題在使用 Armadillo 的 C++ 中創建 Python 擴展時，出現以下錯誤：A) 在 Mac OS Mojave 10.14.4、Python 3.7.5 中：Traceback (most recent call last):  File "./py_program.py", line 5, in <module>    import cmoduleImportError: dlopen(/Users/angel/.pyenv/versions/3.7.5/lib/python3.7/site-packages/cmodule.cpython-37m-darwin.so, 2): Symbol not found: __ZTWN4arma23arma_rng_cxx11_instanceE  Referenced from: /Users/angel/.pyenv/versions/3.7.5/lib/python3.7/site-packages/cmodule.cpython-37m-darwin.so  Expected in: flat namespace in /Users/angel/.pyenv/versions/3.7.5/lib/python3.7/site-packages/cmodule.cpython-37m-darwin.soB) 在 Ubuntu 20、Python 3.8.2 中：Traceback (most recent call last):  File "./py_program.py", line 5, in <module>    import cmoduleImportError: /usr/local/lib/python3.8/dist-packages/cmodule.cpython-38-x86_64-linux-gnu.so: undefined symbol: _ZN4arma23arma_rng_cxx11_instanceE它們都是由于使用arma::arma_rng::randn<double>()，見下文。我該如何解決？細節我想py_program.py導入在cmodule.cpp. 按照文檔https://docs.python.org/3/extending/extending.html，我有文件py_program.py，setup.py和cmodule.cpp. 它們的內容是：py_program.py#!/usr/bin/env python3"""Import and use cmodule."""import cmodulecmodule.printvol(3.)setup.py"""To install the module defined in cmodule.cpp."""from distutils.core import setup, Extensionsetup(name='cmodule', version='1.0',  \      ext_modules=[          Extension(            'cmodule', ['cmodule.cpp'],            extra_compile_args=['-std=c++11'],            language='c++')],      )cmodule.cpp/* Module to be used in Python.   All Python stuff follows Sec. 1.8 of    https://docs.python.org/3/extending/extending.html */#define PY_SSIZE_T_CLEAN#include <Python.h>#include <armadillo>double f()// Fails at using Armadillo.// The module works if I delete this function.{    double rn_y = arma::arma_rng::randn<double>();    return rn_y;}arma::cx_double g()// Succeeds at using Armadillo.{    arma::cx_double value(0., 1.);    return value;}