GCC compiler warning flag for zero variadic macro arguments

Question

What is the compiler warning flag for zero variadic macro arguments in GCC (I am using GCC 5.3.0)?

The warning is triggered by code like this

// for illu         


        

Answer 1

The warning flag that is causing the issue is -Wpedantic. This is because omitting variadic arguments is illegal and it requires a diagnostic. A warning satisfies that requirement.