使用tox构建含C扩展的Python2.7包时无法定位源码求助

Hey there, let's break down why this is happening and how to fix it quickly.

The root cause here is the changedir={envdir} line in your tox.ini—this tells tox to switch its working directory to the virtual environment folder (like /home/user/helloworld-release/.tox/py27/) when running commands. But your setup.py references HelloWorld.c using a path relative to your project root, so when tox runs setup.py from the virtual env directory, gcc can't find the file.

Here are two solid solutions:

Solution 1: Remove the changedir Configuration (Recommended) #

This is the simplest fix. Just delete the changedir={envdir} line from your tox.ini:

[tox]
envlist = py27
[testenv]
wheel=true
basepython=py27: python2.7
deps= pytest numpy
commands= {envpython} {toxinidir}/runtests.py --mode=full {posargs:}

Now tox will run all commands from your project root directory, so setup.py can easily locate HelloWorld.c using the relative path you already have.

Solution 2: Use Absolute Paths for C Sources (If You Need changedir) #

If you have a reason to keep changedir={envdir}, modify your setup.py to use absolute paths for the C source files. This ensures the path is correct no matter where setup.py is run from:

import os
del os.link
from setuptools import setup, Extension, find_packages

# Get the absolute path of your project root directory
project_root = os.path.dirname(os.path.abspath(__file__))

module1 = Extension(
    '_HelloWorld_py',
    sources=[os.path.join(project_root, 'HelloWorld.c')],
    include_dirs=['/usr/lib64/python2.7/site-packages/numpy/core/include/'],
    extra_compile_args=['-std=c99', '-Wno-error=vla']
)

setup(
    name='HelloWorld',
    version='0.1',
    description='Hello World',
    package_data={'': ['*.h', '*.c']},
    ext_modules=[module1]
)

Test the Fix #

After making either change, re-run the command:

tox --wheel

Your C extension should compile successfully now, and tox will generate the wheel package as expected.

Quick side note: Your package_data setup is for including files in the final wheel, not for finding sources during compilation—so that part doesn't need to be touched.

内容的提问来源于stack exchange，提问作者ymc