proposed bootstrap changes

[Richard Earnshaw]

>     Here is my fixed rule (example).  Should this work OK?
> 
>     restage2:
> 	-test -d stage2/. && (cd stage2; tar -cf - .) | tar -xpf -
> 	-rm -rf stage2 stage3 stage4 stage2_build stage2_copy
> 	$(MAKE) LANGUAGES="$(LANGUAGES)" stage2_build
> 
> I don't like this because of the tar.  It means you potentially
> lose date information (I know you're not supposed to), but also run the
> risk of a disk filling since you have can have two copies for a while.
> 
> I'd prefer to run a loop that does recursive mv's.


	-for i in $(STAGESTUFF); do mv stage<N>/$i $i; done

followed by other rules that mirror the behaviour of the stageN rules.