为什么“typedef的重定义”错误与GCC 4.3但不是GCC 4.6？ [英] Why "Redefinition of typedef" error with GCC 4.3 but not GCC 4.6?

问题描述

我一直在使用GCC 4.6编译我的应用程序，但用户报告了重定义typedef错误。在一些混乱之后，我错误地告诉用户使用Git获取最新的源代码，我仔细看了一下，发现了类似这样的：

I've been developing my application using GCC 4.6 for compilation but a user reported the "redefinition of typedef" error. After some confusion where I wrongfully told the user to fetch the latest source using Git, I took a closer look and found something similar to this:

/* mystruct.h */

#ifdef MYSTRUCT_H
#define MYSTRUCT_H

typedef struct _mystruct mystruct

#endif



/* mystruct.c */
#include "mystruct.h"

typedef struct _mystruct
{
    int a;
    int b;

} mystruct;

这对于旧的GCC版本很容易修复，但为什么这不再是一个错误？

Which is quite easy to fix for the older GCC versions, but why is this no longer an error? Or does it need reporting?

推荐答案

这看起来像一个故意更改 ...

This looks like a deliberate change...

我没有4.6手，但如果您使用 -pedantic ，您会收到警告。

I don't have 4.6 to hand, but it looks like you will get the warning if you use -pedantic.

这篇关于为什么“typedef的重定义”错误与GCC 4.3但不是GCC 4.6？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！