Makefile

Makefile:
A file that instructs the program make how to compile and link a program.
描述了source 

make是一个命令工具，是一个解释makefile中指令的命令工具，一般来说，大多数的IDE都有这个命令，比如：Delphi的make，Visual C++的nmake，Linux下GNU的make。
A make program aids you in developing large programs by keeping track of which portions of the entire program have been changed, compiling only those parts of the program which have changed since the last compile.
如果任何source files被modified since last "make" of the program, the make utility will figure out exactly what needs to be recompiled and relinked, and do it. So it "makes" a new version of the executable file,doing only what work is needed - it updates the executable automatically.