用于零可变宏参数的GCC编译器警告标志 [英] GCC compiler warning flag for zero variadic macro arguments

问题描述

GCC中零可变参数的编译器警告标志是什么（我使用GCC 5.3.0）？

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

警告是由这样的代码触发

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

，但警告不指示哪个标志用于启用/禁用警告（这通常显示在方括号 [ - Wwarning-flag-name] ）。

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]).

在clang中，它是 -Wgnu-zero-variadic-macro-arguments 。我在中找不到任何类似的内容

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.

我尝试了 -Wgnu-zero-variadic-macro-arguments

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.

推荐答案

导致问题的警告标志是 -Wpedantic 。这是因为省略可变参数是非法的，它需要诊断。警告符合该要求。

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.

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