5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/fwide.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
16 This function is missing on some platforms:
17 Minix 3.1.8, HP-UX 11.00, Cygwin 1.5.x, MSVC 14.
19 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
20 accommodate all Unicode characters.
22 @code{fwide} is not guaranteed to be able to change a file stream's mode
23 to a different mode than the current one.