149 lines
4.8 KiB
Python
149 lines
4.8 KiB
Python
import contextlib
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import os
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import platform
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import re
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import shutil
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from pathlib import Path
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from typing import Any, Generator
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import setuptools
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from setuptools.command import build_ext
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IS_WINDOWS = platform.system() == "Windows"
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IS_MAC = platform.system() == "Darwin"
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IS_LINUX = platform.system() == "Linux"
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# hardcoded SABI-related options. Requires that each Python interpreter
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# (hermetic or not) participating is of the same major-minor version.
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version_tuple = tuple(int(i) for i in platform.python_version_tuple())
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py_limited_api = version_tuple >= (3, 12)
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options = {"bdist_wheel": {"py_limited_api": "cp312"}} if py_limited_api else {}
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def is_cibuildwheel() -> bool:
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return os.getenv("CIBUILDWHEEL") is not None
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@contextlib.contextmanager
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def _maybe_patch_toolchains() -> Generator[None, None, None]:
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"""
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Patch rules_python toolchains to ignore root user error
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when run in a Docker container on Linux in cibuildwheel.
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"""
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def fmt_toolchain_args(matchobj):
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suffix = "ignore_root_user_error = True"
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callargs = matchobj.group(1)
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# toolchain def is broken over multiple lines
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if callargs.endswith("\n"):
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callargs = callargs + " " + suffix + ",\n"
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# toolchain def is on one line.
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else:
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callargs = callargs + ", " + suffix
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return "python.toolchain(" + callargs + ")"
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CIBW_LINUX = is_cibuildwheel() and IS_LINUX
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try:
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if CIBW_LINUX:
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module_bazel = Path("MODULE.bazel")
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content: str = module_bazel.read_text()
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module_bazel.write_text(
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re.sub(
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r"python.toolchain\(([\w\"\s,.=]*)\)",
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fmt_toolchain_args,
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content,
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)
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)
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yield
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finally:
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if CIBW_LINUX:
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module_bazel.write_text(content)
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class BazelExtension(setuptools.Extension):
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"""A C/C++ extension that is defined as a Bazel BUILD target."""
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def __init__(self, name: str, bazel_target: str, **kwargs: Any):
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super().__init__(name=name, sources=[], **kwargs)
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self.bazel_target = bazel_target
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stripped_target = bazel_target.split("//")[-1]
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self.relpath, self.target_name = stripped_target.split(":")
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class BuildBazelExtension(build_ext.build_ext):
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"""A command that runs Bazel to build a C/C++ extension."""
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def run(self):
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for ext in self.extensions:
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self.bazel_build(ext)
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super().run()
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# explicitly call `bazel shutdown` for graceful exit
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self.spawn(["bazel", "shutdown"])
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def copy_extensions_to_source(self):
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"""
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Copy generated extensions into the source tree.
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This is done in the ``bazel_build`` method, so it's not necessary to
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do again in the `build_ext` base class.
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"""
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pass
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def bazel_build(self, ext: BazelExtension) -> None:
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"""Runs the bazel build to create the package."""
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temp_path = Path(self.build_temp)
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# omit the patch version to avoid build errors if the toolchain is not
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# yet registered in the current @rules_python version.
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# patch version differences should be fine.
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python_version = ".".join(platform.python_version_tuple()[:2])
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bazel_argv = [
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"bazel",
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"build",
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ext.bazel_target,
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f"--symlink_prefix={temp_path / 'bazel-'}",
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f"--compilation_mode={'dbg' if self.debug else 'opt'}",
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# C++17 is required by nanobind
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f"--cxxopt={'/std:c++17' if IS_WINDOWS else '-std=c++17'}",
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f"--@rules_python//python/config_settings:python_version={python_version}",
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]
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if ext.py_limited_api:
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bazel_argv += ["--@nanobind_bazel//:py-limited-api=cp312"]
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if IS_WINDOWS:
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# Link with python*.lib.
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for library_dir in self.library_dirs:
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bazel_argv.append("--linkopt=/LIBPATH:" + library_dir)
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elif IS_MAC:
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# C++17 needs macOS 10.14 at minimum
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bazel_argv.append("--macos_minimum_os=10.14")
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with _maybe_patch_toolchains():
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self.spawn(bazel_argv)
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if IS_WINDOWS:
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suffix = ".pyd"
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else:
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suffix = ".abi3.so" if ext.py_limited_api else ".so"
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ext_name = ext.target_name + suffix
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ext_bazel_bin_path = temp_path / "bazel-bin" / ext.relpath / ext_name
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ext_dest_path = Path(self.get_ext_fullpath(ext.name)).with_name(
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ext_name
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)
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shutil.copyfile(ext_bazel_bin_path, ext_dest_path)
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setuptools.setup(
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cmdclass=dict(build_ext=BuildBazelExtension),
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ext_modules=[
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BazelExtension(
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name="google_benchmark._benchmark",
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bazel_target="//bindings/python/google_benchmark:_benchmark",
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py_limited_api=py_limited_api,
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)
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],
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options=options,
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)
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