[Bug libstdc++/37475] [DR 382] codecvt::do_in/do_out functions return "ok" when the output sequence has zero length

[kristian.spangsege at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37475

--- Comment #7 from Kristian Spangsege <kristian.spangsege at gmail dot com> ---
This bug still exists in GCC 14.0.1. This was tested with the attacked
test_2.cpp. The actual result is `ok`, but it should have been `partial`.

Curiously, this bug does not occur when using the Cygwin or MinGW versions of
GCC. In these cases, the result is `partial` as it should be. I assume this is
because on Cygwin and MinGW, libstdc++ uses a generic locale implementation
that is different from the one ordinarily used on Linux.