setuptools version
setuptools==72.2.0
Python version
Python 3.8.16 (PyPy 7.3.11)
OS
Ubuntu 20.04
Additional environment information
This issue occurs only when I run setuptools with PyPy; it works fine with CPython. Downgrading to setuptools version 72.1.0 resolves the issue for both PyPy and CPython.
Description
When building a Cython extension that depends on a shared library, setuptools triggers a TypeError during the linking process.
Expected behavior
setuptools doesn't fail.
How to Reproduce
Create a file named hello_world.cpp:
// hello_world.cpp
#include <iostream>
extern "C" void print_hello() {
std::cout << "Hello, World!" << std::endl;
}
Create a file named hello_world.h:
// hello_world.h
#ifndef HELLO_WORLD_H
#define HELLO_WORLD_H
extern "C" void print_hello();
#endif // HELLO_WORLD_H
On Linux, compile this into a shared library using:
g++ -c -fPIC hello_world.cpp -o hello_world.o
g++ -shared hello_world.o -o libhello_world.so
Create a file named hello.pyx:
# hello.pyx
cdef extern from "hello_world.h":
void print_hello()
def call_print_hello():
print_hello()
Create a setup.py file to build the Cython extension:
# setup.py
from setuptools import setup, Extension
from Cython.Build import cythonize
extensions = [
Extension(
"hello",
["hello.pyx"],
language="c++",
include_dirs=["."],
library_dirs=["."],
libraries=["hello_world"],
extra_compile_args=["-std=c++11"]
)
]
setup(
name="hello",
ext_modules=cythonize(extensions),
)
Run the following command in the terminal:
python setup.py build_ext --inplace
Output
Traceback (most recent call last):
File "setup.py", line 17, in <module>
setup(
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/__init__.py", line 108, in setup
return distutils.core.setup(**attrs)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/core.py", line 184, in setup
return run_commands(dist)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/core.py", line 200, in run_commands
dist.run_commands()
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/dist.py", line 964, in run_commands
self.run_command(cmd)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/dist.py", line 945, in run_command
super().run_command(command)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/dist.py", line 983, in run_command
cmd_obj.run()
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/command/build_ext.py", line 93, in run
_build_ext.run(self)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/command/build_ext.py", line 359, in run
self.build_extensions()
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/command/build_ext.py", line 476, in build_extensions
self._build_extensions_serial()
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/command/build_ext.py", line 502, in _build_extensions_serial
self.build_extension(ext)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/command/build_ext.py", line 254, in build_extension
_build_ext.build_extension(self, ext)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/Cython/Distutils/build_ext.py", line 135, in build_extension
super(build_ext, self).build_extension(ext)
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/command/build_ext.py", line 581, in build_extension
self.compiler.link_shared_object(
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/ccompiler.py", line 757, in link_shared_object
self.link(
File "/home/daniel/.pyenv/versions/pypy3.8-7.3.11/lib/pypy3.8/site-packages/setuptools/_distutils/unixccompiler.py", line 269, in link
self.linker_exe
TypeError: 'NoneType' object is not subscriptable (key slice(None, None, None))
setuptools version
setuptools==72.2.0
Python version
Python 3.8.16 (PyPy 7.3.11)
OS
Ubuntu 20.04
Additional environment information
This issue occurs only when I run setuptools with PyPy; it works fine with CPython. Downgrading to setuptools version 72.1.0 resolves the issue for both PyPy and CPython.
Description
When building a Cython extension that depends on a shared library, setuptools triggers a
TypeErrorduring the linking process.Expected behavior
setuptools doesn't fail.
How to Reproduce
Create a file named
hello_world.cpp:Create a file named
hello_world.h:On Linux, compile this into a shared library using:
Create a file named
hello.pyx:Create a
setup.pyfile to build the Cython extension:Run the following command in the terminal:
Output