Let's include that at the beginning of our makefile. We can override this behavior using a special phony target called. It is the responsibility of all to call other targets. Often called the default goal, this is the reason you will see all as the first target in most projects. That's because only the first target in the makefile is the default target. If we try to run make after the changes, only the target say_hello will be executed. Let's add a few more phony targets: generate and clean to the Makefile: "Hello "Creating empty text files." The output should display only this: $ make To suppress echoing the actual command, we need to start echo with "Hello World" Going back to the example above, when make was executed, the entire command echo "Hello World" was displayed, followed by actual command output. It is not necessary for the target to be a file it could be just a name for the recipe, as in our example. On the other hand, a prerequisite can also be a target that depends on other dependencies: final_target: sub_target final_target.c To summarize, below is the syntax of a typical rule: target: prerequisitesĪs an example, a target might be a binary file that depends on prerequisites (source files). The target, prerequisites, and recipes together make a rule. The recipe uses prerequisites to make a target. The command echo "Hello World" is called the recipe. For the sake of simplicity, we have not defined any prerequisites in this example. The prerequisites or dependencies follow the target. In the example above, say_hello behaves like a function name, as in any programming language. Now run the file by typing make inside the directory myproject. Create a empty directory myproject containing a file Makefile with this content: say_hello: Let's start by printing the classic "Hello World" on the terminal. Before you start, ensure that make is installed in your system. In this article, we'll explore make and Makefile using basic and advanced examples. Most open source projects use make to compile a final executable binary, which can then be installed using make install. You may have used make to compile a program from source code. The make utility requires a file, Makefile (or makefile), which defines set of tasks to be executed. If you want to run or update a task when certain files are updated, the make utility can come in handy.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |