[Bug ada/77986] New: Re-building from the toplevel doesn't work when Ada changes

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77986

            Bug ID: 77986
           Summary: Re-building from the toplevel doesn't work when Ada
                    changes
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

After updating the source tree a

> make

in the toplevel in a configured and built tree with --disable-bootstrap doesn't
work.  The build always complains about RTS files needing a re-compile.  Well,
the _do it_.  It looks there are no kind of dependencies set up or makefile
rules that would look at changed sources?

This makes updating a dev tree with ada nearly impossible.