[c] C error: undefined reference to function, but it IS defined

Add the "extern" keyword to the function definitions in point.h

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Duplicate Symbols for Architecture arm64 Multiple definition of ... linker error What is an undefined reference/unresolved external symbol error and how do I fix it? Why am I getting "undefined reference to sqrt" error even though I include math.h header? What causes the error "undefined reference to (some function)"? Undefined reference to 'vtable for xxx' C error: undefined reference to function, but it IS defined Undefined reference to sqrt (or other mathematical functions) Undefined reference to `sin` Linker error: "linker input file unused because linking not done", undefined reference to a function in that file

Examples related to undefined-reference

DSO missing from command line gcc: undefined reference to libpthread.so.0: error adding symbols: DSO missing from command line What is an undefined reference/unresolved external symbol error and how do I fix it? Undefined reference to `pow' and `floor' C error: undefined reference to function, but it IS defined Undefined Reference to Undefined reference to sqrt (or other mathematical functions) Undefined reference to `sin` C++ undefined reference to defined function