[PATCH 2/5] Move _obstack_compat out of common

[Ondřej Bílka]

On Mon, May 13, 2013 at 08:36:09AM -0700, Peter Collingbourne wrote:
> It is impossible to create an alias of a common symbol (as
> compat_symbol does), because common symbols do not have a section or
> an offset until linked.  GNU as tolerates aliases of common symbols by
> simply creating another common symbol, but other assemblers (notably
> LLVM's integrated assembler) are less tolerant.
> 
>  /* A looong time ago (before 1994, anyway; we're not sure) this global variable
>     was used by non-GNU-C macros to avoid multiple evaluation.  The GNU C
>     library still exports it because somebody might use it.  */
That I call compatibility :)
> -struct obstack *_obstack_compat;
> +struct obstack *_obstack_compat = 0;

OK for me.

Ondra