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# How to Run `make`

A makefile that says how to recompile a program can be used in more than one way. The simplest use is to recompile every file that is out of date. Usually, makefiles are written so that if you run `make` with no arguments, it does just that.

But you might want to update only some of the files; you might want to use a different compiler or different compiler options; you might want just to find out which files are out of date without changing them.

By giving arguments when you run `make`, you can do any of these things and many others.

The exit status of `make` is always one of three values:

`0`
  The exit status is zero if `make` is successful.
`2`
  The exit status is two if `make` encounters any errors. It will print messages describing the particular errors.
`1`
  The exit status is one if you use the ``-q'` flag and `make` determines that some target is not already up to date. See section Instead of Executing the Commands.

- Makefile Arguments: How to specify which makefile to use.
- Goals: How to use goal arguments to specify which parts of the makefile to use.
- Instead of Execution: How to use mode flags to specify what kind of thing to do with the commands in the makefile other than simply execute them.
- Avoiding Compilation: How to avoid recompiling certain files.
- Overriding: How to override a variable to specify an alternate compiler and other things.
- Testing: How to proceed past some errors, to test compilation.
- Options Summary: Summary of Options

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