Fix GCC 5.x compatibility for AArch64 double-wide primitives

Small change to make aarch64 support work with gcc 5.x. Otherwise it
demands gcc -latomic and still fails test_stack.

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_double_load,
AO_double_load_acquire, AO_double_store, AO_double_store_release,
AO_double_compare_and_swap, AO_double_compare_and_swap_acquire,
AO_double_compare_and_swap_release, AO_double_compare_and_swap_full):
Use assembly implementation even for GCC v5+ (not just GCC 4.x).

diff --git a/src/atomic_ops/sysdeps/gcc/aarch64.h b/src/atomic_ops/sysdeps/gcc/aarch64.h
index f969f13..b7f2ef0 100644 (file)
--- a/src/atomic_ops/sysdeps/gcc/aarch64.h
+++ b/src/atomic_ops/sysdeps/gcc/aarch64.h
@@ -30,7 +30,7 @@
 #endif
 
 /* TODO: Adjust version check on fixing double-wide AO support in GCC. */
-#if __GNUC__ == 4
+#if __GNUC__ >= 4
 
   AO_INLINE AO_double_t
   AO_double_load(const volatile AO_double_t *addr)
@@ -195,6 +195,6 @@
     return !result;
   }
 # define AO_HAVE_double_compare_and_swap_full
-#endif /* __GNUC__ == 4 */
+#endif /* __GNUC__ >= 4 */
 
 #include "generic.h"