I dont understand why John state its not possible to have such a setting
and provides an example where one mix cpp and java files in one project.
Given project B depending on A (regardless what it does java/cpp/ant
whatever). If project A prints an error I would like to stop at least
the ant builder.
Maybe it is possible to have a property passed down to the ant script so
we can implement it there (e.g. task unless="project_has_errors")
Property "project_has_errors" should be set if A or B has errors printed
to the problems tab.