mirror of https://github.com/google/benchmark.git
115 lines
3.8 KiB
Python
115 lines
3.8 KiB
Python
import contextlib
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import os
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import platform
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import shutil
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import sysconfig
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from pathlib import Path
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from typing import Generator
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import setuptools
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from setuptools.command import build_ext
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PYTHON_INCLUDE_PATH_PLACEHOLDER = "<PYTHON_INCLUDE_PATH>"
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IS_WINDOWS = platform.system() == "Windows"
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IS_MAC = platform.system() == "Darwin"
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@contextlib.contextmanager
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def temp_fill_include_path(fp: str) -> Generator[None, None, None]:
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"""Temporarily set the Python include path in a file."""
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with open(fp, "r+") as f:
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try:
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content = f.read()
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replaced = content.replace(
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PYTHON_INCLUDE_PATH_PLACEHOLDER,
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Path(sysconfig.get_paths()["include"]).as_posix(),
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)
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f.seek(0)
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f.write(replaced)
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f.truncate()
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yield
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finally:
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# revert to the original content after exit
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f.seek(0)
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f.write(content)
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f.truncate()
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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):
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super().__init__(name=name, sources=[])
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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 bazel_build(self, ext: BazelExtension) -> None:
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"""Runs the bazel build to create the package."""
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with temp_fill_include_path("WORKSPACE"):
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temp_path = Path(self.build_temp)
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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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]
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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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if platform.machine() == "x86_64":
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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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# cross-compilation for Mac ARM64 on GitHub Mac x86 runners.
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# ARCHFLAGS is set by cibuildwheel before macOS wheel builds.
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archflags = os.getenv("ARCHFLAGS", "")
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if "arm64" in archflags:
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bazel_argv.append("--cpu=darwin_arm64")
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bazel_argv.append("--macos_cpus=arm64")
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elif platform.machine() == "arm64":
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bazel_argv.append("--macos_minimum_os=11.0")
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self.spawn(bazel_argv)
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shared_lib_suffix = ".dll" if IS_WINDOWS else ".so"
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ext_name = ext.target_name + shared_lib_suffix
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ext_bazel_bin_path = (
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temp_path / "bazel-bin" / ext.relpath / ext_name
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)
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ext_dest_path = Path(self.get_ext_fullpath(ext.name))
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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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)
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],
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)
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