pybind / cmake_example Goto Github PK

Example pybind11 module built with a CMake-based build system

License: Other

CMake 5.15% Python 82.66% C++ 12.19%

cmake_example's Introduction

cmake_example for pybind11

CI	status
MSVC 2019
conda.recipe
pip builds
`cibuildwheel`

An example pybind11 module built with a CMake-based build system. This is useful for C++ codebases that have an existing CMake project structure. This is being replaced by scikit_build_example, which uses scikit-build-core, which is designed to allow Python packages to be driven from CMake without depending on setuptools. The approach here has some trade-offs not present in a pure setuptools build (see python_example) or scikit-build-core. Python 3.7+ required; see the commit history for older versions of Python.

Problems vs. scikit-build-core based example:

You have to manually copy fixes/additions when they get added to this example (like when Apple Silicon support was added)
Modern editable installs are not supported (scikit-build-core doesn't support them either yet, but probably will soon)
You are depending on setuptools, which can and will change
You are stuck with an all-or-nothing approach to adding cmake/ninja via wheels (scikit-build-core adds these only as needed, so it can be used on BSD, Cygwin, Pyodide, Android, etc)
You are stuck with whatever CMake ships with (scikit-build-core backports FindPython for you)

Prerequisites

A compiler with C++11 support
Pip 10+ or CMake >= 3.4 (or 3.14+ on Windows, which was the first version to support VS 2019)
Ninja or Pip 10+

Installation

Just clone this repository and pip install. Note the --recursive option which is needed for the pybind11 submodule:

git clone --recursive https://github.com/pybind/cmake_example.git
pip install ./cmake_example

With the setup.py file included in this example, the pip install command will invoke CMake and build the pybind11 module as specified in CMakeLists.txt.

Building the documentation

Documentation for the example project is generated using Sphinx. Sphinx has the ability to automatically inspect the signatures and documentation strings in the extension module to generate beautiful documentation in a variety formats. The following command generates HTML-based reference documentation; for other formats please refer to the Sphinx manual:

cd cmake_example/docs
make html

License

Pybind11 is provided under a BSD-style license that can be found in the LICENSE file. By using, distributing, or contributing to this project, you agree to the terms and conditions of this license.

Test call

import cmake_example
cmake_example.add(1, 2)

cmake_example's People

Contributors

Stargazers

Watchers

Forkers

sylvaincorlay dean0x7d skoch9 msis hkaiser stv0g seninp aardalath yunxingzuo junhyeokahn maxkferg chriscainx apojomovsky tmorioka rreece avlbanuba yoelk zdzhaoyong ax3l dejan-stankovic leoetlino esquires ruslankosarev yssource levinj ssteinbach yxlao schvarcz googol-lab mollenhauerm unixnme irista56 kozo2 thehamsta cblondinrtr jbarlow83 mzszym undefined-behavior jweinst1 danimtb metropolik fangeugene hhhlaing helloxms yuemingl tttapa codeboy5 jslee02 bramburn avilchess fagan2888 isuruf lejafar sangeeta97 hixio-mh maheshambule bramossiv mday299 xayjin jacobkahn yangky11 gregory-halverson windcandie fft001 majestrate joejiong shirleychau debeshmandal winksaville axsaucedo berkels henryiii erkandiken sarnold sthagen kamalnadjieb raymond-sun clappski algomorph fcooper8472 mstoelzle vltmrkls jingyibo123 ebadi pangge bjjwwang vickymzheng global-localhost global19 global19-atlassian-net marciogameiro xiaoqisz hietalajulius jgoppert unexploredtest learning-algorithm hatemselim94 evanmu96 changdaxia-pts hanoch666

cmake_example's Issues

Process finished with exit code -1073741515

I'm receiving this error while tying to put together a simple pybind cmake example app.

Process finished with exit code -1073741515 (0xC0000135)

I've been google for hours now trying to figure out the source of this error. When i comment out the lines utilizing pybind (First 3 lines in main). It compiles and runs correctly and reaches the print statement. I'm pretty new to CMake so it's possible i set it up wrong. I added the lines pointing to python because I was receiving errors about missing python dll's. I'm using CLion and MSVS 2017 if that makes any difference.

example.cpp

#include <iostream>
#include <../pybind11/include/pybind11/pybind11.h>
#include <../pybind11/include/pybind11/embed.h>
#include <CImg.h>

namespace py = pybind11;
using namespace py::literals;

int main(int argc, char *argv[])
{
    py::scoped_interpreter guard{};

    auto example = py::module::import("example");
    auto resultobj = example.attr("add")(2,2);
    int result = resultobj.cast<int>();
    std::cout << result;
}

example.py

def add(a,b):
    return a+b

Cmakelists.txt:

cmake_minimum_required(VERSION 3.14)
project(TestApp)

set(CMAKE_CXX_STANDARD 11)
find_package(PythonLibs REQUIRED)
include_directories(${PYTHON_INCLUDE_DIRS})

link_directories(C:\\Users\\myuser\\AppData\\Local\\Programs\\Python\\Python37-32\\libs)

add_subdirectory(lib/pybind11)
include_directories(lib/CImg-2.6.7)

add_executable(example src/example.cpp)
target_link_libraries(example PRIVATE pybind11::embed)

File Structure

TestApp
----src/
--------example.cpp
----lib/
--------Cimg-2.6.7/
--------pybind/

Can't build html

Can't make the doc html

[autosummary] generating autosummary for: cmake_example.rst, index.rst
Failed to import 'cmake_example': no module named cmake_example
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 0 source files that are out of date
updating environment: 0 added, 1 changed, 0 removed
reading sources... [100%] cmake_example
/home/tumh/cmake_example/docs/cmake_example.rst:1: WARNING: autodoc: failed to import module u'cmake_example'; the following exception was raised:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/sphinx/ext/autodoc.py", line 386, in import_object
    __import__(self.modname)
ImportError: No module named cmake_example
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] index
/home/tumh/cmake_example/docs/index.rst:6: WARNING: toctree contains reference to document u'cmake_example' that doesn't have a title: no link will be generated
generating indices... genindex
writing additional pages... search
copying static files... WARNING: html_static_path entry u'/home/tumh/cmake_example/docs/_static' does not exist
done
copying extra files... done
dumping search index in English (code: en) ... done
dumping object inventory... done
build succeeded, 3 warnings.

Any idea?

Command line arguments OR calling python from CMake rather than the inverse

Thanks for the nice template. However...

I'm sometimes running into build problems, most recently I have some unresolved problem here (https://github.com/conda-forge/prrng-feedstock). The problem is that the CMake call is quite buried, and that makes the whole thing hard to debug, or adapt when needed. Did you even consider having either:

Command-line arguments to the setup.py (I'm honestly not sure that it even possible).
The inverse: calling setuptools from CMake (also there, not sure if it possible), but this would make everything so much nicer: only one place to customise, and in fact a command that can take command-line options.

Build requirements not working

The build requirements seems to be downloaded by the install process, but not actually found when building;

git clone https://github.com/pybind/cmake_example.git
cd cmake_example
pip3 install .
...

      Traceback (most recent call last):
        File "/private/var/folders/.../overlay/bin/cmake", line 5, in <module>
          from cmake import cmake
      ModuleNotFoundError: No module named 'cmake'

If you manually install using pip3 install cmake it works after that.

