But what does it actually do? Here’s how it works. In the next few recipes, you’ll see that GNU make is a powerful tool for buildingĬomplex projects. Phony targets, using the PHONY attribute.įor example, to build an executable from the source code in Example 1-4 using GCC, your makefile might The clean and install targets should both be labeled as Its command script should remove the executable and the intermediate objectįile from the current directory. Prerequisites, and should have a command script to copy the executable from the directoryĬontaining the makefile to the directory where you want it installed. Specify yourĪpplication’s source file as its prerequisite, and specify the command line needed toīuild the executable from the source file as your target’s command script. Give the second target the same name as your executable. The name of the executable you wish to build as its sole prerequisite. Create a text file named makefile in the directory containing your source file. In the following examples, lines which begin with a Tab are indicated by an With a Tab rather than a Space - this is a source of some of the most common beginnerĮrrors.
Lines containing command scripts must begin
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