Bootstrapping Debian-based distributions for new architectures

" summary

Tools and techniques for automating bootstrapping a Debian-based distribution on a new CPU architecture, by cross-compiling a minimal build system and then breaking build-dependency cycles to enable native compilation of the rest. Covers the current implementation, the algorithms used to identify and resolve dependency cycles during cross- and native builds, and planned future work and gaps in Debian's packaging metadata that hinder bootstrapping.

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