Undefined symbol with pybind11 and python meson

[leandro-benedet-garcia]

I don't know much about C++, but alas.

I am making a game engine and I am compiling it as a library which is compiled with meson, and then I have python bindings with pybind11.

But when I compile and install, when importing I have this error:

>>> import funenginepy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /home/leandrobg/Projects/Games/tetris_fun_way/build/cp311/funenginepy.cpython-311-x86_64-linux-gnu.so: undefined symbol: _ZN9FunEngine4Math7Vector2IfE5get_xEv

My meson build is:

project(
  'fun_engine',
  'cpp',
  version: '0.1.0',
  default_options: ['cpp_std=c++23'],
)
add_global_arguments(['-fPIC', '-Wall'], language: 'cpp')

sources = [
  'src/math/vector.cpp',
  'src/math/vector2.cpp',
]

conf_data = configuration_data()
conf_data.set('version', meson.project_version())
package_ver = conf_data.get('version')

configure_file(input: 'config.h.in', output: 'config.h', configuration: conf_data)

py_install = import('python').find_installation(pure: false)

pybind11_dep = dependency('pybind11')
# tomlplusplus = dependency('tomlplusplus')

inc = include_directories(['include', '.'])

lib = library(
  'funengine',
  sources,
  # dependencies: deps,
  version: package_ver,
  include_directories: inc,
)

py_lib = py_install.extension_module(
  'funenginepy',
  sources + [
    'python_module/vector2.cpp',
  ],
  install: true,
  link_with: lib,
  dependencies: [pybind11_dep],
  include_directories: inc,
)

import('pkgconfig').generate(
  libraries: lib,
  version: '0.1.0',
  name: 'libfunengine',
  description: 'A game engine',
)

My bindings currently are:
https://github.com/leandro-benedet-garcia/funengine/blob/master/python_module/vector2.cpp

[leandro-benedet-garcia]

I figured the issue, I was being a dumb dumb with the vector class, I tried making bindings with another simpler class and it worked fine.