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

[Paolo Bonzini]

Richard Kenner wrote:

>    Then it seems to me that you are just relying on a peculiarity of the
>    Ada build system, that is the fact that you can work entirely from
>    within the GCC directory.
>
>That's by design, of course.
>  
>
Though it makes me wonder why people did not replicate the design for 
C++, Fortran (even old g77) and Java?

>    What you need to do then, is to run from the toplevel "make
>    stage3-bubble; make -C gcc gnatlib_and_tools".
>
>Does the latter differ from "cd gcc; make gnatlib_and_tools"?
>  
>
More like "(cd gcc; make gnatlib_and_tools)", i.e. the current directory 
is the same.

Paolo