53 lines
2.7 KiB
Text
53 lines
2.7 KiB
Text
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# Makefile to create the collatz programs. To use, type
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# > make
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# Which will create the collcalc program. Alternatively
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# > make collcalc
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# will also create the collcalc program.
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#
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# To create the test program and run it do
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# > make test
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#
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# Makefiles are divided into "rules" comprised of target,
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# dependencies, and commands to execute to finish the target.
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#
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# target : dependency1 dependency2
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# command1
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# command2
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# @command3 which is not printed
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# command4
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#
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# Some targets are files to create like the "collcalc" program or
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# "collatz_main.o" file. Other targets are "virtual" which simply
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# specify other targets to do or commands to run.
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CFLAGS = -Wall -g # variable holding options to the c compile
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CC = gcc $(CFLAGS) # variable holding the compilation command
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collcalc : collatz.o collatz_main.o collatz.h # collcalc is a program, depends on two files, is default target
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$(CC) -o collcalc collatz.o collatz_main.o # when the other files are ready, compile collcalc
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@echo collcalc is ready # issue a report that the program is ready
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collatz_main.o : collatz_main.c collatz.h # collatz_main.o depends on two source files
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$(CC) -c collatz_main.c # compile only, don't link yet
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collatz.o : collatz.c collatz.h # collatz.o depends on collatz.c and collatz.h
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$(CC) -c $< # compile, use shortcut $< which becomes "collatz.c"
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test : collatz_test # test is another target, depends on collatz_test program
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./collatz_test # when collatz_test exists, run it
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collatz_test : collatz_test.o collatz.o collatz.h # program depends on several object files and header
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$(CC) -o $@ $^ # compile using shortcuts: $@ becomes collatz_test, $^ is all dependecies
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collatz_test.o : collatz_test.c collatz.h # object file depends on C source and header
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$(CC) -c $< # compile to object code using shortcut, $< becomes "collatz_test.c"
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clean: # No dependencies: clean is the de facto cleanup target
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@echo Cleaning up object files # Report what's happening
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rm -f *.o # Remove all the .o files which are likely no longer needed
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realclean:
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@echo Removing objects and programs # "realclean" often used to get rid of everything
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rm -f *.o collcalc collatz_test # remove .o and programs that have been built
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