* doc/posix-headers/stdlib.texi: Document issue and workaround.
+2023-03-25 Bruno Haible <bruno@clisp.org>
+
+ stdlib: ISO C 23: Document issue with once_flag and call_once.
+ * doc/posix-headers/stdlib.texi: Document issue and workaround.
+
2023-03-25 Bruno Haible <bruno@clisp.org>
call_once: New module, separate from mtx.
Portability problems not fixed by Gnulib:
@itemize
@item
+The definition of the type @code{once_flag}, of the macro
+@code{ONCE_FLAG_INIT}, and the declaration of the function
+@code{call_once}, that are required by ISO C 23, are not provided.
+To get them, import Gnulib module @code{call_once} and include
+@code{<threads.h>} rather than @code{<stdlib.h>}.
+@item
System status macros such as @code{WEXITSTATUS} require an lvalue
argument on some platforms.
macOS 11.1.