[CMake] How can I run my excutable in build

[王东岳]

Well, I want to run an excutable when build like the following makefile:
2 : 2.cpp
    g++ 2.cpp -o 2

2.cpp : gen
    gen 2.txt -o 2.cpp

gen : gen.cpp
    g++ gen.cpp -o gen

So what should I do?
I just have learnt how to build a simple project,

-- 
清华大学计算机系
Tsinghua University CST
王东岳
Dongyue.Wang
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