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@node call_once
@section @code{call_once}
@findex call_once

Documentation:@*
@ifinfo
@ref{Call Once,,Call Once,libc}.
@end ifinfo
@ifnotinfo
@url{https://www.gnu.org/software/libc/manual/html_node/Call-Once.html}.
@end ifnotinfo

Gnulib module: call_once

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on many platforms:
glibc 2.27, macOS 11.1, 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.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This function does not work on some platforms:
@c https://dev.haiku-os.org/ticket/18348
Haiku.
@end itemize