--- glibc-2.26/misc/sys/cdefs.h.omv~	2018-01-24 11:32:15.276543892 +0100
+++ glibc-2.26/misc/sys/cdefs.h	2018-01-24 11:32:47.208618287 +0100
@@ -38,7 +38,7 @@
 
 /* All functions, except those with callbacks or those that
    synchronize memory, are leaf functions.  */
-# if __GNUC_PREREQ (4, 6) && !defined _LIBC
+# if __GNUC_PREREQ (4, 6) && !defined _LIBC && (!defined(__clang__) || __has_attribute(leaf))
 #  define __LEAF , __leaf__
 #  define __LEAF_ATTR __attribute__ ((__leaf__))
 # else