D29902.id88644.diff
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	Index: sys/sys/cdefs.h
	===================================================================
	--- sys/sys/cdefs.h
	+++ sys/sys/cdefs.h
	@@ -718,6 +718,18 @@
	#define __POSIX_VISIBLE 198808
	#define __ISO_C_VISIBLE 0
	#endif /* _POSIX_C_SOURCE */
	+/*
	+ * glibc enables c11 features when _ISOC11_SOURCE is defined, or when compiling
	+ * with -stdc=c11. OpenBSD does explicitly as well for both as well. A strict
	+ * reading of the standard would suggest doing it only for the former. However,
	+ * a strict reading also requires C99 mode only, so C11 is already undefined.
	+ * To be maximially useful, we follow glibc's and OpenBSD's lead for this
	+ * non-standard configuration.
	+ */
	+#if _ISOC11_SOURCE \|\| (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L)
	+#undef __ISO_C_VISIBLE
	+#define __ISO_C_VISIBLE 2011
	+#endif
	#else
	/*-
	* Deal with _ANSI_SOURCE: