linkat
======

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/linkat.html

Gnulib module: linkat

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: glibc 2.3.6, Mac OS X < 10.10, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14, Android 4.4. But the replacement function is not safe to be used in libraries and is not multithread-safe.

  * This function fails to directly hardlink symlinks on some platforms: Mac OS X 10.10.

  * This function fails to reject trailing slashes on non-directories on some platforms: AIX 7.1, Solaris 11.3, Mac OS X 10.10.

  * This functions does not support AT_SYMLINK_FOLLOW on some platforms: Linux kernel 2.6.17.

Portability problems not fixed by Gnulib: