name mangling in MinGW , plug-in system c++

Question

I am learning plugin system in C++ on the windows by using MinGW g++ compiler. the compiler version is :

C:\SAVVY\src>g++ --version g++ (MinGW.org GCC Build-2) 9.2.0

And I downloaded the source code from here https://cplusplus.com/articles/48TbqMoL/

then I am trying to figure out the error: Exception caught: Invalid Plugin DLL: both 'getObj' and 'getName' must be defined.

probably the error line are in main.cpp 59, 60

    ObjProc objFunc = (ObjProc) GetProcAddress(mod, "_Z6getObjv");
    NameProc nameFunc = (NameProc) GetProcAddress(mod, "_Z7getNamev");

I have looked into the word "name mangling", but I can not find the solution. Would somebody, please direct me how to the solution.

Answer 1

That article might be outdated, it's more than 9 years old. The name mangling is not stable and might be change from one to another compiler version. Besides such issue has been reported by a reader 9 years ago and noticed in that article: loading dll issue. Finally that article has been updated with the solution. Go to the chapter Update - Using the plugin system across different compilers and see the solution with using extern "C".