Add support for sparc-wrs-vxworks

[Eric Botcazou]

> 	* config/sparc/sparc.h: Include vxworks-dummy.h.

<grumble>
I see that it's the same for other archs, but this is *really* not pretty:
 1. The preferred mechanism for target includes is tm_file in config.gcc.
 2. This sets a bad precedent for future ports.
</grumble>

> +/* Emit a PARALLEL call instruction with the contents given by VEC.
> +   MEM is the memory reference associated with the call target.  */
> +
> +void
> +sparc_emit_call_insn (rtvec vec, rtx mem)
> +{
> +  rtx x, insn;
> +
> +  insn = emit_call_insn (gen_rtx_PARALLEL (VOIDmode, vec));
> +  gcc_assert (MEM_P (mem));
> +  if (TARGET_VXWORKS_RTP && flag_pic)
> +    {
> +      /* The PIC register is live on entry to VxWorks PIC PLT entries.  */
> +      x = XEXP (mem, 0);

Please change the prototype of sparc_emit_call_insn to make it ressemble that 
of emit_call_insn.  And remove the gcc_assert (and merge it with the existing 
gcc_assert in the call and call_value patterns).

> +   VxWorks PIC PLT entries require the global pointer to be initialized
> +   on entry.  We therefore can't emit sibling calls to them.  */
>  static bool
>  sparc_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
>  {
>    return (decl
>  	  && flag_delayed_branch
> -	  && (TARGET_ARCH64 || ! current_function_returns_struct));
> +	  && (TARGET_ARCH64 || ! current_function_returns_struct)
> +	  && (!TARGET_VXWORKS_RTP
> +	      || !flag_pic
> +	      || targetm.binds_local_p (decl)));
>  }

&& !(TARGET_VXWORKS_RTP
     && flag_pic
     && !targetm.binds_local_p (decl))

OK with these changes.

-- 
Eric Botcazou