gcc visibility used by moz

[Geoffrey Keating]

Tristan Wibberley <maihem@maihem.org> writes:

> The types are defined in headers and are thus known
> to exist - no visibility attributes will or should change that.

The question here is not whether the types exist, but which types are
the same as which other types.

I think that what you want is a model of visibility in which all types
are always visible.  Although abstractly such a model is possible, I
think it's less useful than the current model, because it makes it
hard to isolate shared libraries from each other.  It is certainly
possible to emulate such a model with the current GCC, if it's what
you want, by simply not marking types as hidden.