Creating a C++ application with Python code included

Question

I'm trying to create a "helloworld" app in C++, with an integrated Python code. I include Python.h, and it is seen by static analyzer fine. As I build my code I get undefined reference to '_imp__Py_Initialize', so make failed

I'm running Windows7-x64 with Python3.5-x32, MinGW-x64, CLion to write code. None of guides i found show the complete step-by-step solutions. If I have to re-install some specific versions of software, I need to know - what to do...

CMakeLists.txt

cmake_minimum_required(VERSION 3.12)
project(sample)
find_package(PythonLibs 3.5 REQUIRED)
find_package(PythonInterp 3.5 REQUIRED)
include_directories(${PYTHON_INCLUDE_DIRS})
set(CMAKE_CXX_STANDARD 14)
add_executable(sample main.cpp)

main.cpp

#include <Python.h>
int main() {
  Py_Initialize();
  PyRun_SimpleString("print('hello, python')");
  Py_Finalize();
  return 0;
}

So the subject raises, i have an undefined reference. As i add target_link_libraries(${PYTHON_LIBRARIES}) to my CMakeLists.txt i get another exception:

Cannot specify link libraries for target
"C:/Users/...../Python35-32/python35.dll"
which is not built by this target.

Please provide me some more ideas, what to do with this, if you don't mind.

target_link_libraries(${PYTHON_LIBRARIES}) takes the target as first parameter. Your target is sample, so try with target_link_libraries(sample ${PYTHON_LIBRARIES}) — GPhilo
– GPhilo, Commented May 27, 2019 at 13:04
``` Cannot specify link libraries for target "sample" which is not built by this project ``` — Ivan I. Ovchinnikov
– Ivan I. Ovchinnikov, Commented May 27, 2019 at 13:07
It somehow works if i put it after. BUT WHY? can you, please post your answer as an actual answer so i can vote for it, and mark as a solution? — Ivan I. Ovchinnikov
– Ivan I. Ovchinnikov, Commented May 27, 2019 at 13:15

GPhilo · Accepted Answer · 2019-05-27 13:18:26Z

1

target_link_libraries takes the target as first parameter. From the documentation of target_link_libraries:

The named target must have been created in the current directory by a command such as add_executable() or add_library(). The remaining arguments specify library names or flags.

Your target is sample, not because of the project(sample) at the beginning, but because of add_executable(sample main.cpp), so add

`target_link_libraries(sample ${PYTHON_LIBRARIES})`

after the add_executable line.

answered May 27, 2019 at 13:18

GPhilo

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