gistfile1.txt

#import <stdio.h>

#define UNIQUE_CONST_PTR2(X) ({ static unsigned X; &X; })
#define CAT(x,y) x##y
#define UNIQUE_CONST_PTR1(X, Y) UNIQUE_CONST_PTR2(CAT(X,Y))
#define UNIQUE_CONST_PTR(KEY) UNIQUE_CONST_PTR1(KEY, __COUNTER__)

int main(int argc, char *argv[])
{
    const void *u1 = UNIQUE_CONST_PTR(A);
    const void *u2 = UNIQUE_CONST_PTR(A);

    printf("u1 = %p\n", u1);
    printf("u2 = %p\n", u2);
    
    return 0;
}