'build/lib.* does not exist

With my code that is almost identical to this example, I am getting on Linux/macOS (but not on Windows) that

...
 -- Build files have been written to: /tmp/pip-req-build-aua6es75/build/temp.linux-x86_64-3.9
ninja: no work to do.
 running install_lib
 warning: install_lib: 'build/lib.linux-x86_64-3.9' does not exist -- no Python modules to install

I.e. the *.so is created ok, but in the build/temp.* directory. It is never copied to the build/lib.* directory.

For reference, I am trying here : tdegeus/prrng#4

how to set path of extension

Hi:
I want to set extension's path not to site-packages root, like:

site-packages
    cmake_example
        __init__.py
        cmake_example.cp38-win_amd64.pyd

what should I do in setup.py?
Thanks!

Feature request: ability to import in poetry Python shell

It would be really nice if instead of needing to install the package using pip install ./cmake_example, you could use Poetry's built-in shell to run the package locally. I do this regularly with other packages that use poetry.

Example:

$ poetry run python
>>> import cmake_example
>>>

Access to PYTHON_VERSION_MAJOR/MINOR

When including pybind11 directly via add_subdirectory, the selected python interpreter would be useful to be queried, e.g. for install paths.

With find_package(pybind11) the variables PYTHON_VERSION_MAJOR and ..._MINOR leak into the caller's scope and can be queried, but add_subdirectory does proper encapsulation.

Can we maybe add PYTHON_VERSION_MAJOR and PYTHON_VERSION_MINOR as CMake target properties to the pybind11::pybind11 target? With that we could query it from a calling project (or maybe you have an alternative idea as well).

Make this a GitHub "template repo"

Hi,

you can make this a "template repository" on GitHub via: https://github.com/pybind/cmake_example/settings

From the docs:

You can make an existing repository a template, so you and others can generate new repositories with the same directory structure and files.

running "pip install ./cmake_example" will install the shared library into site-packages root folder, but not a dedicated subfolder

How can one make the package such that on running "pip install ./cmake_example" it creates a subfolder in site-packages named "cmake_example" which contains the shared library for cmake_example?

Import error on xubuntu 17.04

I'm not totally sure of the provenance (is it from pybind11 itself?), but when I try to load a compiled module (it compiles fine) with a cmake_example-based setup.py (https://github.com/usnistgov/NISTfit), on xubuntu 17.04, I get errors when I try to load the module. Some info:

xubuntu 17.04 64-bit
miniconda python (tried with both 2.7 and 3.6, same issue)

The cmake_example works just fine, as does the python_example in this environment, so I'm a bit at a loss to understand what is going on.

The error

ImportError: /home/ian/miniconda3/lib/python3.6/site-packages/matplotlib/../../../libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by /home/ian/miniconda3/lib/python3.6/site-packages/NISTfit.cpython-36m-x86_64-linux-gnu.so)

Where do I need to edit something in setup.py for my custom project

I write a library called AVP_Binding in c++ and want to import AVP_Binding in python. Everything is ok. c++ library can be compiled successfully and generate AVP-Binding.cpython-36m-x86_64-linux-gnu.so also.
My os is ubuntu 18.04, and I run pip install . in virtual enviorment in anacoda(python 3.6, cmake 3.14).
But when I run pip install . with the same setup.py in cmake_example it failed. The error follows:

Processing /home/xxx/Documents/my_project/AVP_Binding
Building wheels for collected packages: AVP-Binding
  Building wheel for AVP-Binding (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /home/xxx/anaconda3/envs/habitat/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-req-build-gvd95haj/setup.py'"'"'; __file__='"'"'/tmp/pip-req-build-gvd95haj/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-qbwspzl2
       cwd: /tmp/pip-req-build-gvd95haj/
  Complete output (45 lines):
  running bdist_wheel
  running build
  running build_ext
  CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
  CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
  CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
  -- Configuring incomplete, errors occurred!
  See also "/tmp/pip-req-build-gvd95haj/build/temp.linux-x86_64-3.6/CMakeFiles/CMakeOutput.log".
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/tmp/pip-req-build-gvd95haj/setup.py", line 113, in <module>
      zip_safe=False,
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/site-packages/setuptools/__init__.py", line 153, in setup
      return distutils.core.setup(**attrs)
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/core.py", line 148, in setup
      dist.run_commands()
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 955, in run_commands
      self.run_command(cmd)
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 974, in run_command
      cmd_obj.run()
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/site-packages/wheel/bdist_wheel.py", line 299, in run
      self.run_command('build')
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 974, in run_command
      cmd_obj.run()
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build.py", line 135, in run
      self.run_command(cmd_name)
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 974, in run_command
      cmd_obj.run()
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/site-packages/setuptools/command/build_ext.py", line 79, in run
      _build_ext.run(self)
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build_ext.py", line 339, in run
      self.build_extensions()
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
      self._build_extensions_serial()
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
      self.build_extension(ext)
    File "/tmp/pip-req-build-gvd95haj/setup.py", line 95, in build_extension
      ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp
    File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/subprocess.py", line 311, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '['cmake', '/tmp/pip-req-build-gvd95haj', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-req-build-gvd95haj/build/lib.linux-x86_64-3.6/', '-DPYTHON_EXECUTABLE=/home/xxx/anaconda3/envs/habitat/bin/python', '-DEXAMPLE_VERSION_INFO=0.0.1', '-DCMAKE_BUILD_TYPE=Release', '-GNinja']' returned non-zero exit status 1.
  ----------------------------------------
  ERROR: Failed building wheel for AVP-Binding
  Running setup.py clean for AVP-Binding
Failed to build AVP-Binding
Installing collected packages: AVP-Binding
    Running setup.py install for AVP-Binding ... error
    ERROR: Command errored out with exit status 1:
     command: /home/xxx/anaconda3/envs/habitat/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-req-build-gvd95haj/setup.py'"'"'; __file__='"'"'/tmp/pip-req-build-gvd95haj/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-vd7n5m0r/install-record.txt --single-version-externally-managed --compile --install-headers /home/xxx/anaconda3/envs/habitat/include/python3.6m/AVP-Binding
         cwd: /tmp/pip-req-build-gvd95haj/
    Complete output (47 lines):
    running install
    running build
    running build_ext
    CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
    CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
    CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
    -- Configuring incomplete, errors occurred!
    See also "/tmp/pip-req-build-gvd95haj/build/temp.linux-x86_64-3.6/CMakeFiles/CMakeOutput.log".
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-req-build-gvd95haj/setup.py", line 113, in <module>
        zip_safe=False,
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/site-packages/setuptools/__init__.py", line 153, in setup
        return distutils.core.setup(**attrs)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/site-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/install.py", line 545, in run
        self.run_command('build')
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/site-packages/setuptools/command/build_ext.py", line 79, in run
        _build_ext.run(self)
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build_ext.py", line 339, in run
        self.build_extensions()
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
        self._build_extensions_serial()
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
        self.build_extension(ext)
      File "/tmp/pip-req-build-gvd95haj/setup.py", line 95, in build_extension
        ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp
      File "/home/xxx/anaconda3/envs/habitat/lib/python3.6/subprocess.py", line 311, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '['cmake', '/tmp/pip-req-build-gvd95haj', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-req-build-gvd95haj/build/lib.linux-x86_64-3.6/', '-DPYTHON_EXECUTABLE=/home/xxx/anaconda3/envs/habitat/bin/python', '-DEXAMPLE_VERSION_INFO=0.0.1', '-DCMAKE_BUILD_TYPE=Release', '-GNinja']' returned non-zero exit status 1.
    ----------------------------------------
ERROR: Command errored out with exit status 1: /home/xxx/anaconda3/envs/habitat/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-req-build-gvd95haj/setup.py'"'"'; __file__='"'"'/tmp/pip-req-build-gvd95haj/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-vd7n5m0r/install-record.txt --single-version-externally-managed --compile --install-headers /home/xxx/anaconda3/envs/habitat/include/python3.6m/AVP-Binding Check the logs for full command output.

