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-rw-r--r--include/sys/cdefs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index a4359a05c..5c4daebcd 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -330,6 +330,17 @@
# endif
#endif
+/* Undefine (also defined in libc-symbols.h). */
+#undef __attribute_copy__
+#if __GNUC_PREREQ (9, 0)
+/* Copies attributes from the declaration or type referenced by
+ the argument. */
+# define __attribute_copy__(arg) __attribute__ ((__copy__ (arg)))
+#else
+# define __attribute_copy__(arg)
+#endif
+
+
/* GCC 4.3 and above allow passing all anonymous arguments of an
__extern_always_inline function to some other vararg function. */
#if __GNUC_PREREQ (4,3)