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POWrapping C++ using ctypes: undefined symbol
 

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    <p>I am experimenting with wrapping C++ in order to use C++ functions in Python. Currently I am trying out ctypes and unfortunately, I have not yet been successful. For starters I have written a Hello World program in C++ and I am trying to call it from Python using ctypes. This is what I have done:</p> <pre><code>path_to_dir $ vim helloworld.cpp 1: #include &lt;iostream&gt; 2: 3: using namespace std; 4: 5: int main() 6: { 7: cout &lt;&lt; "Hello, world!" &lt;&lt; endl; 8: return 0; 9: } path_to_dir $ gcc -shared -Wl,-soname,hello_module -o hello_module.so -fPIC helloworld.cpp path_to_dir $ vim helloworld.py 1: import ctypes 2: 3: libc = ctypes.cdll.LoadLibrary("path_to_dir/hello_module.so") 4: 5: libc.main() path_to_dir $ python helloworld.py Traceback (most recent call last): File "helloworld.py", line 3, in &lt;module&gt; libc = ctypes.cdll.LoadLibrary("/home/carlos/Workspace/Freestyle/Wrapping_C++/ctypes/hello_module.so") File "/usr/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary return self._dlltype(name) File "/usr/lib/python2.7/ctypes/__init__.py", line 365, in __init__ self._handle = _dlopen(self._name, mode) OSError: /home/carlos/Workspace/Freestyle/Wrapping_C++/ctypes/hello_module.so: undefined symbol: _ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_ </code></pre> <p>The traceback mentions something about an undefined symbol however I do not know why I get this error and how to solve it. I also tried standard C++ libraries instead of writing one like this on my own. That worked out fine. Can someone help?</p>
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