[Bug libstdc++/108178] Filesystem::copy_file can't copy from /proc on Linux machines

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108178

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
In hindsight the files in /proc should probably have been named pipes, not
regular files.