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-rw-r--r--sysdeps/sparc/sparc64/atomic-machine.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/atomic-machine.h b/sysdeps/sparc/sparc64/atomic-machine.h
index 44a43ff0f5..72009329c3 100644
--- a/sysdeps/sparc/sparc64/atomic-machine.h
+++ b/sysdeps/sparc/sparc64/atomic-machine.h
@@ -47,6 +47,9 @@ typedef uintmax_t uatomic_max_t;
 #define __HAVE_64B_ATOMICS 1
 #define USE_ATOMIC_COMPILER_BUILTINS 0
 
+/* XXX Is this actually correct?  */
+#define ATOMIC_EXCHANGE_USES_CAS 1
+
 
 #define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
   (abort (), (__typeof (*mem)) 0)