add-cmake

pybind11 and cmake

This second example shows how to use cmake to compile the add example.

All further examples, will use cmake.

The pybind11_DIR passed to the cmake commands tells the compiler where to find the library.

This sample uses a "pre-compiled" version of pybind11. If you prefer using git submodules, please refer to the official demo project that fetches pybind11 as a git submodule: https://github.com/pybind/cmake_example.

The CMakeLists.txt file

cmake_minimum_required(VERSION 3.4)
project(maths)

set(PYBIND11_PYTHON_VERSION 3.4)

find_package(pybind11 CONFIG)

pybind11_add_module(maths
    src/maths.cpp
)

Compiling and running

$ mkdir build
$ cd build
$ cmake ..
$ make

If pybind11 is not installed in a standard path, you'll need to tell cmake where it is installed by providing pybind11_DIR :

$ cmake -Dpybind11_DIR=~/bin/pybind11/share/cmake/pybind11 ..

You will now have a file with a name similar to maths.cpython-37m-x86_64-linux-gnu.so which you can import in python3:

$ python3
>>> import maths
>>> maths.add(1, 2)
3