c++ - 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 illustration purposes only:
int foo(int i) { return 0; };
#define FOO(A, ...) foo(A, ##__VA_ARGS__)
FOO(1);
      ^  warning: ISO C++11 requires at least one argument for the "..." in a variadic macro

but the warning doesn't indicate which flag is used to enable/disable the warning (this is typically shown in square brackets [-Wwarning-flag-name]).

In clang it is -Wgnu-zero-variadic-macro-arguments. I haven't been able to find anything like that in the warning documentation of gcc-5.3.0.

I've tried -Wgnu-zero-variadic-macro-arguments, -Wvarargs, -Wno-variadic-macros (thanks to @ Revolver_Ocelot) but none of these is in charge of this warning.

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.