Multiple source files must also be separated by a space.ĭEPENDENCY LINE: TARGET FILES : SOURCE FILESĪfter the makefile has been created, a program can be (re)compiled by typing make in the correct directory. Multiple target files must be separated by a space. It is called a dependency line because the first part depends on the second part. The first part (before the colon) are target files and the second part (after the colon) are called source files. The dependency line is made of two parts. The action line(s) must be indented with a tab.
The first line is called a dependency line and the subsequent line(s) are called actions or commands. The rules, which must begin in column 1, are in two parts. Most times, these rules are commands to compile(or recompile) a series of files. These rules tell the system what commands you want to be executed. A makefile that works well in one shell may not execute properly in another shell. Without a makefile, this is an extremely time-consuming task.Īs a makefile is a list of shell commands, it must be written for the shell which will process the makefile. If you have a large program with many source and/or header files, when you change a file on which others depend, you must recompile all the dependent files. Make keeps track of the last time files (normally object files) were updated and only updates those files which are required (ones containing changes) to keep the sourcefile up-to-date. If you create more than one makefile, be certain you are in the correct directory before typing make. While in the directory containing this makefile, you will type make and the commands in the makefile will be executed. A makefile is a special file, containing shell commands, that you create and name makefile (or Makefile depending upon the system). Make is Unix utility that is designed to start execution of a makefile. Makefile Tutorial - What is a Makefile? What is a Makefile?
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