5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/memcmp.html}
9 Portability problems fixed by Gnulib:
12 This function fails when comparing 16 bytes or more and with at least one
13 buffer not starting on a 4-byte boundary on some older platforms:
17 Portability problems not fixed by Gnulib:
20 This function produces wrong results when the arguments are constant strings
21 and the compiler is clang 6.0.1.