GCC 3.4.6 on Solaris: 'visibility' attribute does not supply to types

[Boris]

I'm trying to compile a project with GCC 3.4.6 on Solaris 10 which uses the 
visibility attribute here and there. While it all works without any problems 
on Linux I get the following warning on Solaris:

`visibility' attribute does not apply to types

Is this a warning I can safely ignore? It surprises me that although I'm 
using the same compiler version I get a warning on Solaris?

Boris