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Isn't this just a regular C++ mangles C symbols but the library exports non-mangled symbols?

Is the waveshare lib plain C, or does it use C++? If the former, you need to enclose the #includes of the waveshare's headers with extern "C" { ... }, to prevent the C++ compiler from mangling all the function names and the linker then not being able to find them in the library.

Note: this is not special or specific to ROS 2, it's always a problem when linking C with C++.

Isn't this just a regular C++ mangles C symbols but the library exports non-mangled symbols?symbols problem?

Is the waveshare lib plain C, or does it use C++? If the former, you need to enclose the #includes of the waveshare's headers with extern "C" { ... }, to prevent the C++ compiler from mangling all the function names and the linker then not being able to find them in the library.

Note: this is not special or specific to ROS 2, it's always a problem when linking C with C++.

Isn't this just a regular C++ mangles C symbols but the library exports non-mangled symbols problem?

Is the waveshare lib plain C, or does it use C++? If the former, you need to enclose the #includes of the waveshare's headers with extern "C" { ... }, to prevent the C++ compiler from mangling all the function names and the linker then not being able to find them in the library.

Note: this is not special or specific to ROS 2, it's always a problem when linking C with C++.