Besides name, author, author_email and description in setup, do I need to modify anything else in this setup.py?
My project is here https://github.com/wwtx9/AVP_Binding. It may help to find problem.

Building on Windows fails with a UnicodeDecodeError

I tried to build this example on Windows, but ran into an error.

Versions:

Windows 10 Pro 64bit
Python 3.6.1 32 bit
CMake 3.9.1

D:\github>pip install .\cmake_example
Processing o:\github\cmake_example
Installing collected packages: cmake-example
  Running setup.py install for cmake-example ... error
Exception:
Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\compat\__init__.py", line 73, in console_to_str
    return s.decode(sys.__stdout__.encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x81 in position 48: invalid start byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\commands\install.py", line 342, in run
    prefix=options.prefix_path,
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_set.py", line 784, in install
    **kwargs
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_install.py", line 878, in install
    spinner=spinner,
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 676, in call_subprocess
    line = console_to_str(proc.stdout.readline())
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\compat\__init__.py", line 75, in console_to_str
    return s.decode('utf_8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x81 in position 48: invalid start byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\commands\install.py", line 385, in run
    requirement_set.cleanup_files()
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_set.py", line 729, in cleanup_files
    req.remove_temporary_source()
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_install.py", line 977, in remove_temporary_source
    rmtree(self.source_dir)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 49, in wrapped_f
    return Retrying(*dargs, **dkw).call(f, *args, **kw)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 212, in call
    raise attempt.get()
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 247, in get
    six.reraise(self.value[0], self.value[1], self.value[2])
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\six.py", line 686, in reraise
    raise value
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 200, in call
    attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 102, in rmtree
    onerror=rmtree_errorhandler)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 494, in rmtree
    return _rmtree_unsafe(path, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 393, in _rmtree_unsafe
    onerror(os.rmdir, path, sys.exc_info())
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 114, in rmtree_errorhandler
    func(path)
PermissionError: [WinError 32] Der Prozess kann nicht auf die Datei zugreifen, da sie von einem anderen Prozess verwendet wird: 'C:\\Users\\Sysadmin\\AppData\\Local\\Temp\\pip-r3e3669_-build\\build\\temp.win32-3.6\\Release'

Why did I got shared library?

cmake ..
make
Than I got a "cmake_example.cpython-35m-x86_64-linux-gnu.so"
I can't be import like "import cmake_example" 。 What 's the problems of my operating？

Failed to import cmake_example

After successfully installing cmake_example after running pip install . command. I try to import cmake_example module, but it shows undefined symbol

(pybind11) xx@xx:~/code/cmake_example$ pip install . --user
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Processing /home/py/code/cmake_example
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: cmake-example
  Building wheel for cmake-example (pyproject.toml) ... done
  Created wheel for cmake-example: filename=cmake_example-0.0.1-cp38-cp38-linux_x86_64.whl size=48911 sha256=9ebbda22de67d214c2039da9003236fe2d8e8eda90c4e2bbee1f4fa7778d7aa5
  Stored in directory: /tmp/pip-ephem-wheel-cache-jcrqt4zq/wheels/15/39/14/4a8a39410655bf49353e750dd2e25ce81174f227c1bbb4635b
Successfully built cmake-example
Installing collected packages: cmake-example
Successfully installed cmake-example-0.0.1
(pybind11) xx@xx::~/code/cmake_example$ python
Python 3.8.10 (default, Nov 26 2021, 20:14:08) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cmake_example as m
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /home/py/.local/lib/python3.8/site-packages/cmake_example.cpython-38-x86_64-linux-gnu.so: undefined symbol: _ZTVN10__cxxabiv120__si_class_type_infoE

skbuild?

I tried to make a project depend on the Pypi cmake package to try to help a pip install with this template work more concisely, but there are headaches and incompatibilities if scikit-build is not brought up-to-date in a separate command before using this setup.py file. But it looks like using sk-build directly would simplify this setup.py file, but complicate the CMakeLists.txt. I'm trying it out in my project and I figure I'll share a minimal example from the results.

Should I issue a PR to this project proposing a setup.py in terms of skbuild? Or is there a reason that skbuild is not appropriate in this setup.py and should maybe be a separate example in the pybind ecosystem?

Copy DLL to Python site packages

Hi everybody,
I created a project based on this example. What my project basicaly does, is fetching data from an API. The API consists of a .lib, .h and .DLL file. I included the .h file in my CPP code and added the .lib via target_link_libraries in CMakeLists.txt.

After running pip install . the .pyd file gets copied to site packages, but after an import in python it fails because of the missing .DLL

I solved the problem by copying the DLL next to the pyd under site packages, but would like to automate this process. What would be the best way, to accomplish this?

I already tried adding package_data to setup.py without success.

How could I let main.cpp include functions written in other source files

I tried to understand how this example works, but I do not know what lines shall I add to the CMakeLists.txt if my main.cpp have include other headers and called the functions defined in these headers.

For example, I have a fun.cpp/fun.h sources files:

// fun.h
void print();
// fun.cpp
#include<iostream>
void print() {std::cout << "hello world" << endl;}

And in my main.cpp

#include<pybind11/pybind11.h>
#include"fun.h"

namespace py = pybind11;

PYBIND11_MODULE(main, m) {
    m.doc() = "some description of this module";

    m.def("print_", &print, "print hello world");
}

I tried to write a CMakeLists.txt

cmake_minimum_required(VERSION 2.8.12)
project(example)

add_library(fun fun.cpp)

add_subdirectory(pybind11)
pybind11_add_module(main SHARED main.cpp)

But this does not work, when I import from python side. What is the correct CMakeList.txt should be like please ?

How to mix python code with cmake built cpp code in a single package?

I'd like to use this template to create a python/c++ hybrid package, but it seems the package root module is even defined in main.cpp, can it be a init.py instead?

Kitware cmake wheel

It seems that kitware maintains a wheel for cmake!

https://pypi.python.org/pypi/cmake/

This could be interesting

to produce the pybind11Config.cmake files even on pypi
or projects like this one.

In the case of pybind11, the CMAKE_INSTALL_PREFIX would be a parent directory to locations.distutils_scheme('pybind11', *args, **kwargs)['headers']) I guess...

make: *** No rule to make target 'install'. Stop.

make: *** No rule to make target 'install'.  Stop.

used these commands

cd pybind11
mkdir build
cd build
cmake ..
make install

can anyone help with this

How can I create a module in a subdirectory?

Can I create a module called "cmake_sub_example" in a subdirectory with the same title? I am trying this because I want to use it in a bigger project where I intend to start cmake from the highest level.

python file can't import module after change pybind target name

I move the test_basic.py to project root directory and change the import path.
Then, I change the target name in CMakeLists.txt and module name in test_basic.py.
Then, "mkdir build; cd build; cmake ...; make", and everything goes well.
However, when i run the test_basic.py, I get
"Traceback (most recent call last):
File "test_basic.py", line 2, in
import build.bind_example as m
ImportError: dynamic module does not define module export function (PyInit_bind_example)
".

Besides, when I change the target name back to cmake_example, the python file import module normally,

Attached files is the version which target name is changed.
CMakeLists.txt

Build ok, but import library fail.

Hello,

Great job, dear. Very helpfull.

