[libc++] Do not specify the underlying type of memory_order
Summary:
This breaks ABI for folks using -fshort-enums, and does not really buy
us anything.
http://llvm.org/PR40977
Reviewers: mclow.lists, EricWF
Subscribers: christof, jkorous, dexonsmith, libcxx-commits, zoecarver
Differential Revision: https://reviews.llvm.org/D59029
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@355521 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/atomic b/include/atomic
index e34b867..f0707b7 100644
--- a/include/atomic
+++ b/include/atomic
@@ -586,7 +586,7 @@
#if _LIBCPP_STD_VER > 17
-enum class memory_order: unsigned {
+enum class memory_order {
relaxed, consume, acquire, release, acq_rel, seq_cst
};
@@ -597,9 +597,6 @@
inline constexpr auto memory_order_acq_rel = memory_order::acq_rel;
inline constexpr auto memory_order_seq_cst = memory_order::seq_cst;
-static_assert((is_same<underlying_type<memory_order>::type,
- unsigned>::value), "Underlying type differs from unsigned unexpectedly");
-
#else
typedef enum memory_order {
@@ -607,12 +604,9 @@
memory_order_release, memory_order_acq_rel, memory_order_seq_cst
} memory_order;
-static_assert((is_same<underlying_type<memory_order>::type,
- unsigned>::value), "Underlying type differs from unsigned unexpectedly");
-
#endif // _LIBCPP_STD_VER > 17
-typedef underlying_type<memory_order>::type __memory_order_underlying_t; // unsigned
+typedef underlying_type<memory_order>::type __memory_order_underlying_t;
#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) || \
