说明：  本文介绍了Unix/Linux平台上如何编写Makefile来自动编译C/C++。一个工程中的源文件不计数，其按类型、功能、模块分别放在若干个目录中，makefile定义了一系列的规则来指定，哪些文件需要先编译，哪些文件需要后编译，哪些文件需要重新编译，甚至于进行更复杂的功能操作，因为 makefile就像一个Shell脚本一样，其中也可以执行操作系统的命令。
(This article describes the Unix/Linux platform, how to write a Makefile to automatically compile C/C++. A project in the source file does not count, its by type, function, modules are placed in several directories, makefile defines a series of rules to specify which files need to compile, after which files need to be compiled, which files need to re- compile, and even more complex functional operations, because the same makefile as a Shell script, which can also run operating system commands.)