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-  <h1 class="section">Variables Make Makefiles Simpler</h1>   <p>In our example, we had to list all the object files twice in the rule for <samp>edit</samp> (repeated here): </p> <div class="example"> <pre class="example">edit : main.o kbd.o command.o display.o \
-              insert.o search.o files.o utils.o
-        cc -o edit main.o kbd.o command.o display.o \
-                   insert.o search.o files.o utils.o
-</pre>
-</div>  <p>Such duplication is error-prone; if a new object file is added to the system, we might add it to one list and forget the other. We can eliminate the risk and simplify the makefile by using a variable. <em>Variables</em> allow a text string to be defined once and substituted in multiple places later (see <a href="using-variables">How to Use Variables</a>). </p>      <p>It is standard practice for every makefile to have a variable named <code>objects</code>, <code>OBJECTS</code>, <code>objs</code>, <code>OBJS</code>, <code>obj</code>, or <code>OBJ</code> which is a list of all object file names. We would define such a variable <code>objects</code> with a line like this in the makefile: </p> <div class="example"> <pre class="example">objects = main.o kbd.o command.o display.o \
-          insert.o search.o files.o utils.o
-</pre>
-</div> <p>Then, each place we want to put a list of the object file names, we can substitute the variable’s value by writing ‘<samp>$(objects)</samp>’ (see <a href="using-variables">How to Use Variables</a>). </p> <p>Here is how the complete simple makefile looks when you use a variable for the object files: </p> <div class="example"> <pre class="example">objects = main.o kbd.o command.o display.o \
-          insert.o search.o files.o utils.o
-
-edit : $(objects)
-        cc -o edit $(objects)
-main.o : main.c defs.h
-        cc -c main.c
-kbd.o : kbd.c defs.h command.h
-        cc -c kbd.c
-command.o : command.c defs.h command.h
-        cc -c command.c
-display.o : display.c defs.h buffer.h
-        cc -c display.c
-insert.o : insert.c defs.h buffer.h
-        cc -c insert.c
-search.o : search.c defs.h buffer.h
-        cc -c search.c
-files.o : files.c defs.h buffer.h command.h
-        cc -c files.c
-utils.o : utils.c defs.h
-        cc -c utils.c
-clean :
-        rm edit $(objects)
-</pre>
-</div><div class="_attribution">
-  <p class="_attribution-p">
-    Copyright © 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Free Software Foundation, Inc. <br>Licensed under the GNU Free Documentation License.<br>
-    <a href="https://www.gnu.org/software/make/manual/html_node/Variables-Simplify.html" class="_attribution-link">https://www.gnu.org/software/make/manual/html_node/Variables-Simplify.html</a>
-  </p>
-</div>