我正在尝试通过 cmake 将 c++ 扩展作为子模块合并到现有的 python 库中。构建 C++ 扩展可以正常工作,并将其作为 python 模块导入也可以,但不能作为头库的子模块。
我有以下目录结构:
frontend/
foo.py
bar.py
backend/
backend.cpp
该扩展通过 pybind 绑定到 python 模块:
PYBIND11_MODULE(backend, m)
{
m.doc() = "backend c++ implementation"; // optional module docstring
m.def("method", &method, "The method I want to call from python.");
}
在 CMakeLists.txt 中,相关行是:
pybind11_add_module(backend "frontend/backend/backend.cpp")
我已按照说明表进行操作here https://stackoverflow.com/questions/42048421/how-to-package-a-python-c-extension-such-that-it-is-a-submodule-of-a-normal-pyth and here https://stackoverflow.com/questions/42585210/extending-setuptools-extension-to-use-cmake-in-setup-py编写 setup.py 脚本。我想最重要的几行看起来像这样:
from setuptools import setup, Extension, find_packages
from setuptools.command.build_ext import build_ext
from setuptools.command.test import test as TestCommand
class CMakeExtension(Extension):
def __init__(self, name, sourcedir=".", sources=[]):
Extension.__init__(self, name, sources=[])
class CMakeBuild(build_ext):
def run(self):
build_directory = os.path.abspath(self.build_temp)
if not os.path.exists(self.build_temp):
os.makedirs(self.build_temp)
cmake_list_dir = os.path.abspath(os.path.dirname(__file__))
print("-" * 10, "Running CMake prepare", "-" * 40)
subprocess.check_call(
["cmake", cmake_list_dir], cwd=self.build_temp,
)
print("-" * 10, "Building extensions", "-" * 40)
cmake_cmd = ["cmake", "--build", "."] + self.build_args
subprocess.check_call(cmake_cmd, cwd=self.build_temp)
# Move from build temp to final position
for ext in self.extensions:
self.move_output(ext)
def move_output(self, ext):
build_temp = Path(self.build_temp).resolve()
dest_path = Path(self.get_ext_fullpath(ext.name)).resolve()
source_path = build_temp / self.get_ext_filename(ext.name)
dest_directory = dest_path.parents[0]
dest_directory.mkdir(parents=True, exist_ok=True)
self.copy_file(source_path, dest_path)
extensions = [CMakeExtension("backend")]
setup(
name="frontend",
packages=["frontend"],
ext_modules=extensions,
cmdclass=dict(build_ext=CMakeBuild),
)
但这并不使backend
的子模块frontend
,而是一个独立的模块。所以这有效:
from backend import method
但为了避免与其他库的命名问题,我想要的是:
from frontend.backend import method
将 pybinding 或扩展调用中的命名更改为extensions = [CMakeExtension("frontend.backend")]
不幸的是没有解决我的问题,安装程序没有找到backend.<platform>.so
那么共享库,因为它寻找frontend/backend.<platform>.so
,它不存在。我该如何解决这个问题?