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

user_511334 · Answer

Seeing that this is marked as gcc you can use the command line switch Wno-unused-parameter.

For example:

gcc -Wno-unused-parameter test.c

Of course this effects the whole file (and maybe project depending where you set the switch) but you don't have to change any code.

user_2791577 · Answer

Since C++ 17, the [[maybe_unused]] attribute can be used to suppress warnings about unused parameters.

Based on the OP's example code:

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