Status and rationale for toplevel bootstrap (was Re: Example of debugging GCC with toplevel bootstrap)

[Paolo Bonzini]

Eric Botcazou wrote:
>>Then I'm confused: I thought the whole point of --disable-bootstrap is
>>to keep the old mechanism instead of getting the new one.
> 
> 
> Not quite.  You can do an old-style build and an old-style bootstrap from the 
> *toplevel* directory with --disable-bootstrap by issuing "make" and "make 
> bootstrap" respectively, that's all (and sufficient as far as I'm concerned).  

Not quite.  For now, you can do an old-style build and an old-style 
bootstrap from any directory with --disable-bootstrap, with the commands 
you mentioned.

In the future, you will still be able to do an old-style build with 
"--disable-bootstrap" (nobody ever wanted to prevent that).  But you 
will not be able to do an old-style bootstrap because the relevant 
Makefile rules will be removed.

Paolo