Hi Hyunjun Hyung,
The C library can be used by a C++ program. In fact, many OS libraries are written in C. Therefore, whenever a system call is made by a C++ program, it is actually utilizing a C library.
However, to use a C library, C linkage should be used to link the C functions. In your C++ code, declare the functions from the C library as extern "C". This instructs the C++ compiler to use C linkage for those functions, preventing name mangling and ensuring compatibility with the C library.
Ideally, the header file should include the extern "C" keyword. If the header file does not contain this keyword, update the function declarations as follows
// Shift the function declaration inside the extern "C" scope
extern "C" {
void doSomething();
}
Finally, link the library while compiling as follows,
% linking library named 'my_library.so'
g++ .. -lmy_library -L/custom_directory_path