I created a project based on this repo. But I changed the name of the module to "calculadora" (I'm already doing an example in c++ to this name). Well, I used the same project, but changed the project name only.
The build and installation seem to work correctly, but when I called the import on the python console, I got this error.

import calculadora
Traceback (most recent call last):
File "", line 1, in
ModuleNotFoundError: No module named 'calculadora'

I can see the calculadora library in the pip3 list. Anyone could help me to understand it and fix it ?

I'm using the Ubuntu SO. Python 3.7.

Thanks.

Creating a source distribution (sdist)

Hi!

The setup.py script here is awesome and works great. I can successfully do pip install .\myproject to install locally and cd myproject && python setup.py bdist_wheel to create a wheel to distribute for the current platform. However what doesn't really work is creating a source distribution (sdist) so others can build it from pypi when a wheel is not available (or on Linux). python setup.py sdist runs and creates a .tar.gz, but it doesn't contain any source or CMake files so obviously it can't build. I read that there's different ways of including files in an sdist but I can't really figure out how to go on in the case of a CMake project like this. Has any of you worked with that before and encountered this issue?

Thanks!

module 'cmake_example' has no attribute 'add'

Hi,
I have cloned and used the cmake example. After installing it with pip, I am able to run the test.py. Now, I would like to use the pip installer instead of having the pybind code as submodule (using the binaries instead of the headers). So I installed the lib with "pip3 install pybind11", and access the library by adapting the CMakeList.txt:

cmake_minimum_required(VERSION 3.5)
project(pybind_decoder_lib)

set(LIDAR_PERCEPTION_DIR ${CMAKE_SOURCE_DIR}/../../../..)
include(${LIDAR_PERCEPTION_DIR}/common.cmake)

find_package(catkin REQUIRED COMPONENTS
  roscpp
  lidar_msgs
)

## Both Boost.python and Python libs are required.
find_package(pybind11 REQUIRED HINTS /home/user/.local/lib/python3.8/site-packages)

###################################
## catkin specific configuration ##
###################################
catkin_package(
	LIBRARIES pybind_decoder_lib
	CATKIN_DEPENDS roscpp
	#  DEPENDS system_lib
)

###########
## Build ##
###########

# include Boost and Python.
include_directories(
	include
	${catkin_INCLUDE_DIRS}
	${PYTHON_INCLUDE_DIRS}
	${pybind11_INCLUDE_DIRS}
	${pybind11_INCLUDE_DIR} # here I am not sure which spelling, so I try both
	)

## Declare a cpp library
pybind11_add_module(pybind_decoder_lib src/pybind_decoder_lib.cpp)

## Specify libraries to link a library or executable target against

# Don't prepend wrapper library name with lib and add to Python libs.
set_target_properties(pybind_decoder_lib PROPERTIES
	PREFIX ""
	LIBRARY_OUTPUT_DIRECTORY ${CATKIN_DEVEL_PREFIX}/${CATKIN_PACKAGE_PYTHON_DESTINATION})

Here is the CPP:

/// @file        pybind_decoder_lib.cpp
// ****************************************************************************

#include <pybind11/pybind11.h>

int add(int i, int j) {
    return i + j;
}

namespace py = pybind11;

PYBIND11_MODULE(pybind_decoder_lib, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring
    m.def("add", &add, R"pbdoc(
        Add two numbers
        Some other explanation about the add function.
    )pbdoc");

    m.def("subtract", [](int i, int j) { return i - j; }, R"pbdoc(
        Subtract two numbers
        Some other explanation about the subtract function.
    )pbdoc");

    m.attr("__version__") = "dev";
}

And finally, here is my python code):

import pybind_decoder_lib as m

# result = m.subtract(30, 14)
# print(result)
print(m.add(1, 2))

user@SI-C-0020Q:/work/catkin_ws/src/lidar_perception/pybind_decoder_lib/tst$ python3 test_basic.py
Traceback (most recent call last):
File "test_basic.py", line 5, in
print(m.add(1, 2))
AttributeError: module 'pybind_decoder_lib' has no attribute 'add'

When I check the binary with nm -D, it confirms the error, the python module exists, but does not have any add method. SO somehow the PYBIND11_MODULE macro fails, but I don t know why.

how to build with arm-linux-gcc

my host is x86-ubuntu, I need to build with my nxp-imx6ul with pybind.

I have build python for ubuntu and arm-board(nxp), then I want to build pybind,
I Use this example, set the arm-linux-gcc for this project,
so how to set python path( ubuntu and arm-python) to pybind11?

or how to change the cmakelist

Error when building with Ninja

Hello,

I'm trying to reproduce the installation within a conda virtual environment, on a Mac with the M1 chip.
CMake version 3.21.0 is installed, together with ninja version 1.10.0.git.kitware.jobserver-1 and Python 3.9.10

When running python3 -m pip install ., the following error log is produced

Processing /Users/marioberaha/dev/tests/cmake_example
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: cmake-example
  Building wheel for cmake-example (pyproject.toml) ... error
  ERROR: Command errored out with exit status 1:
   command: /opt/homebrew/opt/[email protected]/bin/python3.9 /opt/homebrew/lib/python3.9/site-packages/pip/_vendor/pep517/in_process/_in_process.py build_wheel /var/folders/c3/_f3tgzn14ylfqqgqhkdntngh0000gn/T/tmpsuhp61z1
       cwd: /Users/marioberaha/dev/tests/cmake_example
  Complete output (70 lines):
  running bdist_wheel
  running build
  running build_ext
  CMake Error at CMakeLists.txt:2 (project):
    Running
  
     '/private/var/folders/c3/_f3tgzn14ylfqqgqhkdntngh0000gn/T/pip-build-env-xjc41kgv/overlay/bin/ninja' '--version'
  
    failed with:
  
     No such file or directory
  
  
  -- Configuring incomplete, errors occurred!
  See also "/Users/marioberaha/dev/tests/cmake_example/build/temp.macosx-11-arm64-3.9/cmake_example/CMakeFiles/CMakeOutput.log".
  See also "/Users/marioberaha/dev/tests/cmake_example/build/temp.macosx-11-arm64-3.9/cmake_example/CMakeFiles/CMakeError.log".
  Traceback (most recent call last):
    File "/opt/homebrew/lib/python3.9/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 363, in <module>
      main()
    File "/opt/homebrew/lib/python3.9/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 345, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/opt/homebrew/lib/python3.9/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 261, in build_wheel
      return _build_backend().build_wheel(wheel_directory, config_settings,
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/build_meta.py", line 244, in build_wheel
      return self._build_with_temp_dir(['bdist_wheel'], '.whl',
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/build_meta.py", line 229, in _build_with_temp_dir
      self.run_setup()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/build_meta.py", line 174, in run_setup
      exec(compile(code, __file__, 'exec'), locals())
    File "setup.py", line 119, in <module>
      setup(
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/__init__.py", line 155, in setup
      return distutils.core.setup(**attrs)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/core.py", line 148, in setup
      return run_commands(dist)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/core.py", line 163, in run_commands
      dist.run_commands()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/dist.py", line 967, in run_commands
      self.run_command(cmd)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/dist.py", line 986, in run_command
      cmd_obj.run()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/wheel/bdist_wheel.py", line 299, in run
      self.run_command('build')
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/dist.py", line 986, in run_command
      cmd_obj.run()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/command/build.py", line 135, in run
      self.run_command(cmd_name)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/dist.py", line 986, in run_command
      cmd_obj.run()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/command/build_ext.py", line 79, in run
      _build_ext.run(self)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
      _build_ext.build_ext.run(self)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/command/build_ext.py", line 339, in run
      self.build_extensions()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
      _build_ext.build_ext.build_extensions(self)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/command/build_ext.py", line 448, in build_extensions
      self._build_extensions_serial()
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/setuptools/_distutils/command/build_ext.py", line 473, in _build_extensions_serial
      self.build_extension(ext)
    File "setup.py", line 113, in build_extension
      subprocess.check_call(["cmake", ext.sourcedir] + cmake_args, cwd=build_temp)
    File "/opt/homebrew/Cellar/[email protected]/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/subprocess.py", line 373, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '['cmake', '/Users/marioberaha/dev/tests/cmake_example', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/marioberaha/dev/tests/cmake_example/build/lib.macosx-11-arm64-3.9/', '-DPYTHON_EXECUTABLE=/opt/homebrew/Cellar/[email protected]/3.9.10/bin/python3.9', '-DCMAKE_BUILD_TYPE=Release', '-DEXAMPLE_VERSION_INFO=0.0.1', '-GNinja']' returned non-zero exit status 1.
  ----------------------------------------
ERROR: Failed building wheel for cmake-example
Failed to build cmake-example
ERROR: Could not build wheels for cmake-example, which is required to install pyproject.toml-based projects

