make: Running
9 How to Run 'make'
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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 The simplest use is to recompile every file that is out of
date.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want just to find out which files are out of date without changing them.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.
Instead of Executing Recipes Instead of Execution.
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