1 files changed, 25 insertions, 0 deletions

diff --git a/dynamic-layers/selinux/android-tools/android-tools/libunwind-debian/legacy_built-in_sync_functions.patch b/dynamic-layers/selinux/android-tools/android-tools/libunwind-debian/legacy_built-in_sync_functions.patch
new file mode 100644
index 0000000..8d78faa
--- /dev/null
+++ b/dynamic-layers/selinux/android-tools/android-tools/libunwind-debian/legacy_built-in_sync_functions.patch
@@ -0,0 +1,25 @@
+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