Question

I am wondering why GCC is giving me this warning:

test.h: In function TestRegister:
test.h:12577: warning: cast to pointer from integer of different size

Code:

#define Address   0x1234
int TestRegister(unsigned int BaseAddress)
{
    unsigned int RegisterValue = 0;
    RegisterValue              = *((unsigned int *)(BaseAddress + Address)) ;
    if((RegisterValue & 0xffffffff) != (0x0 << 0))
    {
            return(0);
    }
    else
    {
            return(1);
    }
}

Answer 1

Probably because you’re on a 64-bit platform, where pointers are 64-bit but ints are 32-bit.

Rule-of-thumb: Don’t try to use integers to store addresses.