Question

我的g ++编译器似乎有问题。它不能用＆＃34; -std = c ++ 11＆＃34;编译代码。使用g ++ 5.4.0在Ubuntu 16.04上选项。

所以我写了一个非常简单的Hello World程序：

//Hello.cpp
#include <iostream>

using namespace std;

int main(){
    cout<<"Hello World"<<endl;
}

如果我用g ++编译它：

g ++ Hello.cpp

它工作正常。

但如果我添加＆＃34; -std = c ++ 11＆＃34; ：

g ++ -std = c ++ 11 Hello.cpp

g ++给了我很多错误信息，超过1000行。

以下是其中一些：

In file included from /usr/include/c++/5/bits/stl_pair.h:59:0,
             from /usr/include/c++/5/bits/stl_algobase.h:64,
             from /usr/include/c++/5/bits/char_traits.h:39,
             from /usr/include/c++/5/ios:40,
             from /usr/include/c++/5/ostream:38,
             from /usr/include/c++/5/iostream:39,
             from Hello.cpp:1:
/usr/include/c++/5/bits/move.h:76:27: error: ‘remove_reference’ in namespace ‘std’ does not name a template type
 forward(typename std::remove_reference<_Tp>::type& __t) noexcept
                       ^
/usr/include/c++/5/bits/move.h:76:43: error: expected ‘,’ or ‘...’ before ‘<’ token
 forward(typename std::remove_reference<_Tp>::type& __t) noexcept
                                       ^
/usr/include/c++/5/bits/move.h: In function ‘constexpr _Tp&& std::forward(int)’:
/usr/include/c++/5/bits/move.h:77:33: error: ‘__t’ was not declared in this scope
 { return static_cast<_Tp&&>(__t); }
                             ^

相同的代码在其他计算机上运行良好。

你有什么想法吗？

上面的

错误信息不是第一行，第一行是：

In file included from 
/usr/include/c++/5/experimental/type_traits:39:0,
             from /usr/include/c++/5/bits/move.h:57,
             from /usr/include/c++/5/bits/stl_pair.h:59,
             from /usr/include/c++/5/bits/stl_algobase.h:64,
             from /usr/include/c++/5/bits/char_traits.h:39,
             from /usr/include/c++/5/ios:40,
             from /usr/include/c++/5/ostream:38,
             from /usr/include/c++/5/iostream:39,
             from Hello.cc:1:
/usr/include/c++/5/bits/c++14_warning.h:32:2: error: #error This file requires compiler and library support for the forthcoming ISO C++ 2014 standard. 
This support is currently experimental, and must be enabled with the -std=c++1y or -std=gnu++1y compiler options.

但即使是＆＃34; -std = c ++ 1y＆＃34;或＆＃34; -std = gnu ++ 1y＆＃34; ，g ++仍然给我一些错误信息。

libstdc ++ 6安装在我的系统上，这不是我的第一个cpp程序＆＃34; -std = c ++ 11＆＃34;在这台电脑上（以前工作正常）。

我不记得我修改了什么，但我会尝试重新安装我的工具链。

谢谢！

Answer 1

您对计算机的软件包依赖性做了一些奇怪的事情。

GCC 5需要libstdc ++ 6，但你有libstdc ++ 5（如路径所示）。

这意味着您的编译器和标准库实现不同步。

重新安装工具链。

无法使用＆＃34; -std = c ++ 11＆＃34;编译Hello World。

1 个答案: