[Bug other/93067] diagnostics are not aware of -finput-charset

[lhyatt at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93067

--- Comment #1 from Lewis Hyatt <lhyatt at gmail dot com> ---
Created attachment 47548
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47548&action=edit
testcases