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c++ - directory_iterator 遇到段错误

问题描述

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。所以我开始了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

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

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

标签： c++segmentation-faultg++c++17

解决方案

我检查了directory_iterator在 Ubuntu 下使用 GCC 8 可以正常工作。

请务必-lstdc++fs在编译时添加链接器标志。

如果您没有编译成功，但至少在我的系统中，我会像开始迭代时一样遇到段错误。

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