Bindings for a shared library

If I am wrapping a shared library (e.g. libParent.so), and generate python bindings (e.g. libBindings.so), setup.py will install both libBindings.so (correctly) and libParent.so (incorrectly) to python's .../dist-packages/. .../dist-packages/ directory is not usually in $LD_LIBRARY_PATH, so the loader does not see libParent.so and I get an error like this:

ImportError: libParent.so.0.0.1: cannot open shared object file: No such file or directory

Contents of Bindings/CMakeLists.txtlook like this:

pybind11_add_module(Bindings bindings.cpp)
target_link_libraries(Bindings PRIVATE Parent)

Is there an elegant way to solve this?

Move this repository to the 'pybind' organization?

Hi Dean,

would you be open to moving this repository to the 'pybind11' organization? (similar to the 'pbtest' pip example which is already there). If so, please go ahead and initiate a transfer, and I'll also add you to the organization.

Thanks,
Wenzel

How to properly include CUDA?

So with the example here I got a basic extension working. After that I figured I'd try extending it to the rest of my project. The problem I am having is that a few of my source files are using CUDA code which, at the moment, is giving me unresolved external symbol errors.

I'll outline an example of my code files and the CMakeLists.txt I have at the moment:

The bindings I have in module.cpp:

#include "pch.h"

namespace py = pybind11;

void add_external_bindings(py::module_ &);

PYBIND11_MODULE(project_bindings, m) {
    add_external_bindings(m);
}

The add_external_bindings function is defined in another file (main.cpp) that uses some CUDA calls:

#include "pch.h"

// =====
// Some code that uses CUDA
// =====

namespace py = pybind11;

void add_external_bindings( py::module_& m ) {
	py::class_<ExternalClass>( m, "ExternalClass" )
		.def( py::init<int, int, int, const std::string&>() );
}

and finally my CMakeLists.txt (Apologies in advance if it strays from industry standards or conventions, I am unfortunately not very familiar with cmake):

cmake_minimum_required(VERSION 3.18)
project(project_bindings)

set(SOURCE_FILES
    "FFT-Fluid/src/module.cpp"
    "FFT-Fluid/src/stokes.cpp"
    "FFT-Fluid/src/kernels.cu"
)

add_subdirectory(pybind11 REQUIRED)
pybind11_add_module(project_bindings SHARED ${SOURCE_FILES})

set_target_properties(project_bindings PROPERTIES CXX_STANDARD 17)

# EXAMPLE_VERSION_INFO is defined by setup.py and passed into the C++ code as a
# define (VERSION_INFO) here.
target_compile_definitions(project_bindings PRIVATE VERSION_INFO=${EXAMPLE_VERSION_INFO})

find_package(CUDA REQUIRED)
target_include_directories(project_bindings PRIVATE 
    # =====
    # Some external libraries
    # =====
    ${CUDA_INCLUDE_DIRS}
)

I thought that by using target_include_directories the CUDA dependency would be taken care of but it is evidently not the case as I get the following errors for this and several other CUDA functions:

error LNK2001: unresolved external symbol cudaMallocArray

Does anyone know how to properly have CMake detect/link CUDA files?

Keep cmake_example and python_example in sync as much as possible

I think that it would be beneficial to keep the two projects in sync as much as possible (directory structure, conda recipe). I imagine that if someone solves an issue for one, it will apply to the other if it is not cmake of distutils.compiler - specific.

I don't have a strong opinion of these matters (except that we should probably rename python_example/py to python_example/src like in cmake_example).

`version` in `setup.py` is not working, need to set it inside `main.cpp`

I find the version set in setup.py is not working, instead I need to specify the version inside main.cpp, is it desired behaviour?

How to cmake manually.

I want to cmake it manually. From this video https://www.youtube.com/watch?v=H2wOlriHGmM.
The following are successes.

mkdir build 
cd build
cmake ..
make mymath

Scanning dependencies of target mymath
[ 50%] Building CXX object CMakeFiles/mymath.dir/src/mymath.cpp.o
[100%] Linking CXX static library libmymath.a
[100%] Built target mymath

make cmake_example

[ 50%] Built target mymath
Scanning dependencies of target cmake_example
[ 75%] Building CXX object CMakeFiles/cmake_example.dir/src/binder.cpp.o
[100%] Linking CXX shared module cmake_example.cpython-38-x86_64-linux-gnu.so
[100%] Built target cmake_example

And I don't know how to use setup.py
I tried python3 setup.py cmake_example
But the output is :
usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
or: setup.py --help [cmd1 cmd2 ...]
or: setup.py --help-commands
or: setup.py cmd --help

error: invalid command 'cmake_example'
What is the cmd1 means?

CMAKE_ARGS for building for conda-forge

I noticed an addition for cross-compilation on macOS here ce0ea77 by @henryiii . In trying to make my feedstock work (conda-forge/gmattensor-feedstock#13) I also got across the suggestion to pass the environment variable CMAKE_ARGS here. Does anyone know if that is really needed? And if so, it might not be so bad to add it to the example.

Cannot install this example from pypi test

I'm trying to publish my pybind11 stuff to pypi. I figured I would test out the output for this project. When I run the instructions from pypi test for this project, I get an error telling me that no distribution is found

:: pip install -i https://test.pypi.org/simple/ cmake-example                                          
Looking in indexes: https://test.pypi.org/simple/
ERROR: Could not find a version that satisfies the requirement cmake-example (from versions: none)
ERROR: No matching distribution found for cmake-example

Updating pybind and ImportError: dynamic module

my code uses a very old version of pybind: 2.6.0 and everything works fine.
I have two modules, liba and libb

With 2.6.0 I have:

>>> import liba
>>> import libb
>>>

Same code on 2.7.1 and higher, and I get the following error.
I didn't change one single line in the code.
Importing liba still works, but libb fails.

>>> import liba
>>> import libb
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dynamic module does not define module export function (PyInit_libb)

My module is correctly defined in a cpp file.

