D29902.id87923.diff
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	Index: sys/sys/cdefs.h
	===================================================================
	--- sys/sys/cdefs.h
	+++ sys/sys/cdefs.h
	@@ -718,6 +718,19 @@
	#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. It's not clear that doing this automatically is standard's
	+ * complaint. However, definning _ISOC11_SOURCE to enable is compatible with
	+ * glibc; standards complaint; and easy enough to do to enable. We implement
	+ * this glibc extension, though it has not yet been standardized. The POSIX-1
	+ * standards allow enabling additional interfaces only when certain feature test
	+ * macros are defined.
	+ */
	+#if _ISOC11_SOURCE
	+#undef __ISO_C_VISIBLE
	+#define __ISO_C_VISIBLE 2011
	+#endif
	#else
	/*-
	* Deal with _ANSI_SOURCE: