https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95130
--- Comment #13 from Tomas Kalibera <tomas.kalibera at gmail dot com> --- Another instance of this problem is %z (to print size_t). It is supported by UCRT, but the GCC's Microsoft format warns, because it wasn't supported with MSVCRT (seen with GCC 12.2).
