2 @section @code{call_once}
7 @ref{Call Once,,Call Once,libc}.
10 @url{https://www.gnu.org/software/libc/manual/html_node/Call-Once.html}.
15 Portability problems fixed by Gnulib:
18 This function is missing on many platforms:
19 glibc 2.27, Mac OS X 10.13, FreeBSD 9.3, NetBSD 8.0, OpenBSD 6.7, Minix 3.1.8, AIX 7.1, HP-UX 11.31, IRIX 6.5, Solaris 11.3, Cygwin 2.9, mingw, MSVC 14, Android 9.0.
22 Portability problems not fixed by Gnulib: