Create a build_config header file.

src/include/atomic_ops.h

 /*
  * Copyright 2008, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 22 matching lines @@
 #ifndef NATIVE_CLIENT_SRC_INCLUDE_ATOMIC_OPS_H_
 #define NATIVE_CLIENT_SRC_INCLUDE_ATOMIC_OPS_H_ 1
 
 /* ------------------------------------------------------------------------
  * Include the platform specific implementations of the types
  * and operations listed below.
  * ------------------------------------------------------------------------
  */
 
 #include "native_client/src/include/nacl_base.h"
+#include "native_client/src/include/build_config.h"
 
 #if defined(__native_client__) || NACL_LINUX
 #include "native_client/src/include/gcc/atomic_ops.h"
 #elif NACL_OSX
 #include "native_client/src/include/osx/atomic_ops_osx.h"
 #elif NACL_WINDOWS
 #include "native_client/src/include/win/atomic_ops_win32.h"
 #else
 #error You need to implement atomic operations for this architecture
 #endif
@@ skipping 35 matching lines @@
 
 
 /*   Atomically increment *ptr by "increment".  Returns the new value of
  *   *ptr with the increment applied.  This routine implies no memory
  *   barriers.
  */
 static INLINE Atomic32
 AtomicIncrement(volatile Atomic32* ptr, Atomic32 increment);
 
 #endif  /* NATIVE_CLIENT_SRC_INCLUDE_ATOMIC_OPS_H_ */