CODEWITHSUNDEEP
pythonc++cmakepybind11
shelper
shelper

Reputation: 10583

How to specify the version of python for building pybind11 module

I have setup my pybind11 for building python modules written in c++. I have python3.6, and python3.7 installed on my ubuntu system, I installed both python3.6-dev and python3.7-dev. then I setup my cmakelists.txt file for my project as following:

set(PYTHONVERSION "3.7")
# None of the lines below works 
add_definitions(-DPYBIND11_PYTHON_VERSION="${PYTHONVERSION}")
set(PYBIND11_PYTHON_VERSION ${PYTHONVERSION} CACHE STRING "")
set(PYBIND11_PYTHON_VERSION ${PYTHONVERSION}) 
find_package(Python ${PYTHONVERSION} COMPONENTS Development Interpreter)

set(TARGET proj)
pybind11_add_module(${TARGET} MODULE proj.cpp)
target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
if (Python_FOUND)
    target_include_directories(${TARGET} PUBLIC ${Python_INCLUDE_DIRS})
endif()

However, when I build the project it still generates modules for python3.6 instead of python3.7. Below is my output from cmake, I found cmake finds python3.6 first, where I didn't even call findpython.

[cmake] Not searching for unused variables given on the command line.
[cmake] -- The C compiler identification is GNU 9.3.0
[cmake] -- The CXX compiler identification is GNU 9.3.0
[cmake] -- Detecting C compiler ABI info
[cmake] -- Detecting C compiler ABI info - done
[cmake] -- Check for working C compiler: /usr/bin/gcc-9 - skipped
[cmake] -- Detecting C compile features
[cmake] -- Detecting C compile features - done
[cmake] -- Detecting CXX compiler ABI info
[cmake] -- Detecting CXX compiler ABI info - done
[cmake] -- Check for working CXX compiler: /usr/bin/g++-9 - skipped
[cmake] -- Detecting CXX compile features
[cmake] -- Detecting CXX compile features - done
[cmake] -- Conan: Adjusting output directories
[cmake] -- Conan: Using cmake global configuration
[cmake] -- Conan: Adjusting default RPATHs Conan policies
[cmake] -- Conan: Adjusting language standard
[cmake] -- Current conanbuildinfo.cmake directory: /home/mpnv38/develop/parcel_dim_pywrapper/build
[cmake] -- Conan: Compiler GCC>=5, checking major version 9
[cmake] -- Conan: Checking correct version: 9
[cmake] -- Found PythonInterp: /usr/bin/python (found version "3.6.9") 
[cmake] -- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.6m.so
[cmake] -- Performing Test HAS_CPP14_FLAG
[cmake] -- Performing Test HAS_CPP14_FLAG - Success
[cmake] -- Found Python: /usr/bin/python3.7 (found suitable version "3.7.5", minimum required is "3.7") found components: Development Interpreter Development.Module Development.Embed 
[cmake] -- Configuring done
[cmake] -- Generating done

Did I miss anything?

Upvotes: 2

Views: 10736

Answers (1)

MrAliB
MrAliB

Reputation: 839

In CMakeLists.txt add the following

set (PYTHON_EXECUTABLE "path to python executable")

Upvotes: 0

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