我想在 C++17 中尝试新的文件系统库，所以尝试从 cppreference.com 复制 std：：filesystem：：current_path 示例，并使用最新版本 (16.0( 的 MinGW 发行版从我的 Windows 10 x64 机器上的 nuwen.net 编译它。 这包括 gcc v8.1，根据编译器支持页面 cppreference.com 它应该支持文件系统库。
这是我尝试编译的代码：
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main()
{
std::cout << "Current path is " << fs::current_path() << 'n';
}
我正在使用的编译器命令：
g++ -std=c++17 filesystem_test.cpp
这是我尝试编译时遇到的错误：
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h: In member function 'std::filesystem::__cxx11::path& std::filesystem::__cxx11::path::operator/=(const std::filesystem::__cxx11::path&)':
c:mingwincludec++8.1.0bitsfs_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 c:mingwincludec++8.1.0iosfwd:40,
from c:mingwincludec++8.1.0ios:38,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitspostypes.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)
^~~~~~~~
c:mingwincludec++8.1.0bitspostypes.h:221:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_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 c:mingwincludec++8.1.0bitsstl_algobase.h:64,
from c:mingwincludec++8.1.0bitschar_traits.h:39,
from c:mingwincludec++8.1.0ios:40,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsstl_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)
^~~~~~~~
c:mingwincludec++8.1.0bitsstl_pair.h:456:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::pair<_T1, _T2>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsstl_algobase.h:67,
from c:mingwincludec++8.1.0bitschar_traits.h:39,
from c:mingwincludec++8.1.0ios:40,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsstl_iterator.h:311:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)'
operator!=(const reverse_iterator<_Iterator>& __x,
^~~~~~~~
c:mingwincludec++8.1.0bitsstl_iterator.h:311:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::reverse_iterator<_Iterator>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsstl_algobase.h:67,
from c:mingwincludec++8.1.0bitschar_traits.h:39,
from c:mingwincludec++8.1.0ios:40,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsstl_iterator.h:349:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)'
operator!=(const reverse_iterator<_IteratorL>& __x,
^~~~~~~~
c:mingwincludec++8.1.0bitsstl_iterator.h:349:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::reverse_iterator<_Iterator>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsstl_algobase.h:67,
from c:mingwincludec++8.1.0bitschar_traits.h:39,
from c:mingwincludec++8.1.0ios:40,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsstl_iterator.h:1124:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)'
operator!=(const move_iterator<_IteratorL>& __x,
^~~~~~~~
c:mingwincludec++8.1.0bitsstl_iterator.h:1124:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::move_iterator<_IteratorL>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsstl_algobase.h:67,
from c:mingwincludec++8.1.0bitschar_traits.h:39,
from c:mingwincludec++8.1.0ios:40,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsstl_iterator.h:1130:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)'
operator!=(const move_iterator<_Iterator>& __x,
^~~~~~~~
c:mingwincludec++8.1.0bitsstl_iterator.h:1130:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::move_iterator<_IteratorL>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0string:41,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsallocator.h:158:5: note: candidate: 'template<class _T1, class _T2> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_T2>&)'
operator!=(const allocator<_T1>&, const allocator<_T2>&)
^~~~~~~~
c:mingwincludec++8.1.0bitsallocator.h:158:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::allocator<_CharT>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0string:41,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsallocator.h:164:5: note: candidate: 'template<class _Tp> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_CharT>&)'
operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
^~~~~~~~
c:mingwincludec++8.1.0bitsallocator.h:164:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::allocator<_CharT>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsbasic_string.h:48,
from c:mingwincludec++8.1.0string:52,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0string_view:454:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)'
operator!=(basic_string_view<_CharT, _Traits> __x,
^~~~~~~~
c:mingwincludec++8.1.0string_view:454:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'std::basic_string_view<_CharT, _Traits>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsbasic_string.h:48,
from c:mingwincludec++8.1.0string:52,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0string_view:460:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(std::basic_string_view<_CharT, _Traits>, std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >)'
operator!=(basic_string_view<_CharT, _Traits> __x,
^~~~~~~~
c:mingwincludec++8.1.0string_view:460:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'std::basic_string_view<_CharT, _Traits>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0bitsbasic_string.h:48,
from c:mingwincludec++8.1.0string:52,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0string_view:466:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)'
operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
^~~~~~~~
c:mingwincludec++8.1.0string_view:466:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'std::basic_string_view<_CharT, _Traits>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0string:52,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsbasic_string.h:6056:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~~~~~
c:mingwincludec++8.1.0bitsbasic_string.h:6056:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: 'std::filesystem::__cxx11::path' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0string:52,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsbasic_string.h:6069:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
operator!=(const _CharT* __lhs,
^~~~~~~~
c:mingwincludec++8.1.0bitsbasic_string.h:6069:5: note: template argument deduction/substitution failed:
In file included from c:mingwincludec++8.1.0filesystem:37,
from filesystem_test.cpp:2:
c:mingwincludec++8.1.0bitsfs_path.h:237:60: note: mismatched types 'const _CharT*' and 'std::filesystem::__cxx11::path'
|| (__p.has_root_name() && __p.root_name() != root_name()))
^
In file included from c:mingwincludec++8.1.0string:52,
from c:mingwincludec++8.1.0bitslocale_classes.h:40,
from c:mingwincludec++8.1.0bitsios_base.h:41,
from c:mingwincludec++8.1.0ios:42,
from c:mingwincludec++8.1.0ostream:38,
from c:mingwincludec++8.1.0iostream:39,
from filesystem_test.cpp:1:
c:mingwincludec++8.1.0bitsbasic_string.h:6081:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)'
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~~~~~
<snip>
注意 我必须剪掉错误消息的末尾以减少此问题的字符数。 我把整个错误消息放在这里：https://pastebin.com/pnfMnMs7
编辑：根据Galik的评论，我尝试将编译器命令更改为
g++ -std=c++17 filesystem_test.cpp -lstdc++fs
但是我似乎得到了与以前完全相同的错误
尝试最新的 msys2 而不是 nuwen 发行版：
-
吃豆人-休
-
吃豆人 -S 明夫-W64-x86_64-GCC
-
海湾合作委员会 -V
$ 海湾合作委员会 -v 使用内置规范。 COLLECT_GCC=C：\msys64\mingw64\bin\gcc.exe COLLECT_LTO_WRAPPER=C：/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.2.0/lto-wrapper.exe 目标：x86_64-W64-明32 配置： ../gcc-8.2.0/配置 --前缀=/mingw64 --with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --with-native-system-header-dir=/mingw64/x86_64-w64-mingw32/include --libexecdir=/mingw64/lib --enable-bootstrap --with-arch=x86-64 --with-tune=generic --enable-languages=ada，c，lto，c++，objc，obj-c++，fortran --enable-shared --enable-static --enable-libatomic --enable-threads=posix --enable-graphite --enable-full-dynamic-string --enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes --disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check --enable-lto --enable-libgomp --disable-multilib --enable-checking=release --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-libiconv --with-system-zlib --with-gmp=/mingw64 --with-mpfr=/mingw64 --with-mpc=/mingw64 --with-isl=/mingw64 --with-pkgversion='Rev1， 由 MSYS2 project' 构建 --with-bugurl=https：//sourceforge.net/projects/msys2 --with-gnu-as --with-gnu-ld 螺纹型号：磅 gcc 版本 8.2.0(Rev1，由 MSYS2 项目构建(