How can I suppress "unused parameter" warnings in C?

Question

For instance:

Bool NullFunc(const struct timespec *when, const char *who) {    return TRUE; } 

In C++ I was able to put a /*...*/ comment around the parameters. But not in C of course, where it gives me the error:

error: parameter name omitted

Answer 1

I usually write a macro like this:

#define UNUSED(x) (void)(x) 

You can use this macro for all your unused parameters. (Note that this works on any compiler.)

For example:

void f(int x) {     UNUSED(x);     ... }