Question

I’m trying to compile some code that use a function implemented in a static library named staticlib.a. I also have the header named staticlib.h which contain the declaration of that function. My main, that is contained in the main.c file wich include staticlib.h, only calls that function and no else. So I compile with
gcc main.c staticlib.a
and everything work fine. I need some feature of c++ but if I properly change main.c in main.cpp and compile same way
gcc main.cpp staticlib.a
an undefined reference to my function occured. How can I make this works? And why this problem occurred? I cannot really find an explanation in any site i visited…
Thank you for all trhe answers.

Answer 1

you have to define the function in the library as a ‘C’ function, not a C++ function – do this in your main.cpp

extern "C"
{
#include "staticlib.h"
}