#include <stdio.h>
 
#define PICK_SET_A
 
#ifdef PICK_SET_A
#define SET A
#endif
#ifdef PICK_SET_B
#define SET B
#endif
 
#define ENABLE_VAR_1_A   1
#define ENABLE_VAR_2_A   1
 
#define ENABLE_VAR_2_B   0
#define ENABLE_VAR_2_B   0
 
#define MACRO_RESOLVE__(M) M
#define MACRO_RESOLVE_(V, S) MACRO_RESOLVE__(ENABLE_VAR_ ## V ##_## S)
#define MACRO_RESOLVE(var,set) MACRO_RESOLVE_(var, set)
 
#define ENABLE_VAR_1     MACRO_RESOLVE(1, SET)
#define ENABLE_VAR_2     MACRO_RESOLVE(2, SET)
 
int main(int argc, char **argv) {
 
    fprintf(stdout, "VALUE: %d\n", ENABLE_VAR_1);
 
    return 0;
}

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