ImportError: [library_name] .so: undefined symbol: [function name]

Question

I am expanding my Python program with the C module, which uses the GstPhotography interface for GStreamer. My C module compiles fine, but when I try to run it from Python, I get this error:

$python Program.py Traceback (most recent call last): File "Program.py", line 10, in <module> import MyPythonClass File "/path/MyPythonClass.py", line 19, in <module> import my_c_module ImportError: /path/my_c_module.so: undefined symbol: gst_photography_get_type 

I'm not sure what this means, because I never use gst_photography_get_type in my_c_module.cpp - this is a function implemented in the GstPhotography source code.

Answer 1

This means that you did not link to enough libraries because it was not specified in the pkgconfig file, or you did not refer to the pkgconfig file at all.