Bump oldest supported Python to 3.10, eliminate setuptools-scm (#1842)

* Supply MacOS deployment target to delocate, use build+uv frontend

This shaves off multiple minutes from the wheel builds alone.

Also revert to trusted publishing for wheel uploads as it is now set up.

* Bump oldest supported Python to 3.10, eliminate setuptools-scm

The version is now a string again, under the same attribute as it was
before. This is a pragmatic decision in order to be able to upload wheels
again, possibly directly from main.

We could in the future also set the Python version to a development version
if we want to avoid accidental uploads of `main`.

* Add a note on supported Python versions in the docs

Also fixes the setuptools failure observed in the latest CI by pinning
to the last version before v73 until the problem is identified and resolved.

.github/workflows/wheels.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Install Python 3.12
         uses: actions/setup-python@v5
         with:
-          python-version: 3.12
+          python-version: "3.12"
       - run: python -m pip install build
       - name: Build sdist
         run: python -m build --sdist
@@ -40,68 +40,23 @@ jobs:
         with:
           fetch-depth: 0
 
+      - uses: actions/setup-python@v5
+        name: Install Python 3.12
+        with:
+          python-version: "3.12"
+      - run: pip install --upgrade pip uv
+
       - name: Set up QEMU
         if: runner.os == 'Linux'
         uses: docker/setup-qemu-action@v3
         with:
           platforms: all
 
-      - name: Build 3.8 wheels on ${{ matrix.os }} using cibuildwheel
+      - name: Build wheels on ${{ matrix.os }} using cibuildwheel
         uses: pypa/cibuildwheel@v2.20
         env:
-          CIBW_BUILD: "cp38-*"
-          CIBW_SKIP: "*-musllinux_*"
-          CIBW_TEST_SKIP: "cp38-macosx_*:arm64"
-          CIBW_ARCHS_LINUX: auto64 aarch64
-          CIBW_ARCHS_WINDOWS: auto64
-          CIBW_BEFORE_ALL_LINUX: bash .github/install_bazel.sh
-          # Grab the rootless Bazel installation inside the container.
-          CIBW_ENVIRONMENT_LINUX: PATH=$PATH:$HOME/bin
-          CIBW_TEST_COMMAND: python {project}/bindings/python/google_benchmark/example.py
-
-      - name: Build 3.9 wheels on ${{ matrix.os }} using cibuildwheel
-        uses: pypa/cibuildwheel@v2.20
-        env:
-          CIBW_BUILD: "cp39-*"
-          CIBW_SKIP: "*-musllinux_*"
-          CIBW_TEST_SKIP: "cp38-macosx_*:arm64"
-          CIBW_ARCHS_LINUX: auto64 aarch64
-          CIBW_ARCHS_WINDOWS: auto64
-          CIBW_BEFORE_ALL_LINUX: bash .github/install_bazel.sh
-          # Grab the rootless Bazel installation inside the container.
-          CIBW_ENVIRONMENT_LINUX: PATH=$PATH:$HOME/bin
-          CIBW_TEST_COMMAND: python {project}/bindings/python/google_benchmark/example.py
-
-      - name: Build 3.10 wheels on ${{ matrix.os }} using cibuildwheel
-        uses: pypa/cibuildwheel@v2.20
-        env:
-          CIBW_BUILD: "cp310-*"
-          CIBW_SKIP: "*-musllinux_*"
-          CIBW_TEST_SKIP: "cp38-macosx_*:arm64"
-          CIBW_ARCHS_LINUX: auto64 aarch64
-          CIBW_ARCHS_WINDOWS: auto64
-          CIBW_BEFORE_ALL_LINUX: bash .github/install_bazel.sh
-          # Grab the rootless Bazel installation inside the container.
-          CIBW_ENVIRONMENT_LINUX: PATH=$PATH:$HOME/bin
-          CIBW_TEST_COMMAND: python {project}/bindings/python/google_benchmark/example.py
-
-      - name: Build 3.11 wheels on ${{ matrix.os }} using cibuildwheel
-        uses: pypa/cibuildwheel@v2.20
-        env:
-          CIBW_BUILD: "cp311-*"
-          CIBW_SKIP: "*-musllinux_*"
-          CIBW_TEST_SKIP: "cp38-macosx_*:arm64"
-          CIBW_ARCHS_LINUX: auto64 aarch64
-          CIBW_ARCHS_WINDOWS: auto64
-          CIBW_BEFORE_ALL_LINUX: bash .github/install_bazel.sh
-          # Grab the rootless Bazel installation inside the container.
-          CIBW_ENVIRONMENT_LINUX: PATH=$PATH:$HOME/bin
-          CIBW_TEST_COMMAND: python {project}/bindings/python/google_benchmark/example.py
-
-      - name: Build 3.12 wheels on ${{ matrix.os }} using cibuildwheel
-        uses: pypa/cibuildwheel@v2.20
-        env:
-          CIBW_BUILD: "cp312-*"
+          CIBW_BUILD: "cp310-* cp311-* cp312-*"
+          CIBW_BUILD_FRONTEND: "build[uv]"
           CIBW_SKIP: "*-musllinux_*"
           CIBW_TEST_SKIP: "cp38-macosx_*:arm64"
           CIBW_ARCHS_LINUX: auto64 aarch64
@@ -110,6 +65,8 @@ jobs:
           # Grab the rootless Bazel installation inside the container.
           CIBW_ENVIRONMENT_LINUX: PATH=$PATH:$HOME/bin
           CIBW_TEST_COMMAND: python {project}/bindings/python/google_benchmark/example.py
+          # unused by Bazel, but needed explicitly by delocate on MacOS.
+          MACOSX_DEPLOYMENT_TARGET: "10.14"
 
