[libcxx] r239648 - Prevent dependancy on libatomic when using GCC to provide <atomic>.

[Eric Fiselier]

Author: ericwf
Date: Fri Jun 12 19:23:07 2015
New Revision: 239648

URL: http://llvm.org/viewvc/llvm-project?rev=239648&view=rev
Log:
Prevent dependancy on libatomic when using GCC to provide <atomic>.

The __atomic_is_lock_free(...) function sometimes requires linkage to libatomic
if it cannot be evaluated at compile time. Remove __c11_atomic_is_lock_free
and use __atomic_is_lock_free(sizeof(Tp)) directly so that it can be evaluated
at compile time.

Modified:
    libcxx/trunk/include/atomic

Modified: libcxx/trunk/include/atomic
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/atomic?rev=239648&r1=239647&r2=239648&view=diff
==============================================================================
--- libcxx/trunk/include/atomic (original)
+++ libcxx/trunk/include/atomic Fri Jun 12 19:23:07 2015
@@ -633,10 +633,6 @@ static inline void __c11_atomic_signal_f
   __atomic_signal_fence(__gcc_atomic::__to_gcc_order(__order));
 }
 
-static inline bool __c11_atomic_is_lock_free(size_t __size) {
-  return __atomic_is_lock_free(__size, 0);
-}
-
 template <typename _Tp>
 static inline void __c11_atomic_store(volatile _Atomic(_Tp)* __a,  _Tp __val,
                                       memory_order __order) {
@@ -827,10 +823,16 @@ struct __atomic_base  // false
 
     _LIBCPP_INLINE_VISIBILITY
     bool is_lock_free() const volatile _NOEXCEPT
-        {return __c11_atomic_is_lock_free(sizeof(_Tp));}
+    {
+#if __has_feature(cxx_atomic)
+    return __c11_atomic_is_lock_free(sizeof(_Tp));
+#else
+    return __atomic_is_lock_free(sizeof(_Tp), 0);
+#endif
+    }
     _LIBCPP_INLINE_VISIBILITY
     bool is_lock_free() const _NOEXCEPT
-        {return __c11_atomic_is_lock_free(sizeof(_Tp));}
+        {return static_cast<__atomic_base const volatile*>(this)->is_lock_free();}
     _LIBCPP_INLINE_VISIBILITY
     void store(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
         {__c11_atomic_store(&__a_, __d, __m);}