Building a shared object from a single .cpp
I am trying to build a shared object library from a cpp file that is a simple set of functions. I want to use ctypes to interface with python.
Say I have the cpp file:
and header file
I tried to build
Then in python
the line
yields
nm -D print.so
gives the output
What am I fundamentally doing wrong in the compilation step?
In short, you are calling a c++ function while ctypes expects C functions linkage:
In short, you are missing an extern "C" declaration right before the function declaration in the header file:
This will prevent the C++ name mangling.
Using vectors and other C++ types will likely cause you ABI issues It's a good idea to use C functions with plain C types in your functions as an interface.
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