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-rw-r--r--string/byteswap.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/string/byteswap.h b/string/byteswap.h
index 18ca95d..7d76957 100644
--- a/string/byteswap.h
+++ b/string/byteswap.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 2012 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
@@ -18,6 +18,8 @@
#ifndef _BYTESWAP_H
#define _BYTESWAP_H 1
+#include <features.h>
+
/* Get the machine specific, optimized definitions. */
#include <bits/byteswap.h>
@@ -31,7 +33,7 @@
/* Return a value with all bytes in the 32 bit argument swapped. */
#define bswap_32(x) __bswap_32 (x)
-#if defined __GNUC__ && __GNUC__ >= 2
+#if __GLIBC_HAVE_LONG_LONG
/* Return a value with all bytes in the 64 bit argument swapped. */
# define bswap_64(x) __bswap_64 (x)
#endif