Add placeholder __libcpp_relaxed_store() for when atomic builtins are not available.
Summary:
In rL241532, atomic_support.h was added, which provides handling of
atomic operations for libc++. When atomic builtins are not available,
it emits a warning about being unsupported, but it still provides a
number of stubs for the required functions.
However, it misses a stub for `__libcpp_relaxed_store()`. Add it, by
using the same implementation as for `__libcpp_atomic_store()`.
(Note that I encountered this on arm-freebsd, which still defaults to
armv4, and does not have the runtime libcalls to support atomic
builtins. For now, I have simply disabled using them.)
Reviewers: mclow.lists, EricWF
Subscribers: theraven, cfe-commits, jroelofs, majnemer, aemerson
Differential Revision: http://reviews.llvm.org/D13051
llvm-svn: 248313
diff --git a/libcxx/src/include/atomic_support.h b/libcxx/src/include/atomic_support.h
index e738a51..dbf3b9c 100644
--- a/libcxx/src/include/atomic_support.h
+++ b/libcxx/src/include/atomic_support.h
@@ -103,6 +103,13 @@
*__dest = __val;
}
+template <class _ValueType, class _FromType>
+inline _LIBCPP_INLINE_VISIBILITY
+void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
+{
+ *__dest = __val;
+}
+
template <class _ValueType>
inline _LIBCPP_INLINE_VISIBILITY
_ValueType __libcpp_atomic_load(_ValueType const* __val,