Merge from Gnulib

This incorporates:
2018-01-01 maint: Run 'make update-copyright'
2017-12-29 Add cross-compilation results for GNU/Hurd.
2017-12-12 explicit_bzero: port to macOS + Clang 9.0.0

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/explicit_bzero.c b/lib/explicit_bzero.c
index 09093467769..78ec747c3a6 100644
--- a/lib/explicit_bzero.c
+++ b/lib/explicit_bzero.c
@@ -1,5 +1,5 @@
 /* Erasure of sensitive data, generic implementation.
-   Copyright (C) 2016-2017 Free Software Foundation, Inc.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -40,7 +40,7 @@ explicit_bzero (void *s, size_t len)
   explicit_memset (s, 0, len);
 #else
   memset (s, '\0', len);
-# ifdef __GNUC__
+# if defined __GNUC__ && !defined __clang__
   /* Compiler barrier.  */
   asm volatile ("" ::: "memory");
 # endif