What's the cxx11 abi error & how to fix it?

Question

Working on a project (already huge, I'm new to it) and it seems everytime I call a function which returns std::string from a different file, it causes an error :

undefined reference to ClassName::FunctionName[abi:cxx11]()

Environment :
GCC : 10.3.0
OS : Ubuntu 21.04

I did my research and there are similar questions but couldn't really fix it. Any information related to it will be appreciated.

Answer 1

Nikhil did you look at this in your research
https://github.com/facebookarchive/caffe2/issues/1980
Errors including std::__cxx11 or [abi:cxx11] or Linux with Anaconda

Answer 2

Thank you for the answers.
But sometimes errors make you think the problem is huge when it's actually pretty small and I need a hit at my head at those times :))

Problem was I forgot to add the *.cpp file while linking 🤦🏻‍♂️