target_header_dir vs host-x-host

[Alan Modra]

On Fri, Mar 16, 2012 at 01:35:25PM -0400, DJ Delorie wrote:
> Maybe we should consider making sysroot *always* enabled, with a
> default of "/" then?

I don't oppose the idea, but default library search paths will change.
See genscripts.sh omission of tool_lib when use_sysroot, and before
you ask, I haven't done the archaeology to find out why.

-- 
Alan Modra
Australia Development Lab, IBM