gcc compiler visibility

intresting buat diulik

class rectangle {
        int width, height;

        public:
                void set_value(int, int);
                int area();
};

void rectangle::set_value(int x, int y) 
{
        width = x;
        height = y;
}


int rectangle::area()
{
        return width * height;
}

compile pakai

• g++ -Wall -c -fPIC abc.cc
• g++ -o librec.so --shared abc.o
• nm -C librec.so

akan ada

000000000000110e T rectangle::area()
00000000000010ea T rectangle::set_value(int, int)

nah, disitu kalau di compile pakai -fvisibility=hidden ntar pas di cek pakai nm -CD librec.so

bakalan gak ada. nah ini ada kaitannya sama __attribute__ ((visibility ("hidden")))

tambahan: https://groups.google.com/g/ode-users/c/T3qiy-4dviQ