How Xcode Structures a Build
A makefile is organized around a hierarchy of goals. Some goals, such as the frequently used clean or install targets, are abstract, but most are files. Associated with each goal is a list of other goals that are antecedents—dependencies—of that goal and a script for turning the antecedents into something that satisfies the goal. Most commonly, the antecedents are input files for the programs that the script runs to produce a target file. The genius of make comes from the rule that if any target is more recently modified than all of its antecedents, it is presumed to embody their current state, and it is not necessary to run the script to produce it again. The combination of a tree of dependencies and this pruning ...
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