[boost] [atomic] ia32/cmpxchg8b fix

Subject: [boost] [atomic] ia32/cmpxchg8b fix
From: Tim Blechmann (tim_at_[hidden])
Date: 2012-09-07 09:05:05

one of my users reported an issue with atomic on gcc/ia32, related to
const-correctness.

ok to commit this fix?

thanks, tim

Index: boost/atomic/detail/gcc-x86.hpp
===================================================================
--- boost/atomic/detail/gcc-x86.hpp     (revision 80433)
+++ boost/atomic/detail/gcc-x86.hpp     (working copy)
@@ -1556,11 +1556,11 @@

 template<typename T>
 T
-platform_load64(volatile T * ptr)
+platform_load64(const volatile T * ptr)
 {
     T expected = *ptr;
     do {
-    } while (!platform_cmpxchg64_strong(expected, expected, ptr));
+    } while (!platform_cmpxchg64_strong(expected, expected,
const_cast<volatile T*>(ptr)));
     return expected;
 }