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Description: Replace the legacy __sync built-in functions with __atomic ones
libunwind uses the built-in __sync_* functions which are deprecated by GCC and
should be replaced by __atomic_* ones. See the official manuals [1].
.
The legacy __sync functions do not require to specify the memory order but
__atomic ones do, so we choose the strongest one: __ATOMIC_SEQ_CST.
.
We do this because __sync_fetch_and_add() is not supported on armel.
.
[1]: https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html
Author: Kai-Chung Yan ()
Last-Update: 2016-10-04
--- a/include/libunwind_i.h
+++ b/include/libunwind_i.h
@@ -155,8 +155,8 @@
u.vp = addr;
return __sync_bool_compare_and_swap(u.vlp, (long) old, (long) new);
}
-# define fetch_and_add1(_ptr) __sync_fetch_and_add(_ptr, 1)
-# define fetch_and_add(_ptr, value) __sync_fetch_and_add(_ptr, value)
+# define fetch_and_add1(_ptr) __atomic_fetch_add(_ptr, 1, __ATOMIC_SEQ_CST)
+# define fetch_and_add(_ptr, value) __atomic_fetch_add(_ptr, value, __ATOMIC_SEQ_CST)
# define HAVE_CMPXCHG
# define HAVE_FETCH_AND_ADD
#endif
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