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-rw-r--r--bits/byteswap.h13
1 files changed, 7 insertions, 6 deletions
diff --git a/bits/byteswap.h b/bits/byteswap.h
index a5dd4a7db3..73189cfe5c 100644
--- a/bits/byteswap.h
+++ b/bits/byteswap.h
@@ -54,10 +54,11 @@ __bswap32 (unsigned int x)
 #if defined __GNUC__ && __GNUC__ >= 2
 /* Swap bytes in 64 bit value.  */
 # define __bswap_64(x) \
-     ({ union { unsigned long long int __ll;				      \
-		unsigned long int __l[2]; } __v, __r;			      \
-        __v.__ll = (x);							      \
-	__r.__l[0] = __bswap_32 (__v.__l[1]);				      \
-	__r.__l[1] = __bswap_32 (__v.__l[0]);				      \
-	__r.__ll; })
+     (__extension__							      \
+      ({ union { unsigned long long int __ll;				      \
+		 unsigned long int __l[2]; } __v, __r;			      \
+	 __v.__ll = (x);						      \
+	 __r.__l[0] = __bswap_32 (__v.__l[1]);				      \
+	 __r.__l[1] = __bswap_32 (__v.__l[0]);				      \
+	 __r.__ll; }))
 #endif