Another patch for visibility.

[Martin von Loewis]

> I've sent initial patch to gcc-patches@gnu.gcc.org, and now trying to 
> implement:
> 
> 	__attribute__ ((visibility(internal)))
> 	__attribute__ ((visibility(hidden)))
> 	__attribute__ ((visibility(protected)))
> 
> Any comments are appriciated.

My comment: This is a very good idea, and the obvious user interface
to the feature.

Regards,
Martin