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    <p>First problem:</p> <pre><code>COMP = compose ${COMP}.o: ... </code></pre> <p>Adding a suffix to a variable isn't quite that simple in Make. And in this case you have some whitespace problems, which is why you're getting the warning messages, and why you couldn't build <code>compose</code> even if you tried.</p> <p>Since you're a beginner, let's take a simple approach, crude but effective. We'll rewrite those rules, and add one at the top so that you can build both files with <code>make</code>:</p> <pre><code>all: alphamask compose alphamask: alphamask.o ${CC} ${LFLAGS} -o alphamask alphamask.o ${LDFLAGS} alphamask.o: alphamask.cpp ${CC} ${CFLAGS} -c alphamask.cpp compose: compose.o ${CC} ${LFLAGS} -o compose compose.o ${LDFLAGS} compose.o: compose.cpp ${CC} ${CFLAGS} -c compose.cpp </code></pre> <p>After you've got this working perfectly, a lot of improvements are possible.</p> <p><b>EDIT:</b></p> <p>Now that it's working perfectly, we can improve it. First let's put in automatic variables, to reduce the redundancy: <code>$@</code> is the name of the target, <code>$^</code> is the prerequisites, and <code>$&lt;</code> is the first prerequisite.</p> <pre><code>all: alphamask compose alphamask: alphamask.o ${CC} ${LFLAGS} -o $@ $^ ${LDFLAGS} alphamask.o: alphamask.cpp ${CC} ${CFLAGS} -c $&lt; compose: compose.o ${CC} ${LFLAGS} -o $@ $^ ${LDFLAGS} compose.o: compose.cpp ${CC} ${CFLAGS} -c $&lt; </code></pre> <p>Now we see redundancy in the commands, so we can combine the rules:</p> <pre><code>all: alphamask compose alphamask: alphamask.o compose: compose.o alphamask compose: ${CC} ${LFLAGS} -o $@ $^ ${LDFLAGS} alphamask.o: alphamask.cpp compose.o: compose.cpp alphamask.o compose.o: ${CC} ${CFLAGS} -c $&lt; </code></pre> <p>Now we can replace the object (<code>.o</code>) rules with a pattern rule:</p> <pre><code>all: alphamask compose alphamask: alphamask.o compose: compose.o alphamask compose: ${CC} ${LFLAGS} -o $@ $^ ${LDFLAGS} %.o: %.cpp ${CC} ${CFLAGS} -c $&lt; </code></pre> <p>And a static pattern rule for the executables. (We could use a pattern rule for these too, but that would be a little too general.)</p> <pre><code>EXECUTABLES = alphamask compose .PHONY: all all: $(EXECUTABLES) $(EXECUTABLES): % : %.o ${CC} ${LFLAGS} -o $@ $^ ${LDFLAGS} %.o: %.cpp ${CC} ${CFLAGS} -c $&lt; </code></pre> <p>When you make these improvements, <b>get each improvement working perfectly before you advance to the next.</b></p>
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    1. COtyler@Tyler-Satellite-A665:~/Desktop/404/assignment4$ make Makefile:18: *** missing separator. Stop. I get this error
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    2. COAlso what types of improvements do you suggest?
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    3. CO@user1210093: Line 18 is `all: alphamask compose`, is that right?
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