PYBIND11_MODULE(libb, m)

My CMake looks like this:

if (BUILD_SHARED_LIBRARY)
    set(TARGET_LINK_LIBS liba-shared Eigen3::Eigen)
    target_link_libraries(objlib PUBLIC ${TARGET_LINK_LIBS})
    find_package(Python REQUIRED COMPONENTS Interpreter Development)
    include_directories("${Python_INCLUDE_DIRS}")

    add_library(objlib-py OBJECT src/python/libb.cpp)
    SET(TARGET_LINK_LIBS_PY Python::Module pybind11::pybind11 ${TARGET_LINK_LIBS})
    target_include_directories(objlib-py PUBLIC ${TARGET_INCLUDE_DIRS})
    target_link_libraries(objlib-py PUBLIC ${TARGET_LINK_LIBS_PY})
    set_property(TARGET objlib-py PROPERTY POSITION_INDEPENDENT_CODE ON)

    set(SHARED_LIB ${CMAKE_PROJECT_NAME})
    add_library(${SHARED_LIB} SHARED $<TARGET_OBJECTS:objlib> $<TARGET_OBJECTS:objlib-py>)
    target_compile_definitions(${SHARED_LIB} PRIVATE VERSION_INFO=${PROJECT_VERSION})
    target_include_directories(${SHARED_LIB} PUBLIC ${TARGET_INCLUDE_DIRS})
    target_link_libraries(${SHARED_LIB} PUBLIC ${TARGET_LINK_LIBS_PY})
    list(APPEND RISK_TARGETS ${SHARED_LIB})
endif (BUILD_SHARED_LIBRARY)

And my environment:

$ python3 --version
Python 3.9.2

$ python3
Python 3.9.2 (default, Feb 28 2021, 17:03:44) 
[GCC 10.2.1 20210110] on linux

I compile my libs with gcc12

I am puzzled why upgrading the version of pybind makes my imports fail. Maybe I am doing something wrong, but I can't pinpoint it.

Python config failure from FindPythonLibsNew.cmake

Hi,

I know that this question/issue might be hard to figure out, and I'm not sure that it's even an issue with this cmake_example, but I'm kind of desperate and I thought that maybe I was missing something.

I used this repo as a skeleton for my package pyvinecopulib and everything worked well if I use a "vanilla" conda environment.

In other words, if I just install miniconda and use the base environment, do a git clone --recursive and then a pip install, it works.

However, I have another conda environment with the following config:

# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                        main  
attrs                     19.1.0                   py37_1  
backcall                  0.1.0                    py37_0  
bleach                    3.1.0                    py37_0  
ca-certificates           2019.6.16            hecc5488_0    conda-forge
certifi                   2019.6.16                py37_1    conda-forge
dbus                      1.13.6               h746ee38_0  
decorator                 4.4.0                    py37_1  
defusedxml                0.6.0                      py_0  
entrypoints               0.3                      py37_0  
expat                     2.2.6                he6710b0_0  
fontconfig                2.13.0               h9420a91_0  
freetype                  2.9.1                h8a8886c_1  
glib                      2.56.2               hd408876_0  
gmp                       6.1.2                h6c8ec71_1  
greenlet                  0.4.15           py37h516909a_0    conda-forge
gst-plugins-base          1.14.0               hbbd80ab_1  
gstreamer                 1.14.0               hb453b48_1  
icu                       58.2                 h9c2bf20_1  
ipykernel                 5.1.1            py37h39e3cac_0  
ipython                   7.7.0            py37h39e3cac_0  
ipython_genutils          0.2.0                    py37_0  
ipywidgets                7.5.1                      py_0  
jedi                      0.13.3                   py37_0  
jinja2                    2.10.1                   py37_0  
jpeg                      9b                   h024ee3a_2  
jsonschema                3.0.1                    py37_0  
jupyter                   1.0.0                    py37_7  
jupyter_client            5.3.1                      py_0  
jupyter_console           6.0.0                    py37_0  
jupyter_core              4.5.0                      py_0  
jupyter_qtconsole_colorschemes 0.8.1                      py_1    conda-forge
libedit                   3.1.20181209         hc058e9b_0  
libffi                    3.2.1                hd88cf55_4  
libgcc-ng                 9.1.0                hdf63c60_0  
libpng                    1.6.37               hbc83047_0  
libsodium                 1.0.16               h1bed415_0  
libstdcxx-ng              9.1.0                hdf63c60_0  
libuuid                   1.0.3                h1bed415_2  
libxcb                    1.13                 h1bed415_1  
libxml2                   2.9.9                hea5a465_1  
markupsafe                1.1.1            py37h7b6447c_0  
mistune                   0.8.4            py37h7b6447c_0  
msgpack-python            0.6.1            py37h6bb024c_0    conda-forge
nbconvert                 5.5.0                      py_0  
nbformat                  4.4.0                    py37_0  
ncurses                   6.1                  he6710b0_1  
notebook                  6.0.0                    py37_0  
notedown                  1.5.1                      py_0    conda-forge
numpy                     1.17.0                   pypi_0    pypi
openssl                   1.1.1c               h516909a_0    conda-forge
pandoc                    2.2.3.2                       0  
pandoc-attributes         0.1.7                      py_1    conda-forge
pandocfilters             1.4.2                    py37_1  
parso                     0.5.0                      py_0  
pcre                      8.43                 he6710b0_0  
pexpect                   4.7.0                    py37_0  
pickleshare               0.7.5                    py37_0  
pip                       19.1.1                   py37_0  
prometheus_client         0.7.1                      py_0  
prompt_toolkit            2.0.9                    py37_0  
ptyprocess                0.6.0                    py37_0  
pygments                  2.4.2                      py_0  
pynvim                    0.3.2                    py37_0    conda-forge
pyqt                      5.9.2            py37h05f1152_2  
pyrsistent                0.14.11          py37h7b6447c_0  
python                    3.7.4                h265db76_0  
python-dateutil           2.8.0                    py37_0  
pyzmq                     18.0.0           py37he6710b0_0  
qt                        5.9.7                h5867ecd_1  
qtconsole                 4.5.2                      py_0  
readline                  7.0                  h7b6447c_5  
send2trash                1.5.0                    py37_0  
setuptools                41.0.1                   py37_0  
sip                       4.19.8           py37hf484d3e_0  
six                       1.12.0                   py37_0  
sqlite                    3.29.0               h7b6447c_0  
terminado                 0.8.2                    py37_0  
testpath                  0.4.2                    py37_0  
tk                        8.6.8                hbc83047_0  
tornado                   6.0.3            py37h7b6447c_0  
traitlets                 4.3.2                    py37_0  
unidecode                 1.0.23                   py37_0  
wcwidth                   0.1.7                    py37_0  
webencodings              0.5.1                    py37_1  
wheel                     0.33.4                   py37_0  
widgetsnbextension        3.5.0                    py37_0  
xz                        5.2.4                h14c3975_4  
zeromq                    4.3.1                he6710b0_3  
zlib                      1.2.11               h7b6447c_3

which can be replicated using the following explicit spec file on linux:

