D38215.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
	@@ -312,6 +312,9 @@
	* __generic(). Unlike _Generic(), this macro can only distinguish
	* between a single type, so it requires nested invocations to
	* distinguish multiple cases.
	+ *
	+ * Note that the comma operator is used to force expr to decay in
	+ * order to match _Generic().
	*/

	#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \|\| \
	@@ -321,7 +324,7 @@
	#elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
	#define __generic(expr, t, yes, no) \
	__builtin_choose_expr( \
	- __builtin_types_compatible_p(__typeof(expr), t), yes, no)
	+ __builtin_types_compatible_p(__typeof((0, (expr))), t), yes, no)
	#endif

	/*