Example of debugging GCC with toplevel bootstrap

[Paolo Bonzini]

Richard Kenner wrote:

>    As I said multiple times, *of course* bootstrapping will *never* be
>    mandatory.  On the other hand, GCC-only bootstrapping
>    (i.e. configuring with disabled bootstrap, and then typing "make
>    bootstrap") will be deleted.
>
>You've now heard *a lot* of people say that they don't want this deleted:
>that it's a useful test that they want to keep using.  Why do you propose
>to delete it given that?
>  
>
Who?  Most people I've read the messages of, believed that 
disable-bootstrap would have been deleted tout court, without providing 
a way of building a non-self-built GCC.

Anyway, let's suspend this discussion for a while until I've applied the 
patches that bring more similarity to the old system, e.g. PR 25670.

Paolo