# This file may be used to create an environment using:
# $ conda create --name <env> --file <this file>
# platform: linux-64
@EXPLICIT
https://repo.anaconda.com/pkgs/main/linux-64/_libgcc_mutex-0.1-main.conda
https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2019.6.16-hecc5488_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/gmp-6.1.2-h6c8ec71_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/icu-58.2-h9c2bf20_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/jpeg-9b-h024ee3a_2.conda
https://repo.anaconda.com/pkgs/main/linux-64/libstdcxx-ng-9.1.0-hdf63c60_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/libgcc-ng-9.1.0-hdf63c60_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/expat-2.2.6-he6710b0_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/libffi-3.2.1-hd88cf55_4.conda
https://repo.anaconda.com/pkgs/main/linux-64/libsodium-1.0.16-h1bed415_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/libuuid-1.0.3-h1bed415_2.conda
https://repo.anaconda.com/pkgs/main/linux-64/libxcb-1.13-h1bed415_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/ncurses-6.1-he6710b0_1.conda
https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1c-h516909a_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/pcre-8.43-he6710b0_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/xz-5.2.4-h14c3975_4.conda
https://repo.anaconda.com/pkgs/main/linux-64/zlib-1.2.11-h7b6447c_3.conda
https://repo.anaconda.com/pkgs/main/linux-64/glib-2.56.2-hd408876_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/libedit-3.1.20181209-hc058e9b_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/libpng-1.6.37-hbc83047_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/libxml2-2.9.9-hea5a465_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/pandoc-2.2.3.2-0.conda
https://repo.anaconda.com/pkgs/main/linux-64/readline-7.0-h7b6447c_5.conda
https://repo.anaconda.com/pkgs/main/linux-64/tk-8.6.8-hbc83047_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/zeromq-4.3.1-he6710b0_3.conda
https://repo.anaconda.com/pkgs/main/linux-64/dbus-1.13.6-h746ee38_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/freetype-2.9.1-h8a8886c_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/gstreamer-1.14.0-hb453b48_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/sqlite-3.29.0-h7b6447c_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/fontconfig-2.13.0-h9420a91_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/gst-plugins-base-1.14.0-hbbd80ab_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/python-3.7.4-h265db76_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/attrs-19.1.0-py37_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/backcall-0.1.0-py37_0.conda
https://conda.anaconda.org/conda-forge/linux-64/certifi-2019.6.16-py37_1.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/decorator-4.4.0-py37_1.conda
https://repo.anaconda.com/pkgs/main/noarch/defusedxml-0.6.0-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/entrypoints-0.3-py37_0.conda
https://conda.anaconda.org/conda-forge/linux-64/greenlet-0.4.15-py37h516909a_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/ipython_genutils-0.2.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/markupsafe-1.1.1-py37h7b6447c_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/mistune-0.8.4-py37h7b6447c_0.conda
https://conda.anaconda.org/conda-forge/linux-64/msgpack-python-0.6.1-py37h6bb024c_0.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/pandoc-attributes-0.1.7-py_1.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/pandocfilters-1.4.2-py37_1.conda
https://repo.anaconda.com/pkgs/main/noarch/parso-0.5.0-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/pickleshare-0.7.5-py37_0.conda
https://repo.anaconda.com/pkgs/main/noarch/prometheus_client-0.7.1-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/ptyprocess-0.6.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/pyzmq-18.0.0-py37he6710b0_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/qt-5.9.7-h5867ecd_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/send2trash-1.5.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/sip-4.19.8-py37hf484d3e_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/six-1.12.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/testpath-0.4.2-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/tornado-6.0.3-py37h7b6447c_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/unidecode-1.0.23-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/wcwidth-0.1.7-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/webencodings-0.5.1-py37_1.conda
https://repo.anaconda.com/pkgs/main/linux-64/jedi-0.13.3-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/pexpect-4.7.0-py37_0.conda
https://conda.anaconda.org/conda-forge/linux-64/pynvim-0.3.2-py37_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/pyqt-5.9.2-py37h05f1152_2.conda
https://repo.anaconda.com/pkgs/main/linux-64/pyrsistent-0.14.11-py37h7b6447c_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/python-dateutil-2.8.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/setuptools-41.0.1-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/terminado-0.8.2-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/traitlets-4.3.2-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/bleach-3.1.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/jinja2-2.10.1-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/jsonschema-3.0.1-py37_0.conda
https://repo.anaconda.com/pkgs/main/noarch/jupyter_core-4.5.0-py_0.tar.bz2
https://conda.anaconda.org/conda-forge/noarch/jupyter_qtconsole_colorschemes-0.8.1-py_1.tar.bz2
https://repo.anaconda.com/pkgs/main/noarch/pygments-2.4.2-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/wheel-0.33.4-py37_0.conda
https://repo.anaconda.com/pkgs/main/noarch/jupyter_client-5.3.1-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/nbformat-4.4.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/pip-19.1.1-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/prompt_toolkit-2.0.9-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/ipython-7.7.0-py37h39e3cac_0.tar.bz2
https://repo.anaconda.com/pkgs/main/noarch/nbconvert-5.5.0-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/ipykernel-5.1.1-py37h39e3cac_0.conda
https://conda.anaconda.org/conda-forge/noarch/notedown-1.5.1-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/jupyter_console-6.0.0-py37_0.conda
https://repo.anaconda.com/pkgs/main/linux-64/notebook-6.0.0-py37_0.tar.bz2
https://repo.anaconda.com/pkgs/main/noarch/qtconsole-4.5.2-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/widgetsnbextension-3.5.0-py37_0.tar.bz2
https://repo.anaconda.com/pkgs/main/noarch/ipywidgets-7.5.1-py_0.tar.bz2
https://repo.anaconda.com/pkgs/main/linux-64/jupyter-1.0.0-py37_7.conda

Using this new conda environment, I get:

CMake Error at pybind11/tools/FindPythonLibsNew.cmake:127 (message):
    Python config failure: Python is 0-bit, chosen compiler is 64-bit

I tried to understand what was going on by adding message(STATUS "PYTHON_VALUES = \n ${_PYTHON_VALUES}") at line 94, and I get:

-- PYTHON_VALUES =
     3.7.4.final.0
    /home/tvatter/miniconda/envs/vim
    /home/tvatter/miniconda/envs/vim/include/python3.7m
    /home/tvatter/miniconda/envs/vim/lib/python3.7/site-packages
    7.4.0
    .cpython-@PYVERNODOTS@m-x86_64-linux-gnu.so
    0
    8
    3.7m
    /home/tvatter/miniconda/envs/vim/lib
    x86_64-linux-gnu

So the culprit appears to be:

 >>> print(s.get_config_var('SO'));
7.4.0
.cpython-@PYVERNODOTS@m-x86_64-linux-gnu.so

In the base environment, we obviously get:

 >>> print(s.get_config_var('SO'));
.cpython-@PYVERNODOTS@m-x86_64-linux-gnu.so

... any idea what I could/should do?

How can I make this work with cmake alone?

I want to deploy an example python library, so someone can just include a folder and start using the API

I ran the following commands:

mkdir build; cd build
cmake ..; make

This generated a cmake_example.so

How can I now start using that with python?

How to build an executable while installing in normal and editable mode

Hello, I'm currently learning how to use CMake and pybind11 with this project. As part of the installation process, I need to build and install a C++ source file. To ensure that everything is clear, I've included the reproduction code below.

Description

My project structure: It's basically the same except there is my cpp source file helloworld.cpp in src/ folder.

$ tree -L 2
.
├── CMakeLists.txt
├── pybind11
├── pyproject.toml
├── setup.py
└── src
    ├── helloworld.cpp
    └── main.cpp

src/helloworld.cpp: A trivial helloworld program. $ cat src/helloworld.cpp

#include <iostream>

int main(int argc, char **argv) {
  std::cout << "Hello World!!!\n";
  return 0;
}

CMakeLists.txt: It's basically the same as CMakeLists.tx except add_executable(helloworld src/helloworld.cpp) is added to build executable.

$ cat CMakeLists.txt 
cmake_minimum_required(VERSION 3.22)
project(cmake_example)

add_executable(helloworld src/helloworld.cpp)

add_subdirectory(pybind11)
pybind11_add_module(cmake_example src/main.cpp)

target_compile_definitions(cmake_example
                           PRIVATE VERSION_INFO=${EXAMPLE_VERSION_INFO})

pyproject.toml:

$ cat pyproject.toml 
[build-system]
requires = ["setuptools>=62.0.0", "wheel", "cmake>=3.22"]
build-backend = "setuptools.build_meta"

pybind11 is a git submodule, and setup.py is exactly the same as this setup.py.

