directory_iterator 遇到段错误

Question

这是我的代码：

#include <iostream>
#include <filesystem>

int main(int argc, char *argv[]) {
    auto iter = std::filesystem::directory_iterator("foo");
    for (auto &entry : iter) {
        std::cout << entry.path();
    }
}

当我运行它并且目录foo存在时，我得到一个 SIGSEGV。所以我启动了 gdb：

(gdb) run
Starting program: /home/krausefx/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x0000555555556a87 in std::vector<std::filesystem::__cxx11::path::_Cmpt, std::allocator<std::filesystem::__cxx11::path::_Cmpt> >::~vector (
    this=0x23) at /usr/include/c++/8/bits/stl_vector.h:567
567     std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
(gdb) backtrace
#0  0x0000555555556a87 in std::vector<std::filesystem::__cxx11::path::_Cmpt, std::allocator<std::filesystem::__cxx11::path::_Cmpt> >::~vector (
    this=0x23) at /usr/include/c++/8/bits/stl_vector.h:567
#1  0x00005555555566aa in std::filesystem::__cxx11::path::~path (this=0x3) at /usr/include/c++/8/bits/fs_path.h:208
#2  0x0000555555557ebe in std::filesystem::__cxx11::path::_Cmpt::~_Cmpt (this=<incomplete type>) at /usr/include/c++/8/bits/fs_path.h:643
#3  0x0000555555557ed9 in std::_Destroy<std::filesystem::__cxx11::path::_Cmpt> (__pointer=0x3) at /usr/include/c++/8/bits/stl_construct.h:98
#4  0x0000555555557ced in std::_Destroy_aux<false>::__destroy<std::filesystem::__cxx11::path::_Cmpt*> (__first=0x3, __last=0x0)
    at /usr/include/c++/8/bits/stl_construct.h:108
#5  0x00005555555576de in std::_Destroy<std::filesystem::__cxx11::path::_Cmpt*> (__first=0x3, __last=0x0)
    at /usr/include/c++/8/bits/stl_construct.h:137
#6  0x0000555555556fb9 in std::_Destroy<std::filesystem::__cxx11::path::_Cmpt*, std::filesystem::__cxx11::path::_Cmpt> (__first=0x3, __last=0x0)
    at /usr/include/c++/8/bits/stl_construct.h:206
#7  0x0000555555556a9d in std::vector<std::filesystem::__cxx11::path::_Cmpt, std::allocator<std::filesystem::__cxx11::path::_Cmpt> >::~vector (
    this=0x7fffffffdcf0) at /usr/include/c++/8/bits/stl_vector.h:567
#8  0x00005555555566aa in std::filesystem::__cxx11::path::~path (this=0x7fffffffdcd0) at /usr/include/c++/8/bits/fs_path.h:208
#9  0x000055555555630d in main (argc=32767, argv=0x7ffff7fadf40 <std::wcout>) at test.cpp:5
(gdb) p this
$1 = (vector * const) 0x23

很明显，在初始化 the 时directory_iterator，std::filesystem::path出于某种原因调用了of 的析构函数，并且在那里的某个地方，std::vector在 athis值0x23，这显然是一件坏事并导致 SIGSEGV。

这里发生了什么事？难道我做错了什么？这是编译器错误吗（编译器是 g++ 8.3.0）？

Answer 1

我认为 std::filesystem 不稳定。它在我的项目中导致了段错误和其他问题（尤其是 msys2 附带的 mingw-w64 中的 std::filesystem::path ）。尝试更新您的 gcc 软件包并检查问题是否仍然存在。如果确实如此，那么您可以提交错误报告，或者只是等待并希望有人已经报告了它（在我的情况下，更新解决了问题）。