Bug 167552

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 On FreeBSD 10.0-CURRENT/amd64, compiling with gcc46 and gcc47 as well as
 with legacy gcc4.2.1. I don't know why this does not work on FreeBSD
 9.0-STABLE.
 
 I found a solution for CLANG, following the URL provided below. The
 solution sounds reasonable. Attached, you'll find a patchfile.
 
 URL:
 
 http://forum.openscenegraph.org/viewtopic.php?t=3D10121
 
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  name="patch-include-OpenThreads-Atomic"
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  filename="patch-include-OpenThreads-Atomic"
 
 --- include/OpenThreads/Atomic.orig	2012-05-03 08:12:27.000000000 +0200
 +++ include/OpenThreads/Atomic	2012-05-03 08:13:02.000000000 +0200
 @@ -241,7 +241,7 @@
  AtomicPtr::assign(void* ptrNew, const void* const ptrOld)
  {
  #if defined(_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS)
 -    return __sync_bool_compare_and_swap(&_ptr, ptrOld, ptrNew);
 +    return __sync_bool_compare_and_swap(&_ptr, (void*)ptrOld, ptrNew);
  #elif defined(_OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS)
      return __compare_and_swap((unsigned long*)&_ptr, (unsigned long)ptrO=
 ld, (unsigned long)ptrNew);
  #elif defined(_OPENTHREADS_ATOMIC_USE_SUN)
 
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