[Bug c++/99805] filesystem::path::parent_path got a wrong path

[drfeng08 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99805

--- Comment #2 from hao an <drfeng08 at gmail dot com> ---
(In reply to Jonathan Wakely from comment #1)
> I cannot reproduce this with upstream GCC. This looks like a bug in
> devtoolset-10, so I'll report it to Red Hat's bugzilla instead.

Hi, I reproduce it in ubuntu , we should add flag "-D_GLIBCXX_USE_CXX11_ABI=0".

```
root@D4152DC50BFA208:~# g++ ans8.cpp -std=c++17 -D_GLIBCXX_USE_CXX11_ABI=0
root@D4152DC50BFA208:~# ./a.out
"/ssd1/opt/stdpain/workspace"
"/ssd1/opt/stdpain/workspace"

root@D4152DC50BFA208:~# g++ ans8.cpp -std=c++17 -D_GLIBCXX_USE_CXX11_ABI=1
root@D4152DC50BFA208:~# ./a.out
"/ssd1/opt/stdpain/workspace"
"/ssd1/opt/stdpain"

```