyor = true
@@ -10,7 +10,7 @@ with-pypy = true
 with-legacy-python = true
 with-sphinx-doctests = true
 with-windows = false
-with-future-python = false
+with-future-python = true
 with-docs = true
 
 [tox]
@@ -61,7 +61,7 @@ additional-install = [
     "  # works fine with non-editable installs.)",
     "  run: |",
     "    pip install -U wheel",
-    "    pip install -U coverage",
+    "    pip install -U --no-binary :all: coverage",
     "    pip install -U 'faulthandler; python_version == \"2.7\" and platform_python_implementation == \"CPython\"'",
     "    # Unzip into src/ so that testrunner can find the .so files",
     "    # when we ask it to load tests from that directory. This",
diff --git a/CHANGES.rst b/CHANGES.rst
index 6aa9884..9cb6e63 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@
 5.5.0 (unreleased)
 ==================
 
-- Add support for Python 3.10.
+- Add support for Python 3.10 and 3.11 (as of 3.11.0a4).
 
 - Add missing Trove classifier showing support for Python 3.9.
 
diff --git a/appveyor.yml b/appveyor.yml
index b334494..9f14aee 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,6 +24,10 @@ environment:
     - python: 39-x64
     - python: 310
     - python: 310-x64
+    # `multibuild` cannot install non-final versions as they are not on
+    # ftp.python.org, so we skip Python 3.11 until its final release:
+    # - python: 311
+    # - python: 311-x64
 
 install:
   - "SET PYTHONVERSION=%PYTHON%"
diff --git a/tox.ini b/tox.ini
index f614f3f..d366ac9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,7 @@ envlist =
     py38,py38-pure
     py39,py39-pure
     py310,py310-pure
+    py311,py311-pure
     pypy
     pypy3
     docs