src/common/starpu_spinlock.c: mark attribute as potentially unused

src/common/starpu_spinlock.c

@@ -1,7 +1,7 @@
 /* StarPU --- Runtime system for heterogeneous multicore architectures.
  *
  * Copyright (C) 2010  Université de Bordeaux 1
- * Copyright (C) 2010  Centre National de la Recherche Scientifique
+ * Copyright (C) 2010, 2011  Centre National de la Recherche Scientifique
  *
  * StarPU is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by
@@ -101,7 +101,7 @@ int _starpu_spin_trylock(starpu_spinlock_t *lock)
 #endif
 }
 
-int _starpu_spin_unlock(starpu_spinlock_t *lock)
+int _starpu_spin_unlock(starpu_spinlock_t *lock __attribute__((unused)))
 {
 #ifdef STARPU_SPINLOCK_CHECK
 	int ret = pthread_mutex_unlock(&lock->errcheck_lock);