       - name: Upload Google Benchmark ${{ matrix.os }} wheels
         uses: actions/upload-artifact@v4
@@ -133,11 +90,11 @@ jobs:
     name: Publish google-benchmark wheels to PyPI
     needs: [merge_wheels]
     runs-on: ubuntu-latest
+    if: github.event_name == 'release' && github.event.action == 'published'
+    permissions:
+      id-token: write
     steps:
       - uses: actions/download-artifact@v4
         with:
           path: dist
       - uses: pypa/gh-action-pypi-publish@release/v1
-        with:
-          user: __token__
-          password: ${{ secrets.PYPI_PASSWORD }}

.pre-commit-config.yaml

@@ -1,17 +1,17 @@
 repos:
   -   repo: https://github.com/keith/pre-commit-buildifier
-      rev: 6.4.0
+      rev: 7.1.2
       hooks:
       -   id: buildifier
       -   id: buildifier-lint
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.11.0
+    rev: v1.11.1
     hooks:
       - id: mypy
         types_or: [ python, pyi ]
         args: [ "--ignore-missing-imports", "--scripts-are-modules" ]
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.4.10
+    rev: v0.6.1
     hooks:
       - id: ruff
         args: [ --fix, --exit-non-zero-on-fix ]

bindings/python/google_benchmark/__init__.py

@@ -49,7 +49,8 @@ from google_benchmark._benchmark import (
     oNone as oNone,
     oNSquared as oNSquared,
 )
-from google_benchmark.version import __version__ as __version__
+
+__version__ = "1.9.0"
 
 
 class __OptionMaker:

bindings/python/google_benchmark/version.py

@@ -1,7 +0,0 @@
-from importlib.metadata import PackageNotFoundError, version
-
-try:
-    __version__ = version("google-benchmark")
-except PackageNotFoundError:
-    # package is not installed
-    pass

docs/dependencies.md

@@ -11,3 +11,9 @@ distributions include newer versions, for example:
 * Ubuntu 20.04 provides CMake 3.16.3
 * Debian 11.4 provides CMake 3.18.4
 * Ubuntu 22.04 provides CMake 3.22.1
+
+## Python
+
+The Python bindings require Python 3.10+ as of v1.9.0 (2024-08-16) for installation from PyPI.
+Building from source for older versions probably still works, though. See the [user guide](python_bindings.md) for details on how to build from source.
+The minimum theoretically supported version is Python 3.8, since the used bindings generator (nanobind) only supports Python 3.8+.

