April 2015
Intermediate to advanced
256 pages
5h 49m
English
Content preview from The GNU Make BookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 3. Building and Rebuilding
Knowing when and why targets are rebuilt and recipes run is fundamental to using GNU make. For simple makefiles, it’s easy to understand why a particular object file was built, but for real-world makefiles, building and rebuilding becomes complex. In addition, GNU make dependencies can be limiting because files are updated when the modification time of a prerequisite is later than the target. And in most cases, only a single target is updated by a single rule.
This chapter explains advanced techniques for handling dependencies in GNU make, including rebuilding when the recipe of a target changes, rebuilding when a checksum of a file changes, how best to implement recursive make, and how to build multiple targets ...
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