6.1. Introduction
Chapter 6 begins the cross-compilation phase that produces a minimal working target system used as the base for chapters 7 and 8.
Chapter 5 established the compiler and runtime pieces needed to stop leaning on the host toolchain. Chapter 6 is where those pieces are used in earnest to assemble a minimal working system in the target tree.
This chapter is intentionally about minimum viable system behavior, not feature completeness. The objective is a small, coherent base that can boot into useful maintenance and build workflows, then serve as the platform for chapters 7 and 8.
What This Chapter Is Trying to Achieve
By the end of chapter 6, the target tree should contain enough core userland to support predictable operation and follow-on package work, including:
- essential runtime libraries and foundational tools in the intended layout;
- consistent target-side linkage against the cross-built stack from chapter 5;
- a stable baseline that later package groups can assume without restaging bootstrap pieces.
What This Chapter Is Not Trying to Do
Chapter 6 is not the place to chase polish, optional tooling, or every package someone on the internet once called “tiny but mandatory.” If a component is not required to establish the minimal working base for chapter 7 and chapter 8, it can wait.
In short: this chapter builds the floor, not the chandelier.
Why the Separation Matters for Chapters 7 and 8
Keeping chapter 6 focused on minimal system viability makes later chapters cleaner:
- chapter 7 will get us into a working shell with its own userland and LLVM toolchain, so we can build the full system from there.;
- chapter 8 will be the actual system building.
That separation reduces troubleshooting noise and makes regressions easier to localize when something inevitably gets creative at build time.