D44665.1794595520.diff
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	diff --git a/include/stddef.h b/include/stddef.h
	--- a/include/stddef.h
	+++ b/include/stddef.h
	@@ -32,6 +32,9 @@
	#ifndef _STDDEF_H_
	#define _STDDEF_H_

	+#ifndef __STDC_VERSION_STDDEF_H__
	+#define __STDC_VERSION_STDDEF_H__ 202311L
	+
	#include <sys/cdefs.h>
	#include <sys/_null.h>
	#include <sys/_types.h>
	@@ -78,4 +81,10 @@
	#endif
	#endif /* __EXT1_VISIBLE */

	+#if __STDC_VERSION__ >= 202311L
	+#define unreachable() __unreachable()
	+#endif
	+
	+#endif /* __STDC_VERSION_STDDEF_H__ */
	+
	#endif /* _STDDEF_H_ */
	diff --git a/sys/sys/_null.h b/sys/sys/_null.h
	--- a/sys/sys/_null.h
	+++ b/sys/sys/_null.h
	@@ -29,7 +29,11 @@
	#ifndef NULL

	#if !defined(__cplusplus)
	+#if __STDC_VERSION__ >= 202311L
	+#define NULL nullptr
	+#else /* __STDC_VERSION__ < 202311L */
	#define NULL ((void *)0)
	+#endif /* __STDC_VERSION__ >= 202311L */
	#else
	#if __cplusplus >= 201103L
	#define NULL nullptr
	@@ -44,4 +48,8 @@
	#endif /* __GNUG__ */
	#endif /* !__cplusplus */

	+#if __STDC_VERSION__ >= 202311L
	+typedef typeof_unqual(nullptr) nullptr_t;
	+#endif
	+
	#endif