D56393.id175806.diff
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D56393.id175806.diff
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	diff --git a/sys/compat/linuxkpi/common/include/linux/compiler_types.h b/sys/compat/linuxkpi/common/include/linux/compiler_types.h
	--- a/sys/compat/linuxkpi/common/include/linux/compiler_types.h
	+++ b/sys/compat/linuxkpi/common/include/linux/compiler_types.h
	@@ -42,4 +42,17 @@

	#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))

	+/*
	+ * __builtin_counted_by_ref was introduced to
	+ * - gcc in e7380688fa59 with a first release tag of gcc-15.1.0,
	+ * - llvm in 7475156d49406 with a first release tag of llvmorg-20.1.0-rc1
	+ * but cannot be used before 23 (22.x.y possibly) (see 09a3d830a888).
	+ */
	+#if (__has_builtin(__builtin_counted_by_ref)) && \
	+ (!defined(__clang__) \|\| (__clang_major__ >= 23))
	+#define __flex_counter(_field) __builtin_counted_by_ref(_field)
	+#else
	+#define __flex_counter(_field) ((void *)NULL)
	+#endif
	+
	#endif