Simon Burge <simonb@telstra.com.au> writes:

> 
> While talking about config(8), is it worth thinking about keeping
> config(8) in /usr/src/sys somewhere?
> 
> When the config file format changes in any way, you can no longer use
> /usr/sbin/config to configure a new kernel, and similary you can't
> build a kernel from an older src tree if /usr/sbin/config has been
> updated to understand a newer config file format.

Really, the preferred solution here is to just avoid needing to change
config(8) often.  It's true that the switch to config.new(8), and then
the cf_attach changes, caused incompatibilities.  However, all of the
changes I've proposed are backward compatible (or at least *can* be,
if we leave default `S?=' lines in the Makefiles) with 1.2.