To prepare to use
make, you must write a file called
the makefile that describes the relationships among files
in your program and provides commands for updating each file.
In a program, typically, the executable file is updated from object
files, which are in turn made by compiling source files.
Once a suitable makefile exists, each time you change some source files, this simple shell command:
suffices to perform all necessary recompilations. The
uses the makefile data base and the last-modification times of the files to
decide which of the files need to be updated. For each of those files, it
issues the recipes recorded in the data base.
You can provide command line arguments to
make to control which
files should be recompiled, or how. See How to Run