I solved "Undefined Reference" by adding the folder in the "Source Location", which contains the files that should be compiled.
"Multiple References" can be solved by adding "-z muldefs --specs=nosys.specs" toe the Command Line Pattern in MCU C++ Linker
I solved "Undefined Reference" by adding the folder in the "Source Location", which contains the files that should be compiled.
"Multiple References" can be solved by adding "-z muldefs --specs=nosys.specs" toe the Command Line Pattern in MCU C++ Linker