c++ - 为什么我在编译 hello world c++ 文件时得到 "does not name a type"

Question

在我的笔记本电脑上更新我的 Arch Linux 系统后，我在尝试编译我正在处理的项目时遇到了很多编译错误。相同的代码在其他机器上编译良好。

所以，我尝试了一个小 hello world 程序，但它失败并出现相同的错误。

我花了相当长的时间试图弄清楚发生了什么，但我一无所获，所以我非常感谢任何提示。

我尝试编译的文件非常简单:

#include <iostream>

int main ()
{
    std::cout << "Hello, world!\n";
    return 0;
}

我这样编译:

 $ g++ -Wall -Wfatal-errors hello.cpp -o hello

并出现以下错误:

In file included from /usr/include/c++/8.2.1/memory:74,
             from /usr/local/include/format.h:36,
             from /usr/local/include/time.h:11,
             from /usr/include/pthread.h:24,
             from /usr/include/c++/8.2.1/x86_64-pc-linux-gnu/bits/gthr-default.h:35,
             from /usr/include/c++/8.2.1/x86_64-pc-linux-gnu/bits/gthr.h:148,
             from /usr/include/c++/8.2.1/ext/atomicity.h:35,
             from /usr/include/c++/8.2.1/bits/ios_base.h:39,
             from /usr/include/c++/8.2.1/ios:42,
             from /usr/include/c++/8.2.1/ostream:38,
             from /usr/include/c++/8.2.1/iostream:39,
             from hello.cpp:4:
/usr/include/c++/8.2.1/ext/concurrence.h:124:5: error: 
'__gthread_mutex_t' does not name a type; did you mean 
'__pthread_mutex_s'?
 __gthread_mutex_t _M_mutex;
 ^~~~~~~~~~~~~~~~~
 __pthread_mutex_s
compilation terminated due to -Wfatal-errors

如果我删除 -Wfatal-errors 开关，我只会收到更多错误。

Answer 1

正是/usr/local/include 中的两个头文件，即 format.h 和 time.h 导致了我的问题。删除它们后，我现在可以再次编译我的项目。