perror always return 'No such file or directory'

[Freed-Wu]

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To Reproduce

[cling]$ #include <stdio.h>
[cling]$ #include <stdlib.h>
[cling]$ fopen("/root/a", "r+");
[cling]$ perror("a");
a: No such file or directory

Expected behavior

[cling]$ #include <stdio.h>
[cling]$ #include <stdlib.h>
[cling]$ fopen("/root/a", "r+");
[cling]$ perror("a");
a: Permission denied

A simpler example:

[cling]$ #include <stdio.h>
[cling]$ perror("a");
a: No such file or directory

Expected

[cling]$ #include <stdio.h>
[cling]$ perror("a");
a: Success

Setup

1. Cling version 0.9
2. Operating system 6.2.7-arch1-1
3. How you obtained Cling, such as with cpt.py (also mention flags) / you built it yourself.
   pacman

Additional context