D45836.id140473.diff
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D45836.id140473.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
	@@ -349,9 +349,7 @@

	/*
	* Compiler-dependent macros to declare that functions take printf-like
	- * or scanf-like arguments. They are null except for versions of gcc
	- * that are known to support the features properly (old versions of gcc-2
	- * didn't permit keeping the keywords out of the application namespace).
	+ * or scanf-like arguments.
	*/
	#define __printflike(fmtarg, firstvararg) \
	__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
	@@ -363,8 +361,20 @@
	#define __strftimelike(fmtarg, firstvararg) \
	__attribute__((__format__ (__strftime__, fmtarg, firstvararg)))

	+/*
	+ * Like __printflike, but allows fmtarg to be NULL. All supported FreeBSD
	+ * versions of gcc have this feature, but stock versions of gcc, including
	+ * lang/gcc, do not. Clang has it for all supported versions. While stock
	+ * versions of gcc ignore printf0 in system headers, we define it away so
	+ * -Wsystem-headers is more useful for those versions. tcc and pcc mirror gcc's
	+ * behavior.
	+ */
	+#if defined(__clang__) \|\| (defined(__GNUC__) && defined(__FreeBSD_cc_version))
	#define __printf0like(fmtarg, firstvararg) \
	__attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
	+#else
	+#define __printf0like(fmtarg, firstvararg)
	+#endif

	#define __strong_reference(sym,aliassym) \
	extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))