Don't know how to compile with bindings in separate file with setuptools

[mike-gimelfarb]

I am struggling with this simple example:

========== main.h ===========

#ifndef MAIN_H_
#define MAIN_H_

int add(int i, int j);

#endif /* MAIN_H_ */

========= main.cpp ==========

#include "main.h"

int add(int i, int j) {
	return i + j + 2;
}

============= main_py.cpp (bindings) ============

#include <pybind11/pybind11.h>

#include "main.h"

namespace py = pybind11;

PYBIND11_MODULE(python_example, m) {
	m.def("add", &main::add)
}

This compiles fine when running python setup.py develop. But, when I try import python_example then it fails with ImportError: DLL load failed while importing python_example: %1 is not a valid Win32 application. I am running this on Windows 10 with mingw64 and anaconda. Oddly, when I copy the binding to main.cpp then it works fine. I would like to split the bindings into separate files for a complex project I am working on, but nothing I've tried has worked so far.

Any help would be appreciated, thanks!

[mike-gimelfarb]

Silly mistake -- I forgot to include main_py.cpp in the setup file.