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 5. Pushing the Envelope
In this chapter, you’ll find techniques that you usually won’t need but can, from time to time, be very useful. For example, sometimes it’s useful to extend GNU make’s language by creating new functions in C or even Guile. This chapter shows how to do that and more.
Doing Arithmetic
GNU make has no built-in arithmetic capability. But it is possible to create functions for addition, subtraction, multiplication, and division of integers. You can also create functions for integer comparisons, such as greater than or not equal. These functions are implemented entirely using GNU make’s built-in list and string manipulation functions: $(subst), $(filter), $(filter-out), $(words), $(wordlist), $(call), $(foreach), and
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.