我的g++编译器似乎有问题。在Ubuntu 16.04上,使用g++ 5.4.0时,它无法使用“-std=c++11”选项来编译代码。
因此,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;
}
如果我使用g++编译它:
它可以正常工作。g++ Hello.cpp
但是如果我添加了“-std=c++11”:
g++会给我大量的错误信息,超过1000行。g++ -std=c++11 Hello.cpp
以下是其中的一些内容:
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); }
^
同样的代码在其他电脑上可以正常运行。
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.
即使使用了“-std=c++1y”或“-std=gnu++1y”,g++仍然给我大量的错误信息。
我的系统上安装了libstdc++6,并且这不是我在这台电脑上第一个使用“-std=c++11”的cpp程序(之前都能正常工作)。
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!
-std=gnu++11
代替-std=c++11
。 - Victor Gubinstatic_cast<_Tp&&>(__t)
表示移动语义没有起作用,即iostream头文件没有使用std::move
和std::forward
。所以我认为C++ 11模式根本无法工作,这可能是GCC的一个bug。使用-std=gnu++11
应该可以解决。 - Victor Gubin