Variable scope and expansion timing

Choose when a Make variable expands and understand why included files share one parsed namespace.

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Follow the lessons that apply this concept, then inspect the repository at the exact commit behind each explanation.

Make Graph Foundation · commit 7bf2533Split Make into anchored modules

Make Graph Foundation · commit 6efe9dcName Make variables by owner

Entered Environment · commit 6cd3401Enter a repository-shaped shell

Entered Environment · commit 8f53b24Let shells own their prompts

Entered Environment · commit 9981476Carry the build graph through entered shells