/* Attributes */
#include <linux/compiler_attributes.h>
+/* Builtins */
+
+/*
+ * __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21.
+ * In the meantime, to support gcc < 10, we implement __has_builtin
+ * by hand.
+ */
+#ifndef __has_builtin
+#define __has_builtin(x) (0)
+#endif
+
/* Compiler specific macros. */
#ifdef __clang__
#include <linux/compiler-clang.h>