问题描述
我已经更新了gcc版本，gcc --version会产生以下输出
I have updated version of gcc, gcc --version produces the following output
gcc (Ubuntu 8.1.0-5ubuntu1~16.04) 8.1.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
我可以在头文件中包含文件系统而没有任何错误
i can include filesystem in header file without any error
#include<filesystem>
但是当我尝试访问如下所示的名称空间文件系统时，我得到了错误消息
But when i try to access the namespace filesystem like below then i get the error
namespace fs = std::filesystem;
错误消息
error: ‘filesystem’ is not a namespace-name
namespace fs = std::filesystem;
这似乎很奇怪，因为gcc 8支持std :: filesystem并且它在命名空间中不可用，在访问std :: filesystem时我做错了什么吗?
This seems to be weird since the gcc 8 has support for std::filesystem and it is not available in namespace, am i doing anything wrong in accessing std::filesystem?
是的，我用-std = c ++ 17
and yes i built with -std=c++17
推荐答案
将文件系统库作为参数添加到编译器，该参数将转发到链接器.另外，请确保您使用的是C ++ 17. g ++和clang ++都接受这种特殊格式:
Add the filesystem library as an argument to your compiler that will be forwarded to the linker. Also make sure you are using C++17. Both g++ and clang++ accepts this particular format:
--std=c++17 -lstdc++fs
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