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This patch rewrites the Baserock morphologies so that they can be
built using a minimal "build-essential" staging filler, as described
in my previous patch mail.
The Baserock system is split up into three strata:
- build-essential: the minimum set of tools that can rebuild
itself (from tarballs)
- core: the remaining set of components necessary to produce
a Baserock system which can rebuild itself from source
- tools: auxiliary development tools and libraries
The 'build-essential' stratum does not specify any build
dependencies, because it expects to be built with a staging filler
containing itself. In effect, the stratum has a circular dependency
on itself, which we solve by using a staging filler. The 'core'
stratum depends on only on 'build-essential'. This ensures that all
build dependencies between chunks in 'core' are explicit. These
strata can also be built with the staging filler from the water-bomb
release.
The distinction between a base and a devel system is no longer
defined by the 'foundation' and 'devel' strata (in practice these
had various hidden build dependencies between each other). The size
of a base system is larger than before, due to more development tools
being in 'core'.
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