error undefined reference

[Icont.1]

Good morning when compiling a project to which I added files (.h and.cpp) returns the error of "undefined reference" on a function that is in these files. I also add that I added other files (always .c and.h) of which I called a function without having problems.

[Tesla DeLorean]

Still a bit non-specific, what's the linker actually telling you, can you see the functions in the .MAP?

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When mixing .C and .CPP​ files be aware of name mangling and linkage rules. Use use extern "C" or extern cdecl as appropriate.

[Icont.1]

thanks