example of Makefile to compile a c source file

example of Makefile to compile a c source file

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modify_time: modify_time.o
        gcc -o modify_time modify_time.o
modify_time.o: modify_time.c      # the prerequisite 'modify_time.c' CAN'T be omited!!!!! otherwise although modify_time.c modified, it will still prompt 'target is up-to-date' and the modification can't be compiled.
        gcc -c modify_time.c
clean:
        rm -rf *.o modify_time

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the below two lines in this Makefile can be omited:

modification can't be compiled.
        gcc -c modify_time.c

在‘跟我一起写Makefile’中有一个Makefile编译多个c文件的例子。