If you want to run or update a task when certain files are updated the make utility can come in handy. When you run the command make in the same directory where the makefile is located it compiles the file in the same order mentioned in the makefile rule.

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How to create and run simple makefile.

How to run a makefile. Go to the install folder. Download make from sourceforge. Make when run this way gnu make looks for a file named gnumakefile makefile or makefile in that order.

The linux make utility works by reading and interpreting a makefile. Here is my quick and temporary way to run a makefile. The simplest use is to recompile every file that is out of date.

The rule says that the o file depends upon the c version of the file and the h files included in the deps macro. Hellomake c hellofunc c gcc o hellomake hellomake c hellofunc c i. Create a makefile listing the rules for building the executable the file should be named makefile or makefile.

You may have used make to compile a program from source code. Makefile 3 cc gcc cflags i. 9 how to run make.

Usually makefiles are written so that if you run make with no arguments it does just that. Then we define a rule that applies to all files ending in the o suffix. Save this file as makefile or makefile.

This addition first creates the macro deps which is the set of h files on which the c files depend. But you might want to update only some of the files. The make utility requires a file makefile or makefile which defines set of tasks to be executed.

Typically you run make by simply typing the following command at the shell prompt. This only has to be done once except when new modules are added to the program the makefile must be updated to add new module dependencies to existing rules and to add new rules to build. A makefile that says how to recompile a program can be used in more than one way.