#include stdio.hinline int getX(int x)
{return x + (int)x;
}int main()
{printf("%d", getX((int)main));
}The code is very simple, gcc does not open optimization link error. undefined reference to `getX
General IO Function Description GPIO Ports The24 GPIO pins can be divided into three groups of ports: PA, PB, and PC. The GPIOs in each group of ports are numbered 0-7 according to their bits in the G