jamesr added a comment.

In http://reviews.llvm.org/D14731#376128, @EricWF wrote:

> So I fixed up LIT so that it also adds "-Werror=thread-safety" for both 
> ".pass.cpp" and ".fail.cpp" tests. Could you apply it to your patch?
>  https://gist.github.com/EricWF/8a0bfb6ff02f8c9f9940


Cool! Applied and confirmed that it's set for both.


================
Comment at: include/__mutex_base:37
@@ -30,1 +36,3 @@
+
+class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) 
mutex
 {
----------------
EricWF wrote:
> Does `capability` have a alternative keyword that's a reserved name? ie 
> `__capability__`? If so we should use that instead.
If I'm reading 
https://github.com/llvm-mirror/clang/blob/master/include/clang/Basic/Attr.td#L1657
 correctly:

def Capability : InheritableAttr {
  let Spellings = [GNU<"capability">, CXX11<"clang", "capability">,
                   GNU<"shared_capability">,
                   CXX11<"clang", "shared_capability">];

then the answer is unfortunately "no"


http://reviews.llvm.org/D14731



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