docs/releasing.md

@@ -8,16 +8,24 @@
     * `git log $(git describe --abbrev=0 --tags)..HEAD` gives you the list of
       commits between the last annotated tag and HEAD
     * Pick the most interesting.
-* Create one last commit that updates the version saved in `CMakeLists.txt` and `MODULE.bazel`
-  to the release version you're creating. (This version will be used if benchmark is installed
-  from the archive you'll be creating in the next step.)
+* Create one last commit that updates the version saved in `CMakeLists.txt`, `MODULE.bazel`,
+  and `bindings/python/google_benchmark/__init__.py` to the release version you're creating.
+  (This version will be used if benchmark is installed from the archive you'll be creating
+  in the next step.)
 
 ```
-project (benchmark VERSION 1.8.0 LANGUAGES CXX)
+# CMakeLists.txt
+project (benchmark VERSION 1.9.0 LANGUAGES CXX)
 ```
 
 ```
-module(name = "com_github_google_benchmark", version="1.8.0")
+# MODULE.bazel
+module(name = "com_github_google_benchmark", version="1.9.0")
+```
+
+```
+# google_benchmark/__init__.py
+__version__ = "1.9.0"
 ```
 
 * Create a release through github's interface
@@ -28,4 +36,3 @@ module(name = "com_github_google_benchmark", version="1.8.0")
       * `git push --force --tags origin`
 * Confirm that the "Build and upload Python wheels" action runs to completion
     * Run it manually if it hasn't run.
-    * IMPORTANT: When re-running manually, make sure to select the newly created `<tag>` as the workflow version in the "Run workflow" tab on the GitHub Actions page. 

pyproject.toml

@@ -1,25 +1,21 @@
 [build-system]
-requires = ["setuptools", "setuptools-scm[toml]", "wheel"]
+requires = ["setuptools<73"]
 build-backend = "setuptools.build_meta"
 
 [project]
 name = "google_benchmark"
 description = "A library to benchmark code snippets."
-requires-python = ">=3.8"
-license = {file = "LICENSE"}
+requires-python = ">=3.10"
+license = { file = "LICENSE" }
 keywords = ["benchmark"]
 
-authors = [
-    {name = "Google", email = "benchmark-discuss@googlegroups.com"},
-]
+authors = [{ name = "Google", email = "benchmark-discuss@googlegroups.com" }]
 
 classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: Apache Software License",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -29,14 +25,10 @@ classifiers = [
 
 dynamic = ["readme", "version"]
 
-dependencies = [
-    "absl-py>=0.7.1",
-]
+dependencies = ["absl-py>=0.7.1"]
 
 [project.optional-dependencies]
-dev = [
-    "pre-commit>=3.3.3",
-]
+dev = ["pre-commit>=3.3.3"]
 
 [project.urls]
 Homepage = "https://github.com/google/benchmark"
@@ -45,7 +37,7 @@ Repository = "https://github.com/google/benchmark.git"
 Discord = "https://discord.gg/cz7UX7wKC2"
 
 [tool.setuptools]
-package-dir = {"" = "bindings/python"}
+package-dir = { "" = "bindings/python" }
 zip-safe = false
 
 [tool.setuptools.packages.find]
@@ -53,8 +45,7 @@ where = ["bindings/python"]
 
 [tool.setuptools.dynamic]
 readme = { file = "README.md", content-type = "text/markdown" }
-
-[tool.setuptools_scm]
+version = { attr = "google_benchmark.__version__" }
 
 [tool.mypy]
 check_untyped_defs = true

setup.py

@@ -138,7 +138,6 @@ class BuildBazelExtension(build_ext.build_ext):
             dirs[:] = [d for d in dirs if "runfiles" not in d]
 
             for f in files:
-                print(f)
                 fp = Path(f)
                 should_copy = False
                 # we do not want the bare .so file included