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-rw-r--r--sysdeps/s390/bits/byteswap.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/s390/bits/byteswap.h b/sysdeps/s390/bits/byteswap.h
index 6f96257005..9221ea2cfc 100644
--- a/sysdeps/s390/bits/byteswap.h
+++ b/sysdeps/s390/bits/byteswap.h
@@ -123,6 +123,7 @@ __bswap_32 (unsigned int __bsx)
       | (((x) & 0x000000000000ff00ull) << 40)				      \
       | (((x) & 0x00000000000000ffull) << 56))
 
+__extension__
 static __inline unsigned long long int
 __bswap_64 (unsigned long long int __bsx)
 {