错误使用<filesystem> C++17

Question

我正在尝试搜索目录并以非平台相关的方式列出该目录中的所有条目。 为此，我尝试使用 std::filesystem，但是，在尝试使用那里定义的函数时，我遇到了大量编译错误。

这是我尝试运行的示例代码（编辑：即使我删除了 for 循环并只保留“返回 0”，我也会收到相同的错误）：

#include <iostream>
#include <string>
#include <filesystem>

int main()
{
   for (const auto & entry : std::filesystem::directory_iterator("D:\\fac_2ano2semestre"))
        std::cout << entry.path() << std::endl;

    return 0;
}

这是 g++ --version 的输出：

g++.exe (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 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.

这是我的 Makefile 中的一个示例（我也试过 -lstdc++fs）：

# Compiler
CXX := g++

# Add whatever compiler flags you want.
CXXFLAGS := -std=c++17 
CXXFLAGS += -Wall -g 

# You MUST keep this for auto-dependency generation.
CXXFLAGS += -MMD

我收到的错误的一小部分：

g++ -std=c++17  -Wall -g  -MMD   -c -o src/app.o src/app.cpp
In file included from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/filesystem:37,
                 from src/app.cpp:3:
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/fs_path.h: In member function 'std::filesystem::__cxx11::path& std::filesystem::__cxx11::path::operator/=(const std::filesystem::__cxx11::path&)':
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/fs_path.h:237:47: error: no match for 'operator!=' (operand types are 'std::filesystem::__cxx11::path' and 'std::filesystem::__cxx11::path')
    || (__p.has_root_name() && __p.root_name() != root_name()))
                               ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
In file included from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iosfwd:40,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/ios:38,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/ostream:38,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:39,
                 from src/app.cpp:1:
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/postypes.h:221:5: note: candidate: 'template<class _StateT> bool std::operator!=(const std::fpos<_StateT>&, const std::fpos<_StateT>&)'
     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^~~~~~~~
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/postypes.h:221:5: note:   template argument deduction/substitution failed:
In file included from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/filesystem:37,
                 from src/app.cpp:3:
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/fs_path.h:237:60: note:   'std::filesystem::__cxx11::path' is not derived from 'const std::fpos<_StateT>'
    || (__p.has_root_name() && __p.root_name() != root_name()))
                                                            ^
In file included from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/stl_algobase.h:64,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/char_traits.h:39,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/ios:40,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/ostream:38,
                 from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:39,
                 from src/app.cpp:1:
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/stl_pair.h:456:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)'
     operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^~~~~~~~
D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/stl_pair.h:456:5: note:   template argument deduction/substitution failed:
In file included from D:/mingw/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/filesystem:37,
                 from src/app.cpp:3:

Answer 1

从这里下载最新版本的编译器： http : //winlibs.com/然后只需将其解压缩以覆盖当前的 mingw-64。 如果需要，更新 PATH。 我有同样的问题，它修复了它。