Build in normal mode.

Create virtual env and update pip: python3 -m venv venv && source venv/bin/activate && python3 -m pip install --upgrade pip
Install in normal mode: python3 -m pip install .
cmake_example library is installed correctly but my helloworld program is not. There is no helloworld program in venv.

$ ls venv/lib/python3.8/site-packages/
cmake_example-0.0.1.dist-info             
cmake_example.cpython-38-x86_64-linux-gnu.so

Build in editable mode.

Create virtual env and update pip: python3 -m venv venv && source venv/bin/activate && python3 -m pip install --upgrade pip
Install in editable mode: python3 -m pip install -e .
cmake_example library is also installed correctly but my helloworld program is not. There is no helloworld program created in the current folder.

$ ls
cmake_example.cpython-38-x86_64-linux-gnu.so  cmake_example.egg-info  CMakeLists.txt  pybind11  pyproject.toml  setup.py  src  venv

My experiment:

I actually tried to make it work by modifying setup.py with the following way.

Add code snippet in setup.py in Line:47.

        bindir = extdir / "bin"
        print(f"User's executables resides in {bindir}")
        cmake_args = [
            # My innovation. helloworld can be called in scripts.
            f"-DCMAKE_RUNTIME_OUTPUT_DIRECTORY={bindir}{os.sep}",
            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}{os.sep}",
            f"-DPYTHON_EXECUTABLE={sys.executable}",
            f"-DCMAKE_BUILD_TYPE={cfg}",  # not used on MSVC, but no harm
        ]

This approach kind of work. Now I can do pip install . and helloworld program appears in venv/lib/python3.8/site-packages/bin/helloworld. However, this approach doesn't work in editable model. I.e., I do pip install -e ., but helloworld program is no created anywhere in the project.

My question is how to achieve the following goal: I would like the helloworld program to be created automatically when I run pip install . and pip install -e ., and I want this program to be installed in the correct Python root path in both modes. Do you have any suggestions or advice on how I can make this happen? Thank you for your help!

System info:
OS: ubuntu20.04
Python: Python3.8

Can not execute test.py in test file

Anyone has issue with test.py? When I execute the file, the console tells me that the No module named 'cmake_example'. Any one knows how to deal with this problem?

Traceback (most recent call last):
File "/Users/jiaqimo/cmake_example/tests/test.py", line 1, in
import cmake_example as m
ModuleNotFoundError: No module named 'cmake_example'

Using pybind not as add_subdirectory...

Hey

So I have a little complex library here and I need to be "in control" of what goes where/how...
Here is my RnD test that "builds" but fails to work/import in python... would any1 be able to look in to it ?

cmake_minimum_required(VERSION 3.25)
project(exampleHowToPybind)

#add_compile_options(/Zi /MDd /Od)
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi /Od")
#set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /DEBUG")

set(PY_BIND_ROOT "S:/01_Code//pybind11/include")
set(PY_VERSION 37)
set(PY_EXE "C:/Program Files/Python37")
set(Python3_ROOT_DIR "C:/Program Files/Python37")
set(Python_INCLUDE_DIRS "${Python3_ROOT_DIR}/include")
set(Python3_FIND_ABI "ON" "3" "7")
set(PYTHON_EXECUTABLE "${Python3_ROOT_DIR}/python.exe" CACHE FILEPATH "Path to the Python executable")


set(PY_BUILD_DEB)
if (${CMAKE_BUILD_TYPE} MATCHES Debug)
    message("WERE IN DEBUG MODE")
    set(PY_BUILD_DEB "_d")
endif ()
set(_PYTHON_EXECUTABLE "${PY_EXE}/python.exe" CACHE STRING "Path to the Python executable")
set(_PYTHON_INCLUDE_DIR "${PY_EXE}/include" CACHE STRING "Path to the Python include directory")
set(_PYTHON_LIBRARY "${PY_EXE}/libs/python${PY_VERSION}${PY_BUILD_DEB}.lib" CACHE STRING "Path to the Python library")


set(OLD_PATH ${CMAKE_PREFIX_PATH})
set(CMAKE_PREFIX_PATH ${PY_EXE})
#find_package(Python3 REQUIRED COMPONENTS Interpreter Development)# HINTS "${PYTHON_EXECUTABLE}")

#set(CMAKE_PREFIX_PATH ${PY_BIND_ROOT}/tools)
#find_package(pybind11)

set(CMAKE_PREFIX_PATH ${OLD_PATH})

message("  PYTHON_EXECUTABLE : ${_PYTHON_EXECUTABLE}")
message(" PYTHON_INCLUDE_DIR : ${_PYTHON_INCLUDE_DIR}")
message("     PYTHON_LIBRARY : ${_PYTHON_LIBRARY}")
message("   Python_LIBRARIES : ${Python_LIBRARIES}")
message("Python_INCLUDE_DIRS : ${Python_INCLUDE_DIRS}")

# include("${PY_BIND_ROOT}/CMakeLists.txt")

add_library(pybind11 INTERFACE)
target_include_directories(pybind11 INTERFACE ${PY_BIND_ROOT})


set(SRC main.cpp)

#add_executable(${PROJECT_NAME} ${SRC})
add_library(${PROJECT_NAME} MODULE ${SRC})

set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".pyd" )


target_link_libraries(${PROJECT_NAME} PRIVATE pybind11 ${PYTHON_LIBRARY} "${PY_EXE}/libs/python${PY_VERSION}.lib")
target_include_directories(${PROJECT_NAME} PRIVATE ${Python_INCLUDE_DIRS})

Now my current problem is that I can't use find_package. It works fine in Clion, but in visual studio 2022 it returns python 310 instead of 37 that I specified. No matter what I try he's ignoring my requests. In any case, I've decided to ignore that find package and link by hand....

Can any1 help out ?
@dean0x7d @henryiii

Build fails with pybind11 2.7

I updated the pybind11 module, yielding pybind11 2.7.1.dev1. But the build fails now, with lots of errors of this kind:

CMake Error in pybind11/CMakeLists.txt:
  IMPORTED_LOCATION not set for imported target "pybind11::python_headers"
  configuration "RelWithDebInfo".

They were also present in 2.6, but the build still worked, now it doesn't.

Windows, cmake version 3.19.0-rc2

How to specify python?

Hello

Thanks for this awesome test!
I'm lost with customization tho...
How can I specify python in CMakeList.txt file?
I build this file without using your python. setup routine tho... just added

add_definitions(-DVERSION_INFO=3.10)

To cmake and it build locally.
Works great, locally, but I Have no idea how it knows which python to use.

I want to be explicit.
Any ideas?
Pinging our 2 biggest contributors hoping for a miracle :- )
@dean0x7d @henryiii

SOLVED>
To specify python version using "new methods"

set(PYBIND11_PYTHON_VERSION 3.9)
set(OLD_PATH ${CMAKE_PREFIX_PATH})
set(CMAKE_PREFIX_PATH ${P3_ROOT_DIR})
add_subdirectory(S:/pybind11 S:/pybind11)
set(CMAKE_PREFIX_PATH ${OLD_PATH})

at least on windows before adding pybind11
big thanks to @henryiii !!

Where is the ./cmake_example

When I git clone the cmake_example, I do not find ./cmake_example file. And I mkdir build and cmake .. & make, still did not find ./cmake_example. In addition, I run python setup.py install, it still not work. any help?