How can I hide “defined but not used” warnings in GCC?

Just saw this thread while searching for solutions to this problem. I post here for completeness the solution I found...

The GCC compiler flags that control unused ​​

warnings​​ include:

-Wunused-function
-Wunused-label
-Wunused-parameter
-Wunused-value
-Wunused-variable
-Wunused (=all of the above)      

Each of these has a corresponding negative form with "no-" inserted after the W which turns off the warning (in case it was turned on by -Wall, for example). Thus, in your case you should use

-Wno-unused-function      

Of course this works for the whole code, not just compile-time asserts. For function-specific behaviour, have a look at

​​

Function attributes​​.