PCH support on Solaris

[Eric Botcazou]

> I think we discussed this more in the PR and the suggestion was to use
> MAP_FIXED but to check that the area was safe to map into.  There's
> sample code in the PR, I think, but it really needs someone with a
> Solaris machine to do a proper patch using host-hooks.

This particular PR contains no discussion and no sample code. And I didn't 
find anything either in the other 6 PCH-related PRs reported by GNATS.

Could you point me to the discussion you are speaking of?

-- 
Eric Botcazou