Rest of trivial decorations

[Jan Hubicka]

> Jan Hubicka wrote:
> > Hi,
> > this patch adds trivial decorations found across the library.  There are couple
> > things I broke out but in general this should be it.
> >
> > Tested on x86_64-linux, OK?
> >   
> Ok, thanks. Make sure to not exceed 80 columns in the ChangeLog entries,
> please.
Thanks,
I however noticed one problem here.  stdatomic.h can be included by C
code too.  Does something like this look sane?  Or do we want to invent
macro for throw() marker?
I think stdatomic.h is only case, other c headers contains to
functions.

Index: stdatomic.h
===================================================================
--- stdatomic.h	(revision 146314)
+++ stdatomic.h	(working copy)
@@ -119,26 +119,38 @@
 
   typedef atomic_long 		atomic_ptrdiff_t;
 
+#if __cplusplus
   // Accessor functions for base atomic_flag type.
   bool 
+  atomic_flag_test_and_set_explicit(volatile __atomic_flag_base*, memory_order) throw ();
+  
+  void 
+  atomic_flag_clear_explicit(volatile __atomic_flag_base*, memory_order) throw ();
+
+  void 
+  __atomic_flag_wait_explicit(volatile __atomic_flag_base*, memory_order) throw ();
+#else
+  // Accessor functions for base atomic_flag type.
+  bool 
   atomic_flag_test_and_set_explicit(volatile __atomic_flag_base*, memory_order);
+  
+  void 
+  atomic_flag_clear_explicit(volatile __atomic_flag_base*, memory_order);
 
+  void 
+  __atomic_flag_wait_explicit(volatile __atomic_flag_base*, memory_order);
+#endif
+
   inline bool 
   atomic_flag_test_and_set(volatile __atomic_flag_base* __a)
   { return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); }
-  
-  void 
-  atomic_flag_clear_explicit(volatile __atomic_flag_base*, memory_order);
 
   inline void 
   atomic_flag_clear(volatile __atomic_flag_base* __a)
   { atomic_flag_clear_explicit(__a, memory_order_seq_cst); }
-
-  void 
-  __atomic_flag_wait_explicit(volatile __atomic_flag_base*, memory_order);
   
-  volatile __atomic_flag_base* 
-  __atomic_flag_for_address(const volatile void* __z) __attribute__((const));
+  _GLIBCXX_CONST volatile __atomic_flag_base* 
+  __atomic_flag_for_address(const volatile void* __z) throw ();
 
   // Implementation specific defines.
 #define _ATOMIC_LOAD_(__a, __x)						\