Printing name and value of a macro

Question

I have a C program with a lot of optimizations that can be enabled or disabled with #defines. When I run my program, I would like to know what macros have been

Answer 1

I believe what you are trying to do is not possible. If you are able to change the way your #defines work, then I suggest something like this:

#define ON 1
#define OFF 2

#define OPTIMIZE_FOO ON
#define OPTIMIZE_BAR OFF

#define SHOW_DEFINE(val)\
    if(val == ON) printf(#val" is ON\n");\
    else printf(#val" is OFF\n");