D49445.1775074857.diff
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	diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
	--- a/sys/sys/cdefs.h
	+++ b/sys/sys/cdefs.h
	@@ -502,6 +502,25 @@
	* Our macros begin with two underscores to avoid namespace screwage.
	*/

	+/*
	+ * Cope with a now-common error: users defined __BSD_VISIBLE bogusly in the
	+ * absence of clear advice during the years FreeBSD didn't have people watching
	+ * the namespace and practices well. This will eventually be a #error
	+ */
	+#ifdef __BSD_VISIBLE
	+#undef __BSD_VISIBLE
	+#undef _BSD_SOURCE
	+#define _BSD_SOURCE
	+#endif
	+
	+#ifdef _BSD_SOURCE
	+#define __POSIX_VISIBLE 202405
	+#define __XSI_VISIBLE 800
	+#define __BSD_VISIBLE 1
	+#define __ISO_C_VISIBLE 2023
	+#define __EXT1_VISIBLE 1
	+#else /* for review I've not indented the #if mandness below */
	+
	/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
	#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
	#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
	@@ -653,6 +672,7 @@
	#endif
	#endif /* __STDC_WANT_LIB_EXT1__ */

	+#endif /* ! _BSD_SOURCE */
	/*
	* Nullability qualifiers: currently only supported by Clang.
	*/