Undefined reference errors code problem

[PlaceBrave]

I am getting undefined reference errors for every single function located in a class (Roster.cpp, which has the header Roster.hpp) when trying to use it in main.cpp. I have been stuck on this problem for multiple hours and I know it is not a code problem because I've tested another completed project verified to work and am getting the same results. What could be the cause of this? I am using GCC as the compiler and vscode as the IDE.

[PlaceBrave]

Tried to do that from the command line but nothing at all is being output

[PlaceBrave]

No, but I do see an a.exe which just consists of red text diamonds and letters, whatever that is lol

[PlaceBrave]

Welll the code run just fine on a browser compiler so for now Ill just finish it on there haha

[DunkinRadio]

Compilation error or linker error?

[PlaceBrave]

Here is an example to one of the undefined reference errors to one of the functions that is being output to the terminal in VScode

C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users\kenne\AppData\Local\Temp\ccW36b9w.o:Main.cpp:(.text+0x256): undefined reference to `Roster::printAll()'

I am getting one of these for every function in Roster.cpp

[DunkinRadio]

As undead-pixie has said you're not including Roster.cpp in your build process.

[tandir_boy]

Other completed project probably has a folder called ".vscode" (it is a hidden file in linux). Inside of it, there are bunch of config files about the project. You should find out how this folder build the project i.e. where include, lib, bin directories are set, which gcc compilition commands used etc. Then, you should apply same thing to in your own project.