Macro to turn off printf statements

Question

What MACRO can be used to switch off printf statements, rather than removing them all for deployment builds, I just want to switch them off, skip them, ignore them.

Answer 1

If you want to avoid the potential warning that Jonathan's answer may give you and if you don't mind an empty call to printf you could also do something like

#define printf(...) printf("")

This works because C macros are not recursive. The expanded printf("") will just be left as such.

Another variant (since you are using gcc) would be something like

inline int ignore_printf(char const*, ...) 
         __attribute__ ((format (printf, 1, 2)));
inline int ignore_printf(char const*, ...) { return 0; }

#define printf ignore_printf

and in one compilation unit

int ignore_printf(char const*, ...)